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synced 2024-12-23 06:05:27 +00:00
59d30adacd
After some debugging and discussion with systemd team it turns out we are misusing the ordering in libvirt-guests.service. That happened because we want to support both monolithic and modular daemon setups and on top of that we also want to support socket activation and services without socket activation. Unfortunately this is impossible to express in the unit file because of how transactions are handled in systemd when dependencies are resolved and multiple actions (jobs) are queued. For explanation from Michal Sekletar see comment #7 in the BZ this patch is fixing: https://bugzilla.redhat.com/show_bug.cgi?id=1964855#c7 In order to support all the scenarios this patch also amends the manpages so that users that are changing the default can also read how to correct the dependency ordering in libvirt-guests unit file. Ideally we would also keep the existing configuration during upgrade, but due to our huge support matrix this seems hardly feasible as it could introduce even more problems. Signed-off-by: Martin Kletzander <mkletzan@redhat.com> Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
230 lines
5.5 KiB
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230 lines
5.5 KiB
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=======
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virtvzd
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=======
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-----------------------------------
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libvirt Virtuozzo management daemon
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-----------------------------------
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:Manual section: 8
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:Manual group: Virtualization Support
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.. contents::
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SYNOPSIS
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========
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``virtvzd`` [*OPTION*]...
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DESCRIPTION
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===========
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The ``virtvzd`` program is a server side daemon component of the libvirt
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virtualization management system.
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It is one of a collection of modular daemons that replace functionality
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previously provided by the monolithic ``libvirtd`` daemon.
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This daemon runs on virtualization hosts to provide management for Virtuozzo
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virtual machines.
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The ``virtvzd`` daemon only listens for requests on a local Unix domain
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socket. Remote off-host access and backwards compatibility with legacy
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clients expecting ``libvirtd`` is provided by the ``virtproxy`` daemon.
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Restarting ``virtvzd`` does not interrupt running guests. Guests continue to
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operate and changes in their state will generally be picked up automatically
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during startup. None the less it is recommended to avoid restarting with
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running guests whenever practical.
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SYSTEM SOCKET ACTIVATION
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========================
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The ``virtvzd`` daemon is capable of starting in two modes.
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In the traditional mode, it will create and listen on UNIX sockets itself.
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In socket activation mode, it will rely on systemd to create and listen
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on the UNIX sockets and pass them as pre-opened file descriptors. In this
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mode most of the socket related config options in
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``/etc/libvirt/virtvzd.conf`` will no longer have any effect.
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Socket activation mode is generally the default when running on a host
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OS that uses systemd. To revert to the traditional mode, all the socket
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unit files must be masked:
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::
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$ systemctl mask virtvzd.socket virtvzd-ro.socket \
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virtvzd-admin.socket
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If using libvirt-guests service then the ordering for that service needs to be
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adapted so that it is ordered after the service unit instead of the socket unit.
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Since dependencies and ordering cannot be changed with drop-in overrides, the
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whole libvirt-guests unit file needs to be changed. In order to preserve such
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change copy the installed ``/usr/lib/systemd/system/libvirt-guests.service`` to
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``/etc/systemd/system/libvirt-guests.service`` and make the change there,
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specifically make sure the ``After=`` ordering mentions ``virtvzd.service`` and
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not ``virtvzd.socket``:
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::
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[Unit]
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After=virtvzd.service
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OPTIONS
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=======
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``-h``, ``--help``
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Display command line help usage then exit.
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``-d``, ``--daemon``
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Run as a daemon & write PID file.
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``-f``, ``--config *FILE*``
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Use this configuration file, overriding the default value.
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``-p``, ``--pid-file *FILE*``
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Use this name for the PID file, overriding the default value.
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``-t``, ``--timeout *SECONDS*``
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Exit after timeout period (in seconds), provided there are neither any client
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connections nor any running domains.
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``-v``, ``--verbose``
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Enable output of verbose messages.
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``--version``
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Display version information then exit.
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SIGNALS
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=======
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On receipt of ``SIGHUP`` ``virtvzd`` will reload its configuration.
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FILES
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=====
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When run as *root*
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------------------
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* ``@SYSCONFDIR@/libvirt/virtvzd.conf``
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The default configuration file used by ``virtvzd``, unless overridden on the
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command line using the ``-f`` | ``--config`` option.
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* ``@RUNSTATEDIR@/libvirt/virtvzd-sock``
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* ``@RUNSTATEDIR@/libvirt/virtvzd-sock-ro``
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* ``@RUNSTATEDIR@/libvirt/virtvzd-admin-sock``
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The sockets ``virtvzd`` will use.
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The TLS **Server** private key ``virtvzd`` will use.
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* ``@RUNSTATEDIR@/virtvzd.pid``
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The PID file to use, unless overridden by the ``-p`` | ``--pid-file`` option.
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When run as *non-root*
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----------------------
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* ``$XDG_CONFIG_HOME/libvirt/virtvzd.conf``
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The default configuration file used by ``virtvzd``, unless overridden on the
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command line using the ``-f``|``--config`` option.
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* ``$XDG_RUNTIME_DIR/libvirt/virtvzd-sock``
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* ``$XDG_RUNTIME_DIR/libvirt/virtvzd-admin-sock``
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The sockets ``virtvzd`` will use.
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* ``$XDG_RUNTIME_DIR/libvirt/virtvzd.pid``
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The PID file to use, unless overridden by the ``-p``|``--pid-file`` option.
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If ``$XDG_CONFIG_HOME`` is not set in your environment, ``virtvzd`` will use
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``$HOME/.config``
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If ``$XDG_RUNTIME_DIR`` is not set in your environment, ``virtvzd`` will use
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``$HOME/.cache``
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EXAMPLES
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========
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To retrieve the version of ``virtvzd``:
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::
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# virtvzd --version
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virtvzd (libvirt) @VERSION@
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To start ``virtvzd``, instructing it to daemonize and create a PID file:
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::
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# virtvzd -d
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# ls -la @RUNSTATEDIR@/virtvzd.pid
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-rw-r--r-- 1 root root 6 Jul 9 02:40 @RUNSTATEDIR@/virtvzd.pid
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BUGS
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====
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Please report all bugs you discover. This should be done via either:
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#. the mailing list
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`https://libvirt.org/contact.html <https://libvirt.org/contact.html>`_
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#. the bug tracker
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`https://libvirt.org/bugs.html <https://libvirt.org/bugs.html>`_
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Alternatively, you may report bugs to your software distributor / vendor.
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AUTHORS
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=======
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Please refer to the AUTHORS file distributed with libvirt.
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COPYRIGHT
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=========
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Copyright (C) 2006-2020 Red Hat, Inc., and the authors listed in the
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libvirt AUTHORS file.
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LICENSE
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=======
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``virtvzd`` is distributed under the terms of the GNU LGPL v2.1+.
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This is free software; see the source for copying conditions. There
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is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE
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SEE ALSO
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========
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virsh(1), libvirtd(8),
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`https://www.libvirt.org/daemons.html <https://www.libvirt.org/daemons.html>`_,
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`https://www.libvirt.org/drvvz.html <https://www.libvirt.org/drvvz.html>`_
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