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libvirt/docs/manpages/virsh.rst
Tim Wiederhake 4bd0633211 docs: Expand on recommendation in hypervisor-cpu-baseline description 
On some architectures, e.g. aarch64 and s390x, the output of
`virsh capabilities` is not suitable for use in
`virsh hypervisor-cpu-baseline`. Expand the description of the
man page to make this explicit.

https://bugzilla.redhat.com/show_bug.cgi?id=1850654

Signed-off-by: Tim Wiederhake <twiederh@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
2020-10-15 11:39:17 +02:00

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=====
virsh
=====
-------------------------
management user interface
-------------------------
:Manual section: 1
:Manual group: Virtualization Support
.. contents:: :depth: 2
SYNOPSIS
========
``virsh`` [*OPTION*]... [*COMMAND_STRING*]
``virsh`` [*OPTION*]... *COMMAND* [*ARG*]...
DESCRIPTION
===========
The ``virsh`` program is the main interface for managing virsh guest
domains. The program can be used to create, pause, and shutdown
domains. It can also be used to list current domains. Libvirt is a C
toolkit to interact with the virtualization capabilities of recent
versions of Linux (and other OSes). It is free software available
under the GNU Lesser General Public License. Virtualization of the
Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the
basic resources are driven by a Linux instance. The library aims at
providing a long term stable C API. It currently supports Xen, QEMU,
KVM, LXC, OpenVZ, VirtualBox and VMware ESX.
The basic structure of most virsh usage is:
::
virsh [OPTION]... <command> <domain> [ARG]...
Where *command* is one of the commands listed below; *domain* is the
numeric domain id, or the domain name, or the domain UUID; and *ARGS*
are command specific options. There are a few exceptions to this rule
in the cases where the command in question acts on all domains, the
entire machine, or directly on the xen hypervisor. Those exceptions
will be clear for each of those commands. Note: it is permissible to
give numeric names to domains, however, doing so will result in a
domain that can only be identified by domain id. In other words, if a
numeric value is supplied it will be interpreted as a domain id, not
as a name. Any *command* starting with ``#`` is treated as a comment
and silently ignored, all other unrecognized *commands* are diagnosed.
The ``virsh`` program can be used either to run one *COMMAND* by giving the
command and its arguments on the shell command line, or a *COMMAND_STRING*
which is a single shell argument consisting of multiple *COMMAND* actions
and their arguments joined with whitespace and separated by semicolons or
newlines between commands, where unquoted backslash-newline pairs are
elided. Within *COMMAND_STRING*, virsh understands the
same single, double, and backslash escapes as the shell, although you must
add another layer of shell escaping in creating the single shell argument,
and any word starting with unquoted *#* begins a comment that ends at newline.
If no command is given in the command line, ``virsh`` will then start a minimal
interpreter waiting for your commands, and the ``quit`` command will then exit
the program.
The ``virsh`` program understands the following *OPTIONS*.
``-c``, ``--connect`` *URI*
Connect to the specified *URI*, as if by the ``connect`` command,
instead of the default connection.
``-d``, ``--debug`` *LEVEL*
Enable debug messages at integer *LEVEL* and above. *LEVEL* can
range from 0 to 4 (default). See the documentation of ``VIRSH_DEBUG``
environment variable below for the description of each *LEVEL*.
- ``-e``, ``--escape`` *string*
Set alternative escape sequence for *console* command. By default,
telnet's ``^]`` is used. Allowed characters when using hat notation are:
alphabetic character, @, [, ], \, ^, _.
- ``-h``, ``--help``
Ignore all other arguments, and behave as if the ``help`` command were
given instead.
- ``-k``, ``--keepalive-interval`` *INTERVAL*
Set an *INTERVAL* (in seconds) for sending keepalive messages to
check whether connection to the server is still alive. Setting the
interval to 0 disables client keepalive mechanism.
- ``-K``, ``--keepalive-count`` *COUNT*
Set a number of times keepalive message can be sent without getting an
answer from the server without marking the connection dead. There is
no effect to this setting in case the *INTERVAL* is set to 0.
- ``-l``, ``--log`` *FILE*
Output logging details to *FILE*.
- ``-q``, ``--quiet``
Avoid extra informational messages.
- ``-r``, ``--readonly``
Make the initial connection read-only, as if by the *--readonly*
option of the ``connect`` command.
- ``-t``, ``--timing``
Output elapsed time information for each command.
- ``-v``, ``--version[=short]``
Ignore all other arguments, and prints the version of the libvirt library
virsh is coming from
- ``-V``, ``--version=long``
Ignore all other arguments, and prints the version of the libvirt library
virsh is coming from and which options and driver are compiled in.
NOTES
=====
Most ``virsh`` operations rely upon the libvirt library being able to
connect to an already running libvirtd service. This can usually be
done using the command ``service libvirtd start``.
Most ``virsh`` commands require root privileges to run due to the
communications channels used to talk to the hypervisor. Running as
non root will return an error.
Most ``virsh`` commands act synchronously, except maybe shutdown,
setvcpus and setmem. In those cases the fact that the ``virsh``
program returned, may not mean the action is complete and you
must poll periodically to detect that the guest completed the
operation.
``virsh`` strives for backward compatibility. Although the ``help``
command only lists the preferred usage of a command, if an older
version of ``virsh`` supported an alternate spelling of a command or
option (such as *--tunnelled* instead of *--tunneled*), then
scripts using that older spelling will continue to work.
Several ``virsh`` commands take an optionally scaled integer; if no
scale is provided, then the default is listed in the command (for
historical reasons, some commands default to bytes, while other
commands default to kibibytes). The following case-insensitive
suffixes can be used to select a specific scale:
::
b, byte byte 1
KB kilobyte 1,000
k, KiB kibibyte 1,024
MB megabyte 1,000,000
M, MiB mebibyte 1,048,576
GB gigabyte 1,000,000,000
G, GiB gibibyte 1,073,741,824
TB terabyte 1,000,000,000,000
T, TiB tebibyte 1,099,511,627,776
PB petabyte 1,000,000,000,000,000
P, PiB pebibyte 1,125,899,906,842,624
EB exabyte 1,000,000,000,000,000,000
E, EiB exbibyte 1,152,921,504,606,846,976
GENERIC COMMANDS
================
The following commands are generic i.e. not specific to a domain.
help
----
**Syntax:**
::
help [command-or-group]
This lists each of the virsh commands. When used without options, all
commands are listed, one per line, grouped into related categories,
displaying the keyword for each group.
To display only commands for a specific group, give the keyword for that
group as an option. For example:
**Example 1:**
::
virsh # help host
Host and Hypervisor (help keyword 'host'):
capabilities capabilities
cpu-models show the CPU models for an architecture
connect (re)connect to hypervisor
freecell NUMA free memory
hostname print the hypervisor hostname
qemu-attach Attach to existing QEMU process
qemu-monitor-command QEMU Monitor Command
qemu-agent-command QEMU Guest Agent Command
sysinfo print the hypervisor sysinfo
uri print the hypervisor canonical URI
To display detailed information for a specific command, give its name as the
option instead. For example:
**Example 2:**
::
virsh # help list
NAME
list - list domains
SYNOPSIS
list [--inactive] [--all]
DESCRIPTION
Returns list of domains.
OPTIONS
--inactive list inactive domains
--all list inactive & active domains
quit, exit
----------
**Syntax:**
::
quit
exit
quit this interactive terminal
version
-------
**Syntax:**
::
version [--daemon]
Will print out the major version info about what this built from.
If *--daemon* is specified then the version of the libvirt daemon
is included in the output.
**Example:**
::
$ virsh version
Compiled against library: libvirt 1.2.3
Using library: libvirt 1.2.3
Using API: QEMU 1.2.3
Running hypervisor: QEMU 2.0.50
$ virsh version --daemon
Compiled against library: libvirt 1.2.3
Using library: libvirt 1.2.3
Using API: QEMU 1.2.3
Running hypervisor: QEMU 2.0.50
Running against daemon: 1.2.6
cd
--
**Syntax:**
::
cd [directory]
Will change current directory to *directory*. The default directory
for the ``cd`` command is the home directory or, if there is no *HOME*
variable in the environment, the root directory.
This command is only available in interactive mode.
pwd
---
**Syntax:**
::
pwd
Will print the current directory.
connect
-------
**Syntax:**
::
connect [URI] [--readonly]
(Re)-Connect to the hypervisor. When the shell is first started, this
is automatically run with the *URI* parameter requested by the ``-c``
option on the command line. The *URI* parameter specifies how to
connect to the hypervisor. The URI docs
`https://libvirt.org/uri.html <https://libvirt.org/uri.html>`__ list the
values supported, but the most common are:
- xen:///system
this is used to connect to the local Xen hypervisor
- qemu:///system
connect locally as root to the daemon supervising QEMU and KVM domains
- qemu:///session
connect locally as a normal user to his own set of QEMU and KVM domains
- lxc:///system
connect to a local linux container
To find the currently used URI, check the *uri* command documented below.
For remote access see the URI docs
`https://libvirt.org/uri.html <https://libvirt.org/uri.html>`__ on how
to make URIs. The *--readonly* option allows for read-only connection
uri
---
**Syntax:**
::
uri
Prints the hypervisor canonical URI, can be useful in shell mode.
hostname
--------
**Syntax:**
::
hostname
Print the hypervisor hostname.
sysinfo
-------
**Syntax:**
::
sysinfo
Print the XML representation of the hypervisor sysinfo, if available.
nodeinfo
--------
**Syntax:**
::
nodeinfo
Returns basic information about the node, like number and type of CPU,
and size of the physical memory. The output corresponds to virNodeInfo
structure. Specifically, the "CPU socket(s)" field means number of CPU
sockets per NUMA cell. The information libvirt displays is dependent
upon what each architecture may provide.
nodecpumap
----------
**Syntax:**
::
nodecpumap [--pretty]
Displays the node's total number of CPUs, the number of online CPUs
and the list of online CPUs.
With *--pretty* the online CPUs are printed as a range instead of a list.
nodecpustats
------------
**Syntax:**
::
nodecpustats [cpu] [--percent]
Returns cpu stats of the node.
If *cpu* is specified, this will print the specified cpu statistics only.
If *--percent* is specified, this will print the percentage of each kind
of cpu statistics during 1 second.
nodememstats
------------
**Syntax:**
::
nodememstats [cell]
Returns memory stats of the node.
If *cell* is specified, this will print the specified cell statistics only.
nodesuspend
-----------
**Syntax:**
::
nodesuspend [target] [duration]
Puts the node (host machine) into a system-wide sleep state and schedule
the node's Real-Time-Clock interrupt to resume the node after the time
duration specified by *duration* is out.
*target* specifies the state to which the host will be suspended to, it
can be "mem" (suspend to RAM), "disk" (suspend to disk), or "hybrid"
(suspend to both RAM and disk). *duration* specifies the time duration
in seconds for which the host has to be suspended, it should be at least
60 seconds.
node-memory-tune
----------------
**Syntax:**
::
node-memory-tune [shm-pages-to-scan] [shm-sleep-millisecs] [shm-merge-across-nodes]
Allows you to display or set the node memory parameters.
*shm-pages-to-scan* can be used to set the number of pages to scan
before the shared memory service goes to sleep; *shm-sleep-millisecs*
can be used to set the number of millisecs the shared memory service should
sleep before next scan; *shm-merge-across-nodes* specifies if pages from
different numa nodes can be merged. When set to 0, only pages which physically
reside in the memory area of same NUMA node can be merged. When set to 1,
pages from all nodes can be merged. Default to 1.
``Note``: Currently the "shared memory service" only means KSM (Kernel Samepage
Merging).
capabilities
------------
**Syntax:**
::
capabilities
Print an XML document describing the capabilities of the hypervisor
we are currently connected to. This includes a section on the host
capabilities in terms of CPU and features, and a set of description
for each kind of guest which can be virtualized. For a more complete
description see:
`https://libvirt.org/formatcaps.html <https://libvirt.org/formatcaps.html>`_
The XML also show the NUMA topology information if available.
domcapabilities
---------------
**Syntax:**
::
domcapabilities [virttype] [emulatorbin] [arch] [machine]
Print an XML document describing the domain capabilities for the
hypervisor we are connected to using information either sourced from an
existing domain or taken from the ``virsh capabilities`` output. This may
be useful if you intend to create a new domain and are curious if for
instance it could make use of VFIO by creating a domain for the
hypervisor with a specific emulator and architecture.
Each hypervisor will have different requirements regarding which options
are required and which are optional. A hypervisor can support providing
a default value for any of the options.
The *virttype* option specifies the virtualization type used. The value
to be used is either from the 'type' attribute of the <domain/> top
level element from the domain XML or the 'type' attribute found within
each <guest/> element from the ``virsh capabilities`` output. The
*emulatorbin* option specifies the path to the emulator. The value to
be used is either the <emulator> element in the domain XML or the
``virsh capabilities`` output. The *arch* option specifies the
architecture to be used for the domain. The value to be used is either
the "arch" attribute from the domain's XML <os/> element and <type/>
subelement or the "name" attribute of an <arch/> element from the
``virsh capabililites`` output. The *machine* specifies the machine type
for the emulator. The value to be used is either the "machine" attribute
from the domain's XML <os/> element and <type/> subelement or one from a
list of machines from the ``virsh capabilities`` output for a specific
architecture and domain type.
For the QEMU hypervisor, a *virttype* of either 'qemu' or 'kvm' must be
supplied along with either the *emulatorbin* or *arch* in order to
generate output for the default *machine*. Supplying a *machine*
value will generate output for the specific machine.
pool-capabilities
-----------------
**Syntax:**
::
pool-capabilities
Print an XML document describing the storage pool capabilities for the
connected storage driver. This may be useful if you intend to create a
new storage pool and need to know the available pool types and supported
storage pool source and target volume formats as well as the required
source elements to create the pool.
inject-nmi
----------
**Syntax:**
::
inject-nmi domain
Inject NMI to the guest.
list
----
**Syntax:**
::
list [--inactive | --all]
[--managed-save] [--title]
{ [--table] | --name | --uuid }
[--persistent] [--transient]
[--with-managed-save] [--without-managed-save]
[--autostart] [--no-autostart]
[--with-snapshot] [--without-snapshot]
[--with-checkpoint] [--without-checkpoint]
[--state-running] [--state-paused]
[--state-shutoff] [--state-other]
Prints information about existing domains. If no options are
specified it prints out information about running domains.
**Example 1:**
An example format for the list is as follows:
::
``virsh`` list
Id Name State
----------------------------------------------------
0 Domain-0 running
2 fedora paused
Name is the name of the domain. ID the domain numeric id.
State is the run state (see below).
**STATES**
The State field lists what state each domain is currently in. A domain
can be in one of the following possible states:
- ``running``
The domain is currently running on a CPU
- ``idle``
The domain is idle, and not running or runnable. This can be caused
because the domain is waiting on IO (a traditional wait state) or has
gone to sleep because there was nothing else for it to do.
- ``paused``
The domain has been paused, usually occurring through the administrator
running ``virsh suspend``. When in a paused state the domain will still
consume allocated resources like memory, but will not be eligible for
scheduling by the hypervisor.
- ``in shutdown``
The domain is in the process of shutting down, i.e. the guest operating system
has been notified and should be in the process of stopping its operations
gracefully.
- ``shut off``
The domain is not running. Usually this indicates the domain has been
shut down completely, or has not been started.
- ``crashed``
The domain has crashed, which is always a violent ending. Usually
this state can only occur if the domain has been configured not to
restart on crash.
- ``pmsuspended``
The domain has been suspended by guest power management, e.g. entered
into s3 state.
Normally only active domains are listed. To list inactive domains specify
*--inactive* or *--all* to list both active and inactive domains.
**Filtering**
To further filter the list of domains you may specify one or more of filtering
flags supported by the ``list`` command. These flags are grouped by function.
Specifying one or more flags from a group enables the filter group. Note that
some combinations of flags may yield no results. Supported filtering flags and
groups:
Persistence
...........
Flag *--persistent* is used to include persistent guests in the returned
list. To include transient guests specify *--transient*.
Existence of managed save image
...............................
To list domains having a managed save image specify flag
*--with-managed-save*. For domains that don't have a managed save image
specify *--without-managed-save*.
Domain state
............
The following filter flags select a domain by its state:
*--state-running* for running domains, *--state-paused* for paused domains,
*--state-shutoff* for turned off domains and *--state-other* for all
other states as a fallback.
Autostarting domains
....................
To list autostarting domains use the flag *--autostart*. To list domains with
this feature disabled use *--no-autostart*.
Snapshot existence
..................
Domains that have snapshot images can be listed using flag *--with-snapshot*,
domains without a snapshot *--without-snapshot*.
Checkpoint existence
....................
Domains that have checkpoints can be listed using flag *--with-checkpoint*,
domains without a checkpoint *--without-checkpoint*.
When talking to older servers, this command is forced to use a series of API
calls with an inherent race, where a domain might not be listed or might appear
more than once if it changed state between calls while the list was being
collected. Newer servers do not have this problem.
If *--managed-save* is specified, then domains that have managed save state
(only possible if they are in the ``shut off`` state, so you need to specify
*--inactive* or *--all* to actually list them) will instead show as ``saved``
in the listing. This flag is usable only with the default *--table* output.
Note that this flag does not filter the list of domains.
If *--name* is specified, domain names are printed instead of the table
formatted one per line. If *--uuid* is specified domain's UUID's are printed
instead of names. Flag *--table* specifies that the legacy table-formatted
output should be used. This is the default.
If both *--name* and *--uuid* are specified, domain UUID's and names
are printed side by side without any header. Flag *--table* specifies
that the legacy table-formatted output should be used. This is the
default if neither *--name* nor *--uuid* are specified. Option
*--table* is mutually exclusive with options *--uuid* and *--name*.
If *--title* is specified, then the short domain description (title) is
printed in an extra column. This flag is usable only with the default
*--table* output.
**Example 2:**
::
$ virsh list --title
Id Name State Title
-------------------------------------------
0 Domain-0 running Mailserver 1
2 fedora paused
freecell
--------
**Syntax:**
::
freecell [{ [--cellno] cellno | --all }]
Prints the available amount of memory on the machine or within a NUMA
cell. The freecell command can provide one of three different
displays of available memory on the machine depending on the options
specified. With no options, it displays the total free memory on the
machine. With the --all option, it displays the free memory in each
cell and the total free memory on the machine. Finally, with a
numeric argument or with --cellno plus a cell number it will display
the free memory for the specified cell only.
freepages
---------
**Syntax:**
::
freepages [{ [--cellno] cellno [--pagesize] pagesize | --all }]
Prints the available amount of pages within a NUMA cell. *cellno* refers
to the NUMA cell you're interested in. *pagesize* is a scaled integer (see
``NOTES`` above). Alternatively, if *--all* is used, info on each possible
combination of NUMA cell and page size is printed out.
allocpages
----------
**Syntax:**
::
allocpages [--pagesize] pagesize [--pagecount] pagecount [[--cellno] cellno] [--add] [--all]
Change the size of pages pool of *pagesize* on the host. If
*--add* is specified, then *pagecount* pages are added into the
pool. However, if *--add* wasn't specified, then the
*pagecount* is taken as the new absolute size of the pool (this
may be used to free some pages and size the pool down). The
*cellno* modifier can be used to narrow the modification down to
a single host NUMA cell. On the other end of spectrum lies
*--all* which executes the modification on all NUMA cells.
cpu-baseline
------------
**Syntax:**
::
cpu-baseline FILE [--features] [--migratable]
Compute baseline CPU which will be supported by all host CPUs given in <file>.
(See ``hypervisor-cpu-baseline`` command to get a CPU which can be provided by a
specific hypervisor.) The list of host CPUs is built by extracting all <cpu>
elements from the <file>. Thus, the <file> can contain either a set of <cpu>
elements separated by new lines or even a set of complete <capabilities>
elements printed by ``capabilities`` command. If *--features* is specified,
then the resulting XML description will explicitly include all features that
make up the CPU, without this option features that are part of the CPU model
will not be listed in the XML description. If *--migratable* is specified,
features that block migration will not be included in the resulting CPU.
cpu-compare
-----------
**Syntax:**
::
cpu-compare FILE [--error] [--validate]
Compare CPU definition from XML <file> with host CPU. (See
``hypervisor-cpu-compare`` command for comparing the CPU definition with the CPU
which a specific hypervisor is able to provide on the host.) The XML <file> may
contain either host or guest CPU definition. The host CPU definition is the
<cpu> element and its contents as printed by ``capabilities`` command. The
guest CPU definition is the <cpu> element and its contents from domain XML
definition or the CPU definition created from the host CPU model found in
domain capabilities XML (printed by ``domcapabilities`` command). In
addition to the <cpu> element itself, this command accepts
full domain XML, capabilities XML, or domain capabilities XML containing
the CPU definition. For more information on guest CPU definition see:
`https://libvirt.org/formatdomain.html#elementsCPU <https://libvirt.org/formatdomain.html#elementsCPU>`__. If *--error* is
specified, the command will return an error when the given CPU is
incompatible with host CPU and a message providing more details about the
incompatibility will be printed out. If *--validate* is specified, validates
the format of the XML document against an internal RNG schema.
cpu-models
----------
**Syntax:**
::
cpu-models arch
Print the list of CPU models known by libvirt for the specified architecture.
Whether a specific hypervisor is able to create a domain which uses any of
the printed CPU models is a separate question which can be answered by
looking at the domain capabilities XML returned by ``domcapabilities`` command.
Moreover, for some architectures libvirt does not know any CPU models and
the usable CPU models are only limited by the hypervisor. This command will
print that all CPU models are accepted for these architectures and the actual
list of supported CPU models can be checked in the domain capabilities XML.
echo
----
**Syntax:**
::
echo [--shell] [--xml] [err...] [arg...]
Echo back each *arg*, separated by space. If *--shell* is
specified, then the output will be single-quoted where needed, so that
it is suitable for reuse in a shell context. If *--xml* is
specified, then the output will be escaped for use in XML.
If *--err* is specified, prefix ``"error: "`` and output to stderr
instead of stdout.
hypervisor-cpu-compare
----------------------
**Syntax:**
::
hypervisor-cpu-compare FILE [virttype] [emulator] [arch] [machine] [--error] [--validate]
Compare CPU definition from XML <file> with the CPU the hypervisor is able to
provide on the host. (This is different from ``cpu-compare`` which compares the
CPU definition with the host CPU without considering any specific hypervisor
and its abilities.)
The XML *FILE* may contain either a host or guest CPU definition. The host CPU
definition is the <cpu> element and its contents as printed by the
``capabilities`` command. The guest CPU definition is the <cpu> element and its
contents from the domain XML definition or the CPU definition created from the
host CPU model found in the domain capabilities XML (printed by the
``domcapabilities`` command). In addition to the <cpu> element itself, this
command accepts full domain XML, capabilities XML, or domain capabilities XML
containing the CPU definition. For more information on guest CPU definition
see: `https://libvirt.org/formatdomain.html#elementsCPU <https://libvirt.org/formatdomain.html#elementsCPU>`__.
The *virttype* option specifies the virtualization type (usable in the 'type'
attribute of the <domain> top level element from the domain XML). *emulator*
specifies the path to the emulator, *arch* specifies the CPU architecture, and
*machine* specifies the machine type. If *--error* is specified, the command
will return an error when the given CPU is incompatible with the host CPU and a
message providing more details about the incompatibility will be printed out.
If *--validate* is specified, validates the format of the XML document against
an internal RNG schema.
hypervisor-cpu-baseline
-----------------------
**Syntax:**
::
hypervisor-cpu-baseline FILE [virttype] [emulator] [arch] [machine] [--features] [--migratable]
Compute a baseline CPU which will be compatible with all CPUs defined in an XML
*file* and with the CPU the hypervisor is able to provide on the host. (This
is different from ``cpu-baseline`` which does not consider any hypervisor
abilities when computing the baseline CPU.)
The XML *FILE* may contain either host or guest CPU definitions describing the
host CPU model. The host CPU definition is the <cpu> element and its contents
as printed by ``capabilities`` command. The guest CPU definition may be created
from the host CPU model found in domain capabilities XML (printed by
``domcapabilities`` command). In addition to the <cpu> elements, this command
accepts full capabilities XMLs, or domain capabilities XMLs containing the CPU
definitions. It is recommended to use only the CPU definitions from domain
capabilities, as on some architectures using the host CPU definition may either
fail or provide unexpected results.
When *FILE* contains only a single CPU definition, the command will print the
same CPU with restrictions imposed by the capabilities of the hypervisor.
Specifically, running th ``virsh hypervisor-cpu-baseline`` command with no
additional options on the result of ``virsh domcapabilities`` will transform the
host CPU model from domain capabilities XML to a form directly usable in domain
XML.
The *virttype* option specifies the virtualization type (usable in the 'type'
attribute of the <domain> top level element from the domain XML). *emulator*
specifies the path to the emulator, *arch* specifies the CPU architecture, and
*machine* specifies the machine type. If *--features* is specified, then the
resulting XML description will explicitly include all features that make up the
CPU, without this option features that are part of the CPU model will not be
listed in the XML description. If *--migratable* is specified, features that
block migration will not be included in the resulting CPU.
DOMAIN COMMANDS
===============
The following commands manipulate domains directly, as stated
previously most commands take domain as the first parameter. The
*domain* can be specified as a short integer, a name or a full UUID.
autostart
---------
**Syntax:**
::
autostart [--disable] domain
Configure a domain to be automatically started at boot.
The option *--disable* disables autostarting.
blkdeviotune
------------
**Syntax:**
::
blkdeviotune domain device [[--config] [--live] | [--current]]
[[total-bytes-sec] | [read-bytes-sec] [write-bytes-sec]]
[[total-iops-sec] | [read-iops-sec] [write-iops-sec]]
[[total-bytes-sec-max] | [read-bytes-sec-max] [write-bytes-sec-max]]
[[total-iops-sec-max] | [read-iops-sec-max] [write-iops-sec-max]]
[[total-bytes-sec-max-length] |
[read-bytes-sec-max-length] [write-bytes-sec-max-length]]
[[total-iops-sec-max-length] |
[read-iops-sec-max-length] [write-iops-sec-max-length]]
[size-iops-sec] [group-name]
Set or query the block disk io parameters for a block device of *domain*.
*device* specifies a unique target name (<target dev='name'/>) or source
file (<source file='name'/>) for one of the disk devices attached to
*domain* (see also ``domblklist`` for listing these names).
If no limit is specified, it will query current I/O limits setting.
Otherwise, alter the limits with these flags:
*--total-bytes-sec* specifies total throughput limit as a scaled integer, the
default being bytes per second if no suffix is specified.
*--read-bytes-sec* specifies read throughput limit as a scaled integer, the
default being bytes per second if no suffix is specified.
*--write-bytes-sec* specifies write throughput limit as a scaled integer, the
default being bytes per second if no suffix is specified.
*--total-iops-sec* specifies total I/O operations limit per second.
*--read-iops-sec* specifies read I/O operations limit per second.
*--write-iops-sec* specifies write I/O operations limit per second.
*--total-bytes-sec-max* specifies maximum total throughput limit as a scaled
integer, the default being bytes per second if no suffix is specified
*--read-bytes-sec-max* specifies maximum read throughput limit as a scaled
integer, the default being bytes per second if no suffix is specified.
*--write-bytes-sec-max* specifies maximum write throughput limit as a scaled
integer, the default being bytes per second if no suffix is specified.
*--total-iops-sec-max* specifies maximum total I/O operations limit per second.
*--read-iops-sec-max* specifies maximum read I/O operations limit per second.
*--write-iops-sec-max* specifies maximum write I/O operations limit per second.
*--total-bytes-sec-max-length* specifies duration in seconds to allow maximum
total throughput limit.
