man/systemd.target.xml

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  23
  24 <refentry id="systemd.target">
  25   <refentryinfo>
  26     <title>systemd.target</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.target</refentrytitle>
  41     <manvolnum>5</manvolnum>
  42   </refmeta>
  43
  44   <refnamediv>
  45     <refname>systemd.target</refname>
  46     <refpurpose>Target unit configuration</refpurpose>
  47   </refnamediv>
  48
  49   <refsynopsisdiv>
  50     <para><filename><replaceable>target</replaceable>.target</filename></para>
  51   </refsynopsisdiv>
  52
  53   <refsect1>
  54     <title>Description</title>
  55
  56     <para>A unit configuration file whose name ends in
  57     <literal>.target</literal> encodes information about a target unit
  58     of systemd, which is used for grouping units and as well-known
  59     synchronization points during start-up.</para>
  60
  61     <para>This unit type has no specific options. See
  62     <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
  63     for the common options of all unit configuration files. The common
  64     configuration items are configured in the generic [Unit] and
  65     [Install] sections. A separate [Target] section does not exist,
  66     since no target-specific options may be configured.</para>
  67
  68     <para>Target units do not offer any additional functionality on
  69     top of the generic functionality provided by units. They exist
  70     merely to group units via dependencies (useful as boot targets),
  71     and to establish standardized names for synchronization points
  72     used in dependencies between units. Among other things, target
  73     units are a more flexible replacement for SysV runlevels in the
  74     classic SysV init system. (And for compatibility reasons special
  75     target units such as <filename>runlevel3.target</filename> exist
  76     which are used by the SysV runlevel compatibility code in systemd.
  77     See
  78     <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>
  79     for details).</para>
  80   </refsect1>
  81
  82   <refsect1>
  83     <title>Automatic Dependencies</title>
  84
  85     <para>Unless <varname>DefaultDependencies=</varname> is set to
  86     <option>no</option> in either of releated units or an explicit ordering
  87     dependency is already defined, target units will implicitly complement all
  88     configured dependencies of type <varname>Wants=</varname> or
  89     <varname>Requires=</varname> with dependencies of type
  90     <varname>After=</varname>. Note that <varname>Wants=</varname> or
  91     <varname>Requires=</varname> must be defined in the target unit itself — if
  92     you for example define <varname>Wants=</varname>some.target in
  93     some.service, the implicit ordering will not be added.</para>
  94
  95     <para>All target units automatically gain <varname>Conflicts=</varname>
  96     dependency against shutdown.target unless <varname>DefaultDependencies=</varname>
  97     is set to <option>no</option>.</para>
  98
  99   </refsect1>
 100
 101   <refsect1>
 102       <title>See Also</title>
 103       <para>
 104         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 105         <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 106         <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 107         <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
 108         <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
 109       </para>
 110   </refsect1>
 111
 112 </refentry>