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-<?xml version="1.0"?>
-<!--*-nxml-*-->
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
-<!--
- This file is part of systemd.
-
- Copyright 2012 Lennart Poettering
-
- 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.
-
- 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.
-
- 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"
- xmlns:xi="http://www.w3.org/2001/XInclude">
-
- <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>
- <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 project='man-pages'><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 project='man-pages'><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry project='man-pages'><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
- </para>
- </refsect1>
-
-</refentry>