*--read-bytes-sec-max-length* specifies duration in seconds to allow maximum
read throughput limit.
*--write-bytes-sec-max-length* specifies duration in seconds to allow maximum
write throughput limit.
*--total-iops-sec-max-length* specifies duration in seconds to allow maximum
total I/O operations limit.
*--read-iops-sec-max-length* specifies duration in seconds to allow maximum
read I/O operations limit.
*--write-iops-sec-max-length* specifies duration in seconds to allow maximum
write I/O operations limit.
*--size-iops-sec* specifies size I/O operations limit per second.
*--group-name* specifies group name to share I/O quota between multiple drives.
For a QEMU domain, if no name is provided, then the default is to have a single
group for each *device*.
Older versions of virsh only accepted these options with underscore
instead of dash, as in *--total_bytes_sec*.
Bytes and iops values are independent, but setting only one value (such
as --read-bytes-sec) resets the other two in that category to unlimited.
An explicit 0 also clears any limit. A non-zero value for a given total
cannot be mixed with non-zero values for read or write.
It is up to the hypervisor to determine how to handle the length values.
For the QEMU hypervisor, if an I/O limit value or maximum value is set,
then the default value of 1 second will be displayed. Supplying a 0 will
reset the value back to the default.
If *--live* is specified, affect a running guest.
If *--config* is specified, affect the next start of a persistent guest.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest.
When setting the disk io parameters both *--live* and *--config* flags may be
given, but *--current* is exclusive. For querying only one of *--live*,
*--config* or *--current* can be specified. If no flag is specified, behavior
is different depending on hypervisor.
blkiotune
---------
**Syntax:**
::
blkiotune domain [--weight weight] [--device-weights device-weights]
[--device-read-iops-sec device-read-iops-sec]
[--device-write-iops-sec device-write-iops-sec]
[--device-read-bytes-sec device-read-bytes-sec]
[--device-write-bytes-sec device-write-bytes-sec]
[[--config] [--live] | [--current]]
Display or set the blkio parameters. QEMU/KVM supports *--weight*.
*--weight* is in range [100, 1000]. After kernel 2.6.39, the value
could be in the range [10, 1000].
``device-weights`` is a single string listing one or more device/weight
pairs, in the format of /path/to/device,weight,/path/to/device,weight.
Each weight is in the range [100, 1000], [10, 1000] after kernel 2.6.39,
or the value 0 to remove that device from per-device listings.
Only the devices listed in the string are modified;
any existing per-device weights for other devices remain unchanged.
``device-read-iops-sec`` is a single string listing one or more device/read_iops_sec
pairs, int the format of /path/to/device,read_iops_sec,/path/to/device,read_iops_sec.
Each read_iops_sec is a number which type is unsigned int, value 0 to remove that
device from per-device listing.
Only the devices listed in the string are modified;
any existing per-device read_iops_sec for other devices remain unchanged.
``device-write-iops-sec`` is a single string listing one or more device/write_iops_sec
pairs, int the format of /path/to/device,write_iops_sec,/path/to/device,write_iops_sec.
Each write_iops_sec is a number which type is unsigned int, value 0 to remove that
device from per-device listing.
Only the devices listed in the string are modified;
any existing per-device write_iops_sec for other devices remain unchanged.
``device-read-bytes-sec`` is a single string listing one or more device/read_bytes_sec
pairs, int the format of /path/to/device,read_bytes_sec,/path/to/device,read_bytes_sec.
Each read_bytes_sec is a number which type is unsigned long long, value 0 to remove
that device from per-device listing.
Only the devices listed in the string are modified;
any existing per-device read_bytes_sec for other devices remain unchanged.
``device-write-bytes-sec`` is a single string listing one or more device/write_bytes_sec
pairs, int the format of /path/to/device,write_bytes_sec,/path/to/device,write_bytes_sec.
Each write_bytes_sec is a number which type is unsigned long long, value 0 to remove
that device from per-device listing.
Only the devices listed in the string are modified;
any existing per-device write_bytes_sec for other devices remain unchanged.
If *--live* is specified, affect a running guest.
If *--config* is specified, affect the next start of a persistent guest.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest.
Both *--live* and *--config* flags may be given, but *--current* is
exclusive. If no flag is specified, behavior is different depending
on hypervisor.
blockcommit
-----------
**Syntax:**
::
blockcommit domain path [bandwidth] [--bytes] [base]
[--shallow] [top] [--delete] [--keep-relative]
[--wait [--async] [--verbose]] [--timeout seconds]
[--active] [{--pivot | --keep-overlay}]
Reduce the length of a backing image chain, by committing changes at the
top of the chain (snapshot or delta files) into backing images. By
default, this command attempts to flatten the entire chain. If *base*
and/or *top* are specified as files within the backing chain, then the
operation is constrained to committing just that portion of the chain;
*--shallow* can be used instead of *base* to specify the immediate
backing file of the resulting top image to be committed. The files
being committed are rendered invalid, possibly as soon as the operation
starts; using the *--delete* flag will attempt to remove these invalidated
files at the successful completion of the commit operation. When the
*--keep-relative* flag is used, the backing file paths will be kept relative.
When *top* is omitted or specified as the active image, it is also
possible to specify *--active* to trigger a two-phase active commit. In
the first phase, *top* is copied into *base* and the job can only be
canceled, with top still containing data not yet in base. In the second
phase, *top* and *base* remain identical until a call to ``blockjob``
with the *--abort* flag (keeping top as the active image that tracks
changes from that point in time) or the *--pivot* flag (making base
the new active image and invalidating top).
By default, this command returns as soon as possible, and data for
the entire disk is committed in the background; the progress of the
operation can be checked with ``blockjob``. However, if *--wait* is
specified, then this command will block until the operation completes
(or for *--active*, enters the second phase), or until the operation
is canceled because the optional *timeout* in seconds elapses
or SIGINT is sent (usually with ``Ctrl-C``). Using *--verbose* along
with *--wait* will produce periodic status updates. If job cancellation
is triggered, *--async* will return control to the user as fast as
possible, otherwise the command may continue to block a little while
longer until the job is done cleaning up. Using *--pivot* is shorthand
for combining *--active* *--wait* with an automatic ``blockjob``
*--pivot*; and using *--keep-overlay* is shorthand for combining
*--active* *--wait* with an automatic ``blockjob`` *--abort*.
*path* specifies fully-qualified path of the disk; it corresponds
to a unique target name (<target dev='name'/>) or source file (<source
file='name'/>) for one of the disk devices attached to *domain* (see
also ``domblklist`` for listing these names).
*bandwidth* specifies copying bandwidth limit in MiB/s, although for
QEMU, it may be non-zero only for an online domain. For further information
on the *bandwidth* argument see the corresponding section for the ``blockjob``
command.
blockcopy
---------
**Syntax:**
::
blockcopy domain path { dest [format] [--blockdev] | --xml file }
[--shallow] [--reuse-external] [bandwidth]
[--wait [--async] [--verbose]] [{--pivot | --finish}]
[--timeout seconds] [granularity] [buf-size] [--bytes]
[--transient-job]
Copy a disk backing image chain to a destination. Either *dest* as
the destination file name, or *--xml* with the name of an XML file containing
a top-level <disk> element describing the destination, must be present.
Additionally, if *dest* is given, *format* should be specified to declare
the format of the destination (if *format* is omitted, then libvirt
will reuse the format of the source, or with *--reuse-external* will
be forced to probe the destination format, which could be a potential
security hole). The command supports *--raw* as a boolean flag synonym for
*--format=raw*. When using *dest*, the destination is treated as a regular
file unless *--blockdev* is used to signal that it is a block device. By
default, this command flattens the entire chain; but if *--shallow* is
specified, the copy shares the backing chain.
If *--reuse-external* is specified, then the destination must exist and have
sufficient space to hold the copy. If *--shallow* is used in
conjunction with *--reuse-external* then the pre-created image must have
guest visible contents identical to guest visible contents of the backing
file of the original image. This may be used to modify the backing file
names on the destination.
By default, the copy job runs in the background, and consists of two
phases. Initially, the job must copy all data from the source, and
during this phase, the job can only be canceled to revert back to the
source disk, with no guarantees about the destination. After this phase
completes, both the source and the destination remain mirrored until a
call to ``blockjob`` with the *--abort* and *--pivot* flags pivots over
to the copy, or a call without *--pivot* leaves the destination as a
faithful copy of that point in time. However, if *--wait* is specified,
then this command will block until the mirroring phase begins, or cancel
the operation if the optional *timeout* in seconds elapses or SIGINT is
sent (usually with ``Ctrl-C``). Using *--verbose* along with *--wait*
will produce periodic status updates. Using *--pivot* (similar to
``blockjob`` *--pivot*) or *--finish* (similar to ``blockjob`` *--abort*)
implies *--wait*, and will additionally end the job cleanly rather than
leaving things in the mirroring phase. If job cancellation is triggered
by timeout or by *--finish*, *--async* will return control to the user
as fast as possible, otherwise the command may continue to block a little
while longer until the job has actually cancelled.
*path* specifies fully-qualified path of the disk.
*bandwidth* specifies copying bandwidth limit in MiB/s. Specifying a negative
value is interpreted as an unsigned long long value that might be essentially
unlimited, but more likely would overflow; it is safer to use 0 for that
purpose. For further information on the *bandwidth* argument see the
corresponding section for the ``blockjob`` command.
Specifying *granularity* allows fine-tuning of the granularity that will be
copied when a dirty region is detected; larger values trigger less
I/O overhead but may end up copying more data overall (the default value is
usually correct); hypervisors may restrict this to be a power of two or fall
within a certain range. Specifying *buf-size* will control how much data can
be simultaneously in-flight during the copy; larger values use more memory but
may allow faster completion (the default value is usually correct).
*--transient-job* allows specifying that the user does not require the job to
be recovered if the VM crashes or is turned off before the job completes. This
flag removes the restriction of copy jobs to transient domains if that
restriction is applied by the hypervisor.
blockjob
--------
**Syntax:**
::
blockjob domain path { [--abort] [--async] [--pivot] |
[--info] [--raw] [--bytes] | [bandwidth] }
Manage active block operations. There are three mutually-exclusive modes:
*--info*, *bandwidth*, and *--abort*. *--async* and *--pivot* imply
abort mode; *--raw* implies info mode; and if no mode was given, *--info*
mode is assumed.
*path* specifies fully-qualified path of the disk; it corresponds
to a unique target name (<target dev='name'/>) or source file (<source
file='name'/>) for one of the disk devices attached to *domain* (see
also ``domblklist`` for listing these names).
In *--abort* mode, the active job on the specified disk will
be aborted. If *--async* is also specified, this command will return
immediately, rather than waiting for the cancellation to complete. If
*--pivot* is specified, this requests that an active copy or active
commit job be pivoted over to the new image.
In *--info* mode, the active job information on the specified
disk will be printed. By default, the output is a single human-readable
summary line; this format may change in future versions. Adding
*--raw* lists each field of the struct, in a stable format. If the
*--bytes* flag is set, then the command errors out if the server could
not supply bytes/s resolution; when omitting the flag, raw output is
listed in MiB/s and human-readable output automatically selects the
best resolution supported by the server.
*bandwidth* can be used to set bandwidth limit for the active job in MiB/s.
If *--bytes* is specified then the bandwidth value is interpreted in
bytes/s. Specifying a negative value is interpreted as an unsigned long
value or essentially unlimited. The hypervisor can choose whether to
reject the value or convert it to the maximum value allowed. Optionally a
scaled positive number may be used as bandwidth (see ``NOTES`` above). Using
*--bytes* with a scaled value permits a finer granularity to be selected.
A scaled value used without *--bytes* will be rounded down to MiB/s. Note
that the *--bytes* may be unsupported by the hypervisor.
Note that the progress reported for blockjobs corresponding to a pull-mode
backup don't report progress of the backup but rather usage of temporary
space required for the backup.
blockpull
---------
**Syntax:**
::
blockpull domain path [bandwidth] [--bytes] [base]
[--wait [--verbose] [--timeout seconds] [--async]]
[--keep-relative]
Populate a disk from its backing image chain. By default, this command
flattens the entire chain; but if *base* is specified, containing the
name of one of the backing files in the chain, then that file becomes
the new backing file and only the intermediate portion of the chain is
pulled. Once all requested data from the backing image chain has been
pulled, the disk no longer depends on that portion of the backing chain.
By default, this command returns as soon as possible, and data for
the entire disk is pulled in the background; the progress of the
operation can be checked with ``blockjob``. However, if *--wait* is
specified, then this command will block until the operation completes,
or cancel the operation if the optional *timeout* in seconds elapses
or SIGINT is sent (usually with ``Ctrl-C``). Using *--verbose* along
with *--wait* will produce periodic status updates. If job cancellation
is triggered, *--async* will return control to the user as fast as
possible, otherwise the command may continue to block a little while
longer until the job is done cleaning up.
Using the *--keep-relative* flag will keep the backing chain names
relative.
*path* specifies fully-qualified path of the disk; it corresponds
to a unique target name (<target dev='name'/>) or source file (<source
file='name'/>) for one of the disk devices attached to *domain* (see
also ``domblklist`` for listing these names).
*bandwidth* specifies copying bandwidth limit in MiB/s. For further information
on the *bandwidth* argument see the corresponding section for the ``blockjob``
command.
blockresize
-----------
**Syntax:**
::
blockresize domain path size
Resize a block device of domain while the domain is running, *path*
specifies the absolute path of the block device; it corresponds
to a unique target name (<target dev='name'/>) or source file (<source
file='name'/>) for one of the disk devices attached to *domain* (see
also ``domblklist`` for listing these names).
*size* is a scaled integer (see ``NOTES`` above) which defaults to KiB
(blocks of 1024 bytes) if there is no suffix. You must use a suffix of
"B" to get bytes (note that for historical reasons, this differs from
``vol-resize`` which defaults to bytes without a suffix).
console
-------
**Syntax:**
::
console domain [devname] [--safe] [--force]
Connect the virtual serial console for the guest. The optional
*devname* parameter refers to the device alias of an alternate
console, serial or parallel device configured for the guest.
If omitted, the primary console will be opened.
If the flag *--safe* is specified, the connection is only attempted
if the driver supports safe console handling. This flag specifies that
the server has to ensure exclusive access to console devices. Optionally
the *--force* flag may be specified, requesting to disconnect any existing
sessions, such as in a case of a broken connection.
cpu-stats
---------
**Syntax:**
::
cpu-stats domain [--total] [start] [count]
Provide cpu statistics information of a domain. The domain should
be running. Default it shows stats for all CPUs, and a total. Use
*--total* for only the total stats, *start* for only the per-cpu
stats of the CPUs from *start*, *count* for only *count* CPUs'
stats.
create
------
**Syntax:**
::
create FILE [--console] [--paused] [--autodestroy]
[--pass-fds N,M,...] [--validate]
Create a domain from an XML <file>. Optionally, *--validate* option can be
passed to validate the format of the input XML file against an internal RNG
schema (identical to using virt-xml-validate(1) tool). Domains created using
this command are going to be either transient (temporary ones that will vanish
once destroyed) or existing persistent guests that will run with one-time use
configuration, leaving the persistent XML untouched (this can come handy during
an automated testing of various configurations all based on the original XML).
See the example below for usage demonstration.
The domain will be paused if the *--paused* option is used
and supported by the driver; otherwise it will be running. If *--console* is
requested, attach to the console after creation.
If *--autodestroy* is requested, then the guest will be automatically
destroyed when virsh closes its connection to libvirt, or otherwise
exits.
If *--pass-fds* is specified, the argument is a comma separated list
of open file descriptors which should be pass on into the guest. The
file descriptors will be re-numbered in the guest, starting from 3. This
is only supported with container based virtualization.
**Example:**
#. prepare a template from an existing domain (skip directly to 3a if writing
one from scratch)
::
# virsh dumpxml <domain> > domain.xml
#. edit the template using an editor of your choice and:
a. DO CHANGE! <name> and <uuid> (<uuid> can also be removed), or
b. DON'T CHANGE! either <name> or <uuid>
::
# $EDITOR domain.xml
#. create a domain from domain.xml, depending on whether following 2a or 2b
respectively:
a. the domain is going to be transient
b. an existing persistent guest will run with a modified one-time
configuration
::
# virsh create domain.xml
define
------
**Syntax:**
::
define FILE [--validate]
Define a domain from an XML <file>. Optionally, the format of the input XML
file can be validated against an internal RNG schema with *--validate*
(identical to using virt-xml-validate(1) tool). The domain definition is
registered but not started. If domain is already running, the changes will take
effect on the next boot.
desc
----
**Syntax:**
::
desc domain [[--live] [--config] |
[--current]] [--title] [--edit] [--new-desc
New description or title message]
Show or modify description and title of a domain. These values are user
fields that allow storing arbitrary textual data to allow easy
identification of domains. Title should be short, although it's not enforced.
(See also ``metadata`` that works with XML based domain metadata.)
Flags *--live* or *--config* select whether this command works on live
or persistent definitions of the domain. If both *--live* and *--config*
are specified, the *--config* option takes precedence on getting the current
description and both live configuration and config are updated while setting
the description. *--current* is exclusive and implied if none of these was
specified.
Flag *--edit* specifies that an editor with the contents of current
description or title should be opened and the contents saved back afterwards.
Flag *--title* selects operation on the title field instead of description.
If neither of *--edit* and *--new-desc* are specified the note or description
is displayed instead of being modified.
destroy
-------
**Syntax:**
::
destroy domain [--graceful]
Immediately terminate the domain *domain*. This doesn't give the domain
OS any chance to react, and it's the equivalent of ripping the power
cord out on a physical machine. In most cases you will want to use
the ``shutdown`` command instead. However, this does not delete any
storage volumes used by the guest, and if the domain is persistent, it
can be restarted later.
If *domain* is transient, then the metadata of any snapshots will
be lost once the guest stops running, but the snapshot contents still
exist, and a new domain with the same name and UUID can restore the
snapshot metadata with ``snapshot-create``. Similarly, the metadata of
any checkpoints will be lost, but can be restored with ``checkpoint-create``.
If *--graceful* is specified, don't resort to extreme measures
(e.g. SIGKILL) when the guest doesn't stop after a reasonable timeout;
return an error instead.
domblkerror
-----------
**Syntax:**
::
domblkerror domain
Show errors on block devices. This command usually comes handy when
``domstate`` command says that a domain was paused due to I/O error.
The ``domblkerror`` command lists all block devices in error state and
the error seen on each of them.
domblkinfo
----------
**Syntax:**
::
domblkinfo domain [block-device --all] [--human]
Get block device size info for a domain. A *block-device* corresponds
to a unique target name (<target dev='name'/>) or source file (<source
file='name'/>) for one of the disk devices attached to *domain* (see
also ``domblklist`` for listing these names). If *--human* is set, the
output will have a human readable output.
If *--all* is set, the output will be a table showing all block devices
size info associated with *domain*.
The *--all* option takes precedence of the others.
domblklist
----------
**Syntax:**
::
domblklist domain [--inactive] [--details]
Print a table showing the brief information of all block devices
associated with *domain*. If *--inactive* is specified, query the
block devices that will be used on the next boot, rather than those
currently in use by a running domain. If *--details* is specified,
disk type and device value will also be printed. Other contexts
that require a block device name (such as *domblkinfo* or
*snapshot-create* for disk snapshots) will accept either target
or unique source names printed by this command.
domblkstat
----------
**Syntax:**
::
domblkstat domain [block-device] [--human]
Get device block stats for a running domain. A *block-device* corresponds
to a unique target name (<target dev='name'/>) or source file (<source
file='name'/>) for one of the disk devices attached to *domain* (see
also ``domblklist`` for listing these names). On a LXC or QEMU domain,
omitting the *block-device* yields device block stats summarily for the
entire domain.
Use *--human* for a more human readable output.
Availability of these fields depends on hypervisor. Unsupported fields are
missing from the output. Other fields may appear if communicating with a newer
version of libvirtd.
Explanation of fields (fields appear in the following order):
* rd_req - count of read operations
* rd_bytes - count of read bytes
* wr_req - count of write operations
* wr_bytes - count of written bytes
* errs - error count
* flush_operations - count of flush operations
* rd_total_times - total time read operations took (ns)
* wr_total_times - total time write operations took (ns)
* flush_total_times - total time flush operations took (ns)
* <-- other fields provided by hypervisor -->
domblkthreshold
---------------
**Syntax:**
::
domblkthreshold domain dev threshold
Set the threshold value for delivering the block-threshold event. *dev*
specifies the disk device target or backing chain element of given device using
the 'target[1]' syntax. *threshold* is a scaled value of the offset. If the
block device should write beyond that offset the event will be delivered.
domcontrol
----------
**Syntax:**
::
domcontrol domain
Returns state of an interface to VMM used to control a domain. For
states other than "ok" or "error" the command also prints number of
seconds elapsed since the control interface entered its current state.
domdisplay
----------
**Syntax:**
::
domdisplay domain [--include-password] [[--type] type] [--all]
Output a URI which can be used to connect to the graphical display of the
domain via VNC, SPICE or RDP. The particular graphical display type can
be selected using the ``type`` parameter (e.g. "vnc", "spice", "rdp"). If
*--include-password* is specified, the SPICE channel password will be
included in the URI. If *--all* is specified, then all show all possible
graphical displays, for a VM could have more than one graphical displays.
domfsfreeze
-----------
**Syntax:**
::
domfsfreeze domain [[--mountpoint] mountpoint...]
Freeze mounted filesystems within a running domain to prepare for consistent
snapshots.
The *--mountpoint* option takes a parameter ``mountpoint``, which is a
mount point path of the filesystem to be frozen. This option can occur
multiple times. If this is not specified, every mounted filesystem is frozen.
Note: ``snapshot-create`` command has a *--quiesce* option to freeze
and thaw the filesystems automatically to keep snapshots consistent.
``domfsfreeze`` command is only needed when a user wants to utilize the
native snapshot features of storage devices not supported by libvirt.
domfsinfo
---------
**Syntax:**
::
domfsinfo domain
Show a list of mounted filesystems within the running domain. The list contains
mountpoints, names of a mounted device in the guest, filesystem types, and
unique target names used in the domain XML (<target dev='name'/>).
Note that this command requires a guest agent configured and running in the
domain's guest OS.
domfsthaw
---------
**Syntax:**
::
domfsthaw domain [[--mountpoint] mountpoint...]
Thaw mounted filesystems within a running domain, which have been frozen by
domfsfreeze command.
The *--mountpoint* option takes a parameter ``mountpoint``, which is a
mount point path of the filesystem to be thawed. This option can occur
multiple times. If this is not specified, every mounted filesystem is thawed.
domfstrim
---------
**Syntax:**
::
domfstrim domain [--minimum bytes] [--mountpoint mountPoint]
Issue a fstrim command on all mounted filesystems within a running
domain. It discards blocks which are not in use by the filesystem.
If *--minimum* ``bytes`` is specified, it tells guest kernel length
of contiguous free range. Smaller than this may be ignored (this is
a hint and the guest may not respect it). By increasing this value,
the fstrim operation will complete more quickly for filesystems
with badly fragmented free space, although not all blocks will
be discarded. The default value is zero, meaning "discard
every free block". Moreover, if a user wants to trim only one mount
point, it can be specified via optional *--mountpoint* parameter.
domhostname
-----------
**Syntax:**
::
domhostname domain [--source lease|agent]
Returns the hostname of a domain, if the hypervisor makes it available.
The *--source* argument specifies what data source to use for the
hostnames, currently 'lease' to read DHCP leases or 'agent' to query
the guest OS via an agent. If unspecified, driver returns the default
method available (some drivers support only one type of source).
domid
-----
**Syntax:**
::
domid domain-name-or-uuid
Convert a domain name (or UUID) to a domain id
domif-getlink
-------------
**Syntax:**
::
domif-getlink domain interface-device [--config]
Query link state of the domain's virtual interface. If *--config*
is specified, query the persistent configuration, for compatibility
purposes, *--persistent* is alias of *--config*.
*interface-device* can be the interface's target name or the MAC address.
domif-setlink
-------------
**Syntax:**
::
domif-setlink domain interface-device state [--config]
Modify link state of the domain's virtual interface. Possible values for
state are "up" and "down". If *--config* is specified, only the persistent
configuration of the domain is modified, for compatibility purposes,
*--persistent* is alias of *--config*.
*interface-device* can be the interface's target name or the MAC address.
domifaddr
---------
**Syntax:**
::
domifaddr domain [interface] [--full]
[--source lease|agent|arp]
Get a list of interfaces of a running domain along with their IP and MAC
addresses, or limited output just for one interface if *interface* is
specified. Note that *interface* can be driver dependent, it can be the name
within guest OS or the name you would see in domain XML. Moreover, the whole
command may require a guest agent to be configured for the queried domain under
some hypervisors, notably QEMU.
If *--full* is specified, the interface name and MAC address is always
displayed when the interface has multiple IP addresses or aliases; otherwise,
only the interface name and MAC address is displayed for the first name and
MAC address with "-" for the others using the same name and MAC address.
The *--source* argument specifies what data source to use for the
addresses, currently 'lease' to read DHCP leases, 'agent' to query
the guest OS via an agent, or 'arp' to get IP from host's arp tables.
If unspecified, 'lease' is the default.
backup-begin
------------
**Syntax:**
::
backup-begin domain [backupxml] [checkpointxml] [--reuse-external]
Begin a new backup job. If *backupxml* is omitted, this defaults to a full
backup using a push model to filenames generated by libvirt; supplying XML
allows fine-tuning such as requesting an incremental backup relative to an
earlier checkpoint, controlling which disks participate or which
filenames are involved, or requesting the use of a pull model backup.
The *backup-dumpxml* command shows any resulting values assigned by
libvirt. For more information on backup XML, see:
`https://libvirt.org/formatbackup.html <https://libvirt.org/formatbackup.html>`__
If *--reuse-external* is used it instructs libvirt to reuse temporary
and output files provided by the user in *backupxml*.
If *checkpointxml* is specified, a second file with a top-level
element of *domaincheckpoint* is used to create a simultaneous
checkpoint, for doing a later incremental backup relative to the time
the backup was created. See *checkpoint-create* for more details on
checkpoints.
This command returns as soon as possible, and the backup job runs in
the background; the progress of a push model backup can be checked
with *domjobinfo* or by waiting for an event with *event* (the
progress of a pull model backup is under the control of whatever third
party connects to the NBD export). The job is ended with *domjobabort*.
backup-dumpxml
--------------
**Syntax:**
::
backup-dumpxml domain
Output XML describing the current backup job.
domiflist
---------
**Syntax:**
::
domiflist domain [--inactive]
Print a table showing the brief information of all virtual interfaces
associated with *domain*. If *--inactive* is specified, query the
virtual interfaces that will be used on the next boot, rather than those
currently in use by a running domain. Other contexts that require a MAC
address of virtual interface (such as *detach-interface* or
*domif-setlink*) will accept the MAC address printed by this command.
domifstat
---------
**Syntax:**
::
domifstat domain interface-device
Get network interface stats for a running domain. The network
interface stats are only available for interfaces that have a
physical source interface. This does not include, for example, a
'user' interface type since it is a virtual LAN with NAT to the
outside world. *interface-device* can be the interface target by
name or MAC address.
domiftune
---------
**Syntax:**
::
domiftune domain interface-device [[--config] [--live] | [--current]]
[*--inbound average,peak,burst,floor*]
[*--outbound average,peak,burst*]
Set or query the domain's network interface's bandwidth parameters.
*interface-device* can be the interface's target name (<target dev='name'/>),
or the MAC address.
