man/systemd.target.xml

   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"
   4         "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
   5
   6 <!--
   7   This file is part of systemd.
   8
   9   Copyright 2010 Lennart Poettering
  10
  11   systemd is free software; you can redistribute it and/or modify it
  12   under the terms of the GNU Lesser General Public License as published by
  13   the Free Software Foundation; either version 2.1 of the License, or
  14   (at your option) any later version.
  15
  16   systemd is distributed in the hope that it will be useful, but
  17   WITHOUT ANY WARRANTY; without even the implied warranty of
  18   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19   Lesser General Public License for more details.
  20
  21   You should have received a copy of the GNU Lesser General Public License
  22   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  23 -->
  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>systemd.target</filename></para>
  52         </refsynopsisdiv>
  53
  54         <refsect1>
  55                 <title>Description</title>
  56
  57                 <para>A unit configuration file whose name ends in
  58                 <filename>.target</filename> encodes information about
  59                 a target unit of systemd, which is used for grouping
  60                 units and as well-known synchronization points during
  61                 start-up.</para>
  62
  63                 <para>This unit type has no specific options. See
  64                 <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
  65                 for the common options of all unit configuration
  66                 files. The common configuration items are configured
  67                 in the generic [Unit] and [Install] sections. A
  68                 separate [Target] section does not exist, since no
  69                 target-specific options may be configured.</para>
  70
  71                 <para>Target units do not offer any additional
  72                 functionality on top of the generic functionality
  73                 provided by units. They exist merely to group units via dependencies
  74                 (useful as boot targets), and to establish
  75                 standardized names for synchronization points used in
  76                 dependencies between units. Among other things, target
  77                 units are a more flexible replacement for SysV
  78                 runlevels in the classic SysV init system. (And for
  79                 compatibility reasons special
  80                 target units such as
  81                 <filename>runlevel3.target</filename> exist which are used by
  82                 the SysV runlevel compatibility code in systemd. See
  83                 <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>
  84                 for details).</para>
  85
  86                 <para>Unless <varname>DefaultDependencies=</varname>
  87                 is set to <option>false</option>, target units will
  88                 implicitly complement all configured dependencies of
  89                 type <varname>Wants=</varname>,
  90                 <varname>Requires=</varname>,
  91                 <varname>RequiresOverridable=</varname> with
  92                 dependencies of type <varname>After=</varname> if the
  93                 units in question also have
  94                 <varname>DefaultDependencies=true</varname>.
  95                 </para>
  96         </refsect1>
  97
  98         <refsect1>
  99                   <title>See Also</title>
 100                   <para>
 101                           <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 102                           <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 103                           <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 104                           <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>
 105                   </para>
 106         </refsect1>
 107
 108 </refentry>