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[elogind.git] / 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">
4 <!--
5   This file is part of systemd.
6
7   Copyright 2011 Lennart Poettering
8
9   systemd is free software; you can redistribute it and/or modify it
10   under the terms of the GNU General Public License as published by
11   the Free Software Foundation; either version 2 of the License, or
12   (at your option) any later version.
13
14   systemd is distributed in the hope that it will be useful, but
15   WITHOUT ANY WARRANTY; without even the implied warranty of
16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17   General Public License for more details.
18
19   You should have received a copy of the GNU General Public License
20   along with systemd; If not, see <http://www.gnu.org/licenses/>.
21 -->
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>/usr/lib/sysctl.d/*.conf</filename></para>
50                 <para><filename>/etc/sysctl.d/*.conf</filename></para>
51                 <para><filename>/run/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>