man/sysctl.d.xml

   1 <?xml version="1.0"?>
   2 <!--*-nxml-*-->
   3 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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   7   Copyright 2011 Lennart Poettering
   8
   9   systemd is free software; you can redistribute it and/or modify it
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  22 <refentry id="sysctl.d">
  23
  24         <refentryinfo>
  25                 <title>sysctl.d</title>
  26                 <productname>systemd</productname>
  27
  28                 <authorgroup>
  29                         <author>
  30                                 <contrib>Developer</contrib>
  31                                 <firstname>Lennart</firstname>
  32                                 <surname>Poettering</surname>
  33                                 <email>lennart@poettering.net</email>
  34                         </author>
  35                 </authorgroup>
  36         </refentryinfo>
  37
  38         <refmeta>
  39                 <refentrytitle>sysctl.d</refentrytitle>
  40                 <manvolnum>5</manvolnum>
  41         </refmeta>
  42
  43         <refnamediv>
  44                 <refname>sysctl.d</refname>
  45                 <refpurpose>Configure kernel parameters at boot</refpurpose>
  46         </refnamediv>
  47
  48         <refsynopsisdiv>
  49                 <para><filename>/etc/sysctl.d/*.conf</filename></para>
  50                 <para><filename>/run/sysctl.d/*.conf</filename></para>
  51                 <para><filename>/usr/lib/sysctl.d/*.conf</filename></para>
  52         </refsynopsisdiv>
  53
  54         <refsect1>
  55                 <title>Description</title>
  56
  57                 <para><command>systemd</command> uses configuration files
  58                 from the above directories to configure
  59                 <citerefentry><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>
  60                 kernel parameters to load during boot.</para>
  61         </refsect1>
  62
  63         <refsect1>
  64                 <title>Configuration Format</title>
  65
  66                 <para>The configuration files should simply contain a
  67                 list of variable assignments, separated by
  68                 newlines. Empty lines and lines whose first
  69                 non-whitespace character is # or ; are ignored.</para>
  70
  71                 <para>Note that both / and . are accepted as
  72                 separators in sysctl variable names.</para>
  73
  74                 <para>Each configuration file is named in the style of
  75                 <filename>&lt;program&gt;.conf</filename>.
  76                 Files in <filename>/etc/</filename> overwrite
  77                 files with the same name in <filename>/usr/lib/</filename>.
  78                 Files in <filename>/run</filename> overwrite files with
  79                 the same name in <filename>/etc/</filename> and
  80                 <filename>/usr/lib/</filename>. Packages should install their
  81                 configuration files in <filename>/usr/lib/</filename>, files
  82                 in <filename>/etc/</filename> are reserved for the local
  83                 administration, which possibly decides to overwrite the
  84                 configurations installed from packages. All files are sorted
  85                 by filename in alphabetical order, regardless in which of the
  86                 directories they reside, to ensure that a specific
  87                 configuration file takes precedence over another file with
  88                 an alphabetically later name.</para>
  89         </refsect1>
  90
  91         <refsect1>
  92                 <title>Example</title>
  93                 <example>
  94                         <title>/etc/sysctl.d/domain-name.conf example:</title>
  95
  96                         <programlisting># Set kernel YP domain name
  97 kernel.domainname=example.com</programlisting>
  98                 </example>
  99         </refsect1>
 100
 101         <refsect1>
 102                 <title>See Also</title>
 103                 <para>
 104                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 105                         <citerefentry><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 106                         <citerefentry><refentrytitle>sysctl.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 107                 </para>
 108         </refsect1>
 109
 110 </refentry>