If no *--inbound* or *--outbound* is specified, this command will
query and show the bandwidth settings. Otherwise, it will set the
inbound or outbound bandwidth. *average,peak,burst,floor* is the same as
in command *attach-interface*. Values for *average*, *peak* and *floor*
are expressed in kilobytes per second, while *burst* is expressed in kilobytes
in a single burst at *peak* speed as described in the Network XML
documentation at `https://libvirt.org/formatnetwork.html#elementQoS <https://libvirt.org/formatnetwork.html#elementQoS>`__.
To clear inbound or outbound settings, use *--inbound* or *--outbound*
respectfully with average value of zero.
If *--live* is specified, affect a running guest.
If *--config* is specified, affect the next start of a persistent guest.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest.
Both *--live* and *--config* flags may be given, but *--current* is
exclusive. If no flag is specified, behavior is different depending
on hypervisor.
dominfo
-------
**Syntax:**
::
dominfo domain
Returns basic information about the domain.
domjobabort
-----------
**Syntax:**
::
domjobabort domain
Abort the currently running domain job.
domjobinfo
----------
**Syntax:**
::
domjobinfo domain [--completed [--keep-completed]] [--anystats] [--rawstats]
Returns information about jobs running on a domain. *--completed* tells
virsh to return information about a recently finished job. Statistics of
a completed job are automatically destroyed once read (unless
*--keep-completed* is used) or when libvirtd is restarted.
Normally only statistics for running and successful completed jobs are printed.
*--anystats* can be used to also display statistics for failed jobs.
In case *--rawstats* is used, all fields are printed as received from the
server without any attempts to interpret the data. The "Job type:" field is
special, since it's reported by the API and not part of stats.
Note that time information returned for completed
migrations may be completely irrelevant unless both source and
destination hosts have synchronized time (i.e., NTP daemon is running
on both of them).
dommemstat
----------
**Syntax:**
::
dommemstat domain [--period seconds] [[--config] [--live] | [--current]]
Get memory stats for a running domain.
Availability of these fields depends on hypervisor. Unsupported fields are
missing from the output. Other fields may appear if communicating with a newer
version of libvirtd.
Explanation of fields:
* ``swap_in`` - The amount of data read from swap space (in KiB)
* ``swap_out`` - The amount of memory written out to swap space (in KiB)
* ``major_fault`` - The number of page faults where disk IO was required
* ``minor_fault`` - The number of other page faults
* ``unused`` - The amount of memory left unused by the system (in KiB)
* ``available`` - The amount of usable memory as seen by the domain (in KiB)
* ``actual`` - Current balloon value (in KiB)
* ``rss`` - Resident Set Size of the running domain's process (in KiB)
* ``usable`` - The amount of memory which can be reclaimed by balloon
without causing host swapping (in KiB)
* ``last-update`` - Timestamp of the last update of statistics (in seconds)
* ``disk_caches`` - The amount of memory that can be reclaimed without
additional I/O, typically disk caches (in KiB)
* ``hugetlb_pgalloc`` - The number of successful huge page allocations initiated
from within the domain
* ``hugetlb_pgfail`` - The number of failed huge page allocations initiated from
within the domain
For QEMU/KVM with a memory balloon, setting the optional *--period* to a
value larger than 0 in seconds will allow the balloon driver to return
additional statistics which will be displayed by subsequent ``dommemstat``
commands. Setting the *--period* to 0 will stop the balloon driver collection,
but does not clear the statistics in the balloon driver. Requires at least
QEMU/KVM 1.5 to be running on the host.
The *--live*, *--config*, and *--current* flags are only valid when using
the *--period* option in order to set the collection period for the balloon
driver. If *--live* is specified, only the running guest collection period
is affected. If *--config* is specified, affect the next start of a persistent
guest. If *--current* is specified, it is equivalent to either *--live*
or *--config*, depending on the current state of the guest.
Both *--live* and *--config* flags may be given, but *--current* is
exclusive. If no flag is specified, behavior is different depending
on the guest state.
domname
-------
**Syntax:**
::
domname domain-id-or-uuid
Convert a domain Id (or UUID) to domain name
dompmsuspend
------------
**Syntax:**
::
dompmsuspend domain target [--duration]
Suspend a running domain into one of these states (possible *target*
values):
* ``mem`` - equivalent of S3 ACPI state
* ``disk`` - equivalent of S4 ACPI state
* ``hybrid`` - RAM is saved to disk but not powered off
The *--duration* argument specifies number of seconds before the domain is
woken up after it was suspended (see also ``dompmwakeup``). Default is 0 for
unlimited suspend time. (This feature isn't currently supported by any
hypervisor driver and 0 should be used.).
Note that this command requires a guest agent configured and running in the
domain's guest OS.
Beware that at least for QEMU, the domain's process will be terminated when
target disk is used and a new process will be launched when libvirt is asked
to wake up the domain. As a result of this, any runtime changes, such as
device hotplug or memory settings, are lost unless such changes were made
with *--config* flag.
dompmwakeup
-----------
**Syntax:**
::
dompmwakeup domain
Wakeup a domain from pmsuspended state (either suspended by dompmsuspend or
from the guest itself). Injects a wakeup into the guest that is in pmsuspended
state, rather than waiting for the previously requested duration (if any) to
elapse. This operation does not necessarily fail if the domain is running.
domrename
---------
**Syntax:**
::
domrename domain new-name
Rename a domain. This command changes current domain name to the new name
specified in the second argument.
``Note``: Domain must be inactive and without snapshots or checkpoints.
domstate
--------
**Syntax:**
::
domstate domain [--reason]
Returns state about a domain. *--reason* tells virsh to also print
reason for the state.
domstats
--------
**Syntax:**
::
domstats [--raw] [--enforce] [--backing] [--nowait] [--state]
[--cpu-total] [--balloon] [--vcpu] [--interface]
[--block] [--perf] [--iothread] [--memory]
[[--list-active] [--list-inactive]
[--list-persistent] [--list-transient] [--list-running]y
[--list-paused] [--list-shutoff] [--list-other]] | [domain ...]
Get statistics for multiple or all domains. Without any argument this
command prints all available statistics for all domains.
The list of domains to gather stats for can be either limited by listing
the domains as a space separated list, or by specifying one of the
filtering flags *--list-NNN*. (The approaches can't be combined.)
By default some of the returned fields may be converted to more
human friendly values by a set of pretty-printers. To suppress this
behavior use the *--raw* flag.
The individual statistics groups are selectable via specific flags. By
default all supported statistics groups are returned. Supported
statistics groups flags are: *--state*, *--cpu-total*, *--balloon*,
*--vcpu*, *--interface*, *--block*, *--perf*, *--iothread*, *--memory*.
Note that - depending on the hypervisor type and version or the domain state
- not all of the following statistics may be returned.
When selecting the *--state* group the following fields are returned:
* ``state.state`` - state of the VM, returned as number from
virDomainState enum
* ``state.reason`` - reason for entering given state, returned
as int from virDomain*Reason enum corresponding
to given state
*--cpu-total* returns:
* ``cpu.time`` - total cpu time spent for this domain in nanoseconds
* ``cpu.user`` - user cpu time spent in nanoseconds
* ``cpu.system`` - system cpu time spent in nanoseconds
* ``cpu.cache.monitor.count`` - the number of cache monitors for this
domain
* ``cpu.cache.monitor.<num>.name`` - the name of cache monitor <num>
* ``cpu.cache.monitor.<num>.vcpus`` - vcpu list of cache monitor <num>
* ``cpu.cache.monitor.<num>.bank.count`` - the number of cache banks
in cache monitor <num>
* ``cpu.cache.monitor.<num>.bank.<index>.id`` - host allocated cache id
for bank <index> in cache monitor <num>
* ``cpu.cache.monitor.<num>.bank.<index>.bytes`` - the number of bytes
of last level cache that the domain is using on cache bank <index>
*--balloon* returns:
* ``balloon.current`` - the memory in KiB currently used
* ``balloon.maximum`` - the maximum memory in KiB allowed
* ``balloon.swap_in`` - the amount of data read from swap space (in KiB)
* ``balloon.swap_out`` - the amount of memory written out to swap
space (in KiB)
* ``balloon.major_fault`` - the number of page faults when disk IO
was required
* ``balloon.minor_fault`` - the number of other page faults
* ``balloon.unused`` - the amount of memory left unused by the
system (in KiB)
* ``balloon.available`` - the amount of usable memory as seen by
the domain (in KiB)
* ``balloon.rss`` - Resident Set Size of running domain's process
(in KiB)
* ``balloon.usable`` - the amount of memory which can be reclaimed by
balloon without causing host swapping (in KiB)
* ``balloon.last-update`` - timestamp of the last update of statistics
(in seconds)
* ``balloon.disk_caches`` - the amount of memory that can be reclaimed
without additional I/O, typically disk (in KiB)
* ``balloon.hugetlb_pgalloc`` - the number of successful huge page allocations
from inside the domain via virtio balloon
* ``balloon.hugetlb_pgfail`` - the number of failed huge page allocations
from inside the domain via virtio balloon
*--vcpu* returns:
* ``vcpu.current`` - current number of online virtual CPUs
* ``vcpu.maximum`` - maximum number of online virtual CPUs
* ``vcpu.<num>.state`` - state of the virtual CPU <num>, as
number from virVcpuState enum
* ``vcpu.<num>.time`` - virtual cpu time spent by virtual
CPU <num> (in microseconds)
* ``vcpu.<num>.wait`` - virtual cpu time spent by virtual
CPU <num> waiting on I/O (in microseconds)
* ``vcpu.<num>.halted`` - virtual CPU <num> is halted: yes or
no (may indicate the processor is idle or even disabled,
depending on the architecture)
*--interface* returns:
* ``net.count`` - number of network interfaces on this domain
* ``net.<num>.name`` - name of the interface <num>
* ``net.<num>.rx.bytes`` - number of bytes received
* ``net.<num>.rx.pkts`` - number of packets received
* ``net.<num>.rx.errs`` - number of receive errors
* ``net.<num>.rx.drop`` - number of receive packets dropped
* ``net.<num>.tx.bytes`` - number of bytes transmitted
* ``net.<num>.tx.pkts`` - number of packets transmitted
* ``net.<num>.tx.errs`` - number of transmission errors
* ``net.<num>.tx.drop`` - number of transmit packets dropped
*--perf* returns the statistics of all enabled perf events:
* ``perf.cmt`` - the cache usage in Byte currently used
* ``perf.mbmt`` - total system bandwidth from one level of cache
* ``perf.mbml`` - bandwidth of memory traffic for a memory controller
* ``perf.cpu_cycles`` - the count of cpu cycles (total/elapsed)
* ``perf.instructions`` - the count of instructions
* ``perf.cache_references`` - the count of cache hits
* ``perf.cache_misses`` - the count of caches misses
* ``perf.branch_instructions`` - the count of branch instructions
* ``perf.branch_misses`` - the count of branch misses
* ``perf.bus_cycles`` - the count of bus cycles
* ``perf.stalled_cycles_frontend`` - the count of stalled frontend
cpu cycles
* ``perf.stalled_cycles_backend`` - the count of stalled backend
cpu cycles
* ``perf.ref_cpu_cycles`` - the count of ref cpu cycles
* ``perf.cpu_clock`` - the count of cpu clock time
* ``perf.task_clock`` - the count of task clock time
* ``perf.page_faults`` - the count of page faults
* ``perf.context_switches`` - the count of context switches
* ``perf.cpu_migrations`` - the count of cpu migrations
* ``perf.page_faults_min`` - the count of minor page faults
* ``perf.page_faults_maj`` - the count of major page faults
* ``perf.alignment_faults`` - the count of alignment faults
* ``perf.emulation_faults`` - the count of emulation faults
See the ``perf`` command for more details about each event.
*--block* returns information about disks associated with each
domain. Using the *--backing* flag extends this information to
cover all resources in the backing chain, rather than the default
of limiting information to the active layer for each guest disk.
Information listed includes:
* ``block.count`` - number of block devices being listed
* ``block.<num>.name`` - name of the target of the block
device <num> (the same name for multiple entries if *--backing*
is present)
* ``block.<num>.backingIndex`` - when *--backing* is present,
matches up with the <backingStore> index listed in domain XML for
backing files
* ``block.<num>.path`` - file source of block device <num>, if
it is a local file or block device
* ``block.<num>.rd.reqs`` - number of read requests
* ``block.<num>.rd.bytes`` - number of read bytes
* ``block.<num>.rd.times`` - total time (ns) spent on reads
* ``block.<num>.wr.reqs`` - number of write requests
* ``block.<num>.wr.bytes`` - number of written bytes
* ``block.<num>.wr.times`` - total time (ns) spent on writes
* ``block.<num>.fl.reqs`` - total flush requests
* ``block.<num>.fl.times`` - total time (ns) spent on cache flushing
* ``block.<num>.errors`` - Xen only: the 'oo_req' value
* ``block.<num>.allocation`` - offset of highest written sector in bytes
* ``block.<num>.capacity`` - logical size of source file in bytes
* ``block.<num>.physical`` - physical size of source file in bytes
* ``block.<num>.threshold`` - threshold (in bytes) for delivering the
VIR_DOMAIN_EVENT_ID_BLOCK_THRESHOLD event. See domblkthreshold.
*--iothread* returns information about IOThreads on the running guest
if supported by the hypervisor.
The "poll-max-ns" for each thread is the maximum nanoseconds to allow
each polling interval to occur. A polling interval is a period of time
allowed for a thread to process data before being the guest gives up
its CPU quantum back to the host. A value set too small will not allow
the IOThread to run long enough on a CPU to process data. A value set
too high will consume too much CPU time per IOThread failing to allow
other threads running on the CPU to get time. The polling interval is
not available for statistical purposes.
* ``iothread.count`` - maximum number of IOThreads in the subsequent list
as unsigned int. Each IOThread in the list will
will use it's iothread_id value as the <id>. There
may be fewer <id> entries than the iothread.count
value if the polling values are not supported.
* ``iothread.<id>.poll-max-ns`` - maximum polling time in nanoseconds used
by the <id> IOThread. A value of 0 (zero) indicates polling is disabled.
* ``iothread.<id>.poll-grow`` - polling time grow value. A value of 0 (zero)
growth is managed by the hypervisor.
* ``iothread.<id>.poll-shrink`` - polling time shrink value. A value of
(zero) indicates shrink is managed by hypervisor.
*--memory* returns:
* ``memory.bandwidth.monitor.count`` - the number of memory bandwidth
monitors for this domain
* ``memory.bandwidth.monitor.<num>.name`` - the name of monitor <num>
* ``memory.bandwidth.monitor.<num>.vcpus`` - the vcpu list of monitor <num>
* ``memory.bandwidth.monitor.<num>.node.count`` - the number of memory
controller in monitor <num>
* ``memory.bandwidth.monitor.<num>.node.<index>.id`` - host allocated memory
controller id for controller <index> of monitor <num>
* ``memory.bandwidth.monitor.<num>.node.<index>.bytes.local`` - the accumulative
bytes consumed by @vcpus that passing through the memory controller in the
same processor that the scheduled host CPU belongs to.
* ``memory.bandwidth.monitor.<num>.node.<index>.bytes.total`` - the total
bytes consumed by @vcpus that passing through all memory controllers, either
local or remote controller.
Selecting a specific statistics groups doesn't guarantee that the
daemon supports the selected group of stats. Flag *--enforce*
forces the command to fail if the daemon doesn't support the
selected group.
When collecting stats libvirtd may wait for some time if there's
already another job running on given domain for it to finish.
This may cause unnecessary delay in delivering stats. Using
*--nowait* suppresses this behaviour. On the other hand
some statistics might be missing for such domain.
domtime
-------
**Syntax:**
::
domtime domain { [--now] [--pretty] [--sync] [--time time] }
Gets or sets the domain's system time. When run without any arguments
(but *domain*), the current domain's system time is printed out. The
*--pretty* modifier can be used to print the time in more human
readable form.
When *--time* ``time`` is specified, the domain's time is
not gotten but set instead. The *--now* modifier acts like if it was
an alias for *--time* ``$now``, which means it sets the time that is
currently on the host virsh is running at. In both cases (setting and
getting), time is in seconds relative to Epoch of 1970-01-01 in UTC.
The *--sync* modifies the set behavior a bit: The time passed is
ignored, but the time to set is read from domain's RTC instead. Please
note, that some hypervisors may require a guest agent to be configured
in order to get or set the guest time.
domuuid
-------
**Syntax:**
::
domuuid domain-name-or-id
Convert a domain name or id to domain UUID
domxml-from-native
------------------
**Syntax:**
::
domxml-from-native format config
Convert the file *config* in the native guest configuration format
named by *format* to a domain XML format. For QEMU/KVM hypervisor,
the *format* argument must be ``qemu-argv``. For Xen hypervisor, the
*format* argument may be ``xen-xm``, ``xen-xl``, or ``xen-sxpr``. For
LXC hypervisor, the *format* argument must be ``lxc-tools``. For
VMware/ESX hypervisor, the *format* argument must be ``vmware-vmx``.
For the Bhyve hypervisor, the *format* argument must be ``bhyve-argv``.
domxml-to-native
----------------
**Syntax:**
::
domxml-to-native format { [--xml] xml | --domain domain-name-or-id-or-uuid }
Convert the file *xml* into domain XML format or convert an existing
*--domain* to the native guest configuration format named by *format*.
The *xml* and *--domain* arguments are mutually exclusive. For the types
of *format* argument, refer to ``domxml-from-native``.
dump
----
**Syntax:**
::
dump domain corefilepath [--bypass-cache]
{ [--live] | [--crash] | [--reset] }
[--verbose] [--memory-only] [--format string]
Dumps the core of a domain to a file for analysis.
If *--live* is specified, the domain continues to run until the core
dump is complete, rather than pausing up front.
If *--crash* is specified, the domain is halted with a crashed status,
rather than merely left in a paused state.
If *--reset* is specified, the domain is reset after successful dump.
Note, these three switches are mutually exclusive.
If *--bypass-cache* is specified, the save will avoid the file system
cache, although this may slow down the operation.
If *--memory-only* is specified, the file is elf file, and will only
include domain's memory and cpu common register value. It is very
useful if the domain uses host devices directly.
*--format* *string* is used to specify the format of 'memory-only'
dump, and *string* can be one of them: elf, kdump-zlib(kdump-compressed
format with zlib-compressed), kdump-lzo(kdump-compressed format with
lzo-compressed), kdump-snappy(kdump-compressed format with snappy-compressed).
The progress may be monitored using ``domjobinfo`` virsh command and canceled
with ``domjobabort`` command (sent by another virsh instance). Another option
is to send SIGINT (usually with ``Ctrl-C``) to the virsh process running
``dump`` command. *--verbose* displays the progress of dump.
NOTE: Some hypervisors may require the user to manually ensure proper
permissions on file and path specified by argument *corefilepath*.
NOTE: Crash dump in a old kvmdump format is being obsolete and cannot be loaded
and processed by crash utility since its version 6.1.0. A --memory-only option
is required in order to produce valid ELF file which can be later processed by
the crash utility.
dumpxml
-------
**Syntax:**
::
dumpxml domain [--inactive] [--security-info] [--update-cpu] [--migratable]
Output the domain information as an XML dump to stdout, this format can be used
by the ``create`` command. Additional options affecting the XML dump may be
used. *--inactive* tells virsh to dump domain configuration that will be used
on next start of the domain as opposed to the current domain configuration.
Using *--security-info* will also include security sensitive information
in the XML dump. *--update-cpu* updates domain CPU requirements according to
host CPU. With *--migratable* one can request an XML that is suitable for
migrations, i.e., compatible with older libvirt releases and possibly amended
with internal run-time options. This option may automatically enable other
options (*--update-cpu*, *--security-info*, ...) as necessary.
edit
----
**Syntax:**
::
edit domain
Edit the XML configuration file for a domain, which will affect the
next boot of the guest.
This is equivalent to:
::
virsh dumpxml --inactive --security-info domain > domain.xml
vi domain.xml (or make changes with your other text editor)
virsh define domain.xml
except that it does some error checking.
The editor used can be supplied by the ``$VISUAL`` or ``$EDITOR`` environment
variables, and defaults to ``vi``.
emulatorpin
-----------
**Syntax:**
::
emulatorpin domain [cpulist] [[--live] [--config] | [--current]]
Query or change the pinning of domain's emulator threads to host physical
CPUs.
See ``vcpupin`` for *cpulist*.
If *--live* is specified, affect a running guest.
If *--config* is specified, affect the next start of a persistent guest.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest.
Both *--live* and *--config* flags may be given if *cpulist* is present,
but *--current* is exclusive.
If no flag is specified, behavior is different depending on hypervisor.
event
-----
**Syntax:**
::
event {[domain] { event | --all } [--loop] [--timeout seconds] [--timestamp] | --list}
Wait for a class of domain events to occur, and print appropriate details
of events as they happen. The events can optionally be filtered by
*domain*. Using *--list* as the only argument will provide a list
of possible *event* values known by this client, although the connection
might not allow registering for all these events. It is also possible
to use *--all* instead of *event* to register for all possible event
types at once.
By default, this command is one-shot, and returns success once an event
occurs; you can send SIGINT (usually via ``Ctrl-C``) to quit immediately.
If *--timeout* is specified, the command gives up waiting for events
after *seconds* have elapsed. With *--loop*, the command prints all
events until a timeout or interrupt key.
When *--timestamp* is used, a human-readable timestamp will be printed
before the event.
guest-agent-timeout
-------------------
**Syntax:**
::
guest-agent-timeout domain [--timeout value]
Set how long to wait for a response from guest agent commands. By default,
agent commands block forever waiting for a response. ``value`` must be a
positive value (wait for given amount of seconds) or one of the following
values:
* -2 - block forever waiting for a result (used when --timeout is omitted),
* -1 - reset timeout to the default value (currently defined as 5 seconds in
libvirt daemon),
* 0 - do not wait at all,
guestinfo
---------
**Syntax:**
::
guestinfo domain [--user] [--os] [--timezone] [--hostname] [--filesystem]
Print information about the guest from the point of view of the guest agent.
Note that this command requires a guest agent to be configured and running in
the domain's guest OS.
When run without any arguments, this command prints all information types that
are supported by the guest agent. You can limit the types of information that
are returned by specifying one or more flags. If a requested information
type is not supported, the processes will provide an exit code of 1.
Available information types flags are *--user*, *--os*,
*--timezone*, *--hostname*, and *--filesystem*.
Note that depending on the hypervisor type and the version of the guest agent
running within the domain, not all of the following information may be
returned.
When selecting the *--user* information type, the following fields may be
returned:
* ``user.count`` - the number of active users on this domain
* ``user.<num>.name`` - username of user <num>
* ``user.<num>.domain`` - domain of the user <num> (may only be present on certain
guets types)
* ``user.<num>.login-time`` - the login time of user <num> in milliseconds since
the epoch
*--os* returns:
* ``os.id`` - a string identifying the operating system
* ``os.name`` - the name of the operating system
* ``os.pretty-name`` - a pretty name for the operating system
* ``os.version`` - the version of the operating system
* ``os.version-id`` - the version id of the operating system
* ``os.kernel-release`` - the release of the operating system kernel
* ``os.kernel-version`` - the version of the operating system kernel
* ``os.machine`` - the machine hardware name
* ``os.variant`` - a specific variant or edition of the operating system
* ``os.variant-id`` - the id for a specific variant or edition of the operating
system
*--timezone* returns:
* ``timezone.name`` - the name of the timezone
* ``timezone.offset`` - the offset to UTC in seconds
*--hostname* returns:
* ``hostname`` - the hostname of the domain
*--filesystem* returns:
* ``fs.count`` - the number of filesystems defined on this domain
* ``fs.<num>.mountpoint`` - the path to the mount point for filesystem <num>
* ``fs.<num>.name`` - device name in the guest (e.g. ``sda1``) for filesystem <num>
* ``fs.<num>.fstype`` - the type of filesystem <num>
* ``fs.<num>.total-bytes`` - the total size of filesystem <num>
* ``fs.<num>.used-bytes`` - the number of bytes used in filesystem <num>
* ``fs.<num>.disk.count`` - the number of disks targeted by filesystem <num>
* ``fs.<num>.disk.<num>.alias`` - the device alias of disk <num> (e.g. sda)
* ``fs.<num>.disk.<num>.serial`` - the serial number of disk <num>
* ``fs.<num>.disk.<num>.device`` - the device node of disk <num>
guestvcpus
----------
**Syntax:**
::
guestvcpus domain [[--enable] | [--disable]] [cpulist]
Query or change state of vCPUs from guest's point of view using the guest agent.
When invoked without *cpulist* the guest is queried for available guest vCPUs,
their state and possibility to be offlined.
If *cpulist* is provided then one of *--enable* or *--disable* must be
provided too. The desired operation is then executed on the domain.
See ``vcpupin`` for information on *cpulist*.
iothreadadd
-----------
**Syntax:**
::
iothreadadd domain iothread_id [[--config] [--live] | [--current]]
Add a new IOThread to the domain using the specified *iothread_id*.
If the *iothread_id* already exists, the command will fail. The
*iothread_id* must be greater than zero.
If *--live* is specified, affect a running guest. If the guest is not
running an error is returned.
If *--config* is specified, affect the next start of a persistent guest.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest.
iothreaddel
-----------
**Syntax:**
::
iothreaddel domain iothread_id [[--config] [--live] | [--current]]
Delete an IOThread from the domain using the specified *iothread_id*.
If an IOThread is currently assigned to a disk resource such as via the
``attach-disk`` command, then the attempt to remove the IOThread will fail.
If the *iothread_id* does not exist an error will occur.
If *--live* is specified, affect a running guest. If the guest is not
running an error is returned.
If *--config* is specified, affect the next start of a persistent guest.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest.
iothreadinfo
------------
**Syntax:**
::
iothreadinfo domain [[--live] [--config] | [--current]]
Display basic domain IOThreads information including the IOThread ID and
the CPU Affinity for each IOThread.
If *--live* is specified, get the IOThreads data from the running guest. If
the guest is not running, an error is returned.
If *--config* is specified, get the IOThreads data from the next start of
a persistent guest.
If *--current* is specified or *--live* and *--config* are not specified,
then get the IOThread data based on the current guest state, which can
either be live or offline.
iothreadpin
-----------
**Syntax:**
::
iothreadpin domain iothread cpulist [[--live] [--config] | [--current]]
Change the pinning of a domain IOThread to host physical CPUs. In order
to retrieve a list of all IOThreads, use ``iothreadinfo``. To pin an
*iothread* specify the *cpulist* desired for the IOThread ID as listed
in the ``iothreadinfo`` output.
*cpulist* is a list of physical CPU numbers. Its syntax is a comma
separated list and a special markup using '-' and '^' (ex. '0-4', '0-3,^2') can
also be allowed. The '-' denotes the range and the '^' denotes exclusive.
If you want to reset iothreadpin setting, that is, to pin an *iothread*
to all physical cpus, simply specify 'r' as a *cpulist*.
If *--live* is specified, affect a running guest. If the guest is not running,
an error is returned.
If *--config* is specified, affect the next start of a persistent guest.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest.
Both *--live* and *--config* flags may be given if *cpulist* is present,
but *--current* is exclusive.
If no flag is specified, behavior is different depending on hypervisor.
``Note``: The expression is sequentially evaluated, so "0-15,^8" is
identical to "9-14,0-7,15" but not identical to "^8,0-15".
iothreadset
-----------
**Syntax:**
::
iothreadset domain iothread_id [[--poll-max-ns ns] [--poll-grow factor]
[--poll-shrink divisor]]
[[--config] [--live] | [--current]]
Modifies an existing iothread of the domain using the specified
*iothread_id*. The *--poll-max-ns* provides the maximum polling
interval to be allowed for an IOThread in ns. If a 0 (zero) is provided,
then polling for the IOThread is disabled. The *--poll-grow* is the
factor by which the current polling time will be adjusted in order to
reach the maximum polling time. If a 0 (zero) is provided, then the
default factor will be used. The *--poll-shrink* is the quotient
by which the current polling time will be reduced in order to get
below the maximum polling interval. If a 0 (zero) is provided, then
the default quotient will be used. The polling values are purely dynamic
for a running guest. Saving, destroying, stopping, etc. the guest will
result in the polling values returning to hypervisor defaults at the
next start, restore, etc.
