Right now, it is appallingly easy to cause qemu disk snapshots
to alter a domain then fail; for example, by requesting a two-disk
snapshot where the second disk name resides on read-only storage.
In this failure scenario, libvirt reports failure, but modifies
the live domain XML in-place to record that the first disk snapshot
was taken; and places a difficult burden on the management app
to grab the XML and reparse it to see which disks, if any, were
altered by the partial snapshot.
This patch adds a new flag where implementations can request that
the hypervisor make snapshots atomically; either no changes to
XML occur, or all disks were altered as a group. If you request
the flag, you either get outright failure up front, or you take
advantage of hypervisor abilities to make an atomic snapshot. Of
course, drivers should prefer the atomic means even without the
flag explicitly requested.
There's no way to make snapshots 100% bulletproof - even if the
hypervisor does it perfectly atomic, we could run out of memory
during the followup tasks of updating our in-memory XML, and report
a failure. However, these sorts of catastrophic failures are rare
and unlikely, and it is still nicer to know that either all
snapshots happened or none of them, as that is an easier state to
recover from.
* include/libvirt/libvirt.h.in
(VIR_DOMAIN_SNAPSHOT_CREATE_ATOMIC): New flag.
* src/libvirt.c (virDomainSnapshotCreateXML): Document it.
* tools/virsh.c (cmdSnapshotCreate, cmdSnapshotCreateAs): Expose it.
* tools/virsh.pod (snapshot-create, snapshot-create-as): Document
it.
This introduces a new domain state pmsuspended to represent
the domain which has been suspended by guest power management,
e.g. (entered itno s3 state). Because a "running" state could
be confused in this case, one will see the guest is paused
actually while playing. And state "paused" is for the domain
which was paused by virDomainSuspend.
virsh.pod had several instances in which it referred to "the
documentation" which was a little puzzling to me since it is
documentation. Reading the document from end to end makes it clear
that it means a specific URI which was noted previously in the text,
but I had never noticed those URIs in several years of referring to
the man page. This patch adds those URIs to several additional places
in the text.
Currently if the URI passed to virConnectOpen* is NULL, then we
- Look for LIBVIRT_DEFAULT_URI env var
- Probe for drivers
This changes it so that
- Look for LIBVIRT_DEFAULT_URI env var
- Look for 'uri_default' in $HOME/.libvirt/libvirt.conf
- Probe for drivers
Since VIR_DOMAIN_AFFECT_{LIVE,CONFIG,CURRENT} was created,
all new virsh commands use "--config" to represents the
persistent changing. This patch add "--config" option
for the old commands which still use "--persistent",
and "--persistent" is now alias of "--config".
tools/virsh.c: (use "--config", and "--persistent" is
alias of "--config" now).
cmdDomIfSetLink, cmdDomIfGetLink, cmdAttachDevice,
cmdDetachDevice, cmdUpdateDevice, cmdAttachInterface,
cmdDetachInterface, cmdAttachDisk, cmdDetachDisk
toos/virsh.pod: Update docs of the changed commands, and
add some missed docs for "--config" (detach-interface,
detach-disk, and detach-device).
The last vestige of the inaccurate 'kilobytes' when we meant 1024 is
now gone. And virsh is now useful for setting memory in units other
than KiB.
* tools/virsh.c (cmdSetmem, cmdSetmaxmem): Use new helper routine,
allow passing bogus arguments on to hypervisor to test driver
sanity checking, and fix leak on parse error.
(vshMemtuneGetSize): New helper.
(cmdMemtune): Use it.
* tools/virsh.pod (setmem, setmaxmem, memtune): Document this.
Now can now do:
virsh vol-resize $vol 10M
virsh blockresize $dom $vol 10M
to get both interfaces to resize to 10MiB. The remaining wart
is that vol-resize defaults to bytes, but blockresize defaults
to KiB, but we can't break existing scripts; oh well, it's no
worse than the same wart of the underlying virDomainBlockResize.
The API for virStorageVolResize states that capacity must always
be positive, and that the presence of shrink and delta flags is
what implies a negative change.
* tools/virsh.c (vshCommandOptScaledInt): New function.
