mirror of
https://github.com/systemd/systemd.git
synced 2024-11-05 06:52:22 +03:00
79 lines
4.0 KiB
XML
79 lines
4.0 KiB
XML
<?xml version="1.0"?>
|
|
<!DOCTYPE refsection PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
|
|
|
|
<!--
|
|
SPDX-License-Identifier: LGPL-2.1+
|
|
Copyright © 2014 Josh Triplett
|
|
-->
|
|
|
|
<refsection>
|
|
<refsection id='confd'>
|
|
<title>Configuration Directories and Precedence</title>
|
|
|
|
<para>Configuration files are read from directories in
|
|
<filename>/etc/</filename>, <filename>/run/</filename>, and
|
|
<filename>/usr/lib/</filename>, in order of precedence.
|
|
Each configuration file in these configuration directories shall be named in
|
|
the style of <filename><replaceable>filename</replaceable>.conf</filename>.
|
|
Files in <filename>/etc/</filename> override files with the same name in
|
|
<filename>/run/</filename> and <filename>/usr/lib/</filename>. Files in
|
|
<filename>/run/</filename> override files with the same name in
|
|
<filename>/usr/lib/</filename>.</para>
|
|
|
|
<para>Packages should install their configuration files in
|
|
<filename>/usr/lib/</filename>. Files in <filename>/etc/</filename> are
|
|
reserved for the local administrator, who may use this logic to override the
|
|
configuration files installed by vendor packages. All configuration files
|
|
are sorted by their filename in lexicographic order, regardless of which of
|
|
the directories they reside in. If multiple files specify the same option,
|
|
the entry in the file with the lexicographically latest name will take
|
|
precedence. It is recommended to prefix all filenames with a two-digit number
|
|
and a dash, to simplify the ordering of the files.</para>
|
|
|
|
<para>If the administrator wants to disable a configuration file supplied by
|
|
the vendor, the recommended way is to place a symlink to
|
|
<filename>/dev/null</filename> in the configuration directory in
|
|
<filename>/etc/</filename>, with the same filename as the vendor
|
|
configuration file. If the vendor configuration file is included in
|
|
the initrd image, the image has to be regenerated.</para>
|
|
</refsection>
|
|
|
|
<refsection id='main-conf'>
|
|
<title>Configuration Directories and Precedence</title>
|
|
|
|
<para>The default configuration is defined during compilation, so a
|
|
configuration file is only needed when it is necessary to deviate
|
|
from those defaults. By default, the configuration file in
|
|
<filename>/etc/systemd/</filename> contains commented out entries
|
|
showing the defaults as a guide to the administrator. This file
|
|
can be edited to create local overrides.
|
|
</para>
|
|
|
|
<para>When packages need to customize the configuration, they can
|
|
install configuration snippets in
|
|
<filename>/usr/lib/systemd/*.conf.d/</filename>. Files in
|
|
<filename>/etc/</filename> are reserved for the local
|
|
administrator, who may use this logic to override the
|
|
configuration files installed by vendor packages. The main
|
|
configuration file is read before any of the configuration
|
|
directories, and has the lowest precedence; entries in a file in
|
|
any configuration directory override entries in the single
|
|
configuration file. Files in the <filename>*.conf.d/</filename>
|
|
configuration subdirectories are sorted by their filename in lexicographic
|
|
order, regardless of which of the subdirectories they reside in. When
|
|
multiple files specify the same option, for options which accept just a
|
|
single value, the entry in the file with the lexicographically latest name
|
|
takes precedence. For options which accept a list of values, entries are
|
|
collected as they occur in files sorted lexicographically. It is recommended
|
|
to prefix all filenames in those subdirectories with a two-digit number and
|
|
a dash, to simplify the ordering of the files.</para>
|
|
|
|
<para>To disable a configuration file supplied by the vendor, the
|
|
recommended way is to place a symlink to
|
|
<filename>/dev/null</filename> in the configuration directory in
|
|
<filename>/etc/</filename>, with the same filename as the vendor
|
|
configuration file.</para>
|
|
</refsection>
|
|
</refsection>
|