If *--live* is specified, affect a running guest. If the guest is not
running an error is returned.
If *--current* is specified or *--live* is not specified, then handle
as if *--live* was specified. (Where "current" here means whatever the
present guest state is: live or offline.)
managedsave
-----------
**Syntax:**
::
managedsave domain [--bypass-cache] [{--running | --paused}] [--verbose]
Save and destroy (stop) a running domain, so it can be restarted from the same
state at a later time. When the virsh ``start`` command is next run for
the domain, it will automatically be started from this saved state.
If *--bypass-cache* is specified, the save will avoid the file system
cache, although this may slow down the operation.
The progress may be monitored using ``domjobinfo`` virsh command and canceled
with ``domjobabort`` command (sent by another virsh instance). Another option
is to send SIGINT (usually with ``Ctrl-C``) to the virsh process running
``managedsave`` command. *--verbose* displays the progress of save.
Normally, starting a managed save will decide between running or paused
based on the state the domain was in when the save was done; passing
either the *--running* or *--paused* flag will allow overriding which
state the ``start`` should use.
The ``dominfo`` command can be used to query whether a domain currently
has any managed save image.
managedsave-define
------------------
**Syntax:**
::
managedsave-define domain xml [{--running | --paused}]
Update the domain XML that will be used when *domain* is later
started. The *xml* argument must be a file name containing
the alternative XML, with changes only in the host-specific portions of
the domain XML. For example, it can be used to change disk file paths.
The managed save image records whether the domain should be started to a
running or paused state. Normally, this command does not alter the
recorded state; passing either the *--running* or *--paused* flag
will allow overriding which state the ``start`` should use.
managedsave-dumpxml
-------------------
**Syntax:**
::
managedsave-dumpxml domain [--security-info]
Extract the domain XML that was in effect at the time the saved state
file *file* was created with the ``managedsave`` command. Using
*--security-info* will also include security sensitive information.
managedsave-edit
----------------
**Syntax:**
::
managedsave-edit domain [{--running | --paused}]
Edit the XML configuration associated with a saved state file of a
*domain* was created by the ``managedsave`` command.
The managed save image records whether the domain should be started to a
running or paused state. Normally, this command does not alter the
recorded state; passing either the *--running* or *--paused* flag
will allow overriding which state the ``restore`` should use.
This is equivalent to:
::
virsh managedsave-dumpxml domain-name > state-file.xml
vi state-file.xml (or make changes with your other text editor)
virsh managedsave-define domain-name state-file-xml
except that it does some error checking.
The editor used can be supplied by the ``$VISUAL`` or ``$EDITOR`` environment
variables, and defaults to ``vi``.
managedsave-remove
------------------
**Syntax:**
::
managedsave-remove domain
Remove the ``managedsave`` state file for a domain, if it exists. This
ensures the domain will do a full boot the next time it is started.
maxvcpus
--------
**Syntax:**
::
maxvcpus [type]
Provide the maximum number of virtual CPUs supported for a guest VM on
this connection. If provided, the *type* parameter must be a valid
type attribute for the <domain> element of XML.
memtune
-------
**Syntax:**
::
memtune domain [--hard-limit size] [--soft-limit size] [--swap-hard-limit size]
[--min-guarantee size] [[--config] [--live] | [--current]]
Allows you to display or set the domain memory parameters. Without
flags, the current settings are displayed; with a flag, the
appropriate limit is adjusted if supported by the hypervisor. LXC and
QEMU/KVM support *--hard-limit*, *--soft-limit*, and *--swap-hard-limit*.
*--min-guarantee* is supported only by ESX hypervisor. Each of these
limits are scaled integers (see ``NOTES`` above), with a default of
kibibytes (blocks of 1024 bytes) if no suffix is present. Libvirt rounds
up to the nearest kibibyte. Some hypervisors require a larger granularity
than KiB, and requests that are not an even multiple will be rounded up.
For example, vSphere/ESX rounds the parameter up to mebibytes (1024 kibibytes).
If *--live* is specified, affect a running guest.
If *--config* is specified, affect the next start of a persistent guest.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest.
Both *--live* and *--config* flags may be given, but *--current* is
exclusive. If no flag is specified, behavior is different depending
on hypervisor.
For QEMU/KVM, the parameters are applied to the QEMU process as a whole.
Thus, when counting them, one needs to add up guest RAM, guest video RAM, and
some memory overhead of QEMU itself. The last piece is hard to determine so
one needs guess and try.
For LXC, the displayed hard_limit value is the current memory setting
from the XML or the results from a ``virsh setmem`` command.
- *--hard-limit*
The maximum memory the guest can use.
- *--soft-limit*
The memory limit to enforce during memory contention.
- *--swap-hard-limit*
The maximum memory plus swap the guest can use. This has to be more
than hard-limit value provided.
- *--min-guarantee*
The guaranteed minimum memory allocation for the guest.
Specifying -1 as a value for these limits is interpreted as unlimited.
metadata
--------
**Syntax:**
::
metadata domain [[--live] [--config] | [--current]]
[--edit] [uri] [key] [set] [--remove]
Show or modify custom XML metadata of a domain. The metadata is a user
defined XML that allows storing arbitrary XML data in the domain definition.
Multiple separate custom metadata pieces can be stored in the domain XML.
The pieces are identified by a private XML namespace provided via the
*uri* argument. (See also ``desc`` that works with textual metadata of
a domain.)
Flags *--live* or *--config* select whether this command works on live
or persistent definitions of the domain. If both *--live* and *--config*
are specified, the *--config* option takes precedence on getting the current
description and both live configuration and config are updated while setting
the description. *--current* is exclusive and implied if none of these was
specified.
Flag *--remove* specifies that the metadata element specified by the *uri*
argument should be removed rather than updated.
Flag *--edit* specifies that an editor with the metadata identified by the
*uri* argument should be opened and the contents saved back afterwards.
Otherwise the new contents can be provided via the *set* argument.
When setting metadata via *--edit* or *set* the *key* argument must be
specified and is used to prefix the custom elements to bind them
to the private namespace.
If neither of *--edit* and *set* are specified the XML metadata corresponding
to the *uri* namespace is displayed instead of being modified.
migrate
-------
**Syntax:**
::
migrate [--live] [--offline] [--direct] [--p2p [--tunnelled]]
[--persistent] [--undefinesource] [--suspend] [--copy-storage-all]
[--copy-storage-inc] [--change-protection] [--unsafe] [--verbose]
[--rdma-pin-all] [--abort-on-error] [--postcopy] [--postcopy-after-precopy]
domain desturi [migrateuri] [graphicsuri] [listen-address] [dname]
[--timeout seconds [--timeout-suspend | --timeout-postcopy]]
[--xml file] [--migrate-disks disk-list] [--disks-port port]
[--compressed] [--comp-methods method-list]
[--comp-mt-level] [--comp-mt-threads] [--comp-mt-dthreads]
[--comp-xbzrle-cache] [--auto-converge] [auto-converge-initial]
[auto-converge-increment] [--persistent-xml file] [--tls]
[--postcopy-bandwidth bandwidth]
[--parallel [--parallel-connections connections]]
[--bandwidth bandwidth] [--tls-destination hostname]
[--disks-uri URI]
Migrate domain to another host. Add *--live* for live migration; <--p2p>
for peer-2-peer migration; *--direct* for direct migration; or *--tunnelled*
for tunnelled migration. *--offline* migrates domain definition without
starting the domain on destination and without stopping it on source host.
Offline migration may be used with inactive domains and it must be used with
*--persistent* option. *--persistent* leaves the domain persistent on
destination host, *--undefinesource* undefines the domain on the source host,
and *--suspend* leaves the domain paused on the destination host.
*--copy-storage-all* indicates migration with non-shared storage with full
disk copy, *--copy-storage-inc* indicates migration with non-shared storage
with incremental copy (same base image shared between source and destination).
In both cases the disk images have to exist on destination host, the
*--copy-storage-...* options only tell libvirt to transfer data from the
images on source host to the images found at the same place on the destination
host. By default only non-shared non-readonly images are transferred. Use
*--migrate-disks* to explicitly specify a list of disk targets to
transfer via the comma separated ``disk-list`` argument. *--change-protection*
enforces that no incompatible configuration changes will be made to the domain
while the migration is underway; this flag is implicitly enabled when supported
by the hypervisor, but can be explicitly used to reject the migration if the
hypervisor lacks change protection support. *--verbose* displays the progress
of migration. *--abort-on-error* cancels
the migration if a soft error (for example I/O error) happens during the
migration. *--postcopy* enables post-copy logic in migration, but does not
actually start post-copy, i.e., migration is started in pre-copy mode.
Once migration is running, the user may switch to post-copy using the
``migrate-postcopy`` command sent from another virsh instance or use
*--postcopy-after-precopy* along with *--postcopy* to let libvirt
automatically switch to post-copy after the first pass of pre-copy is finished.
The maximum bandwidth consumed during the post-copy phase may be limited using
*--postcopy-bandwidth*. The maximum bandwidth consumed during the pre-copy phase
may be limited using *--bandwidth*.
*--auto-converge* forces convergence during live migration. The initial
guest CPU throttling rate can be set with *auto-converge-initial*. If the
initial throttling rate is not enough to ensure convergence, the rate is
periodically increased by *auto-converge-increment*.
*--rdma-pin-all* can be used with RDMA migration (i.e., when *migrateuri*
starts with rdma://) to tell the hypervisor to pin all domain's memory at once
before migration starts rather than letting it pin memory pages as needed. For
QEMU/KVM this requires hard_limit memory tuning element (in the domain XML) to
be used and set to the maximum memory configured for the domain plus any memory
consumed by the QEMU process itself. Beware of setting the memory limit too
high (and thus allowing the domain to lock most of the host's memory). Doing so
may be dangerous to both the domain and the host itself since the host's kernel
may run out of memory.
``Note``: Individual hypervisors usually do not support all possible types of
migration. For example, QEMU does not support direct migration.
In some cases libvirt may refuse to migrate the domain because doing so may
lead to potential problems such as data corruption, and thus the migration is
considered unsafe. For QEMU domain, this may happen if the domain uses disks
without explicitly setting cache mode to "none". Migrating such domains is
unsafe unless the disk images are stored on coherent clustered filesystem,
such as GFS2 or GPFS. If you are sure the migration is safe or you just do not
care, use *--unsafe* to force the migration.
*dname* is used for renaming the domain to new name during migration, which
also usually can be omitted. Likewise, *--xml* ``file`` is usually
omitted, but can be used to supply an alternative XML file for use on
the destination to supply a larger set of changes to any host-specific
portions of the domain XML, such as accounting for naming differences
between source and destination in accessing underlying storage.
If *--persistent* is enabled, *--persistent-xml* ``file`` can be used to
supply an alternative XML file which will be used as the persistent guest
definition on the destination host.
*--timeout* ``seconds`` tells virsh to run a specified action when live
migration exceeds that many seconds. It can only be used with *--live*.
If *--timeout-suspend* is specified, the domain will be suspended after
the timeout and the migration will complete offline; this is the default
if no *--timeout-\\`` option is specified on the command line. When
*--timeout-postcopy* is used, virsh will switch migration from pre-copy
to post-copy upon timeout; migration has to be started with *--postcopy*
option for this to work.
*--compressed* activates compression, the compression method is chosen
with *--comp-methods*. Supported methods are "mt" and "xbzrle" and
can be used in any combination. When no methods are specified, a hypervisor
default methods will be used. QEMU defaults to "xbzrle". Compression methods
can be tuned further. *--comp-mt-level* sets compression level.
Values are in range from 0 to 9, where 1 is maximum speed and 9 is maximum
compression. *--comp-mt-threads* and *--comp-mt-dthreads* set the number
of compress threads on source and the number of decompress threads on target
respectively. *--comp-xbzrle-cache* sets size of page cache in bytes.
Providing *--tls* causes the migration to use the host configured TLS setup
(see migrate_tls_x509_cert_dir in /etc/libvirt/qemu.conf) in order to perform
the migration of the domain. Usage requires proper TLS setup for both source
and target. Normally the TLS certificate from the destination host must match
the host's name for TLS verification to succeed. When the certificate does not
match the destination hostname and the expected certificate's hostname is
known, *--tls-destination* can be used to pass the expected *hostname* when
starting the migration.
*--parallel* option will cause migration data to be sent over multiple
parallel connections. The number of such connections can be set using
*--parallel-connections*. Parallel connections may help with saturating the
network link between the source and the target and thus speeding up the
migration.
Running migration can be canceled by interrupting virsh (usually using
``Ctrl-C``) or by ``domjobabort`` command sent from another virsh instance.
The *desturi* and *migrateuri* parameters can be used to control which
destination the migration uses. *desturi* is important for managed
migration, but unused for direct migration; *migrateuri* is required
for direct migration, but can usually be automatically determined for
managed migration.
``Note``: The *desturi* parameter for normal migration and peer2peer migration
has different semantics:
* normal migration: the *desturi* is an address of the target host as seen from the client machine.
* peer2peer migration: the *desturi* is an address of the target host as seen from the source machine.
In a special circumstance where you require a complete control of the connection
and/or libvirt does not have network access to the remote side you can use a
UNIX transport in the URI and specify a socket path in the query, for example
with the qemu driver you could use this:
::
qemu+unix:///system?socket=/path/to/socket
When *migrateuri* is not specified, libvirt will automatically determine the
hypervisor specific URI. Some hypervisors, including QEMU, have an optional
"migration_host" configuration parameter (useful when the host has multiple
network interfaces). If this is unspecified, libvirt determines a name
by looking up the target host's configured hostname.
There are a few scenarios where specifying *migrateuri* may help:
* The configured hostname is incorrect, or DNS is broken.
If a host has a hostname which will not resolve to match one of its public IP addresses, then
libvirt will generate an incorrect URI. In this case *migrateuri* should be
explicitly specified, using an IP address, or a correct hostname.
* The host has multiple network interfaces. If a host has multiple network
interfaces, it might be desirable for the migration data stream to be sent over
a specific interface for either security or performance reasons. In this case
*migrateuri* should be explicitly specified, using an IP address associated
with the network to be used.
* The firewall restricts what ports are available. When libvirt generates a
migration URI, it will pick a port number using hypervisor specific rules.
Some hypervisors only require a single port to be open in the firewalls, while
others require a whole range of port numbers. In the latter case *migrateuri*
might be specified to choose a specific port number outside the default range in
order to comply with local firewall policies.
* The *desturi* uses UNIX transport method. In this advanced case libvirt
should not guess a *migrateuri* and it should be specified using
UNIX socket path URI:
::
unix:///path/to/socket
See `https://libvirt.org/migration.html#uris <https://libvirt.org/migration.html#uris>`_ for more details on
migration URIs.
Optional *graphicsuri* overrides connection parameters used for automatically
reconnecting a graphical clients at the end of migration. If omitted, libvirt
will compute the parameters based on target host IP address. In case the
client does not have a direct access to the network virtualization hosts are
connected to and needs to connect through a proxy, *graphicsuri* may be used
to specify the address the client should connect to. The URI is formed as
follows:
::
protocol://hostname[:port]/[?parameters]
where protocol is either "spice" or "vnc" and parameters is a list of protocol
specific parameters separated by '&'. Currently recognized parameters are
"tlsPort" and "tlsSubject". For example,
::
spice://target.host.com:1234/?tlsPort=4567
Optional *listen-address* sets the listen address that hypervisor on the
destination side should bind to for incoming migration. Both IPv4 and IPv6
addresses are accepted as well as hostnames (the resolving is done on
destination). Some hypervisors do not support specifying the listen address and
will return an error if this parameter is used. This parameter cannot be used if
*desturi* uses UNIX transport method.
Optional *disks-port* sets the port that hypervisor on destination side should
bind to for incoming disks traffic. Currently it is supported only by QEMU.
Optional *disks-uri* can also be specified (mutually exclusive with
*disks-port*) to specify what the remote hypervisor should bind/connect to when
migrating disks. This can be *tcp://address:port* to specify a listen address
(which overrides *--listen-address* for the disk migration) and a port or
*unix:///path/to/socket* in case you need the disk migration to happen over a
UNIX socket with that specified path. In this case you need to make sure the
same socket path is accessible to both source and destination hypervisors and
connecting to the socket on the source (after hypervisor creates it on the
destination) will actually connect to the destination.
migrate-compcache
-----------------
**Syntax:**
::
migrate-compcache domain [--size bytes]
Sets and/or gets size of the cache (in bytes) used for compressing repeatedly
transferred memory pages during live migration. When called without *size*,
the command just prints current size of the compression cache. When *size*
is specified, the hypervisor is asked to change compression cache to *size*
bytes and then the current size is printed (the result may differ from the
requested size due to rounding done by the hypervisor). The *size* option
is supposed to be used while the domain is being live-migrated as a reaction
to migration progress and increasing number of compression cache misses
obtained from domjobinfo.
migrate-getmaxdowntime
----------------------
**Syntax:**
::
migrate-getmaxdowntime domain
Get the maximum tolerable downtime for a domain which is being live-migrated to
another host. This is the number of milliseconds the guest is allowed
to be down at the end of live migration.
migrate-getspeed
----------------
**Syntax:**
::
migrate-getspeed domain [--postcopy]
Get the maximum migration bandwidth (in MiB/s) for a domain. If the
*--postcopy* option is specified, the command will get the maximum bandwidth
allowed during a post-copy migration phase.
migrate-postcopy
----------------
**Syntax:**
::
migrate-postcopy domain
Switch the current migration from pre-copy to post-copy. This is only
supported for a migration started with *--postcopy* option.
migrate-setmaxdowntime
----------------------
**Syntax:**
::
migrate-setmaxdowntime domain downtime
Set maximum tolerable downtime for a domain which is being live-migrated to
another host. The *downtime* is a number of milliseconds the guest is allowed
to be down at the end of live migration.
migrate-setspeed
----------------
**Syntax:**
::
migrate-setspeed domain bandwidth [--postcopy]
Set the maximum migration bandwidth (in MiB/s) for a domain which is being
migrated to another host. *bandwidth* is interpreted as an unsigned long
long value. Specifying a negative value results in an essentially unlimited
value being provided to the hypervisor. The hypervisor can choose whether to
reject the value or convert it to the maximum value allowed. If the
*--postcopy* option is specified, the command will set the maximum bandwidth
allowed during a post-copy migration phase.
numatune
--------
**Syntax:**
::
numatune domain [--mode mode] [--nodeset nodeset]
[[--config] [--live] | [--current]]
Set or get a domain's numa parameters, corresponding to the <numatune>
element of domain XML. Without flags, the current settings are
displayed.
*mode* can be one of \`strict', \`interleave' and \`preferred' or any
valid number from the virDomainNumatuneMemMode enum in case the daemon
supports it. For a running domain, the mode can't be changed, and the
nodeset can be changed only if the domain was started with a mode of
\`strict'.
*nodeset* is a list of numa nodes used by the host for running the domain.
Its syntax is a comma separated list, with '-' for ranges and '^' for
excluding a node.
If *--live* is specified, set scheduler information of a running guest.
If *--config* is specified, affect the next start of a persistent guest.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest.
For running guests in Linux hosts, the changes made in the domain's
numa parameters does not imply that the guest memory will be moved to a
different nodeset immediately. The memory migration depends on the
guest activity, and the memory of an idle guest will remain in its
previous nodeset for longer. The presence of VFIO devices will also
lock parts of the guest memory in the same nodeset used to start the
guest, regardless of nodeset changes.
perf
----
**Syntax:**
::
perf domain [--enable eventSpec] [--disable eventSpec]
[[--config] [--live] | [--current]]
Get the current perf events setting or enable/disable specific perf
events for a guest domain.
Perf is a performance analyzing tool in Linux, and it can instrument
CPU performance counters, tracepoints, kprobes, and uprobes (dynamic
tracing). Perf supports a list of measurable events, and can measure
events coming from different sources. For instance, some event are
pure kernel counters, in this case they are called software events,
including context-switches, minor-faults, etc.. Now dozens of events
from different sources can be supported by perf.
Currently only QEMU/KVM supports this command. The *--enable* and *--disable*
option combined with ``eventSpec`` can be used to enable or disable specific
performance event. ``eventSpec`` is a string list of one or more events
separated by commas. Valid event names are as follows:
**Valid perf event names**
* ``cmt`` - A PQos (Platform Qos) feature to monitor the
usage of cache by applications running on the platform.
* ``mbmt`` - Provides a way to monitor the total system
memory bandwidth between one level of cache and another.
* ``mbml`` - Provides a way to limit the amount of data
(bytes/s) send through the memory controller on the socket.
* ``cache_misses`` - Provides the count of cache misses by
applications running on the platform.
* ``cache_references`` - Provides the count of cache hits by
applications running on th e platform.
* ``instructions`` - Provides the count of instructions executed
by applications running on the platform.
* ``cpu_cycles`` - Provides the count of cpu cycles
(total/elapsed). May be used with instructions in order to get
a cycles per instruction.
* ``branch_instructions`` - Provides the count of branch instructions
executed by applications running on the platform.
* ``branch_misses`` - Provides the count of branch misses executed
by applications running on the platform.
* ``bus_cycles`` - Provides the count of bus cycles executed
by applications running on the platform.
* ``stalled_cycles_frontend`` - Provides the count of stalled cpu
cycles in the frontend of the instruction processor pipeline by
applications running on the platform.
* ``stalled_cycles_backend`` - Provides the count of stalled cpu
cycles in the backend of the instruction processor pipeline by
applications running on the platform.
* ``ref_cpu_cycles`` - Provides the count of total cpu cycles
not affected by CPU frequency scaling by applications running
on the platform.
* ``cpu_clock`` - Provides the cpu clock time consumed by
applications running on the platform.
* ``task_clock`` - Provides the task clock time consumed by
applications running on the platform.
* ``page_faults`` - Provides the count of page faults by
applications running on the platform.
* ``context_switches`` - Provides the count of context switches
by applications running on the platform.
* ``cpu_migrations`` - Provides the count cpu migrations by
applications running on the platform.
* ``page_faults_min`` - Provides the count minor page faults
by applications running on the platform.
* ``page_faults_maj`` - Provides the count major page faults
by applications running on the platform.
* ``alignment_faults`` - Provides the count alignment faults
by applications running on the platform.
* ``emulation_faults`` - Provides the count emulation faults
by applications running on the platform.
``Note``: The statistics can be retrieved using the ``domstats`` command using
the *--perf* flag.
If *--live* is specified, affect a running guest.
If *--config* is specified, affect the next start of a persistent guest.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest.
Both *--live* and *--config* flags may be given, but *--current* is
exclusive. If no flag is specified, behavior is different depending
on hypervisor.
reboot
------
**Syntax:**
::
reboot domain [--mode MODE-LIST]
Reboot a domain. This acts just as if the domain had the ``reboot``
command run from the console. The command returns as soon as it has
executed the reboot action, which may be significantly before the
domain actually reboots.
The exact behavior of a domain when it reboots is set by the
*on_reboot* parameter in the domain's XML definition.
By default the hypervisor will try to pick a suitable shutdown
method. To specify an alternative method, the *--mode* parameter
can specify a comma separated list which includes ``acpi``, ``agent``,
``initctl``, ``signal`` and ``paravirt``. The order in which drivers will
try each mode is undefined, and not related to the order specified to virsh.
For strict control over ordering, use a single mode at a time and
repeat the command.
reset
-----
**Syntax:**
::
reset domain
Reset a domain immediately without any guest shutdown. ``reset``
emulates the power reset button on a machine, where all guest
hardware sees the RST line set and reinitializes internal state.
``Note``: Reset without any guest OS shutdown risks data loss.
restore
-------
**Syntax:**
::
restore state-file [--bypass-cache] [--xml file]
[{--running | --paused}]
Restores a domain from a ``virsh save`` state file. See *save* for more info.
If *--bypass-cache* is specified, the restore will avoid the file system
cache, although this may slow down the operation.
*--xml* ``file`` is usually omitted, but can be used to supply an
alternative XML file for use on the restored guest with changes only
in the host-specific portions of the domain XML. For example, it can
be used to account for file naming differences in underlying storage
due to disk snapshots taken after the guest was saved.
Normally, restoring a saved image will use the state recorded in the
save image to decide between running or paused; passing either the
*--running* or *--paused* flag will allow overriding which state the
domain should be started in.
``Note``: To avoid corrupting file system contents within the domain, you
should not reuse the saved state file for a second ``restore`` unless you
have also reverted all storage volumes back to the same contents as when
the state file was created.
resume
------
**Syntax:**
::
resume domain
Moves a domain out of the suspended state. This will allow a previously
suspended domain to now be eligible for scheduling by the underlying
hypervisor.
save
----
**Syntax:**
::
save domain state-file [--bypass-cache] [--xml file]
[{--running | --paused}] [--verbose]
Saves a running domain (RAM, but not disk state) to a state file so that
it can be restored
later. Once saved, the domain will no longer be running on the
system, thus the memory allocated for the domain will be free for
other domains to use. ``virsh restore`` restores from this state file.
If *--bypass-cache* is specified, the save will avoid the file system
cache, although this may slow down the operation.
The progress may be monitored using ``domjobinfo`` virsh command and canceled
with ``domjobabort`` command (sent by another virsh instance). Another option
is to send SIGINT (usually with ``Ctrl-C``) to the virsh process running
``save`` command. *--verbose* displays the progress of save.
This is roughly equivalent to doing a hibernate on a running computer,
with all the same limitations. Open network connections may be
severed upon restore, as TCP timeouts may have expired.
*--xml* ``file`` is usually omitted, but can be used to supply an
alternative XML file for use on the restored guest with changes only
in the host-specific portions of the domain XML. For example, it can
be used to account for file naming differences that are planned to
be made via disk snapshots of underlying storage after the guest is saved.
Normally, restoring a saved image will decide between running or paused
based on the state the domain was in when the save was done; passing
either the *--running* or *--paused* flag will allow overriding which
state the ``restore`` should use.
Domain saved state files assume that disk images will be unchanged
between the creation and restore point. For a more complete system
restore point, where the disk state is saved alongside the memory
state, see the ``snapshot`` family of commands.
save-image-define
-----------------
**Syntax:**
::
save-image-define file xml [{--running | --paused}]
Update the domain XML that will be used when *file* is later
used in the ``restore`` command. The *xml* argument must be a file
name containing the alternative XML, with changes only in the
host-specific portions of the domain XML. For example, it can
be used to account for file naming differences resulting from creating
disk snapshots of underlying storage after the guest was saved.
The save image records whether the domain should be restored to a
running or paused state. Normally, this command does not alter the
recorded state; passing either the *--running* or *--paused* flag
will allow overriding which state the ``restore`` should use.
save-image-dumpxml
------------------
**Syntax:**
::
save-image-dumpxml file [--security-info]
Extract the domain XML that was in effect at the time the saved state
file *file* was created with the ``save`` command. Using
*--security-info* will also include security sensitive information.
save-image-edit
---------------
**Syntax:**
::
save-image-edit file [{--running | --paused}]
Edit the XML configuration associated with a saved state file *file*
created by the ``save`` command.
The save image records whether the domain should be restored to a
running or paused state. Normally, this command does not alter the
recorded state; passing either the *--running* or *--paused* flag
will allow overriding which state the ``restore`` should use.
