mirror of https://gitee.com/openkylin/libvirt.git
178 lines
3.8 KiB
ReStructuredText
178 lines
3.8 KiB
ReStructuredText
=========
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virtlockd
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=========
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------------------------------
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libvirt lock 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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``virtlockd`` [*OPTION*]...
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DESCRIPTION
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===========
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The ``virtlockd`` program is a server side daemon component of the libvirt
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virtualization management system that is used to manage locks held against
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virtual machine resources, such as their disks.
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This daemon is not used directly by libvirt client applications, rather it
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is called on their behalf by ``libvirtd``. By maintaining the locks in a
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standalone daemon, the main libvirtd daemon can be restarted without risk
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of losing locks. The ``virtlockd`` daemon has the ability to re-exec()
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itself upon receiving SIGUSR1, to allow live upgrades without downtime.
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The ``virtlockd`` daemon listens for requests on a local Unix domain socket.
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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 and 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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``-t``, ``--timeout`` *SECONDS*
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Automatically shutdown after *SECONDS* have elapsed with
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no active client or lock.
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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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``-v``, ``--verbose``
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Enable output of verbose messages.
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``-V``, ``--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 ``SIGUSR1``, ``virtlockd`` will re-exec() its binary, while
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maintaining all current locks and clients. This allows for live
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upgrades of the ``virtlockd`` service.
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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/virtlockd.conf``
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The default configuration file used by ``virtlockd``, unless overridden on the
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command line using the ``-f`` | ``--config`` option.
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* ``RUNSTATEDIR/libvirt/virtlockd-sock``
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The sockets ``virtlockd`` will use.
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* ``RUNSTATEDIR/virtlockd.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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* ``$XDG_CONFIG_HOME/libvirt/virtlockd.conf``
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The default configuration file used by ``virtlockd``, unless overridden on the
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command line using the ``-f`` | ``--config`` option.
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* ``$XDG_RUNTIME_DIR/libvirt/virtlockd-sock``
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The socket ``virtlockd`` will use.
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* ``$XDG_RUNTIME_DIR/libvirt/virtlockd.pid``
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The PID file to use, unless overridden by the ``-p`` | ``--pid-file`` option.
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If ``$XDG_CONFIG_HOME`` is not set in your environment, ``virtlockd`` will use
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``$HOME/.config``
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If ``$XDG_RUNTIME_DIR`` is not set in your environment, ``virtlockd`` 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 ``virtlockd``:
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.. code-block::
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# virtlockd --version
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virtlockd (libvirt) 1.1.1
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To start ``virtlockd``, instructing it to daemonize and create a PID file:
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.. code-block::
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# virtlockd -d
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# ls -la RUNSTATEDIR/virtlockd.pid
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-rw-r--r-- 1 root root 6 Jul 9 02:40 RUNSTATEDIR/virtlockd.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) 2006-2013 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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``virtlockd`` 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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libvirtd(8), `https://libvirt.org/ <https://libvirt.org/>`_
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