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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">
<!--
+ SPDX-License-Identifier: LGPL-2.1+
+
This file is part of systemd.
Copyright 2012 Lennart Poettering
+-->
+<refentry id="systemd-sysctl.service"
+ xmlns:xi="http://www.w3.org/2001/XInclude">
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
+ <refentryinfo>
+ <title>systemd-sysctl.service</title>
+ <productname>systemd</productname>
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
+ <authorgroup>
+ <author>
+ <contrib>Developer</contrib>
+ <firstname>Lennart</firstname>
+ <surname>Poettering</surname>
+ <email>lennart@poettering.net</email>
+ </author>
+ </authorgroup>
+ </refentryinfo>
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
--->
-<refentry id="systemd-sysctl.service">
-
- <refentryinfo>
- <title>systemd-sysctl.service</title>
- <productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>Developer</contrib>
- <firstname>Lennart</firstname>
- <surname>Poettering</surname>
- <email>lennart@poettering.net</email>
- </author>
- </authorgroup>
- </refentryinfo>
-
- <refmeta>
- <refentrytitle>systemd-sysctl.service</refentrytitle>
- <manvolnum>8</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>systemd-sysctl.service</refname>
- <refname>systemd-sysctl</refname>
- <refpurpose>Configure kernel parameters at boot</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <para><filename>sysytemd-sysctl.service</filename></para>
- <para><filename>/usr/lib/systemd/systemd-sysctl</filename></para>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para><filename>systemd-sysctl.service</filename> is
- an early-boot service that configures
- <citerefentry><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>
- kernel parameters.</para>
-
- <para>See
- <citerefentry><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for information about the configuration of this
- service.</para>
- </refsect1>
-
- <refsect1>
- <title>See Also</title>
- <para>
- <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>wine</refentrytitle><manvolnum>8</manvolnum></citerefentry>
- </para>
- </refsect1>
+ <refmeta>
+ <refentrytitle>systemd-sysctl.service</refentrytitle>
+ <manvolnum>8</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>systemd-sysctl.service</refname>
+ <refname>systemd-sysctl</refname>
+ <refpurpose>Configure kernel parameters at boot</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <cmdsynopsis>
+ <command>/usr/lib/systemd/systemd-sysctl</command>
+ <arg choice="opt" rep="repeat">OPTIONS</arg>
+ <arg choice="opt" rep="repeat"><replaceable>CONFIGFILE</replaceable></arg>
+ </cmdsynopsis>
+ <para><filename>systemd-sysctl.service</filename></para>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><filename>systemd-sysctl.service</filename> is an early boot
+ service that configures
+ <citerefentry project='man-pages'><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+ kernel parameters by invoking <command>/usr/lib/systemd/systemd-sysctl</command>.</para>
+
+ <para>When invoked with no arguments, <command>/usr/lib/systemd/systemd-sysctl</command> applies
+ all directives from configuration files listed in
+ <citerefentry><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
+ If one or more filenames are passed on the command line, only the directives in these files are
+ applied.</para>
+
+ <para>In addition, <option>--prefix=</option> option may be used to limit which sysctl
+ settings are applied.</para>
+
+ <para>See
+ <citerefentry><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for information about the configuration of sysctl settings. After sysctl configuration is
+ changed on disk, it must be written to the files in <filename>/proc/sys</filename> before it
+ takes effect. It is possible to update specific settings, or simply to reload all configuration,
+ see Examples below.</para>
+ </refsect1>
+
+ <refsect1><title>Options</title>
+ <variablelist>
+ <varlistentry id='prefix'>
+ <term><option>--prefix=</option></term>
+ <listitem>
+ <para>Only apply rules with the specified prefix.</para>
+ </listitem>
+ </varlistentry>
+
+ <xi:include href="standard-options.xml" xpointer="help" />
+ <xi:include href="standard-options.xml" xpointer="version" />
+
+ </variablelist>
+ </refsect1>
+
+ <refsect1>
+ <title>Examples</title>
+
+ <example>
+ <title>Reset all sysctl settings</title>
+
+ <programlisting>systemctl restart systemd-sysctl</programlisting>
+ </example>
+
+ <example>
+ <title>View coredump handler configuration</title>
+
+ <programlisting># sysctl kernel.core_pattern
+kernel.core_pattern = |/usr/libexec/abrt-hook-ccpp %s %c %p %u %g %t %P %I
+</programlisting>
+ </example>
+
+ <example>
+ <title>Update coredump handler configuration</title>
+
+ <programlisting># /usr/lib/systemd/systemd-sysctl --prefix kernel.core_pattern</programlisting>
+
+ <para>This searches all the directories listed in
+ <citerefentry><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for configuration files and writes <filename>/proc/sys/kernel/core_pattern</filename>.</para>
+ </example>
+
+ <example>
+ <title>Update coredump handler configuration according to a specific file</title>
+
+ <programlisting># /usr/lib/systemd/systemd-sysctl 50-coredump.conf</programlisting>
+
+ <para>This applies all the settings found in <filename>50-coredump.conf</filename>.
+ Either <filename>/etc/sysctl.d/50-coredump.conf</filename>, or
+ <filename>/run/sysctl.d/50-coredump.conf</filename>, or
+ <filename>/usr/lib/sysctl.d/50-coredump.conf</filename> will be used, in the order
+ of preference.</para>
+ </example>
+
+ <para>See
+ <citerefentry project='man-pages'><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+ for various ways to directly apply sysctl settings.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>See Also</title>
+ <para>
+ <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry project='man-pages'><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+ </para>
+ </refsect1>
</refentry>
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