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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 Lesser General Public License as published by | |
11 | the Free Software Foundation; either version 2.1 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 | Lesser General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU Lesser 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>/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>At boot, | |
58 | <citerefentry><refentrytitle>systemd-sysctl.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
59 | reads configuration files from the above directories | |
60 | to configure | |
61 | <citerefentry><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
62 | kernel parameters.</para> | |
63 | </refsect1> | |
64 | ||
65 | <refsect1> | |
66 | <title>Configuration Format</title> | |
67 | ||
68 | <para>The configuration files contain a list of | |
69 | variable assignments, separated by newlines. Empty | |
70 | lines and lines whose first non-whitespace character | |
71 | is # or ; are ignored.</para> | |
72 | ||
73 | <para>Note that both / and . are accepted as label | |
74 | separators within sysctl variable | |
75 | names. <literal>kernel.domainname=foo</literal> and | |
76 | <literal>kernel/domainname=foo</literal> hence are | |
77 | entirely equivalent.</para> | |
78 | ||
79 | <para>Each configuration file shall be named in the | |
80 | style of <filename><replaceable>program</replaceable>.conf</filename>. | |
81 | Files in <filename>/etc/</filename> override files | |
82 | with the same name in <filename>/usr/lib/</filename> | |
83 | and <filename>/run/</filename>. Files in | |
84 | <filename>/run/</filename> override files with the same | |
85 | name in <filename>/usr/lib/</filename>. Packages | |
86 | should install their configuration files in | |
87 | <filename>/usr/lib/</filename>. Files in | |
88 | <filename>/etc/</filename> are reserved for the local | |
89 | administrator, who may use this logic to override the | |
90 | configuration files installed by vendor packages. All | |
91 | configuration files are sorted by their filename in | |
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92 | lexicographic order, regardless in which of the |
93 | directories they reside. If multiple files specify the | |
94 | same variable name, the entry in the file with the | |
95 | lexicographically latest name will be applied. It is | |
96 | recommended to prefix all filenames with a two-digit | |
97 | number and a dash, to simplify the ordering of the | |
98 | files.</para> | |
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99 | |
100 | <para>If the administrator wants to disable a | |
14228c0d | 101 | configuration file supplied by the vendor, the |
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102 | recommended way is to place a symlink to |
103 | <filename>/dev/null</filename> in | |
104 | <filename>/etc/sysctl.d/</filename> bearing the | |
14228c0d | 105 | same filename.</para> |
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106 | </refsect1> |
107 | ||
108 | <refsect1> | |
109 | <title>Example</title> | |
110 | <example> | |
111 | <title>/etc/sysctl.d/domain-name.conf example:</title> | |
112 | ||
113 | <programlisting># Set kernel YP domain name | |
114 | kernel.domainname=example.com</programlisting> | |
115 | </example> | |
116 | </refsect1> | |
117 | ||
118 | <refsect1> | |
119 | <title>See Also</title> | |
120 | <para> | |
121 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
122 | <citerefentry><refentrytitle>systemd-sysctl.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
123 | <citerefentry><refentrytitle>systemd-delta</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
124 | <citerefentry><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
125 | <citerefentry><refentrytitle>sysctl.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
126 | </para> | |
127 | </refsect1> | |
128 | ||
129 | </refentry> |