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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 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>/etc/sysctl.d/*.conf</filename></para> | |
db1413d7 | 50 | <para><filename>/run/sysctl.d/*.conf</filename></para> |
fc1a2e06 | 51 | <para><filename>/usr/lib/sysctl.d/*.conf</filename></para> |
c91faef3 LP |
52 | </refsynopsisdiv> |
53 | ||
54 | <refsect1> | |
55 | <title>Description</title> | |
56 | ||
772f8371 KS |
57 | <para><command>systemd</command> uses configuration files |
58 | from the above directories to configure | |
c91faef3 | 59 | <citerefentry><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry> |
772f8371 | 60 | kernel parameters to load during boot.</para> |
c91faef3 LP |
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 | ||
772f8371 KS |
74 | <para>Each configuration file is named in the style of |
75 | <filename><program>.conf</filename>. | |
76 | Files in <filename>/etc/</filename> overwrite | |
db1413d7 KS |
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> | |
c91faef3 LP |
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> |