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1 <?xml version='1.0'?> <!--*-nxml-*-->
2 <?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
3 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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5
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9   Copyright 2010 Lennart Poettering
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24
25 <refentry id="systemd.snapshot">
26         <refentryinfo>
27                 <title>systemd.snapshot</title>
28                 <productname>systemd</productname>
29
30                 <authorgroup>
31                         <author>
32                                 <contrib>Developer</contrib>
33                                 <firstname>Lennart</firstname>
34                                 <surname>Poettering</surname>
35                                 <email>lennart@poettering.net</email>
36                         </author>
37                 </authorgroup>
38         </refentryinfo>
39
40         <refmeta>
41                 <refentrytitle>systemd.snapshot</refentrytitle>
42                 <manvolnum>5</manvolnum>
43         </refmeta>
44
45         <refnamediv>
46                 <refname>systemd.snapshot</refname>
47                 <refpurpose>Snapshot unit configuration</refpurpose>
48         </refnamediv>
49
50         <refsynopsisdiv>
51                 <para><filename><replaceable>snapshot</replaceable>.snapshot</filename></para>
52         </refsynopsisdiv>
53
54         <refsect1>
55                 <title>Description</title>
56
57                 <para>Snapshot units are not configured via unit
58                 configuration files. Nonetheless they are named
59                 similar to filenames. A unit whose name ends in
60                 <literal>.snapshot</literal> refers to a dynamic
61                 snapshot of the systemd runtime state.</para>
62
63                 <para>Snapshots are not configured on disk but created
64                 dynamically via <command>systemctl snapshot</command>
65                 (see
66                 <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>
67                 for details) or an equivalent command. When created,
68                 they will automatically get dependencies on the
69                 currently activated units. They act as saved
70                 runtime state of the systemd manager. Later on, the
71                 user may choose to return to the saved state via
72                 <command>systemctl isolate</command>. They are
73                 useful to roll back to a defined state after
74                 temporarily starting/stopping services or
75                 similar.</para>
76         </refsect1>
77
78         <refsect1>
79                   <title>See Also</title>
80                   <para>
81                           <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
82                           <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
83                           <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
84                           <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
85                   </para>
86         </refsect1>
87
88 </refentry>