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<?xml version='1.0'?> <!--*-nxml-*-->
<?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
-->
<refentry id="systemd.snapshot">
<refentryinfo>
<title>systemd.snapshot</title>
<productname>systemd</productname>
<authorgroup>
<author>
<contrib>Developer</contrib>
<firstname>Lennart</firstname>
<surname>Poettering</surname>
<email>lennart@poettering.net</email>
</author>
</authorgroup>
</refentryinfo>
<refmeta>
<refentrytitle>systemd.snapshot</refentrytitle>
<manvolnum>5</manvolnum>
</refmeta>
<refnamediv>
<refname>systemd.snapshot</refname>
<refpurpose>Snapshot unit configuration</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename><replaceable>snapshot</replaceable>.snapshot</filename></para>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>Snapshot units are not configured via unit
configuration files. Nonetheless they are named
similar to filenames. A unit name whose name ends in
<filename>.snapshot</filename> refers to a dynamic
snapshot of the systemd runtime state.</para>
<para>Snapshots are not configured on disk but created
dynamically via <command>systemctl snapshot</command>
(see
<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>
for details) or an equivalent command. When created,
they will automatically get dependencies on the
currently activated units. They act as saved
runtime state of the systemd manager. Later on, the
user may choose to return to the saved state via
<command>systemctl isolate</command>. They are
useful to roll back to a defined state after
temporarily starting/stopping services or
similar.</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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