man/systemd.target.xml

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   9   Copyright 2010 Lennart Poettering
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  24
  25 <refentry id="systemd.target">
  26   <refentryinfo>
  27     <title>systemd.target</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.target</refentrytitle>
  42     <manvolnum>5</manvolnum>
  43   </refmeta>
  44
  45   <refnamediv>
  46     <refname>systemd.target</refname>
  47     <refpurpose>Target unit configuration</refpurpose>
  48   </refnamediv>
  49
  50   <refsynopsisdiv>
  51     <para><filename><replaceable>target</replaceable>.target</filename></para>
  52   </refsynopsisdiv>
  53
  54   <refsect1>
  55     <title>Description</title>
  56
  57     <para>A unit configuration file whose name ends in
  58     <literal>.target</literal> encodes information about a target unit
  59     of systemd, which is used for grouping units and as well-known
  60     synchronization points during start-up.</para>
  61
  62     <para>This unit type has no specific options. See
  63     <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
  64     for the common options of all unit configuration files. The common
  65     configuration items are configured in the generic [Unit] and
  66     [Install] sections. A separate [Target] section does not exist,
  67     since no target-specific options may be configured.</para>
  68
  69     <para>Target units do not offer any additional functionality on
  70     top of the generic functionality provided by units. They exist
  71     merely to group units via dependencies (useful as boot targets),
  72     and to establish standardized names for synchronization points
  73     used in dependencies between units. Among other things, target
  74     units are a more flexible replacement for SysV runlevels in the
  75     classic SysV init system. (And for compatibility reasons special
  76     target units such as <filename>runlevel3.target</filename> exist
  77     which are used by the SysV runlevel compatibility code in systemd.
  78     See
  79     <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>
  80     for details).</para>
  81
  82     <para>Unless <varname>DefaultDependencies=</varname> is set to
  83     <option>false</option>, target units will implicitly complement
  84     all configured dependencies of type <varname>Wants=</varname>,
  85     <varname>Requires=</varname>,
  86     <varname>RequiresOverridable=</varname> with dependencies of type
  87     <varname>After=</varname> if the units in question also have
  88     <varname>DefaultDependencies=true</varname>.
  89     </para>
  90   </refsect1>
  91
  92   <refsect1>
  93       <title>See Also</title>
  94       <para>
  95         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
  96         <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
  97         <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
  98         <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
  99         <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
 100       </para>
 101   </refsect1>
 102
 103 </refentry>