man/systemd.slice.xml

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   9 Copyright 2013 Zbigniew Jędrzejewski-Szmek
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  24
  25 <refentry id="systemd.slice">
  26   <refentryinfo>
  27     <title>systemd.slice</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.slice</refentrytitle>
  42     <manvolnum>5</manvolnum>
  43   </refmeta>
  44
  45   <refnamediv>
  46     <refname>systemd.slice</refname>
  47     <refpurpose>Slice unit configuration</refpurpose>
  48   </refnamediv>
  49
  50   <refsynopsisdiv>
  51     <para><filename><replaceable>slice</replaceable>.slice</filename></para>
  52   </refsynopsisdiv>
  53
  54   <refsect1>
  55     <title>Description</title>
  56
  57     <para>A unit configuration file whose name ends in
  58     <literal>.slice</literal> encodes information about a slice which
  59     is a concept for hierarchially managing resources of a group of
  60     processes. This management is performed by creating a node in the
  61     Linux Control Group (cgroup) tree. Units that manage processes
  62     (primarilly scope and service units) may be assigned to a specific
  63     slice. For each slice, certain resource limits may the be set that
  64     apply to all processes of all units contained in that
  65     slice. Slices are organized hierarchially in a tree. The name of
  66     the slice encodes the location in the tree. The name consists of a
  67     dash-separated series of names, which describes the path to the
  68     slice from the root slice. The root slice is named,
  69     <filename>-.slice</filename>. Example:
  70     <filename>foo-bar.slice</filename> is a slice that is located
  71     within <filename>foo.slice</filename>, which in turn is located in
  72     the root slice <filename>-.slice</filename>.
  73     </para>
  74
  75     <para>By default, service and scope units are placed in
  76     <filename>system.slice</filename>, virtual machines and containers
  77     registered with
  78     <citerefentry><refentrytitle>systemd-machined</refentrytitle><manvolnum>1</manvolnum></citerefentry>
  79     are found in <filename>machine.slice</filename>, and user sessions
  80     handled by
  81     <citerefentry><refentrytitle>systemd-logind</refentrytitle><manvolnum>1</manvolnum></citerefentry>
  82     in <filename>user.slice</filename>. See
  83     <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>5</manvolnum></citerefentry>
  84     for more information.</para>
  85
  86     <para>See
  87     <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
  88     for the common options of all unit configuration
  89     files. The common configuration items are configured
  90     in the generic [Unit] and [Install] sections. The
  91     slice specific configuration options are configured in
  92     the [Slice] section. Currently, only generic resource control settings
  93     as described in
  94     <citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>7</manvolnum></citerefentry> are allowed.
  95     </para>
  96
  97     <para>Unless <varname>DefaultDependencies=false</varname>
  98     is used, slice units will implicitly have dependencies of
  99     type <varname>Conflicts=</varname> and
 100     <varname>Before=</varname> on
 101     <filename>shutdown.target</filename>. These ensure
 102     that slice units are removed prior to system
 103     shutdown. Only slice units involved with early boot or
 104     late system shutdown should disable this option.
 105     </para>
 106   </refsect1>
 107
 108   <refsect1>
 109     <title>See Also</title>
 110     <para>
 111       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 112       <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 113       <citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 114       <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 115       <citerefentry><refentrytitle>systemd.scope</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 116       <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
 117       <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
 118     </para>
 119   </refsect1>
 120
 121 </refentry>