fabe5c0e5f
This unifies much of the logic behind them: - All four will now ofllow the rule that the earlier file and earlier assignment in the .d/ directories wins. Before, sysctl was the only outlier, where the later setting always won. - All four now support getopt() and --help on the command line. - All four can now handle specification of configuration file names on the command line to apply. The tools will automatically find them, and apply them. Previously only tmpfiles could do that. This is useful for %post scripts in RPMs and suchlike. - This fixes various error path issues in conf_files_list()
128 lines
5.6 KiB
XML
128 lines
5.6 KiB
XML
<?xml version="1.0"?>
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<!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2011 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="sysctl.d">
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<refentryinfo>
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<title>sysctl.d</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sysctl.d</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sysctl.d</refname>
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<refpurpose>Configure kernel parameters at boot</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>/etc/sysctl.d/*.conf</filename></para>
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<para><filename>/run/sysctl.d/*.conf</filename></para>
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<para><filename>/usr/lib/sysctl.d/*.conf</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>At boot,
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<citerefentry><refentrytitle>systemd-sysctl.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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reads configuration files from the above directories
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to configure
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<citerefentry><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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kernel parameters.</para>
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</refsect1>
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<refsect1>
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<title>Configuration Format</title>
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<para>The configuration files contain a list of
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variable assignments, separated by newlines. Empty
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lines and lines whose first non-whitespace character
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is # or ; are ignored.</para>
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<para>Note that both / and . are accepted as label
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separators within sysctl variable
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names. <literal>kernel.domainname=foo</literal> and
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<literal>kernel/domainname=foo</literal> hence are
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entirely equivalent.</para>
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<para>Each configuration file shall be named in the
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style of <filename><program>.conf</filename>.
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Files in <filename>/etc/</filename> override files
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with the same name in <filename>/usr/lib/</filename>
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and <filename>/run/</filename>. Files in
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<filename>/run/</filename> override files with the same
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name in <filename>/usr/lib/</filename>. Packages
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should install their configuration files in
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<filename>/usr/lib/</filename>. Files in
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<filename>/etc/</filename> are reserved for the local
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administrator, who may use this logic to override the
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configuration files installed by vendor packages. All
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configuration files are sorted by their filename in
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alphabetical order, regardless in which of the
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directories they reside, to guarantee that a specific
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configuration file takes precedence over another file
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with an alphabetically later name, if both files
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contain the same variable setting.</para>
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<para>If the administrator wants to disable a
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configuration file supplied by the vendor the
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recommended way is to place a symlink to
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<filename>/dev/null</filename> in
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<filename>/etc/sysctl.d/</filename> bearing the
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same file name.</para>
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</refsect1>
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<refsect1>
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<title>Example</title>
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<example>
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<title>/etc/sysctl.d/domain-name.conf example:</title>
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<programlisting># Set kernel YP domain name
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kernel.domainname=example.com</programlisting>
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</example>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-sysctl.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-delta</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sysctl.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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