systemd/man/systemd.snapshot.xml

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2010-07-02 09:51:29 +08:00
<?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"
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Copyright 2010 Lennart Poettering
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<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>systemd snapshot units</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename>systemd.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 hence 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 hence
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>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>