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<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='conf'>

<title>Configuration File</title>

<para>Configuration is also read from a single configuration file in

<filename>/etc/</filename>. This 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.</para>

</refsection>

</refsection>