man/systemd.target.xml

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  11   Copyright 2010 Lennart Poettering
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  26
  27 <refentry id="systemd.target">
  28   <refentryinfo>
  29     <title>systemd.target</title>
  30     <productname>systemd</productname>
  31
  32     <authorgroup>
  33       <author>
  34         <contrib>Developer</contrib>
  35         <firstname>Lennart</firstname>
  36         <surname>Poettering</surname>
  37         <email>lennart@poettering.net</email>
  38       </author>
  39     </authorgroup>
  40   </refentryinfo>
  41
  42   <refmeta>
  43     <refentrytitle>systemd.target</refentrytitle>
  44     <manvolnum>5</manvolnum>
  45   </refmeta>
  46
  47   <refnamediv>
  48     <refname>systemd.target</refname>
  49     <refpurpose>Target unit configuration</refpurpose>
  50   </refnamediv>
  51
  52   <refsynopsisdiv>
  53     <para><filename><replaceable>target</replaceable>.target</filename></para>
  54   </refsynopsisdiv>
  55
  56   <refsect1>
  57     <title>Description</title>
  58
  59     <para>A unit configuration file whose name ends in
  60     <literal>.target</literal> encodes information about a target unit
  61     of systemd, which is used for grouping units and as well-known
  62     synchronization points during start-up.</para>
  63
  64     <para>This unit type has no specific options. See
  65     <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
  66     for the common options of all unit configuration files. The common
  67     configuration items are configured in the generic [Unit] and
  68     [Install] sections. A separate [Target] section does not exist,
  69     since no target-specific options may be configured.</para>
  70
  71     <para>Target units do not offer any additional functionality on
  72     top of the generic functionality provided by units. They exist
  73     merely to group units via dependencies (useful as boot targets),
  74     and to establish standardized names for synchronization points
  75     used in dependencies between units. Among other things, target
  76     units are a more flexible replacement for SysV runlevels in the
  77     classic SysV init system. (And for compatibility reasons special
  78     target units such as <filename>runlevel3.target</filename> exist
  79     which are used by the SysV runlevel compatibility code in systemd.
  80     See
  81     <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>
  82     for details).</para>
  83
  84     <para>Unless <varname>DefaultDependencies=</varname> is set to
  85     <option>false</option>, target units will implicitly complement
  86     all configured dependencies of type <varname>Wants=</varname>,
  87     <varname>Requires=</varname>,
  88     <varname>RequiresOverridable=</varname> with dependencies of type
  89     <varname>After=</varname> if the units in question also have
  90     <varname>DefaultDependencies=true</varname>.
  91     </para>
  92   </refsect1>
  93
  94   <refsect1>
  95       <title>See Also</title>
  96       <para>
  97         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
  98         <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
  99         <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 100         <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
 101         <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
 102       </para>
 103   </refsect1>
 104
 105 </refentry>