This is equivalent to:
::
virsh save-image-dumpxml state-file > state-file.xml
vi state-file.xml (or make changes with your other text editor)
virsh save-image-define state-file state-file-xml
except that it does some error checking.
The editor used can be supplied by the ``$VISUAL`` or ``$EDITOR`` environment
variables, and defaults to ``vi``.
schedinfo
---------
**Syntax:**
::
schedinfo domain [[--config] [--live] | [--current]] [[--set] parameter=value]...
schedinfo [--weight number] [--cap number] domain
Allows you to show (and set) the domain scheduler parameters. The parameters
available for each hypervisor are:
LXC (posix scheduler) : cpu_shares, vcpu_period, vcpu_quota
QEMU/KVM (posix scheduler): cpu_shares, vcpu_period, vcpu_quota,
emulator_period, emulator_quota, global_period, global_quota,
iothread_period, iothread_quota
Xen (credit scheduler): weight, cap
ESX (allocation scheduler): reservation, limit, shares
If *--live* is specified, set scheduler information of a running guest.
If *--config* is specified, affect the next start of a persistent guest.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest.
``Note``: The cpu_shares parameter has a valid value range of 0-262144; Negative
values are wrapped to positive, and larger values are capped at the maximum.
Therefore, -1 is a useful shorthand for 262144. On the Linux kernel, the
values 0 and 1 are automatically converted to a minimal value of 2.
``Note``: The weight and cap parameters are defined only for the
XEN_CREDIT scheduler.
``Note``: The vcpu_period, emulator_period, and iothread_period parameters
have a valid value range of 1000-1000000 or 0, and the vcpu_quota,
emulator_quota, and iothread_quota parameters have a valid value range of
1000-18446744073709551 or less than 0. The value 0 for
either parameter is the same as not specifying that parameter.
screenshot
----------
**Syntax:**
::
screenshot domain [imagefilepath] [--screen screenID]
Takes a screenshot of a current domain console and stores it into a file.
Optionally, if the hypervisor supports more displays for a domain, *screenID*
allows specifying which screen will be captured. It is the sequential number
of screen. In case of multiple graphics cards, heads are enumerated before
devices, e.g. having two graphics cards, both with four heads, screen ID 5
addresses the second head on the second card.
send-key
--------
**Syntax:**
::
send-key domain [--codeset codeset] [--holdtime holdtime] keycode...
Parse the *keycode* sequence as keystrokes to send to *domain*.
Each *keycode* can either be a numeric value or a symbolic name from
the corresponding codeset. If *--holdtime* is given, each keystroke
will be held for that many milliseconds. The default codeset is
``linux``, but use of the *--codeset* option allows other codesets to
be chosen.
If multiple keycodes are specified, they are all sent simultaneously
to the guest, and they may be received in random order. If you need
distinct keypresses, you must use multiple send-key invocations.
- ``linux``
The numeric values are those defined by the Linux generic input
event subsystem. The symbolic names match the corresponding
Linux key constant macro names.
See virkeycode-linux(7) and virkeyname-linux(7)
- ``xt``
The numeric values are those defined by the original XT keyboard
controller. No symbolic names are provided
See virkeycode-xt(7)
- ``atset1``
The numeric values are those defined by the AT keyboard controller,
set 1 (aka XT compatible set). Extended keycoes from ``atset1``
may differ from extended keycodes in the ``xt`` codeset. No symbolic
names are provided
See virkeycode-atset1(7)
- ``atset2``
The numeric values are those defined by the AT keyboard controller,
set 2. No symbolic names are provided
See virkeycode-atset2(7)
- ``atset3``
The numeric values are those defined by the AT keyboard controller,
set 3 (aka PS/2 compatible set). No symbolic names are provided
See virkeycode-atset3(7)
- ``os_x``
The numeric values are those defined by the macOS keyboard input
subsystem. The symbolic names match the corresponding macOS key
constant macro names
See virkeycode-osx(7) and virkeyname-osx(7)
- ``xt_kbd``
The numeric values are those defined by the Linux KBD device.
These are a variant on the original XT codeset, but often with
different encoding for extended keycodes. No symbolic names are
provided.
See virkeycode-xtkbd(7)
- ``win32``
The numeric values are those defined by the Win32 keyboard input
subsystem. The symbolic names match the corresponding Win32 key
constant macro names
See virkeycode-win32(7) and virkeyname-win32(7)
- ``usb``
The numeric values are those defined by the USB HID specification
for keyboard input. No symbolic names are provided
See virkeycode-usb(7)
- ``qnum``
The numeric values are those defined by the QNUM extension for sending
raw keycodes. These are a variant on the XT codeset, but extended
keycodes have the low bit of the second byte set, instead of the high
bit of the first byte. No symbolic names are provided.
See virkeycode-qnum(7)
**Examples:**
::
# send three strokes 'k', 'e', 'y', using xt codeset. these
# are all pressed simultaneously and may be received by the guest
# in random order
virsh send-key dom --codeset xt 37 18 21
# send one stroke 'right-ctrl+C'
virsh send-key dom KEY_RIGHTCTRL KEY_C
# send a tab, held for 1 second
virsh send-key --holdtime 1000 0xf
send-process-signal
-------------------
**Syntax:**
::
send-process-signal domain-id pid signame
Send a signal *signame* to the process identified by *pid* running in
the virtual domain *domain-id*. The *pid* is a process ID in the virtual
domain namespace.
The *signame* argument may be either an integer signal constant number,
or one of the symbolic names:
::
"nop", "hup", "int", "quit", "ill",
"trap", "abrt", "bus", "fpe", "kill",
"usr1", "segv", "usr2", "pipe", "alrm",
"term", "stkflt", "chld", "cont", "stop",
"tstp", "ttin", "ttou", "urg", "xcpu",
"xfsz", "vtalrm", "prof", "winch", "poll",
"pwr", "sys", "rt0", "rt1", "rt2", "rt3",
"rt4", "rt5", "rt6", "rt7", "rt8", "rt9",
"rt10", "rt11", "rt12", "rt13", "rt14", "rt15",
"rt16", "rt17", "rt18", "rt19", "rt20", "rt21",
"rt22", "rt23", "rt24", "rt25", "rt26", "rt27",
"rt28", "rt29", "rt30", "rt31", "rt32"
The symbol name may optionally be prefixed with ``sig`` or ``sig_`` and
may be in uppercase or lowercase.
**Examples:**
::
virsh send-process-signal myguest 1 15
virsh send-process-signal myguest 1 term
virsh send-process-signal myguest 1 sigterm
virsh send-process-signal myguest 1 SIG_HUP
set-lifecycle-action
--------------------
**Syntax:**
::
set-lifecycle-action domain type action
[[--config] [--live] | [--current]]
Set the lifecycle *action* for specified lifecycle *type*.
The valid types are "poweroff", "reboot" and "crash", and for each of
them valid *action* is one of "destroy", "restart", "rename-restart",
"preserve". For *type* "crash", additional actions "coredump-destroy"
and "coredump-restart" are supported.
set-user-password
-----------------
**Syntax:**
::
set-user-password domain user password [--encrypted]
Set the password for the *user* account in the guest domain.
If *--encrypted* is specified, the password is assumed to be already
encrypted by the method required by the guest OS.
For QEMU/KVM, this requires the guest agent to be configured
and running.
setmaxmem
---------
**Syntax:**
::
setmaxmem domain size [[--config] [--live] | [--current]]
Change the maximum memory allocation limit for a guest domain.
If *--live* is specified, affect a running guest.
If *--config* is specified, affect the next start of a persistent guest.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest.
Both *--live* and *--config* flags may be given, but *--current* is
exclusive. If no flag is specified, behavior is different depending
on hypervisor.
Some hypervisors such as QEMU/KVM don't support live changes (especially
increasing) of the maximum memory limit. Even persistent configuration changes
might not be performed with some hypervisors/configuration (e.g. on NUMA enabled
domains on QEMU). For complex configuration changes use command ``edit``
instead).
*size* is a scaled integer (see ``NOTES`` above); it defaults to kibibytes
(blocks of 1024 bytes) unless you provide a suffix (and the older option
name *--kilobytes* is available as a deprecated synonym) . Libvirt rounds
up to the nearest kibibyte. Some hypervisors require a larger granularity
than KiB, and requests that are not an even multiple will be rounded up.
For example, vSphere/ESX rounds the parameter up to mebibytes (1024 kibibytes).
setmem
------
**Syntax:**
::
setmem domain size [[--config] [--live] | [--current]]
Change the memory allocation for a guest domain.
If *--live* is specified, perform a memory balloon of a running guest.
If *--config* is specified, affect the next start of a persistent guest.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest.
Both *--live* and *--config* flags may be given, but *--current* is
exclusive. If no flag is specified, behavior is different depending
on hypervisor.
*size* is a scaled integer (see ``NOTES`` above); it defaults to kibibytes
(blocks of 1024 bytes) unless you provide a suffix (and the older option
name *--kilobytes* is available as a deprecated synonym) . Libvirt rounds
up to the nearest kibibyte. Some hypervisors require a larger granularity
than KiB, and requests that are not an even multiple will be rounded up.
For example, vSphere/ESX rounds the parameter up to mebibytes (1024 kibibytes).
For Xen, you can only adjust the memory of a running domain if the domain is
paravirtualized or running the PV balloon driver.
For LXC, the value being set is the cgroups value for limit_in_bytes or the
maximum amount of user memory (including file cache). When viewing memory
inside the container, this is the /proc/meminfo "MemTotal" value. When viewing
the value from the host, use the ``virsh memtune`` command. In order to view
the current memory in use and the maximum value allowed to set memory, use
the ``virsh dominfo`` command.
setvcpus
--------
**Syntax:**
::
setvcpus domain count [--maximum] [[--config] [--live] | [--current]] [--guest] [--hotpluggable]
Change the number of virtual CPUs active in a guest domain. By default,
this command works on active guest domains. To change the settings for an
inactive guest domain, use the *--config* flag.
The *count* value may be limited by host, hypervisor, or a limit coming
from the original description of the guest domain. For Xen, you can only
adjust the virtual CPUs of a running domain if the domain is paravirtualized.
If the *--config* flag is specified, the change is made to the stored XML
configuration for the guest domain, and will only take effect when the guest
domain is next started.
If *--live* is specified, the guest domain must be active, and the change
takes place immediately. Both the *--config* and *--live* flags may be
specified together if supported by the hypervisor. If this command is run
before the guest has finished booting, the guest may fail to process
the change.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest.
When no flags are given, the *--live*
flag is assumed and the guest domain must be active. In this situation it
is up to the hypervisor whether the *--config* flag is also assumed, and
therefore whether the XML configuration is adjusted to make the change
persistent.
If *--guest* is specified, then the count of cpus is modified in the guest
instead of the hypervisor. This flag is usable only for live domains
and may require guest agent to be configured in the guest.
To allow adding vcpus to persistent definitions that can be later hotunplugged
after the domain is booted it is necessary to specify the *--hotpluggable*
flag. Vcpus added to live domains supporting vcpu unplug are automatically
marked as hotpluggable.
The *--maximum* flag controls the maximum number of virtual cpus that can
be hot-plugged the next time the domain is booted. As such, it must only be
used with the *--config* flag, and not with the *--live* or the *--current*
flag. Note that it may not be possible to change the maximum vcpu count if
the processor topology is specified for the guest.
setvcpu
-------
**Syntax:**
::
setvcpu domain vcpulist [--enable] | [--disable]
[[--live] [--config] | [--current]]
Change state of individual vCPUs using hot(un)plug mechanism.
See ``vcpupin`` for information on format of *vcpulist*. Hypervisor drivers may
require that *vcpulist* contains exactly vCPUs belonging to one hotpluggable
entity. This is usually just a single vCPU but certain architectures such as
ppc64 require a full core to be specified at once.
Note that hypervisors may refuse to disable certain vcpus such as vcpu 0 or
others.
If *--live* is specified, affect a running domain.
If *--config* is specified, affect the next startup of a persistent guest.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest. This is the
default. Both *--live* and *--config* flags may be given, but
*--current* is exclusive.
shutdown
--------
**Syntax:**
::
shutdown domain [--mode MODE-LIST]
Gracefully shuts down a domain. This coordinates with the domain OS
to perform graceful shutdown, so there is no guarantee that it will
succeed, and may take a variable length of time depending on what
services must be shutdown in the domain.
The exact behavior of a domain when it shuts down is set by the
*on_poweroff* parameter in the domain's XML definition.
If *domain* is transient, then the metadata of any snapshots and
checkpoints will be lost once the guest stops running, but the underlying
contents still exist, and a new domain with the same name and UUID can
restore the snapshot metadata with ``snapshot-create``, and the checkpoint
metadata with ``checkpoint-create``.
By default the hypervisor will try to pick a suitable shutdown
method. To specify an alternative method, the *--mode* parameter
can specify a comma separated list which includes ``acpi``, ``agent``,
``initctl``, ``signal`` and ``paravirt``. The order in which drivers will
try each mode is undefined, and not related to the order specified to virsh.
For strict control over ordering, use a single mode at a time and
repeat the command.
start
-----
**Syntax:**
::
start domain-name-or-uuid [--console] [--paused]
[--autodestroy] [--bypass-cache] [--force-boot]
[--pass-fds N,M,...]
Start a (previously defined) inactive domain, either from the last
``managedsave`` state, or via a fresh boot if no managedsave state is
present. The domain will be paused if the *--paused* option is
used and supported by the driver; otherwise it will be running.
If *--console* is requested, attach to the console after creation.
If *--autodestroy* is requested, then the guest will be automatically
destroyed when virsh closes its connection to libvirt, or otherwise
exits. If *--bypass-cache* is specified, and managedsave state exists,
the restore will avoid the file system cache, although this may slow
down the operation. If *--force-boot* is specified, then any
managedsave state is discarded and a fresh boot occurs.
If *--pass-fds* is specified, the argument is a comma separated list
of open file descriptors which should be pass on into the guest. The
file descriptors will be re-numbered in the guest, starting from 3. This
is only supported with container based virtualization.
suspend
-------
**Syntax:**
::
suspend domain
Suspend a running domain. It is kept in memory but won't be scheduled
anymore.
ttyconsole
----------
**Syntax:**
::
ttyconsole domain
Output the device used for the TTY console of the domain. If the information
is not available the processes will provide an exit code of 1.
undefine
--------
**Syntax:**
::
undefine domain [--managed-save] [--snapshots-metadata]
[--checkpoints-metadata] [--nvram] [--keep-nvram]
[ {--storage volumes | --remove-all-storage
[--delete-storage-volume-snapshots]} --wipe-storage]
Undefine a domain. If the domain is running, this converts it to a
transient domain, without stopping it. If the domain is inactive,
the domain configuration is removed.
The *--managed-save* flag guarantees that any managed save image (see
the ``managedsave`` command) is also cleaned up. Without the flag, attempts
to undefine a domain with a managed save image will fail.
The *--snapshots-metadata* flag guarantees that any snapshots (see the
``snapshot-list`` command) are also cleaned up when undefining an inactive
domain. Without the flag, attempts to undefine an inactive domain with
snapshot metadata will fail. If the domain is active, this flag is
ignored.
The *--checkpoints-metadata* flag guarantees that any checkpoints (see the
``checkpoint-list`` command) are also cleaned up when undefining an inactive
domain. Without the flag, attempts to undefine an inactive domain with
checkpoint metadata will fail. If the domain is active, this flag is
ignored.
*--nvram* and *--keep-nvram* specify accordingly to delete or keep nvram
(/domain/os/nvram/) file. If the domain has an nvram file and the flags are
omitted, the undefine will fail.
The *--storage* flag takes a parameter ``volumes``, which is a comma separated
list of volume target names or source paths of storage volumes to be removed
along with the undefined domain. Volumes can be undefined and thus removed only
on inactive domains. Volume deletion is only attempted after the domain is
undefined; if not all of the requested volumes could be deleted, the
error message indicates what still remains behind. If a volume path is not
found in the domain definition, it's treated as if the volume was successfully
deleted. Only volumes managed by libvirt in storage pools can be removed this
way.
(See ``domblklist`` for list of target names associated to a domain).
Example: --storage vda,/path/to/storage.img
The *--remove-all-storage* flag specifies that all of the domain's storage
volumes should be deleted.
The *--delete-storage-volume-snapshots* (previously *--delete-snapshots*)
flag specifies that any snapshots associated with
the storage volume should be deleted as well. Requires the
*--remove-all-storage* flag to be provided. Not all storage drivers
support this option, presently only rbd. Using this when also removing volumes
handled by a storage driver which does not support the flag will result in
failure.
The flag *--wipe-storage* specifies that the storage volumes should be
wiped before removal.
NOTE: For an inactive domain, the domain name or UUID must be used as the
*domain*.
vcpucount
---------
**Syntax:**
::
vcpucount domain [{--maximum | --active}
{--config | --live | --current}] [--guest]
Print information about the virtual cpu counts of the given
*domain*. If no flags are specified, all possible counts are
listed in a table; otherwise, the output is limited to just the
numeric value requested. For historical reasons, the table
lists the label "current" on the rows that can be queried in isolation
via the *--active* flag, rather than relating to the *--current* flag.
*--maximum* requests information on the maximum cap of vcpus that a
domain can add via ``setvcpus``, while *--active* shows the current
usage; these two flags cannot both be specified. *--config*
requires a persistent guest and requests information regarding the next
time the domain will be booted, *--live* requires a running domain and
lists current values, and *--current* queries according to the current
state of the domain (corresponding to *--live* if running, or
*--config* if inactive); these three flags are mutually exclusive.
If *--guest* is specified, then the count of cpus is reported from
the perspective of the guest. This flag is usable only for live domains
and may require guest agent to be configured in the guest.
vcpuinfo
--------
**Syntax:**
::
vcpuinfo domain [--pretty]
Returns basic information about the domain virtual CPUs, like the number of
vCPUs, the running time, the affinity to physical processors.
With *--pretty*, cpu affinities are shown as ranges.
**Example:**
::
$ virsh vcpuinfo fedora
VCPU: 0
CPU: 0
State: running
CPU time: 7,0s
CPU Affinity: yyyy
VCPU: 1
CPU: 1
State: running
CPU time: 0,7s
CPU Affinity: yyyy
``STATES``
The State field displays the current operating state of a virtual CPU
- ``offline``
The virtual CPU is offline and not usable by the domain.
This state is not supported by all hypervisors.
- ``running``
The virtual CPU is available to the domain and is operating.
- ``blocked``
The virtual CPU is available to the domain but is waiting for a resource.
This state is not supported by all hypervisors, in which case *running*
may be reported instead.
- ``no state``
The virtual CPU state could not be determined. This could happen if
the hypervisor is newer than virsh.
- ``N/A``
There's no information about the virtual CPU state available. This can
be the case if the domain is not running or the hypervisor does
not report the virtual CPU state.
vcpupin
-------
**Syntax:**
::
vcpupin domain [vcpu] [cpulist] [[--live] [--config] | [--current]]
Query or change the pinning of domain VCPUs to host physical CPUs. To
pin a single *vcpu*, specify *cpulist*; otherwise, you can query one
*vcpu* or omit *vcpu* to list all at once.
*cpulist* is a list of physical CPU numbers. Its syntax is a comma
separated list and a special markup using '-' and '^' (ex. '0-4', '0-3,^2') can
also be allowed. The '-' denotes the range and the '^' denotes exclusive.
For pinning the *vcpu* to all physical cpus specify 'r' as a *cpulist*.
If *--live* is specified, affect a running guest.
If *--config* is specified, affect the next start of a persistent guest.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest.
Both *--live* and *--config* flags may be given if *cpulist* is present,
but *--current* is exclusive.
If no flag is specified, behavior is different depending on hypervisor.
``Note``: The expression is sequentially evaluated, so "0-15,^8" is
identical to "9-14,0-7,15" but not identical to "^8,0-15".
vncdisplay
----------
**Syntax:**
::
vncdisplay domain
Output the IP address and port number for the VNC display. If the information
is not available the processes will provide an exit code of 1.
DEVICE COMMANDS
===============
The following commands manipulate devices associated to domains.
The *domain* can be specified as a short integer, a name or a full UUID.
To better understand the values allowed as options for the command
reading the documentation at `https://libvirt.org/formatdomain.html <https://libvirt.org/formatdomain.html>`_ on the
format of the device sections to get the most accurate set of accepted values.
attach-device
-------------
**Syntax:**
::
attach-device domain FILE [[[--live] [--config] | [--current]] | [--persistent]]
Attach a device to the domain, using a device definition in an XML
file using a device definition element such as <disk> or <interface>
as the top-level element. See the documentation at
`https://libvirt.org/formatdomain.html#elementsDevices <https://libvirt.org/formatdomain.html#elementsDevices>`__ to learn about
libvirt XML format for a device. If *--config* is specified the
command alters the persistent guest configuration with the device
attach taking effect the next time libvirt starts the domain.
For cdrom and floppy devices, this command only replaces the media
within an existing device; consider using ``update-device`` for this
usage. For passthrough host devices, see also ``nodedev-detach``,
needed if the PCI device does not use managed mode.
If *--live* is specified, affect a running domain.
If *--config* is specified, affect the next startup of a persistent guest.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest.
Both *--live* and *--config* flags may be given, but *--current* is
exclusive. When no flag is specified legacy API is used whose behavior depends
on the hypervisor driver.
For compatibility purposes, *--persistent* behaves like *--config* for
an offline domain, and like *--live* *--config* for a running domain.
``Note``: using of partial device definition XML files may lead to unexpected
results as some fields may be autogenerated and thus match devices other than
expected.
attach-disk
-----------
**Syntax:**
::
attach-disk domain source target [[[--live] [--config] |
[--current]] | [--persistent]] [--targetbus bus]
[--driver driver] [--subdriver subdriver] [--iothread iothread]
[--cache cache] [--io io] [--type type] [--alias alias]
[--mode mode] [--sourcetype sourcetype] [--serial serial]
[--wwn wwn] [--rawio] [--address address] [--multifunction]
[--print-xml]
Attach a new disk device to the domain.
*source* is path for the files and devices. *target* controls the bus or
device under which the disk is exposed to the guest OS. It indicates the
"logical" device name; the optional *targetbus* attribute specifies the type
of disk device to emulate; possible values are driver specific, with typical
values being *ide*, *scsi*, *virtio*, *xen*, *usb*, *sata*, or *sd*, if
omitted, the bus type is inferred from the style of the device name (e.g. a
device named 'sda' will typically be exported using a SCSI bus). *driver* can
be *file*, *tap* or *phy* for the Xen
hypervisor depending on the kind of access; or *qemu* for the QEMU emulator.
Further details to the driver can be passed using *subdriver*. For Xen
*subdriver* can be *aio*, while for QEMU subdriver should match the format
of the disk source, such as *raw* or *qcow2*. Hypervisor default will be
used if *subdriver* is not specified. However, the default may not be
correct, esp. for QEMU as for security reasons it is configured not to detect
disk formats. *type* can indicate *lun*, *cdrom* or *floppy* as
alternative to the disk default, although this use only replaces the media
within the existing virtual cdrom or floppy device; consider using
``update-device`` for this usage instead.
*alias* can set user supplied alias.
*mode* can specify the two specific mode *readonly* or *shareable*.
*sourcetype* can indicate the type of source (block|file)
*cache* can be one of "default", "none", "writethrough", "writeback",
"directsync" or "unsafe".
*io* controls specific policies on I/O; QEMU guests support "threads",
"native" and "io_uring".
*iothread* is the number within the range of domain IOThreads to which
this disk may be attached (QEMU only).
*serial* is the serial of disk device. *wwn* is the wwn of disk device.
*rawio* indicates the disk needs rawio capability.
*address* is the address of disk device in the form of
pci:domain.bus.slot.function, scsi:controller.bus.unit,
ide:controller.bus.unit, usb:bus.port, sata:controller.bus.unit or
ccw:cssid.ssid.devno. Virtio-ccw devices must have their cssid set to 0xfe.
*multifunction* indicates specified pci address is a multifunction pci device
address.
If *--print-xml* is specified, then the XML of the disk that would be attached
is printed instead.
If *--live* is specified, affect a running domain.
If *--config* is specified, affect the next startup of a persistent guest.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest.
Both *--live* and *--config* flags may be given, but *--current* is
exclusive. When no flag is specified legacy API is used whose behavior depends
on the hypervisor driver.
For compatibility purposes, *--persistent* behaves like *--config* for
an offline domain, and like *--live* *--config* for a running domain.
Likewise, *--shareable* is an alias for *--mode shareable*.
attach-interface
----------------
**Syntax:**
::
attach-interface domain type source [[[--live]
[--config] | [--current]] | [--persistent]]
[--target target] [--mac mac] [--script script] [--model model]
[--inbound average,peak,burst,floor] [--outbound average,peak,burst]
[--alias alias] [--managed] [--print-xml]
Attach a new network interface to the domain.
``type`` can be one of the:
*network* to indicate connection via a libvirt virtual network,
*bridge* to indicate connection via a bridge device on the host,
*direct* to indicate connection directly to one of the host's network
interfaces or bridges,
*hostdev* to indicate connection using a passthrough of PCI device
on the host.
``source`` indicates the source of the connection. The source depends
on the type of the interface:
*network* name of the virtual network,
*bridge* the name of the bridge device,
*direct* the name of the host's interface or bridge,
*hostdev* the PCI address of the host's interface formatted
as domain:bus:slot.function.
``--target`` is used to specify the tap/macvtap device to be used to
connect the domain to the source. Names starting with 'vnet' are
considered as auto-generated and are blanked out/regenerated each
time the interface is attached.
``--mac`` specifies the MAC address of the network interface; if a MAC
address is not given, a new address will be automatically generated
(and stored in the persistent configuration if "--config" is given on
the command line).
``--script`` is used to specify a path to a custom script to be called
while attaching to a bridge - this will be called instead of the default
script not in addition to it. This is valid only for interfaces of
*bridge* type and only for Xen domains.
``--model`` specifies the network device model to be presented to the
domain.
``alias`` can set user supplied alias.
``--inbound`` and ``--outbound`` control the bandwidth of the
interface. At least one from the *average*, *floor* pair must be
specified. The other two *peak* and *burst* are optional, so
"average,peak", "average,,burst", "average,,,floor", "average" and
",,,floor" are also legal. Values for *average*, *floor* and *peak*
are expressed in kilobytes per second, while *burst* is expressed in
kilobytes in a single burst at *peak* speed as described in the
Network XML documentation at
`https://libvirt.org/formatnetwork.html#elementQoS <https://libvirt.org/formatnetwork.html#elementQoS>`__.
``--managed`` is usable only for *hostdev* type and tells libvirt
that the interface should be managed, which means detached and reattached
from/to the host by libvirt.
If ``--print-xml`` is specified, then the XML of the interface that would be
attached is printed instead.
If ``--live`` is specified, affect a running domain.
If ``--config`` is specified, affect the next startup of a persistent guest.
If ``--current`` is specified, affect the current domain state, which
can either be live or offline.
Both ``--live`` and ``--config`` flags may be given, but ``--current`` is
exclusive. When no flag is specified legacy API is used whose behavior
depends on the hypervisor driver.
For compatibility purposes, ``--persistent`` behaves like ``--config`` for
an offline domain, and like ``--live`` ``--config`` for a running domain.
``Note``: the optional target value is the name of a device to be created
as the back-end on the node. If not provided a device named "vnetN" or "vifN"
will be created automatically.
detach-device
-------------
**Syntax:**
::
detach-device domain FILE [[[--live] [--config] |
[--current]] | [--persistent]]
Detach a device from the domain, takes the same kind of XML descriptions
as command ``attach-device``.
