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docs: Document qemu.conf locations

Browse Source 
Surprisingly, we never documented the relationship between
connection URI and the location of qemu.conf. Users might wonder
what qemu.conf is loaded when they are connecting to the session
daemon or embed URI. And what to do if the file doesn't exist for
the URI they're using.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
This commit is contained in:
Michal Privoznik 2021-03-04 20:32:29 +01:00
parent 2a490ce5a0
commit bfbed3c718
3 changed files with 81 additions and 0 deletions
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39
docs/drvqemu.html.in
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@ -162,6 +162,45 @@ qemu+ssh://root@example.com/system (remote access, SSH tunnelled)
of libvirt, once QMP processing moves to a dedicated thread.
</p>
<h2><a id="configFiles">Location of configuration files</a></h2>
<p>
The QEMU driver comes with sane default values. However, during its
initialization it reads a configuration file which offers system
administrator or an user to override some of that default. The location
of the file depends on the connection URI, as follows:
</p>
<table>
<tr>
<td><code>qemu:///system</code></td>
<td><code>/etc/libvirt/qemu.conf</code></td>
</tr>
<tr>
<td><code>qemu:///session</code></td>
<td><code>$XDG_CONFIG_HOME/libvirt/qemu.conf</code></td>
</tr>
<tr>
<td><code>qemu:///embed</code></td>
<td><code>$rootdir/etc/qemu.conf</code></td>
</tr>
</table>
<p>
If <code>$XDG_CONFIG_HOME</code> is not set in the environment, it
defaults to <code>$HOME/.config</code>. For the embed URI the
<code>$rootdir</code> represents the specified root directory from
the connection URI.
</p>
<p>
Please note, that it is very likely that the only qemu.conf file that
will exist after installing libvirt is the
<code>/etc/libvirt/qemu.conf</code>, if users of the session daemon or
the embed driver want to override a built in value, then they need to
create the file before connecting to the respective URI.
</p>
<h2><a id="security">Driver security architecture</a></h2>
<p>

20
docs/manpages/libvirtd.rst
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@ -136,6 +136,16 @@ When run as *root*
The default configuration file used by ``libvirtd``, unless overridden on the
command line using the ``-f`` | ``--config`` option.
If QEMU driver is installed, then the following file is also read:
* ``@SYSCONFDIR@/libvirt/qemu.conf``
This file contains various knobs and default values for virtual machines
created within QEMU driver, and offers a way to override the built in defaults,
for instance (but not limited to): paths to various supplementary binaries, TLS
certificates location, graphical consoles configuration and others. Location of
this file can't be overridden by any command line switch.
* ``@RUNSTATEDIR@/libvirt/libvirt-sock``
* ``@RUNSTATEDIR@/libvirt/libvirt-sock-ro``
@ -166,6 +176,16 @@ When run as *non-root*
The default configuration file used by ``libvirtd``, unless overridden on the
command line using the ``-f``|``--config`` option.
If QEMU driver is installed, then the following file is also read:
* ``$XDG_CONFIG_HOME/libvirt/qemu.conf``
If the file exists, it can contain various knobs and default values for virtual
machines created within QEMU driver, and offers a way to override the built in
defaults, for instance (but not limited to): paths to various supplementary
binaries, TLS certificates location, graphical consoles configuration and
others. Location of this file can't be overridden by any command line switch.
* ``$XDG_RUNTIME_DIR/libvirt/libvirt-sock``
The socket ``libvirtd`` will use.

22
docs/manpages/virtqemud.rst
View File

@ -111,6 +111,17 @@ When run as *root*
The default configuration file used by ``virtqemud``, unless overridden on the
command line using the ``-f`` | ``--config`` option.
In addition to the default configuration file, ``virtqemud`` reads
configuration for the qemu driver from:
* ``@SYSCONFDIR@/libvirt/qemu.conf``
This file contains various knobs and default values for virtual machines
created within QEMU driver, and offers a way to override the built in defaults,
for instance (but not limited to): paths to various supplementary binaries, TLS
certificates location, graphical consoles configuration and others. Location of
this file can't be overridden by any command line switch.
* ``@RUNSTATEDIR@/libvirt/virtqemud-sock``
* ``@RUNSTATEDIR@/libvirt/virtqemud-sock-ro``
* ``@RUNSTATEDIR@/libvirt/virtqemud-admin-sock``
@ -132,6 +143,17 @@ When run as *non-root*
The default configuration file used by ``virtqemud``, unless overridden on the
command line using the ``-f``|``--config`` option.
In addition to the default configuration file, ``virtqemud`` reads
configuration for the qemu driver from:
* ``$XDG_CONFIG_HOME/libvirt/qemu.conf``
If the file exists, it can contain various knobs and default values for virtual
machines created within QEMU driver, and offers a way to override the built in
defaults, for instance (but not limited to): paths to various supplementary
binaries, TLS certificates location, graphical consoles configuration and
others. Location of this file can't be overridden by any command line switch.
* ``$XDG_RUNTIME_DIR/libvirt/virtqemud-sock``
* ``$XDG_RUNTIME_DIR/libvirt/virtqemud-admin-sock``