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-<?xml version="1.0"?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
-<!DOCTYPE refsection PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
- "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-
-<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.</para>
- </refsection>
-
- <refsection id='main-conf'>
- <title>Configuration Directories and Precedence</title>
-
- <para>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. If multiple files
- specify the same option, the entry in the file with the
- lexicographically latest name takes precedence. 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>