For passthrough host devices, see also ``nodedev-reattach``, needed if
the device does not use managed mode.
``Note``: The supplied XML description of the device should be as specific
as its definition in the domain XML. The set of attributes used
to match the device are internal to the drivers. Using a partial definition,
or attempting to detach a device that is not present in the domain XML,
but shares some specific attributes with one that is present,
may lead to unexpected results.
``Quirk``: Device unplug is asynchronous in most cases and requires guest
cooperation. This means that it's up to the discretion of the guest to disallow
or delay the unplug arbitrarily. As the libvirt API used in this command was
designed as synchronous it returns success after some timeout even if the device
was not unplugged yet to allow further interactions with the domain e.g. if the
guest is unresponsive. Callers which need to make sure that the
device was unplugged can use libvirt events (see virsh event) to be notified
when the device is removed. Note that the event may arrive before the command
returns.
If *--live* is specified, affect a running domain.
If *--config* is specified, affect the next startup of a persistent guest.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest.
Both *--live* and *--config* flags may be given, but *--current* is
exclusive. When no flag is specified legacy API is used whose behavior depends
on the hypervisor driver.
For compatibility purposes, *--persistent* behaves like *--config* for
an offline domain, and like *--live* *--config* for a running domain.
Note that older versions of virsh used *--config* as an alias for
*--persistent*.
detach-device-alias
-------------------
**Syntax:**
::
detach-device-alias domain alias [[[--live] [--config] | [--current]]]]
Detach a device with given *alias* from the *domain*. This command returns
successfully after the unplug request was sent to the hypervisor. The actual
removal of the device is notified asynchronously via libvirt events
(see virsh event).
If *--live* is specified, affect a running domain.
If *--config* is specified, affect the next startup of a persistent guest.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest.
Both *--live* and *--config* flags may be given, but *--current* is
exclusive.
detach-disk
-----------
**Syntax:**
::
detach-disk domain target [[[--live] [--config] |
[--current]] | [--persistent]] [--print-xml]
Detach a disk device from a domain. The *target* is the device as seen
from the domain.
If *--live* is specified, affect a running domain.
If *--config* is specified, affect the next startup of a persistent guest.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest.
Both *--live* and *--config* flags may be given, but *--current* is
exclusive. When no flag is specified legacy API is used whose behavior depends
on the hypervisor driver.
For compatibility purposes, *--persistent* behaves like *--config* for
an offline domain, and like *--live* *--config* for a running domain.
Note that older versions of virsh used *--config* as an alias for
*--persistent*.
If ``--print-xml`` is specified, then the XML which would be used to detach the
disk is printed instead.
Please see documentation for ``detach-device`` for known quirks.
detach-interface
----------------
**Syntax:**
::
detach-interface domain type [--mac mac]
[[[--live] [--config] | [--current]] | [--persistent]]
Detach a network interface from a domain.
*type* can be either *network* to indicate a physical network device or
*bridge* to indicate a bridge to a device. It is recommended to use the
*mac* option to distinguish between the interfaces if more than one are
present on the domain.
If *--live* is specified, affect a running domain.
If *--config* is specified, affect the next startup of a persistent guest.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest.
Both *--live* and *--config* flags may be given, but *--current* is
exclusive. When no flag is specified legacy API is used whose behavior depends
on the hypervisor driver.
For compatibility purposes, *--persistent* behaves like *--config* for
an offline domain, and like *--live* *--config* for a running domain.
Note that older versions of virsh used *--config* as an alias for
*--persistent*.
Please see documentation for ``detach-device`` for known quirks.
update-device
-------------
**Syntax:**
::
update-device domain file [--force] [[[--live]
[--config] | [--current]] | [--persistent]]
Update the characteristics of a device associated with *domain*,
based on the device definition in an XML *file*. The *--force* option
can be used to force device update, e.g., to eject a CD-ROM even if it is
locked/mounted in the domain. See the documentation at
`https://libvirt.org/formatdomain.html#elementsDevices <https://libvirt.org/formatdomain.html#elementsDevices>`__ to learn about
libvirt XML format for a device.
If *--live* is specified, affect a running domain.
If *--config* is specified, affect the next startup of a persistent guest.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest.
Both *--live* and *--config* flags may be given, but *--current* is
exclusive. Not specifying any flag is the same as specifying *--current*.
For compatibility purposes, *--persistent* behaves like *--config* for
an offline domain, and like *--live* *--config* for a running domain.
Note that older versions of virsh used *--config* as an alias for
*--persistent*.
``Note``: using of partial device definition XML files may lead to unexpected
results as some fields may be autogenerated and thus match devices other than
expected.
change-media
------------
**Syntax:**
::
change-media domain path [--eject] [--insert]
[--update] [source] [--force] [[--live] [--config] |
[--current]] [--print-xml] [--block]
Change media of CDROM or floppy drive. *path* can be the fully-qualified path
or the unique target name (<target dev='hdc'>) of the disk device. *source*
specifies the path of the media to be inserted or updated. The *--block* flag
allows setting the backing type in case a block device is used as media for the
CDROM or floppy drive instead of a file.
*--eject* indicates the media will be ejected.
*--insert* indicates the media will be inserted. *source* must be specified.
If the device has source (e.g. <source file='media'>), and *source* is not
specified, *--update* is equal to *--eject*. If the device has no source,
and *source* is specified, *--update* is equal to *--insert*. If the device
has source, and *source* is specified, *--update* behaves like combination
of *--eject* and *--insert*.
If none of *--eject*, *--insert*, and *--update* is specified, *--update*
is used by default.
The *--force* option can be used to force media changing.
If *--live* is specified, alter live configuration of running guest.
If *--config* is specified, alter persistent configuration, effect observed
on next startup of the guest.
*--current* can be either or both of *live* and *config*, depends on
the hypervisor's implementation.
Both *--live* and *--config* flags may be given, but *--current* is
exclusive. If no flag is specified, behavior is different depending
on hypervisor.
If *--print-xml* is specified, the XML that would be used to change media is
printed instead of changing the media.
NODEDEV COMMANDS
================
The following commands manipulate host devices that are intended to be
passed through to guest domains via <hostdev> elements in a domain's
<devices> section. A node device key is generally specified by the bus
name followed by its address, using underscores between all components,
such as pci_0000_00_02_1, usb_1_5_3, or net_eth1_00_27_13_6a_fe_00.
The ``nodedev-list`` gives the full list of host devices that are known
to libvirt, although this includes devices that cannot be assigned to
a guest (for example, attempting to detach the PCI device that controls
the host's hard disk controller where the guest's disk images live could
cause the host system to lock up or reboot).
For more information on node device definition see:
`https://libvirt.org/formatnode.html <https://libvirt.org/formatnode.html>`_.
Passthrough devices cannot be simultaneously used by the host and its
guest domains, nor by multiple active guests at once. If the
<hostdev> description of a PCI device includes the attribute ``managed='yes'``,
and the hypervisor driver supports it, then the device is in managed mode, and
attempts to use that passthrough device in an active guest will
automatically behave as if ``nodedev-detach`` (guest start, device
hot-plug) and ``nodedev-reattach`` (guest stop, device hot-unplug) were
called at the right points. If a PCI device is not marked as managed,
then it must manually be detached before guests can use it, and manually
reattached to be returned to the host. Also, if a device is manually detached,
then the host does not regain control of the device without a matching
reattach, even if the guests use the device in managed mode.
nodedev-create
--------------
**Syntax:**
::
nodedev-create FILE
Create a device on the host node that can then be assigned to virtual
machines. Normally, libvirt is able to automatically determine which
host nodes are available for use, but this allows registration of
host hardware that libvirt did not automatically detect. *file*
contains xml for a top-level <device> description of a node device.
nodedev-destroy
---------------
**Syntax:**
::
nodedev-destroy device
Destroy (stop) a device on the host. *device* can be either device
name or wwn pair in "wwnn,wwpn" format (only works for vHBA currently).
Note that this makes libvirt quit managing a host device, and may even
make that device unusable by the rest of the physical host until a reboot.
nodedev-detach
--------------
**Syntax:**
::
nodedev-detach nodedev [--driver backend_driver]
Detach *nodedev* from the host, so that it can safely be used by
guests via <hostdev> passthrough. This is reversed with
``nodedev-reattach``, and is done automatically for managed devices.
Different backend drivers expect the device to be bound to different
dummy devices. For example, QEMU's "kvm" backend driver (the default)
expects the device to be bound to pci-stub, but its "vfio" backend
driver expects the device to be bound to vfio-pci. The *--driver*
parameter can be used to specify the desired backend driver.
nodedev-dumpxml
---------------
**Syntax:**
::
nodedev-dumpxml device
Dump a <device> XML representation for the given node device, including
such information as the device name, which bus owns the device, the
vendor and product id, and any capabilities of the device usable by
libvirt (such as whether device reset is supported). *device* can
be either device name or wwn pair in "wwnn,wwpn" format (only works
for HBA).
nodedev-list
------------
**Syntax:**
::
nodedev-list cap --tree
List all of the devices available on the node that are known by libvirt.
*cap* is used to filter the list by capability types, the types must be
separated by comma, e.g. --cap pci,scsi. Valid capability types include
'system', 'pci', 'usb_device', 'usb', 'net', 'scsi_host', 'scsi_target',
'scsi', 'storage', 'fc_host', 'vports', 'scsi_generic', 'drm', 'mdev',
'mdev_types', 'ccw', 'css'.
If *--tree* is used, the output is formatted in a tree representing parents of each
node. *cap* and *--tree* are mutually exclusive.
nodedev-reattach
----------------
**Syntax:**
::
nodedev-reattach nodedev
Declare that *nodedev* is no longer in use by any guests, and that
the host can resume normal use of the device. This is done
automatically for PCI devices in managed mode and USB devices, but
must be done explicitly to match any explicit ``nodedev-detach``.
nodedev-reset
-------------
**Syntax:**
::
nodedev-reset nodedev
Trigger a device reset for *nodedev*, useful prior to transferring
a node device between guest passthrough or the host. Libvirt will
often do this action implicitly when required, but this command
allows an explicit reset when needed.
nodedev-event
-------------
**Syntax:**
::
nodedev-event {[nodedev] event [--loop] [--timeout seconds] [--timestamp] | --list}
Wait for a class of node device events to occur, and print appropriate
details of events as they happen. The events can optionally be filtered
by *nodedev*. Using *--list* as the only argument will provide a list
of possible *event* values known by this client, although the connection
might not allow registering for all these events.
By default, this command is one-shot, and returns success once an event
occurs; you can send SIGINT (usually via ``Ctrl-C``) to quit immediately.
If *--timeout* is specified, the command gives up waiting for events
after *seconds* have elapsed. With *--loop*, the command prints all
events until a timeout or interrupt key.
When *--timestamp* is used, a human-readable timestamp will be printed
before the event.
VIRTUAL NETWORK COMMANDS
========================
The following commands manipulate networks. Libvirt has the capability to
define virtual networks which can then be used by domains and linked to
actual network devices. For more detailed information about this feature
see the documentation at `https://libvirt.org/formatnetwork.html <https://libvirt.org/formatnetwork.html>`__ . Many
of the commands for virtual networks are similar to the ones used for domains,
but the way to name a virtual network is either by its name or UUID.
net-autostart
-------------
**Syntax:**
::
net-autostart network [--disable]
Configure a virtual network to be automatically started at boot.
The *--disable* option disable autostarting.
net-create
----------
**Syntax:**
::
net-create file
Create a transient (temporary) virtual network from an
XML *file* and instantiate (start) the network.
See the documentation at `https://libvirt.org/formatnetwork.html <https://libvirt.org/formatnetwork.html>`__
to get a description of the XML network format used by libvirt.
net-define
----------
**Syntax:**
::
net-define file
Define an inactive persistent virtual network or modify an existing persistent
one from the XML *file*.
net-destroy
-----------
**Syntax:**
::
net-destroy network
Destroy (stop) a given transient or persistent virtual network
specified by its name or UUID. This takes effect immediately.
net-dumpxml
-----------
**Syntax:**
::
net-dumpxml network [--inactive]
Output the virtual network information as an XML dump to stdout.
If *--inactive* is specified, then physical functions are not
expanded into their associated virtual functions.
net-edit
--------
**Syntax:**
::
net-edit network
Edit the XML configuration file for a network.
This is equivalent to:
::
virsh net-dumpxml --inactive network > network.xml
vi network.xml (or make changes with your other text editor)
virsh net-define network.xml
except that it does some error checking.
The editor used can be supplied by the ``$VISUAL`` or ``$EDITOR`` environment
variables, and defaults to ``vi``.
net-event
---------
**Syntax:**
::
net-event {[network] event [--loop] [--timeout seconds] [--timestamp] | --list}
Wait for a class of network events to occur, and print appropriate details
of events as they happen. The events can optionally be filtered by
*network*. Using *--list* as the only argument will provide a list
of possible *event* values known by this client, although the connection
might not allow registering for all these events.
By default, this command is one-shot, and returns success once an event
occurs; you can send SIGINT (usually via ``Ctrl-C``) to quit immediately.
If *--timeout* is specified, the command gives up waiting for events
after *seconds* have elapsed. With *--loop*, the command prints all
events until a timeout or interrupt key.
When *--timestamp* is used, a human-readable timestamp will be printed
before the event.
net-info
--------
**Syntax:**
::
net-info network
Returns basic information about the *network* object.
net-list
--------
**Syntax:**
::
net-list [--inactive | --all]
{ [--table] | --name | --uuid }
[--persistent] [<--transient>]
[--autostart] [<--no-autostart>]
Returns the list of active networks, if *--all* is specified this will also
include defined but inactive networks, if *--inactive* is specified only the
inactive ones will be listed. You may also want to filter the returned networks
by *--persistent* to list the persistent ones, *--transient* to list the
transient ones, *--autostart* to list the ones with autostart enabled, and
*--no-autostart* to list the ones with autostart disabled.
If *--name* is specified, network names are printed instead of the table
formatted one per line. If *--uuid* is specified network's UUID's are printed
instead of names. Flag *--table* specifies that the legacy table-formatted
output should be used. This is the default. All of these are mutually
exclusive.
NOTE: When talking to older servers, this command is forced to use a series of
API calls with an inherent race, where a pool might not be listed or might appear
more than once if it changed state between calls while the list was being
collected. Newer servers do not have this problem.
net-name
--------
**Syntax:**
::
net-name network-UUID
Convert a network UUID to network name.
net-start
---------
**Syntax:**
::
net-start network
Start a (previously defined) inactive network.
net-undefine
------------
**Syntax:**
::
net-undefine network
Undefine the configuration for a persistent network. If the network is active,
make it transient.
net-uuid
--------
**Syntax:**
::
net-uuid network-name
Convert a network name to network UUID.
net-update
----------
**Syntax:**
::
net-update network command section xml
[--parent-index index] [[--live] [--config] | [--current]]
Update the given section of an existing network definition, with the
changes optionally taking effect immediately, without needing to
destroy and re-start the network.
*command* is one of "add-first", "add-last", "add" (a synonym for
add-last), "delete", or "modify".
*section* is one of "bridge", "domain", "ip", "ip-dhcp-host",
"ip-dhcp-range", "forward", "forward-interface", "forward-pf",
"portgroup", "dns-host", "dns-txt", or "dns-srv", each section being
named by a concatenation of the xml element hierarchy leading to the
element being changed. For example, "ip-dhcp-host" will change a
<host> element that is contained inside a <dhcp> element inside an
<ip> element of the network.
*xml* is either the text of a complete xml element of the type being
changed (e.g. "<host mac="00:11:22:33:44:55' ip='1.2.3.4'/>", or the
name of a file that contains a complete xml element. Disambiguation is
done by looking at the first character of the provided text - if the
first character is "<", it is xml text, if the first character is not
"<", it is the name of a file that contains the xml text to be used.
The *--parent-index* option is used to specify which of several
parent elements the requested element is in (0-based). For example, a
dhcp <host> element could be in any one of multiple <ip> elements in
the network; if a parent-index isn't provided, the "most appropriate"
<ip> element will be selected (usually the only one that already has a
<dhcp> element), but if *--parent-index* is given, that particular
instance of <ip> will get the modification.
If *--live* is specified, affect a running network.
If *--config* is specified, affect the next startup of a persistent network.
If *--current* is specified, it is equivalent to either *--live* or
*--config*, depending on the current state of the guest.
Both *--live* and *--config* flags may be given, but *--current* is
exclusive. Not specifying any flag is the same as specifying *--current*.
net-dhcp-leases
---------------
**Syntax:**
::
net-dhcp-leases network [mac]
Get a list of dhcp leases for all network interfaces connected to the given
virtual *network* or limited output just for one interface if *mac* is
specified.
NETWORK PORT COMMANDS
=====================
The following commands manipulate network ports. Libvirt virtual networks
have ports created when a virtual machine has a virtual network interface
added. In general there should be no need to use any of the commands
here, since the hypervisor drivers run these commands are the right
point in a virtual machine's lifecycle. They can be useful for debugging
problems and / or recovering from bugs / stale state.
net-port-list
-------------
**Syntax:**
::
net-port-list { [--table] | --uuid } network
List all network ports recorded against the network.
If *--uuid* is specified network ports' UUID's are printed
instead of a table. Flag *--table* specifies that the legacy
table-formatted output should be used. This is the default.
All of these are mutually exclusive.
net-port-create
---------------
**Syntax:**
::
net-port-create network file
Allocate a new network port reserving resources based on the
port description.
net-port-dumpxml
----------------
**Syntax:**
::
net-port-dumpxml network port
Output the network port information as an XML dump to stdout.
net-port-delete
---------------
**Syntax:**
::
net-port-delete network port
Delete record of the network port and release its resources
INTERFACE COMMANDS
==================
The following commands manipulate host interfaces. Often, these host
interfaces can then be used by name within domain <interface> elements
(such as a system-created bridge interface), but there is no
requirement that host interfaces be tied to any particular guest
configuration XML at all.
Many of the commands for host interfaces are similar to the ones used
for domains, and the way to name an interface is either by its name or
its MAC address. However, using a MAC address for an *iface*
argument only works when that address is unique (if an interface and a
bridge share the same MAC address, which is often the case, then using
that MAC address results in an error due to ambiguity, and you must
resort to a name instead).
iface-bridge
------------
**Syntax:**
::
iface-bridge interface bridge [--no-stp] [delay] [--no-start]
Create a bridge device named *bridge*, and attach the existing
network device *interface* to the new bridge. The new bridge
defaults to starting immediately, with STP enabled and a delay of 0;
these settings can be altered with *--no-stp*, *--no-start*, and an
integer number of seconds for *delay*. All IP address configuration
of *interface* will be moved to the new bridge device.
See also ``iface-unbridge`` for undoing this operation.
iface-define
------------
**Syntax:**
::
iface-define file
Define an inactive persistent physical host interface or modify an existing
persistent one from the XML *file*.
iface-destroy
-------------
**Syntax:**
::
iface-destroy interface
Destroy (stop) a given host interface, such as by running "if-down" to
disable that interface from active use. This takes effect immediately.
iface-dumpxml
-------------
**Syntax:**
::
iface-dumpxml interface [--inactive]
Output the host interface information as an XML dump to stdout. If
*--inactive* is specified, then the output reflects the persistent
state of the interface that will be used the next time it is started.
iface-edit
----------
**Syntax:**
::
iface-edit interface
Edit the XML configuration file for a host interface.
This is equivalent to:
::
virsh iface-dumpxml iface > iface.xml
vi iface.xml (or make changes with your other text editor)
virsh iface-define iface.xml
except that it does some error checking.
The editor used can be supplied by the ``$VISUAL`` or ``$EDITOR`` environment
variables, and defaults to ``vi``.
iface-list
----------
**Syntax:**
::
iface-list [--inactive | --all]
Returns the list of active host interfaces. If *--all* is specified
this will also include defined but inactive interfaces. If
*--inactive* is specified only the inactive ones will be listed.
iface-name
----------
**Syntax:**
::
iface-name interface
Convert a host interface MAC to interface name, if the MAC address is unique
among the host's interfaces.
*interface* specifies the interface MAC address.
iface-mac
---------
**Syntax:**
::
iface-mac interface
Convert a host interface name to MAC address.
*interface* specifies the interface name.
iface-start
-----------
**Syntax:**
::
iface-start interface
Start a (previously defined) host interface, such as by running "if-up".
iface-unbridge
--------------
**Syntax:**
::
iface-unbridge bridge [--no-start]
Tear down a bridge device named *bridge*, releasing its underlying
interface back to normal usage, and moving all IP address
configuration from the bridge device to the underlying device. The
underlying interface is restarted unless *--no-start* is present;
this flag is present for symmetry, but generally not recommended.
See also ``iface-bridge`` for creating a bridge.
iface-undefine
--------------
**Syntax:**
::
iface-undefine interface
Undefine the configuration for an inactive host interface.
iface-begin
-----------
**Syntax:**
::
iface-begin
Create a snapshot of current host interface settings, which can later
be committed (*iface-commit*) or restored (*iface-rollback*). If a
snapshot already exists, then this command will fail until the
previous snapshot has been committed or restored. Undefined behavior
results if any external changes are made to host interfaces outside of
the libvirt API between the beginning of a snapshot and its eventual
commit or rollback.
iface-commit
------------
**Syntax:**
::
iface-commit
Declare all changes since the last *iface-begin* as working, and
delete the rollback point. If no interface snapshot has already been
started, then this command will fail.
iface-rollback
--------------
**Syntax:**
::
iface-rollback
Revert all host interface settings back to the state recorded in the
last *iface-begin*. If no interface snapshot has already been
started, then this command will fail. Rebooting the host also serves
as an implicit rollback point.
STORAGE POOL COMMANDS
=====================
The following commands manipulate storage pools. Libvirt has the
capability to manage various storage solutions, including files, raw
partitions, and domain-specific formats, used to provide the storage
volumes visible as devices within virtual machines. For more detailed
information about this feature, see the documentation at
`https://libvirt.org/formatstorage.html <https://libvirt.org/formatstorage.html>`_ . Many of the commands for
pools are similar to the ones used for domains.
find-storage-pool-sources
-------------------------
**Syntax:**
::
find-storage-pool-sources type [srcSpec]
Returns XML describing all possible available storage pool sources that
could be used to create or define a storage pool of a given *type*. If
*srcSpec* is provided, it is a file that contains XML to further restrict
the query for pools.
Not all storage pools support discovery in this manner. Furthermore, for
those that do support discovery, only specific XML elements are required
in order to return valid data, while other elements and even attributes
of some elements are ignored since they are not necessary to find the pool
based on the search criteria. The following lists the supported *type*
options and the expected minimal XML elements used to perform the search.
For a "netfs" or "gluster" pool, the minimal expected XML required is the
<host> element with a "name" attribute describing the IP address or hostname
to be used to find the pool. The "port" attribute will be ignored as will
any other provided XML elements in *srcSpec*.
For a "logical" pool, the contents of the *srcSpec* file are ignored,
although if provided the file must at least exist.
For an "iscsi" or "iscsi-direct" pool,
the minimal expect XML required is the <host> element
with a "name" attribute describing the IP address or hostname to be used to
find the pool (the iSCSI server address). Optionally, the "port" attribute
may be provided, although it will default to 3260. Optionally, an <initiator>
XML element with a "name" attribute may be provided to further restrict the
iSCSI target search to a specific initiator for multi-iqn iSCSI storage pools.
find-pool-sources-as
--------------------
**Syntax:**
::
find-storage-pool-sources-as type [host] [port] [initiator]
Rather than providing *srcSpec* XML file for ``find-storage-pool-sources``
use this command option in order to have virsh generate the query XML file
using the optional arguments. The command will return the same output
XML as ``find-storage-pool-sources``.
Use *host* to describe a specific host to use for networked storage, such
as netfs, gluster, and iscsi *type* pools.
Use *port* to further restrict which networked port to utilize for the
connection if required by the specific storage backend, such as iscsi.
Use *initiator* to further restrict the iscsi *type* pool searches to
specific target initiators.
pool-autostart
--------------
**Syntax:**
::
pool-autostart pool-or-uuid [--disable]
Configure whether *pool* should automatically start at boot.
pool-build
----------
**Syntax:**
::
pool-build pool-or-uuid [--overwrite] [--no-overwrite]
Build a given pool.
Options *--overwrite* and *--no-overwrite* can only be used for
``pool-build`` a filesystem, disk, or logical pool.
For a file system pool if neither flag is specified, then ``pool-build``
just makes the target path directory and no attempt to run mkfs on the
target volume device. If *--no-overwrite* is specified, it probes to
determine if a filesystem already exists on the target device, returning
an error if one exists or using mkfs to format the target device if not.
If *--overwrite* is specified, mkfs is always executed and any existing
data on the target device is overwritten unconditionally.
For a disk pool, if neither of them is specified or *--no-overwrite*
is specified, ``pool-build`` will check the target volume device for
existing filesystems or partitions before attempting to write a new
label on the target volume device. If the target volume device already
has a label, the command will fail. If *--overwrite* is specified,
then no check will be made on the target volume device prior to writing
a new label. Writing of the label uses the pool source format type
or "dos" if not specified.
For a logical pool, if neither of them is specified or *--no-overwrite*
is specified, ``pool-build`` will check the target volume devices for
existing filesystems or partitions before attempting to initialize
and format each device for usage by the logical pool. If any target
volume device already has a label, the command will fail. If
*--overwrite* is specified, then no check will be made on the target
volume devices prior to initializing and formatting each device. Once
all the target volume devices are properly formatted via pvcreate,
the volume group will be created using all the devices.
pool-create
-----------
**Syntax:**
::
pool-create file [--build] [[--overwrite] | [--no-overwrite]]
Create and start a pool object from the XML *file*.
[*--build*] [[*--overwrite*] | [*--no-overwrite*]] perform a
``pool-build`` after creation in order to remove the need for a
follow-up command to build the pool. The *--overwrite* and
*--no-overwrite* flags follow the same rules as ``pool-build``. If
just *--build* is provided, then ``pool-build`` is called with no flags.
pool-create-as
--------------
**Syntax:**
::
pool-create-as name type
[--source-host hostname] [--source-path path] [--source-dev path]
[--source-name name] [--target path] [--source-format format]
[--source-initiator initiator-iqn]
[--auth-type authtype --auth-username username
[--secret-usage usage | --secret-uuid uuid]]
[--source-protocol-ver ver]
[[--adapter-name name] | [--adapter-wwnn wwnn --adapter-wwpn wwpn]
[--adapter-parent parent |
--adapter-parent-wwnn parent_wwnn adapter-parent-wwpn parent_wwpn |
--adapter-parent-fabric-wwn parent_fabric_wwn]]
[--build] [[--overwrite] | [--no-overwrite]] [--print-xml]
Create and start a pool object *name* from the raw parameters. If
*--print-xml* is specified, then print the XML of the pool object
without creating the pool. Otherwise, the pool has the specified
*type*. When using ``pool-create-as`` for a pool of *type* "disk",
the existing partitions found on the *--source-dev path* will be used
to populate the disk pool. Therefore, it is suggested to use
``pool-define-as`` and ``pool-build`` with the *--overwrite* in order
to properly initialize the disk pool.
[*--source-host hostname*] provides the source hostname for pools backed
by storage from a remote server (pool types netfs, iscsi, rbd, sheepdog,
gluster).
[*--source-path path*] provides the source directory path for pools backed
by directories (pool type dir).
[*--source-dev path*] provides the source path for pools backed by physical
devices (pool types fs, logical, disk, iscsi, zfs).
[*--source-name name*] provides the source name for pools backed by storage
from a named element (pool types logical, rbd, sheepdog, gluster).
[*--target path*] is the path for the mapping of the storage pool into
the host file system.
[*--source-format format*] provides information about the format of the
pool (pool types fs, netfs, disk, logical).
