man/systemd.snapshot.xml

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   8   Copyright 2010 Lennart Poettering
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  23
  24 <refentry id="systemd.snapshot">
  25   <refentryinfo>
  26     <title>systemd.snapshot</title>
  27     <productname>systemd</productname>
  28
  29     <authorgroup>
  30       <author>
  31         <contrib>Developer</contrib>
  32         <firstname>Lennart</firstname>
  33         <surname>Poettering</surname>
  34         <email>lennart@poettering.net</email>
  35       </author>
  36     </authorgroup>
  37   </refentryinfo>
  38
  39   <refmeta>
  40     <refentrytitle>systemd.snapshot</refentrytitle>
  41     <manvolnum>5</manvolnum>
  42   </refmeta>
  43
  44   <refnamediv>
  45     <refname>systemd.snapshot</refname>
  46     <refpurpose>Snapshot unit configuration</refpurpose>
  47   </refnamediv>
  48
  49   <refsynopsisdiv>
  50     <para><filename><replaceable>snapshot</replaceable>.snapshot</filename></para>
  51   </refsynopsisdiv>
  52
  53   <refsect1>
  54     <title>Description</title>
  55
  56     <para>Snapshot units are not configured via unit configuration
  57     files. Nonetheless they are named similar to filenames. A unit
  58     whose name ends in <literal>.snapshot</literal> refers to a
  59     dynamic snapshot of the systemd runtime state.</para>
  60
  61     <para>Snapshots are not configured on disk but created dynamically
  62     via <command>systemctl snapshot</command> (see
  63     <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
  64     for details) or an equivalent command. When created, they will
  65     automatically get dependencies on the currently activated units.
  66     They act as saved runtime state of the systemd manager. Later on,
  67     the user may choose to return to the saved state via
  68     <command>systemctl isolate</command>. They are useful to roll back
  69     to a defined state after temporarily starting/stopping services or
  70     similar.</para>
  71   </refsect1>
  72
  73   <refsect1>
  74       <title>See Also</title>
  75       <para>
  76         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
  77         <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
  78         <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
  79         <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
  80       </para>
  81   </refsect1>
  82
  83 </refentry>