(cmdVolResize): Don't pass negative size.
(cmdVolSize): Rename...
(vshVolSize): ...and use new helper routine.
(cmdBlockResize): Use new helper routine, and support new bytes
flag.
* tools/virsh.pod (NOTES): Document suffixes.
(blockresize, vol-create-as, vol-resize): Point to notes.
Just because our public API has a typo doesn't mean that virsh
has to keep the typo.
* tools/virsh.c (VSH_CMD_FLAG_ALIAS): New flag.
(nodedevCmds): Use it.
(cmdHelp): Omit alias commands.
(cmdNodeDeviceDettach): Rename...
(cmdNodeDeviceDetach): ...to this.
* tools/virsh.pod (nodedev-detach): Document it.
Command line interfaces should use dash, not underscore, as many
keyboard layouts allow that to be typed with fewer shift key presses.
Also, the US spelling of --tunneled gets more google hits than the
UK spelling of --tunnelled.
* tools/virsh.c (opts_migrate): Allow US variant.
(opts_blkdeviotune): Prefer - over _.
* tools/virsh.pod (blkdeviotune): Fix spelling.
In the past, we have created some virsh options with less-than-stellar
names. For back-compat reasons, those names must continue to parse,
but we don't want to document them in help output. This introduces
a new option type, an alias, which points to a canonical option name
later in the option list.
I'm actually quite impressed that our code has already been factored
to do all option parsing through common entry points, such that I
got this added in relatively few lines of code!
* tools/virsh.c (VSH_OT_ALIAS): New option type.
(opts_echo): Hook up an alias, for easy testing.
(vshCmddefOptParse, vshCmddefHelp, vshCmddefGetOption): Allow for
aliases.
* tools/virsh.pod (NOTES): Document promise of back-compat.
* tests/virshtest.c (mymain): Test new feature.
Now virsh can call virDomainBlockRebase.
* tools/virsh.c (cmdBlockPull): Add --base parameter.
(blockJobImpl): Use it to expose BlockRebase API.
* tools/virsh.pod (blockpull): Document it.
The current scrub version doesn't support pfitzner7, pfitzner33 and schneier
patterns on RHEL, we should comment it in virsh man page.
* tools/virsh.pod: update wiping algorithms docs.
Signed-off-by: Alex Jia <ajia@redhat.com>
This patch adds support for the newly introduced
VIR_DOMAIN_CONSOLE_FORCE and VIR_DOMAIN_CONSOLE_SAFE flags. The console
command now has an optional parameter --force that specifies that the
user wants to forcibly interrupt an ongoing console session and create
a new one. Flag --safe requests that the console should be opened only
if the hypervisor driver supports safe console handling.
The behaviour to this point was that the daemon opened two streams to
the console, that competed for data from the pipe, and the result was
that both of the consoles ended up scrambled.
This patch doesn't modify operation of other commands dealing with
console connections (start, create) as those open connections to newly
started domains making it virtually impossible for another client to race
for the console and steal it.
* tools/console.c:
- add support for flag passthrough
* tools/console.h:
- modify function prototypes to match impl.
* tools/virsh.c:
- add flag --force for the console command
This patch adds new options to the "virsh list" command enabling
filtering of persistent and transient domains along with the option to
print only UUIDs or names of domains instead of printing the table.
Option --name prints domain names (one per line) instead of the default
table. Similarly --uuid prints domain's UUID. The option --table is
an alias for the default behavior.
Aditionally --persistent and/or --transient may be specified to filter
the output of domains.
Commit fad5cd2108 introduced option to
display domain's title in the list command output. There was a mistake
in the virsh man page example for this command stating --note instead of
--title.
When blkdeviotune was first committed in 0.9.8, we had the limitation
that setting one value reset all others. But bytes and iops should
be relatively independent. Furthermore, setting tuning values on
a live domain followed by dumpxml did not output the new settings.
* src/qemu/qemu_driver.c (qemuDiskPathToAlias): Add parameter, and
update callers.
(qemuDomainSetBlockIoTune): Don't lose previous unrelated
settings. Make live changes reflect to dumpxml output.
* tools/virsh.pod (blkdeviotune): Update documentation.