[*--source-initiator initiator-iqn*] provides the initiator iqn for iscsi
connection of the pool (pool type iscsi-direct).
[*--auth-type authtype* *--auth-username username*
[*--secret-usage usage* | *--secret-uuid uuid*]]
provides the elements required to generate authentication credentials for
the storage pool. The *authtype* is either chap for iscsi *type* pools or
ceph for rbd *type* pools. Either the secret *usage* or *uuid* value may
be provided, but not both.
[*--source-protocol-ver ver*] provides the NFS protocol version number used
to contact the server's NFS service via nfs mount option 'nfsvers=n'. It is
expect the *ver* value is an unsigned integer.
[*--adapter-name name*] defines the scsi_hostN adapter name to be used for
the scsi_host adapter type pool.
[*--adapter-wwnn wwnn* *--adapter-wwpn wwpn* [*--adapter-parent parent* |
*--adapter-parent-wwnn parent_wwnn* *adapter-parent-wwpn parent_wwpn* |
*--adapter-parent-fabric-wwn parent_fabric_wwn*]]
defines the wwnn and wwpn to be used for the fc_host adapter type pool.
Optionally provide the parent scsi_hostN node device to be used for the
vHBA either by parent name, parent_wwnn and parent_wwpn, or parent_fabric_wwn.
The parent name could change between reboots if the hardware environment
changes, so providing the parent_wwnn and parent_wwpn ensure usage of the
same physical HBA even if the scsi_hostN node device changes. Usage of the
parent_fabric_wwn allows a bit more flexibility to choose an HBA on the
same storage fabric in order to define the pool.
[*--build*] [[*--overwrite*] | [*--no-overwrite*]] perform a
``pool-build`` after creation in order to remove the need for a
follow-up command to build the pool. The *--overwrite* and
*--no-overwrite* flags follow the same rules as ``pool-build``. If
just *--build* is provided, then ``pool-build`` is called with no flags.
For a "logical" pool only [*--name*] needs to be provided. The
[*--source-name*] if provided must match the Volume Group name.
If not provided, one will be generated using the [*--name*]. If
provided the [*--target*] is ignored and a target source is generated
using the [*--source-name*] (or as generated from the [*--name*]).
pool-define
-----------
**Syntax:**
::
pool-define file
Define an inactive persistent storage pool or modify an existing persistent one
from the XML *file*.
pool-define-as
--------------
**Syntax:**
::
pool-define-as name type
[--source-host hostname] [--source-path path] [--source-dev path]
[*--source-name name*] [*--target path*] [*--source-format format*]
[--source-initiator initiator-iqn]
[*--auth-type authtype* *--auth-username username*
[*--secret-usage usage* | *--secret-uuid uuid*]]
[*--source-protocol-ver ver*]
[[*--adapter-name name*] | [*--adapter-wwnn* *--adapter-wwpn*]
[*--adapter-parent parent*]] [*--print-xml*]
Create, but do not start, a pool object *name* from the raw parameters. If
*--print-xml* is specified, then print the XML of the pool object
without defining the pool. Otherwise, the pool has the specified
*type*.
Use the same arguments as ``pool-create-as``, except for the *--build*,
*--overwrite*, and *--no-overwrite* options.
pool-destroy
------------
**Syntax:**
::
pool-destroy pool-or-uuid
Destroy (stop) a given *pool* object. Libvirt will no longer manage the
storage described by the pool object, but the raw data contained in
the pool is not changed, and can be later recovered with
``pool-create``.
pool-delete
-----------
**Syntax:**
::
pool-delete pool-or-uuid
Destroy the resources used by a given *pool* object. This operation
is non-recoverable. The *pool* object will still exist after this
command, ready for the creation of new storage volumes.
pool-dumpxml
------------
**Syntax:**
::
pool-dumpxml [--inactive] pool-or-uuid
Returns the XML information about the *pool* object.
*--inactive* tells virsh to dump pool configuration that will be used
on next start of the pool as opposed to the current pool configuration.
pool-edit
---------
**Syntax:**
::
pool-edit pool-or-uuid
Edit the XML configuration file for a storage pool.
This is equivalent to:
::
virsh pool-dumpxml pool > pool.xml
vi pool.xml (or make changes with your other text editor)
virsh pool-define pool.xml
except that it does some error checking.
The editor used can be supplied by the ``$VISUAL`` or ``$EDITOR`` environment
variables, and defaults to ``vi``.
pool-info
---------
**Syntax:**
::
pool-info [--bytes] pool-or-uuid
Returns basic information about the *pool* object. If *--bytes* is specified the sizes
of basic info are not converted to human friendly units.
pool-list
---------
**Syntax:**
::
pool-list [--inactive] [--all]
[--persistent] [--transient]
[--autostart] [--no-autostart]
[[--details] [--uuid]
[--name] [<type>]
List pool objects known to libvirt. By default, only active pools
are listed; *--inactive* lists just the inactive pools, and *--all*
lists all pools.
In addition, there are several sets of filtering flags. *--persistent* is to
list the persistent pools, *--transient* is to list the transient pools.
*--autostart* lists the autostarting pools, *--no-autostart* lists the pools
with autostarting disabled. If *--uuid* is specified only pool's UUIDs are printed.
If *--name* is specified only pool's names are printed. If both *--name*
and *--uuid* are specified, pool's UUID and names are printed side by side
without any header. Option *--details* is mutually exclusive with options
*--uuid* and *--name*.
You may also want to list pools with specified types using *type*, the
pool types must be separated by comma, e.g. --type dir,disk. The valid pool
types include 'dir', 'fs', 'netfs', 'logical', 'disk', 'iscsi', 'scsi',
'mpath', 'rbd', 'sheepdog', 'gluster', 'zfs', 'vstorage' and 'iscsi-direct'.
The *--details* option instructs virsh to additionally
display pool persistence and capacity related information where available.
NOTE: When talking to older servers, this command is forced to use a series of
API calls with an inherent race, where a pool might not be listed or might appear
more than once if it changed state between calls while the list was being
collected. Newer servers do not have this problem.
pool-name
---------
**Syntax:**
::
pool-name uuid
Convert the *uuid* to a pool name.
pool-refresh
------------
**Syntax:**
::
pool-refresh pool-or-uuid
Refresh the list of volumes contained in *pool*.
pool-start
----------
**Syntax:**
::
pool-start pool-or-uuid [--build] [[--overwrite] | [--no-overwrite]]
Start the storage *pool*, which is previously defined but inactive.
[*--build*] [[*--overwrite*] | [*--no-overwrite*]] perform a
``pool-build`` prior to ``pool-start`` to ensure the pool environment is
in an expected state rather than needing to run the build command prior
to startup. The *--overwrite* and *--no-overwrite* flags follow the
same rules as ``pool-build``. If just *--build* is provided, then
``pool-build`` is called with no flags.
``Note``: A storage pool that relies on remote resources such as an
"iscsi" or a (v)HBA backed "scsi" pool may need to be refreshed multiple
times in order to have all the volumes detected (see ``pool-refresh``).
This is because the corresponding volume devices may not be present in
the host's filesystem during the initial pool startup or the current
refresh attempt. The number of refresh retries is dependent upon the
network connection and the time the host takes to export the
corresponding devices.
pool-undefine
-------------
**Syntax:**
::
pool-undefine pool-or-uuid
Undefine the configuration for an inactive *pool*.
pool-uuid
---------
**Syntax:**
::
pool-uuid pool
Returns the UUID of the named *pool*.
pool-event
----------
**Syntax:**
::
pool-event {[pool] event [--loop] [--timeout seconds] [--timestamp] | --list}
Wait for a class of storage pool events to occur, and print appropriate
details of events as they happen. The events can optionally be filtered
by *pool*. Using *--list* as the only argument will provide a list
of possible *event* values known by this client, although the connection
might not allow registering for all these events.
By default, this command is one-shot, and returns success once an event
occurs; you can send SIGINT (usually via ``Ctrl-C``) to quit immediately.
If *--timeout* is specified, the command gives up waiting for events
after *seconds* have elapsed. With *--loop*, the command prints all
events until a timeout or interrupt key.
When *--timestamp* is used, a human-readable timestamp will be printed
before the event.
VOLUME COMMANDS
===============
vol-create
----------
**Syntax:**
::
vol-create pool-or-uuid FILE [--prealloc-metadata]
Create a volume from an XML <file>.
*pool-or-uuid* is the name or UUID of the storage pool to create the volume in.
*FILE* is the XML <file> with the volume definition. An easy way to create the
XML <file> is to use the ``vol-dumpxml`` command to obtain the definition of a
pre-existing volume.
[*--prealloc-metadata*] preallocate metadata (for qcow2 images which don't
support full allocation). This option creates a sparse image file with metadata,
resulting in higher performance compared to images with no preallocation and
only slightly higher initial disk space usage.
**Example:**
::
virsh vol-dumpxml --pool storagepool1 appvolume1 > newvolume.xml
vi newvolume.xml (or make changes with your other text editor)
virsh vol-create differentstoragepool newvolume.xml
vol-create-from
---------------
**Syntax:**
::
vol-create-from pool-or-uuid FILE vol-name-or-key-or-path
[--inputpool pool-or-uuid] [--prealloc-metadata] [--reflink]
Create a volume, using another volume as input.
*pool-or-uuid* is the name or UUID of the storage pool to create the volume in.
*FILE* is the XML <file> with the volume definition.
*vol-name-or-key-or-path* is the name or key or path of the source volume.
*--inputpool* *pool-or-uuid* is the name or uuid of the storage pool the
source volume is in.
[*--prealloc-metadata*] preallocate metadata (for qcow2 images which don't
support full allocation). This option creates a sparse image file with metadata,
resulting in higher performance compared to images with no preallocation and
only slightly higher initial disk space usage.
When *--reflink* is specified, perform a COW lightweight copy,
where the data blocks are copied only when modified.
If this is not possible, the copy fails.
vol-create-as
-------------
**Syntax:**
::
vol-create-as pool-or-uuid name capacity [--allocation size] [--format string]
[--backing-vol vol-name-or-key-or-path]
[--backing-vol-format string] [--prealloc-metadata] [--print-xml]
Create a volume from a set of arguments unless *--print-xml* is specified, in
which case just the XML of the volume object is printed out without any actual
object creation.
*pool-or-uuid* is the name or UUID of the storage pool to create the volume
in.
*name* is the name of the new volume. For a disk pool, this must match the
partition name as determined from the pool's source device path and the next
available partition. For example, a source device path of /dev/sdb and there
are no partitions on the disk, then the name must be sdb1 with the next
name being sdb2 and so on.
*capacity* is the size of the volume to be created, as a scaled integer
(see ``NOTES`` above), defaulting to bytes if there is no suffix.
*--allocation* *size* is the initial size to be allocated in the volume,
also as a scaled integer defaulting to bytes.
*--format* *string* is used in file based storage pools to specify the volume
file format to use; raw, bochs, qcow, qcow2, vmdk, qed. Use extended for disk
storage pools in order to create an extended partition (other values are
validity checked but not preserved when libvirtd is restarted or the pool
is refreshed).
*--backing-vol* *vol-name-or-key-or-path* is the source backing
volume to be used if taking a snapshot of an existing volume.
*--backing-vol-format* *string* is the format of the snapshot backing volume;
raw, bochs, qcow, qcow2, qed, vmdk, host_device. These are, however, meant for
file based storage pools.
[*--prealloc-metadata*] preallocate metadata (for qcow2 images which don't
support full allocation). This option creates a sparse image file with metadata,
resulting in higher performance compared to images with no preallocation and
only slightly higher initial disk space usage.
vol-clone
---------
**Syntax:**
::
vol-clone vol-name-or-key-or-path name
[--pool pool-or-uuid] [--prealloc-metadata] [--reflink]
Clone an existing volume within the parent pool. Less powerful,
but easier to type, version of ``vol-create-from``.
*vol-name-or-key-or-path* is the name or key or path of the source volume.
*name* is the name of the new volume.
*--pool* *pool-or-uuid* is the name or UUID of the storage pool
that contains the source volume and will contain the new volume.
If the source volume name is provided instead of the key or path, then
providing the pool is necessary to find the volume to be cloned; otherwise,
the first volume found by the key or path will be used.
[*--prealloc-metadata*] preallocate metadata (for qcow2 images which don't
support full allocation). This option creates a sparse image file with metadata,
resulting in higher performance compared to images with no preallocation and
only slightly higher initial disk space usage.
When *--reflink* is specified, perform a COW lightweight copy,
where the data blocks are copied only when modified.
If this is not possible, the copy fails.
vol-delete
----------
**Syntax:**
::
vol-delete vol-name-or-key-or-path [--pool pool-or-uuid] [--delete-snapshots]
Delete a given volume.
*vol-name-or-key-or-path* is the volume name or key or path of the volume
to delete.
[*--pool* *pool-or-uuid*] is the name or UUID of the storage pool the volume
is in. If the volume name is provided instead of the key or path, then
providing the pool is necessary to find the volume to be deleted; otherwise,
the first volume found by the key or path will be used.
The *--delete-snapshots* flag specifies that any snapshots associated with
the storage volume should be deleted as well. Not all storage drivers
support this option, presently only rbd.
vol-upload
----------
**Syntax:**
::
vol-upload vol-name-or-key-or-path local-file
[--pool pool-or-uuid] [--offset bytes]
[--length bytes] [--sparse]
Upload the contents of *local-file* to a storage volume.
*vol-name-or-key-or-path* is the name or key or path of the volume where the
*local-file* will be uploaded.
*--pool* *pool-or-uuid* is the name or UUID of the storage pool the volume
is in. If the volume name is provided instead of the key or path, then
providing the pool is necessary to find the volume to be uploaded into;
otherwise, the first volume found by the key or path will be used.
*--offset* is the position in the storage volume at which to start writing
the data. The value must be 0 or larger.
*--length* is an upper bound of the amount of data to be uploaded.
A negative value is interpreted as an unsigned long long value to
essentially include everything from the offset to the end of the volume.
If *--sparse* is specified, this command will preserve volume sparseness.
An error will occur if the *local-file* is greater than the specified
*length*.
See the description for the libvirt virStorageVolUpload API for details
regarding possible target volume and pool changes as a result of the
pool refresh when the upload is attempted.
vol-download
------------
**Syntax:**
::
vol-download vol-name-or-key-or-path local-file
[--pool pool-or-uuid] [--offset bytes] [--length bytes]
[--sparse]
Download the contents of a storage volume to *local-file*.
*vol-name-or-key-or-path* is the name or key or path of the volume to
download into *local-file*.
*--pool* *pool-or-uuid* is the name or UUID of the storage pool the volume
is in. If the volume name is provided instead of the key or path, then
providing the pool is necessary to find the volume to be uploaded into;
otherwise, the first volume found by the key or path will be used.
*--offset* is the position in the storage volume at which to start reading
the data. The value must be 0 or larger.
*--length* is an upper bound of the amount of data to be downloaded.
A negative value is interpreted as an unsigned long long value to
essentially include everything from the offset to the end of the volume.
If *--sparse* is specified, this command will preserve volume sparseness.
vol-wipe
--------
**Syntax:**
::
vol-wipe vol-name-or-key-or-path [--pool pool-or-uuid] [--algorithm algorithm]
Wipe a volume, ensure data previously on the volume is not accessible to
future reads.
*vol-name-or-key-or-path* is the name or key or path of the volume to wipe.
It is possible to choose different wiping algorithms instead of re-writing
volume with zeroes.
*--pool* *pool-or-uuid* is the name or UUID of the storage pool the
volume is in. If the volume name is provided instead of the key or path,
then providing the pool is necessary to find the volume to be wiped;
otherwise, the first volume found by the key or path will be used.
Use the *--algorithm* switch choosing from the list of the following
algorithms in order to define which algorithm to use for the wipe.
``Supported algorithms``
* zero - 1-pass all zeroes
* nnsa - 4-pass NNSA Policy Letter NAP-14.1-C (XVI-8) for
sanitizing removable and non-removable hard disks:
random x2, 0x00, verify.
* dod - 4-pass DoD 5220.22-M section 8-306 procedure for
sanitizing removable and non-removable rigid
disks: random, 0x00, 0xff, verify.
* bsi - 9-pass method recommended by the German Center of
Security in Information Technologies
(https://www.bsi.bund.de): 0xff, 0xfe, 0xfd, 0xfb,
0xf7, 0xef, 0xdf, 0xbf, 0x7f.
* gutmann - The canonical 35-pass sequence described in
Gutmann's paper.
* schneier - 7-pass method described by Bruce Schneier in
"Applied Cryptography" (1996): 0x00, 0xff, random x5.
* pfitzner7 - Roy Pfitzner's 7-random-pass method: random x7.
* pfitzner33 - Roy Pfitzner's 33-random-pass method: random x33.
* random - 1-pass pattern: random.
* trim - 1-pass trimming the volume using TRIM or DISCARD
``Note``: The ``scrub`` binary will be used to handle the 'nnsa', 'dod',
'bsi', 'gutmann', 'schneier', 'pfitzner7' and 'pfitzner33' algorithms.
The availability of the algorithms may be limited by the version of
the ``scrub`` binary installed on the host. The 'zero' algorithm will
write zeroes to the entire volume. For some volumes, such as sparse
or rbd volumes, this may result in completely filling the volume with
zeroes making it appear to be completely full. As an alternative, the
'trim' algorithm does not overwrite all the data in a volume, rather
it expects the storage driver to be able to discard all bytes in a
volume. It is up to the storage driver to handle how the discarding
occurs. Not all storage drivers or volume types can support 'trim'.
vol-dumpxml
-----------
**Syntax:**
::
vol-dumpxml vol-name-or-key-or-path [--pool pool-or-uuid]
Output the volume information as an XML dump to stdout.
*vol-name-or-key-or-path* is the name or key or path of the volume
to output the XML.
*--pool* *pool-or-uuid* is the name or UUID of the storage pool the volume
is in. If the volume name is provided instead of the key or path, then
providing the pool is necessary to find the volume to be uploaded into;
otherwise, the first volume found by the key or path will be used.
vol-info
--------
**Syntax:**
::
vol-info vol-name-or-key-or-path [--pool pool-or-uuid] [--bytes] [--physical]
Returns basic information about the given storage volume.
*vol-name-or-key-or-path* is the name or key or path of the volume
to return information for.
*--pool* *pool-or-uuid* is the name or UUID of the storage pool the volume
is in. If the volume name is provided instead of the key or path, then
providing the pool is necessary to find the volume to be uploaded into;
otherwise, the first volume found by the key or path will be used.
If *--bytes* is specified the sizes are not converted to human friendly
units.
If *--physical* is specified, then the host physical size is returned
and displayed instead of the allocation value. The physical value for
some file types, such as qcow2 may have a different (larger) physical
value than is shown for allocation. Additionally sparse files will
have different physical and allocation values.
vol-list
--------
**Syntax:**
::
vol-list [--pool pool-or-uuid] [--details]
Return the list of volumes in the given storage pool.
*--pool* *pool-or-uuid* is the name or UUID of the storage pool.
The *--details* option instructs virsh to additionally display volume
type and capacity related information where available.
vol-pool
--------
**Syntax:**
::
vol-pool vol-key-or-path [--uuid]
Return the pool name or UUID for a given volume. By default, the pool name is
returned.
*vol-key-or-path* is the key or path of the volume to return the pool
information.
If the *--uuid* option is given, the pool UUID is returned instead.
vol-path
--------
**Syntax:**
::
vol-path vol-name-or-key [--pool pool-or-uuid]
Return the path for a given volume.
*vol-name-or-key* is the name or key of the volume to return the path.
*--pool* *pool-or-uuid* is the name or UUID of the storage pool the volume
is in. If the volume name is provided instead of the key, then providing
the pool is necessary to find the volume to be uploaded into; otherwise,
the first volume found by the key will be used.
vol-name
--------
**Syntax:**
::
vol-name vol-key-or-path
Return the name for a given volume.
*vol-key-or-path* is the key or path of the volume to return the name.
vol-key
-------
**Syntax:**
::
vol-key vol-name-or-path [--pool pool-or-uuid]
Return the volume key for a given volume.
*vol-name-or-path* is the name or path of the volume to return the
volume key.
*--pool* *pool-or-uuid* is the name or UUID of the storage pool the volume
is in. If the volume name is provided instead of the path, then providing
the pool is necessary to find the volume to be uploaded into; otherwise,
the first volume found by the path will be used.
vol-resize
----------
**Syntax:**
::
vol-resize vol-name-or-path capacity [--pool pool-or-uuid] [--allocate] [--delta] [--shrink]
Resize the capacity of the given volume, in bytes.
*vol-name-or-key-or-path* is the name or key or path of the volume
to resize.
*capacity* is a scaled integer (see ``NOTES`` above) for the volume,
which defaults to bytes if there is no suffix.
*--pool* *pool-or-uuid* is the name or UUID of the storage pool the volume
is in. If the volume name is provided instead of the key or path, then
providing the pool is necessary to find the volume to be uploaded into;
otherwise, the first volume found by the key or path will be used.
The new *capacity* might be sparse unless *--allocate* is specified.
Normally, *capacity* is the new size, but if *--delta*
is present, then it is added to the existing size.
Attempts to shrink the volume will fail unless *--shrink* is present.
The *capacity* cannot be negative unless *--shrink* is provided, but
a negative sign is not necessary.
This command is only safe for storage volumes not in use by an active
guest; see also ``blockresize`` for live resizing.
SECRET COMMANDS
===============
The following commands manipulate "secrets" (e.g. passwords, passphrases and
encryption keys). Libvirt can store secrets independently from their use, and
other objects (e.g. volumes or domains) can refer to the secrets for encryption
or possibly other uses. Secrets are identified using a UUID. See
`https://libvirt.org/formatsecret.html <https://libvirt.org/formatsecret.html>`_ for documentation of the XML format
used to represent properties of secrets.
secret-define
-------------
**Syntax:**
::
secret-define file
Create a secret with the properties specified in *file*, with no associated
secret value. If *file* does not specify a UUID, choose one automatically.
If *file* specifies a UUID of an existing secret, replace its properties by
properties defined in *file*, without affecting the secret value.
secret-dumpxml
--------------
**Syntax:**
::
secret-dumpxml secret
Output properties of *secret* (specified by its UUID) as an XML dump to stdout.
secret-event
------------
**Syntax:**
::
secret-event {[secret] event [--loop] [--timeout seconds] [--timestamp] | --list}
Wait for a class of secret events to occur, and print appropriate details
of events as they happen. The events can optionally be filtered by
*secret*. Using *--list* as the only argument will provide a list
of possible *event* values known by this client, although the connection
might not allow registering for all these events.
By default, this command is one-shot, and returns success once an event
occurs; you can send SIGINT (usually via ``Ctrl-C``) to quit immediately.
If *--timeout* is specified, the command gives up waiting for events
after *seconds* have elapsed. With *--loop*, the command prints all
events until a timeout or interrupt key.
When *--timestamp* is used, a human-readable timestamp will be printed
before the event.
secret-set-value
----------------
**Syntax:**
::
secret-set-value secret (--file filename [--plain] | --interactive | base64)
Set the value associated with *secret* (specified by its UUID) to the value
Base64-encoded value *base64* or Base-64-encoded contents of file named
*filename*. Using the *--plain* flag is together with *--file* allows one to
use the file contents directly as the secret value.
If *--interactive* flag is used the secret value is read as a password from the
terminal.
Note that *--file*, *--interactive* and *base64* options are mutually exclusive.
Passing secrets via the *base64* option on command line is INSECURE and
deprecated. Use the *--file* option instead.
secret-get-value
----------------
**Syntax:**
::
secret-get-value [--plain] secret
Output the value associated with *secret* (specified by its UUID) to stdout,
encoded using Base64.
If the *--plain* flag is used the value is not base64 encoded, but rather
printed raw. Note that unless virsh is started in quiet mode (*virsh -q*) it
prints a newline at the end of the command. This newline is not part of the
secret.
secret-undefine
---------------
**Syntax:**
::
secret-undefine secret
Delete a *secret* (specified by its UUID), including the associated value, if
any.
secret-list
-----------
**Syntax:**
::
secret-list [--ephemeral] [--no-ephemeral]
[--private] [--no-private]
Returns the list of secrets. You may also want to filter the returned secrets
by *--ephemeral* to list the ephemeral ones, *--no-ephemeral* to list the
non-ephemeral ones, *--private* to list the private ones, and
*--no-private* to list the non-private ones.
SNAPSHOT COMMANDS
=================
The following commands manipulate domain snapshots. Snapshots take the
disk, memory, and device state of a domain at a point-of-time, and save it
for future use. They have many uses, from saving a "clean" copy of an OS
image to saving a domain's state before a potentially destructive operation.
Snapshots are identified with a unique name. See
`https://libvirt.org/formatsnapshot.html <https://libvirt.org/formatsnapshot.html>`_ for documentation of the XML format
used to represent properties of snapshots.
snapshot-create
---------------
**Syntax:**
::
snapshot-create domain [xmlfile] {[--redefine [--current]] |
[--no-metadata] [--halt] [--disk-only] [--reuse-external]
[--quiesce] [--atomic] [--live]} [--validate]
Create a snapshot for domain *domain* with the properties specified in
*xmlfile*. Optionally, the *--validate* option can be passed to
validate the format of the input XML file against an internal RNG
schema (identical to using the virt-xml-validate(1) tool). Normally,
the only properties settable for a domain snapshot
are the <name> and <description> elements, as well as <disks> if
*--disk-only* is given; the rest of the fields are
ignored, and automatically filled in by libvirt. If *xmlfile* is
completely omitted, then libvirt will choose a value for all fields.
The new snapshot will become current, as listed by ``snapshot-current``.
If *--halt* is specified, the domain will be left in an inactive state
after the snapshot is created.
If *--disk-only* is specified, the snapshot will only include disk
content rather than the usual full system snapshot with vm state. Disk
snapshots are captured faster than full system snapshots, but reverting to a
disk snapshot may require fsck or journal replays, since it is like
the disk state at the point when the power cord is abruptly pulled;
and mixing *--halt* and *--disk-only* loses any data that was not
flushed to disk at the time.
If *--redefine* is specified, then all XML elements produced by
``snapshot-dumpxml`` are valid; this can be used to migrate snapshot
hierarchy from one machine to another, to recreate hierarchy for the
case of a transient domain that goes away and is later recreated with
the same name and UUID, or to make slight alterations in the snapshot
metadata (such as host-specific aspects of the domain XML embedded in
the snapshot). When this flag is supplied, the *xmlfile* argument
is mandatory, and the domain's current snapshot will not be altered
unless the *--current* flag is also given.
If *--no-metadata* is specified, then the snapshot data is created,
but any metadata is immediately discarded (that is, libvirt does not
treat the snapshot as current, and cannot revert to the snapshot
unless *--redefine* is later used to teach libvirt about the
metadata again).
If *--reuse-external* is specified, and the snapshot XML requests an
external snapshot with a destination of an existing file, then the
destination must exist and be pre-created with correct format and
metadata. The file is then reused; otherwise, a snapshot is refused
to avoid losing contents of the existing files.
If *--quiesce* is specified, libvirt will try to use guest agent
to freeze and unfreeze domain's mounted file systems. However,
if domain has no guest agent, snapshot creation will fail.
Currently, this requires *--disk-only* to be passed as well.
If *--atomic* is specified, libvirt will guarantee that the snapshot
either succeeds, or fails with no changes; not all hypervisors support
this. If this flag is not specified, then some hypervisors may fail
after partially performing the action, and ``dumpxml`` must be used to
see whether any partial changes occurred.
If *--live* is specified, libvirt takes the snapshot while
the guest is running. Both disk snapshot and domain memory snapshot are
taken. This increases the size of the memory image of the external
snapshot. This is currently supported only for full system external snapshots.
Existence of snapshot metadata will prevent attempts to ``undefine``
a persistent guest. However, for transient domains, snapshot
metadata is silently lost when the domain quits running (whether
by command such as ``destroy`` or by internal guest action).
For now, it is not possible to create snapshots in a domain that has
checkpoints, although this restriction will be lifted in a future
release.
snapshot-create-as
------------------
**Syntax:**
::
snapshot-create-as domain {[--print-xml] [--no-metadata]
[--halt] [--reuse-external]} [name]
[description] [--disk-only [--quiesce]] [--atomic]
[[--live] [--memspec memspec]] [--diskspec] diskspec]...
Create a snapshot for domain *domain* with the given <name> and
<description>; if either value is omitted, libvirt will choose a
value. If *--print-xml* is specified, then XML appropriate for
*snapshot-create* is output, rather than actually creating a snapshot.
Otherwise, if *--halt* is specified, the domain will be left in an
inactive state after the snapshot is created, and if *--disk-only*
is specified, the snapshot will not include vm state.
The *--memspec* option can be used to control whether a full system snapshot
is internal or external. The *--memspec* flag is mandatory, followed
by a ``memspec`` of the form ``[file=]name[,snapshot=type]``, where
type can be ``no``, ``internal``, or ``external``. To include a literal
comma in ``file=name``, escape it with a second comma. *--memspec* cannot
be used together with *--disk-only*.
The *--diskspec* option can be used to control how *--disk-only* and
external full system snapshots create external files. This option can occur
multiple times, according to the number of <disk> elements in the domain
xml. Each <diskspec> is in the
form ``disk[,snapshot=type][,driver=type][,stype=type][,file=name]``.
A *diskspec* must be provided for disks backed by block devices as libvirt
doesn't auto-generate file names for those. The optional ``stype`` parameter
allows one to control the type of the source file. Supported values are 'file'
(default) and 'block'. To exclude a disk from an external snapshot use
``--diskspec disk,snapshot=no``.
To include a literal comma in ``disk`` or in ``file=name``, escape it with a
second comma. A literal *--diskspec* must precede each ``diskspec`` unless
all three of *domain*, *name*, and *description* are also present.
For example, a diskspec of "vda,snapshot=external,file=/path/to,,new"
results in the following XML:
::
<disk name='vda' snapshot='external'>
<source file='/path/to,new'/>
</disk>
If *--reuse-external* is specified, and the domain XML or *diskspec*
option requests an external snapshot with a destination of an existing
file, then the destination must exist and be pre-created with correct
format and metadata. The file is then reused; otherwise, a snapshot
is refused to avoid losing contents of the existing files.
If *--quiesce* is specified, libvirt will try to use guest agent
to freeze and unfreeze domain's mounted file systems. However,
if domain has no guest agent, snapshot creation will fail.
Currently, this requires *--disk-only* to be passed as well.
If *--no-metadata* is specified, then the snapshot data is created,
but any metadata is immediately discarded (that is, libvirt does not
treat the snapshot as current, and cannot revert to the snapshot
unless ``snapshot-create`` is later used to teach libvirt about the
metadata again).
If *--atomic* is specified, libvirt will guarantee that the snapshot
either succeeds, or fails with no changes; not all hypervisors support
this. If this flag is not specified, then some hypervisors may fail
after partially performing the action, and ``dumpxml`` must be used to
see whether any partial changes occurred.
If *--live* is specified, libvirt takes the snapshot while the guest is
running. This increases the size of the memory image of the external
snapshot. This is currently supported only for external full system snapshots.
For now, it is not possible to create snapshots in a domain that has
checkpoints, although this restriction will be lifted in a future
release.
snapshot-current
----------------
**Syntax:**
::
snapshot-current domain {[--name] | [--security-info] | [snapshotname]}
Without *snapshotname*, this will output the snapshot XML for the domain's
current snapshot (if any). If *--name* is specified, just the
current snapshot name instead of the full xml. Otherwise, using
*--security-info* will also include security sensitive information in
the XML.
With *snapshotname*, this is a request to make the existing named
snapshot become the current snapshot, without reverting the domain.
snapshot-edit
-------------
**Syntax:**
::
snapshot-edit domain [snapshotname] [--current] {[--rename] | [--clone]}
Edit the XML configuration file for *snapshotname* of a domain. If
both *snapshotname* and *--current* are specified, also force the
edited snapshot to become the current snapshot. If *snapshotname*
is omitted, then *--current* must be supplied, to edit the current
snapshot.
This is equivalent to:
::
virsh snapshot-dumpxml dom name > snapshot.xml
vi snapshot.xml (or make changes with your other text editor)
virsh snapshot-create dom snapshot.xml --redefine [--current]
except that it does some error checking.
The editor used can be supplied by the ``$VISUAL`` or ``$EDITOR`` environment
variables, and defaults to ``vi``.
If *--rename* is specified, then the edits can change the snapshot
name. If *--clone* is specified, then changing the snapshot name
will create a clone of the snapshot metadata. If neither is specified,
then the edits must not change the snapshot name. Note that changing
a snapshot name must be done with care, since the contents of some
snapshots, such as internal snapshots within a single qcow2 file, are
accessible only from the original name.
snapshot-info
-------------
**Syntax:**
::
snapshot-info domain {snapshot | --current}
Output basic information about a named <snapshot>, or the current snapshot
with *--current*.
snapshot-list
-------------
**Syntax:**
::
snapshot-list domain [--metadata] [--no-metadata]
[{--parent | --roots | [{--tree | --name}]}] [--topological]
[{[--from] snapshot | --current} [--descendants]]
[--leaves] [--no-leaves] [--inactive] [--active]
[--disk-only] [--internal] [--external]
List all of the available snapshots for the given domain, defaulting
to show columns for the snapshot name, creation time, and domain state.
Normally, table form output is sorted by snapshot name; using
*--topological* instead sorts so that no child is listed before its
ancestors (although there may be more than one possible ordering with
this property).
If *--parent* is specified, add a column to the output table giving
the name of the parent of each snapshot. If *--roots* is specified,
the list will be filtered to just snapshots that have no parents.
If *--tree* is specified, the output will be in a tree format, listing
just snapshot names. These three options are mutually exclusive. If
*--name* is specified only the snapshot name is printed. This option is
mutually exclusive with *--tree*.
If *--from* is provided, filter the list to snapshots which are
children of the given ``snapshot``; or if *--current* is provided,
start at the current snapshot. When used in isolation or with
*--parent*, the list is limited to direct children unless
*--descendants* is also present. When used with *--tree*, the
use of *--descendants* is implied. This option is not compatible
with *--roots*. Note that the starting point of *--from* or
*--current* is not included in the list unless the *--tree*
option is also present.
If *--leaves* is specified, the list will be filtered to just
snapshots that have no children. Likewise, if *--no-leaves* is
specified, the list will be filtered to just snapshots with
children. (Note that omitting both options does no filtering,
while providing both options will either produce the same list
or error out depending on whether the server recognizes the flags).
Filtering options are not compatible with *--tree*.
If *--metadata* is specified, the list will be filtered to just
snapshots that involve libvirt metadata, and thus would prevent
``undefine`` of a persistent guest, or be lost on ``destroy`` of
a transient domain. Likewise, if *--no-metadata* is specified,
the list will be filtered to just snapshots that exist without
the need for libvirt metadata.
If *--inactive* is specified, the list will be filtered to snapshots
that were taken when the domain was shut off. If *--active* is
specified, the list will be filtered to snapshots that were taken
when the domain was running, and where the snapshot includes the
memory state to revert to that running state. If *--disk-only* is
specified, the list will be filtered to snapshots that were taken
when the domain was running, but where the snapshot includes only
disk state.
If *--internal* is specified, the list will be filtered to snapshots
that use internal storage of existing disk images. If *--external*
is specified, the list will be filtered to snapshots that use external
files for disk images or memory state.
snapshot-dumpxml
----------------
**Syntax:**
::
snapshot-dumpxml domain snapshot [--security-info]
Output the snapshot XML for the domain's snapshot named *snapshot*.
Using *--security-info* will also include security sensitive information.
Use ``snapshot-current`` to easily access the XML of the current snapshot.
snapshot-parent
---------------
**Syntax:**
::
snapshot-parent domain {snapshot | --current}
Output the name of the parent snapshot, if any, for the given
*snapshot*, or for the current snapshot with *--current*.
snapshot-revert
---------------
**Syntax:**
::
snapshot-revert domain {snapshot | --current} [{--running | --paused}] [--force]
Revert the given domain to the snapshot specified by *snapshot*, or to
the current snapshot with *--current*. Be aware
that this is a destructive action; any changes in the domain since the last
snapshot was taken will be lost. Also note that the state of the domain after
snapshot-revert is complete will be the state of the domain at the time
the original snapshot was taken.
Normally, reverting to a snapshot leaves the domain in the state it was
at the time the snapshot was created, except that a disk snapshot with
no vm state leaves the domain in an inactive state. Passing either the
*--running* or *--paused* flag will perform additional state changes
(such as booting an inactive domain, or pausing a running domain). Since
transient domains cannot be inactive, it is required to use one of these
flags when reverting to a disk snapshot of a transient domain.
There are a number of cases where a snapshot revert involves extra risk, which
requires the use of *--force* to proceed:
* One is the case of a snapshot that lacks full domain information for
reverting configuration (such as snapshots created prior to libvirt
0.9.5); since libvirt cannot prove that the current configuration matches
what was in use at the time of the snapshot, supplying *--force* assures
libvirt that the snapshot is compatible with the current configuration
(and if it is not, the domain will likely fail to run).
* Another is the case of reverting from a running domain to an active
state where a new hypervisor has to be created rather than reusing the
existing hypervisor, because it implies drawbacks such as breaking any
existing VNC or Spice connections; this condition happens with an active
snapshot that uses a provably incompatible configuration, as well as with
an inactive snapshot that is combined with the *--start* or *--pause*
flag.
* Also, libvirt will refuse to restore snapshots of inactive QEMU domains
while there is managed saved state. This is because those snapshots do not
contain memory state and will therefore not replace the existing memory
state. This ends up switching a disk underneath a running system and will
likely cause extensive filesystem corruption or crashes due to swap content
mismatches when run.
snapshot-delete
---------------
**Syntax:**
::
snapshot-delete domain {snapshot | --current}
[--metadata] [{--children | --children-only}]
Delete the snapshot for the domain named *snapshot*, or the current
snapshot with *--current*. If this snapshot
has child snapshots, changes from this snapshot will be merged into the
children. If *--children* is passed, then delete this snapshot and any
children of this snapshot. If *--children-only* is passed, then delete
any children of this snapshot, but leave this snapshot intact. These
two flags are mutually exclusive.
If *--metadata* is specified, then only delete the snapshot metadata
maintained by libvirt, while leaving the snapshot contents intact for
access by external tools; otherwise deleting a snapshot also removes
the data contents from that point in time.
CHECKPOINT COMMANDS
===================
The following commands manipulate domain checkpoints. Checkpoints serve as
a point in time to identify which portions of a guest's disks have changed
after that time, making it possible to perform incremental and differential
backups. Checkpoints are identified with a unique name. See
`https://libvirt.org/formatcheckpoint.html <https://libvirt.org/formatcheckpoint.html>`_ for documentation of the XML
format used to represent properties of checkpoints.
checkpoint-create
-----------------
**Syntax:**
::
checkpoint-create domain [xmlfile] { --redefine | [--quiesce]}
Create a checkpoint for domain *domain* with the properties specified
in *xmlfile* describing a <domaincheckpoint> top-level element. The
format of the input XML file will be validated against an internal RNG
schema (identical to using the virt-xml-validate(1) tool). If
*xmlfile* is completely omitted, then libvirt will create a
checkpoint with a name based on the current time.
If *--redefine* is specified, then all XML elements produced by
``checkpoint-dumpxml`` are valid; this can be used to migrate
checkpoint hierarchy from one machine to another, to recreate
hierarchy for the case of a transient domain that goes away and is
later recreated with the same name and UUID, or to make slight
alterations in the checkpoint metadata (such as host-specific aspects
of the domain XML embedded in the checkpoint). When this flag is
supplied, the *xmlfile* argument is mandatory.
If *--quiesce* is specified, libvirt will try to use guest agent
to freeze and unfreeze domain's mounted file systems. However,
if domain has no guest agent, checkpoint creation will fail.
Existence of checkpoint metadata will prevent attempts to ``undefine``
a persistent guest. However, for transient domains, checkpoint
metadata is silently lost when the domain quits running (whether
by command such as ``destroy`` or by internal guest action).
For now, it is not possible to create checkpoints in a domain that has
snapshots, although this restriction will be lifted in a future
release.
checkpoint-create-as
--------------------
**Syntax:**
::
checkpoint-create-as domain [--print-xml] [name]
[description] [--quiesce] [--diskspec] diskspec]...
Create a checkpoint for domain *domain* with the given <name> and
<description>; if either value is omitted, libvirt will choose a
value. If *--print-xml* is specified, then XML appropriate for
*checkpoint-create* is output, rather than actually creating a
checkpoint.
The *--diskspec* option can be used to control which guest disks
participate in the checkpoint. This option can occur multiple times,
according to the number of <disk> elements in the domain xml. Each
<diskspec> is in the form ``disk[,checkpoint=type][,bitmap=name]``. A
literal *--diskspec* must precede each ``diskspec`` unless
all three of *domain*, *name*, and *description* are also present.
For example, a diskspec of "vda,checkpoint=bitmap,bitmap=map1"
results in the following XML:
::
<disk name='vda' checkpoint='bitmap' bitmap='map1'/>
If *--quiesce* is specified, libvirt will try to use guest agent
to freeze and unfreeze domain's mounted file systems. However,
if domain has no guest agent, checkpoint creation will fail.
For now, it is not possible to create checkpoints in a domain that has
snapshots, although this restriction will be lifted in a future
release.
checkpoint-edit
---------------
**Syntax:**
::
checkpoint-edit domain checkpointname
Edit the XML configuration file for *checkpointname* of a domain.
This is equivalent to:
::
virsh checkpoint-dumpxml dom name > checkpoint.xml
vi checkpoint.xml (or make changes with your other text editor)
virsh checkpoint-create dom checkpoint.xml --redefine
except that it does some error checking, including that the edits
should not attempt to change the checkpoint name.
The editor used can be supplied by the ``$VISUAL`` or ``$EDITOR`` environment
variables, and defaults to ``vi``.
checkpoint-info
---------------
**Syntax:**
::
checkpoint-info domain checkpoint
Output basic information about a named <checkpoint>.
checkpoint-list
---------------
**Syntax:**
::
checkpoint-list domain [{--parent | --roots |
[{--tree | --name}]}] [--topological]
[[--from] checkpoint | [--descendants]]
[--leaves] [--no-leaves]
List all of the available checkpoints for the given domain, defaulting
to show columns for the checkpoint name and creation time.
Normally, table form output is sorted by checkpoint name; using
*--topological* instead sorts so that no child is listed before its
ancestors (although there may be more than one possible ordering with
this property).
If *--parent* is specified, add a column to the output table giving
the name of the parent of each checkpoint. If *--roots* is
specified, the list will be filtered to just checkpoints that have no
parents. If *--tree* is specified, the output will be in a tree
format, listing just checkpoint names. These three options are
mutually exclusive. If *--name* is specified only the checkpoint name
is printed. This option is mutually exclusive with *--tree*.
If *--from* is provided, filter the list to checkpoints which are
children of the given ``checkpoint``. When used in isolation or with
*--parent*, the list is limited to direct children unless
*--descendants* is also present. When used with *--tree*, the use
of *--descendants* is implied. This option is not compatible with
*--roots*. Note that the starting point of *--from*
is not included in the list unless the *--tree* option is also
present.
If *--leaves* is specified, the list will be filtered to just
checkpoints that have no children. Likewise, if *--no-leaves* is
specified, the list will be filtered to just checkpoints with
children. (Note that omitting both options does no filtering, while
providing both options will either produce the same list or error out
depending on whether the server recognizes the flags). Filtering
options are not compatible with *--tree*.
checkpoint-dumpxml
------------------
**Syntax:**
::
checkpoint-dumpxml domain checkpoint [--security-info] [--no-domain] [--size]
Output the checkpoint XML for the domain's checkpoint named
*checkpoint*. Using
*--security-info* will also include security sensitive information.
Using *--size* will add XML indicating the current size in bytes of
guest data that has changed since the checkpoint was created (although
remember that guest activity between a size check and actually
creating a backup can result in the backup needing slightly more
space). Using *--no-domain* will omit the <domain> element from the
output for a more compact view.
checkpoint-parent
-----------------
**Syntax:**
::
checkpoint-parent domain checkpoint
Output the name of the parent checkpoint, if any, for the given
*checkpoint*.
checkpoint-delete
-----------------
**Syntax:**
::
checkpoint-delete domain checkpoint
[--metadata] [{--children | --children-only}]
Delete the checkpoint for the domain named *checkpoint*. The
record of which portions of
the disk changed since the checkpoint are merged into the parent
checkpoint (if any). If *--children* is passed, then delete this
checkpoint and any children of this checkpoint. If *--children-only*
is passed, then delete any children of this checkpoint, but leave this
checkpoint intact. These two flags are mutually exclusive.
If *--metadata* is specified, then only delete the checkpoint
metadata maintained by libvirt, while leaving the checkpoint contents
intact for access by external tools; otherwise deleting a checkpoint
also removes the ability to perform an incremental backup from that
point in time.
NWFILTER COMMANDS
=================
The following commands manipulate network filters. Network filters allow
filtering of the network traffic coming from and going to virtual machines.
Individual network traffic filters are written in XML and may contain
references to other network filters, describe traffic filtering rules,
or contain both. Network filters are referenced by virtual machines
from within their interface description. A network filter may be referenced
by multiple virtual machines' interfaces.
nwfilter-define
---------------
**Syntax:**
::
nwfilter-define xmlfile
Make a new network filter known to libvirt. If a network filter with
the same name already exists, it will be replaced with the new XML.
Any running virtual machine referencing this network filter will have
its network traffic rules adapted. If for any reason the network traffic
filtering rules cannot be instantiated by any of the running virtual
machines, then the new XML will be rejected.
nwfilter-undefine
-----------------
**Syntax:**
::
nwfilter-undefine nwfilter-name
Delete a network filter. The deletion will fail if any running virtual
machine is currently using this network filter.
nwfilter-list
-------------
**Syntax:**
::
nwfilter-list
List all of the available network filters.
nwfilter-dumpxml
----------------
**Syntax:**
::
nwfilter-dumpxml nwfilter-name
Output the network filter XML.
nwfilter-edit
-------------
**Syntax:**
::
nwfilter-edit nwfilter-name
Edit the XML of a network filter.
This is equivalent to:
::
virsh nwfilter-dumpxml myfilter > myfilter.xml
vi myfilter.xml (or make changes with your other text editor)
virsh nwfilter-define myfilter.xml
except that it does some error checking.
The new network filter may be rejected due to the same reason as
mentioned in *nwfilter-define*.
The editor used can be supplied by the ``$VISUAL`` or ``$EDITOR`` environment
variables, and defaults to ``vi``.
NWFILTER BINDING COMMANDS
=========================
The following commands manipulate network filter bindings. Network filter
bindings track the association between a network port and a network
filter. Generally the bindings are managed automatically by the hypervisor
drivers when adding/removing NICs on a guest.
If an admin is creating/deleting TAP devices for non-guest usage,
however, the network filter binding commands provide a way to make use
of the network filters directly.
nwfilter-binding-create
-----------------------
**Syntax:**
::
nwfilter-binding-create xmlfile
Associate a network port with a network filter. The network filter backend
will immediately attempt to instantiate the filter rules on the port. This
command may be used to associate a filter with a currently running guest
that does not have a filter defined for a specific network port. Since the
bindings are generally automatically managed by the hypervisor, using this
command to define a filter for a network port and then starting the guest
afterwards may prevent the guest from starting if it attempts to use the
network port and finds a filter already defined.
nwfilter-binding-delete
-----------------------
**Syntax:**
::
nwfilter-binding-delete port-name
Disassociate a network port from a network filter. The network filter
backend will immediately tear down the filter rules that exist on the
port. This command may be used to remove the network port binding for
a filter currently in use for the guest while the guest is running
without needing to restart the guest. Restoring the network port binding
filter for the running guest would be accomplished by using
*nwfilter-binding-create*.
nwfilter-binding-list
---------------------
**Syntax:**
::
nwfilter-binding-list
List all of the network ports which have filters associated with them.
nwfilter-binding-dumpxml
------------------------
**Syntax:**
::
nwfilter-binding-dumpxml port-name
Output the network filter binding XML for the network device called
``port-name``.
HYPERVISOR-SPECIFIC COMMANDS
============================
NOTE: Use of the following commands is ``strongly`` discouraged. They
can cause libvirt to become confused and do the wrong thing on subsequent
operations. Once you have used these commands, please do not report
problems to the libvirt developers; the reports will be ignored. If
you find that these commands are the only way to accomplish something,
then it is better to request that the feature be added as a first-class
citizen in the regular libvirt library.
qemu-attach
-----------
**Syntax:**
::
qemu-attach pid
Attach an externally launched QEMU process to the libvirt QEMU driver.
The QEMU process must have been created with a monitor connection
using the UNIX driver. Ideally the process will also have had the
'-name' argument specified.
::
$ qemu-kvm -cdrom ~/demo.iso \
-monitor unix:/tmp/demo,server,nowait \
-name foo \
-uuid cece4f9f-dff0-575d-0e8e-01fe380f12ea &
$ QEMUPID=$!
$ virsh qemu-attach $QEMUPID
Not all functions of libvirt are expected to work reliably after
attaching to an externally launched QEMU process. There may be
issues with the guest ABI changing upon migration and device hotplug
or hotunplug may not work. The attached environment should be considered
primarily read-only.
qemu-monitor-command
--------------------
**Syntax:**
::
qemu-monitor-command domain { [--hmp] | [--pretty] [--return-value] } command...
Send an arbitrary monitor command *command* to domain *domain* through the
QEMU monitor. The results of the command will be printed on stdout.
If more than one argument is provided for *command*, they are concatenated with
a space in between before passing the single command to the monitor.
Note that libvirt uses the QMP to talk to qemu so *command* must be valid JSON
in QMP format to work properly.
If *--pretty* is given the QMP reply is pretty-printed.
If *--return-value* is given the 'return' key of the QMP response object is
extracted rather than passing through the full reply from QEMU.
If *--hmp* is passed, the command is considered to be a human monitor command
and libvirt will automatically convert it into QMP and convert the result back.
qemu-agent-command
------------------
**Syntax:**
::
qemu-agent-command domain [--timeout seconds | --async | --block] command...
Send an arbitrary guest agent command *command* to domain *domain* through
QEMU agent.
*--timeout*, *--async* and *--block* options are exclusive.
*--timeout* requires timeout seconds *seconds* and it must be positive.
When *--aysnc* is given, the command waits for timeout whether success or
failed. And when *--block* is given, the command waits forever with blocking
timeout.
qemu-monitor-event
------------------
**Syntax:**
::
qemu-monitor-event [domain] [--event event-name]
[--loop] [--timeout seconds] [--pretty] [--regex] [--no-case]
[--timestamp]
Wait for arbitrary QEMU monitor events to occur, and print out the
details of events as they happen. The events can optionally be filtered
by *domain* or *event-name*. The 'query-events' QMP command can be
used via *qemu-monitor-command* to learn what events are supported.
If *--regex* is used, *event-name* is a basic regular expression
instead of a literal string. If *--no-case* is used, *event-name*
will match case-insensitively.
By default, this command is one-shot, and returns success once an event
occurs; you can send SIGINT (usually via ``Ctrl-C``) to quit immediately.
If *--timeout* is specified, the command gives up waiting for events
after *seconds* have elapsed. With *--loop*, the command prints all
events until a timeout or interrupt key. If *--pretty* is specified,
any JSON event details are pretty-printed for better legibility.
When *--timestamp* is used, a human-readable timestamp will be printed
before the event, and the timing information provided by QEMU will be
omitted.
lxc-enter-namespace
-------------------
**Syntax:**
::
lxc-enter-namespace domain [--noseclabel] --
/path/to/binary [arg1, [arg2, ...]]
Enter the namespace of *domain* and execute the command ``/path/to/binary``
passing the requested args. The binary path is relative to the container
root filesystem, not the host root filesystem. The binary will inherit the
environment variables / console visible to virsh. The command will be run
with the same sVirt context and cgroups placement as processes within the
container. This command only works when connected to the LXC hypervisor
driver. This command succeeds only if ``/path/to/binary`` has 0 exit status.
By default the new process will run with the security label of the new
parent container. Use the *--noseclabel* option to instead have the
process keep the same security label as ``virsh``.
ENVIRONMENT
===========
The following environment variables can be set to alter the behaviour
of ``virsh``
- VIRSH_DEBUG=<0 to 4>
Turn on verbose debugging of virsh commands. Valid levels are
* VIRSH_DEBUG=0
DEBUG - Messages at ALL levels get logged
* VIRSH_DEBUG=1
INFO - Logs messages at levels INFO, NOTICE, WARNING and ERROR
* VIRSH_DEBUG=2
NOTICE - Logs messages at levels NOTICE, WARNING and ERROR
* VIRSH_DEBUG=3
WARNING - Logs messages at levels WARNING and ERROR
* VIRSH_DEBUG=4
ERROR - Messages at only ERROR level gets logged.
- VIRSH_LOG_FILE=``LOGFILE``
The file to log virsh debug messages.
- VIRSH_DEFAULT_CONNECT_URI
The hypervisor to connect to by default. Set this to a URI, in the same
format as accepted by the ``connect`` option. This environment variable
is deprecated in favour of the global ``LIBVIRT_DEFAULT_URI`` variable
which serves the same purpose.
- LIBVIRT_DEFAULT_URI
The hypervisor to connect to by default. Set this to a URI, in the
same format as accepted by the ``connect`` option. This overrides
the default URI set in any client config file and prevents libvirt
from probing for drivers.
- VISUAL
The editor to use by the ``edit`` and related options.
- EDITOR
The editor to use by the ``edit`` and related options, if ``VISUAL``
is not set.
- VIRSH_HISTSIZE
The number of commands to remember in the command history. The
default value is 500.
- LIBVIRT_DEBUG=LEVEL
Turn on verbose debugging of all libvirt API calls. Valid levels are
* LIBVIRT_DEBUG=1
Messages at level DEBUG or above
* LIBVIRT_DEBUG=2
Messages at level INFO or above
* LIBVIRT_DEBUG=3
Messages at level WARNING or above
* LIBVIRT_DEBUG=4
Messages at level ERROR
For further information about debugging options consult
`https://libvirt.org/logging.html <https://libvirt.org/logging.html>`_
BUGS
====
Please report all bugs you discover. This should be done via either:
#. the mailing list
`https://libvirt.org/contact.html <https://libvirt.org/contact.html>`_
#. the bug tracker
`https://libvirt.org/bugs.html <https://libvirt.org/bugs.html>`_
Alternatively, you may report bugs to your software distributor / vendor.
AUTHORS
=======
Please refer to the AUTHORS file distributed with libvirt.
COPYRIGHT
=========
Copyright (C) 2005, 2007-2015 Red Hat, Inc., and the authors listed in the
libvirt AUTHORS file.
LICENSE
=======
``virsh`` is distributed under the terms of the GNU LGPL v2+.
This is free software; see the source for copying conditions. There
is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE
SEE ALSO
========
virt-install(1), virt-xml-validate(1), virt-top(1), virt-df(1),
`https://libvirt.org/ <https://libvirt.org/>`_
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