This patch adds a new command "desc" to show and modify titles and
description for the domains using the new API.
This patch also adds a new flag for the "list" command to show titles in
the domain list, to allow easy identification of VMs by storing a short
description.
Example:
virsh # list --title
Id Name State Title
-----------------------------------------------
0 Domain-0 running Mailserver 1
2 fedora paused
Add a new function to allow changing of capacity of storage volumes.
Plan out several flags, even if not all of them will be implemented
up front.
Expose the new command via 'virsh vol-resize'.
Signed-off-by: Eric Blake <eblake@redhat.com>
Currently, we support only filling a volume with zeroes on wiping.
However, it is not enough as data might still be readable by
experienced and equipped attacker. Many technical papers have been
written, therefore we should support other wiping algorithms.
Extend the 'shutdown' and 'reboot' methods so that they both
accept a new argument
--mode acpi|agent
* tools/virsh.c: New args for shutdown/reboot
* tools/virsh.pod: Document new args
Other virsh domifXXX commands can accept target name
as a parameter to specify interface. From viewpoint of
consistency, virsh domif-getlink command should accept
target name as a parameter. This patch achieves this.
Signed-off-by: Taku Izumi <izumi.taku@jp.fujitsu.com>
Disk "type" and "device" are generally interesting stuff the
user may want to known, too. To not break any scripts which
parsed the output field, a new option "--details" is introduced
to output the two introduced fields.
Just like command "domblklist", the command extracts "type",
"source", "target", "model", and "MAC" of all virtual interfaces
from domain XML (live or persistent).
When disk snapshots were first implemented, libvirt blindly refused
to allow an external snapshot destination that already exists, since
qemu will blindly overwrite the contents of that file during the
snapshot_blkdev monitor command, and we don't like a default of
data loss by default. But VDSM has a scenario where NFS permissions
are intentionally set so that the destination file can only be
created by the management machine, and not the machine where the
guest is running, so that libvirt will necessarily see the destination
file already existing; adding a flag will allow VDSM to force the file
reuse without libvirt complaining of possible data loss.
https://bugzilla.redhat.com/show_bug.cgi?id=767104
* include/libvirt/libvirt.h.in (virDomainSnapshotCreateFlags): Add
VIR_DOMAIN_SNAPSHOT_CREATE_REUSE_EXT.
* src/libvirt.c (virDomainSnapshotCreateXML): Document it. Add
note about partial failure.
* tools/virsh.c (cmdSnapshotCreate, cmdSnapshotCreateAs): Add new
flag.
* tools/virsh.pod (snapshot-create, snapshot-create-as): Document
it.
* src/qemu/qemu_driver.c (qemuDomainSnapshotDiskPrepare)
(qemuDomainSnapshotCreateXML): Implement the new flag.
Add a new command domiftune to get/set interface parameters.
* tools/virsh.c: implement the new command
* tools/virsh.pod: documentation of the new command
Virsh's echo command looks not having any relations with domains and its
description should go into the generic commands section instead of the
domain commands section (current).
Virsh's send-key command manipulates domains and its description should
go into the domain commands section instead of generic commands section
(current).
Add an option for virsh undefine command, to remove associated storage
volumes while undefining a domain. This patch allows the user to remove
associated (libvirt managed ) storage volumes while undefining a domain.
The new option --storage for the undefine command takes a string
argument that consists of comma separated list of target or source path
of volumes to be undefined. Volumes are removed after the domain has
been successfully undefined,
If a volume is not part of a storage pool, the user is warned to remove
the volume in question himself.
Option --wipe-storage may be specified along with this, that ensures
the image is wiped before removing.
Option --remove-all-storage enables the user to remove all storage. The
name is chosen long as the users should be aware what they're about to
do.
I was wondering why 'virsh edit' didn't support the same
'--inactive' option as 'virsh dumpxml'; reading the source
code showed that --inactive was already implied, and that
the only way to alter a running guest rather than affecting
next boot is by hot-plugging individual devices, or by
something complex like saving the guest and modifying the
save image.
* tools/virsh.pod (define, edit): Mention behavior when guest is
already running.
