Lennart Poettering
818bf54632
This part of the copyright blurb stems from the GPL use recommendations: https://www.gnu.org/licenses/gpl-howto.en.html The concept appears to originate in times where version control was per file, instead of per tree, and was a way to glue the files together. Ultimately, we nowadays don't live in that world anymore, and this information is entirely useless anyway, as people are very welcome to copy these files into any projects they like, and they shouldn't have to change bits that are part of our copyright header for that. hence, let's just get rid of this old cruft, and shorten our codebase a bit.
142 lines
5.1 KiB
XML
142 lines
5.1 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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SPDX-License-Identifier: LGPL-2.1+
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Copyright 2012 Lennart Poettering
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-->
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<refentry id="systemd-sysctl.service"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-sysctl.service</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>systemd-sysctl.service</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-sysctl.service</refname>
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<refname>systemd-sysctl</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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<cmdsynopsis>
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<command>/usr/lib/systemd/systemd-sysctl</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="opt" rep="repeat"><replaceable>CONFIGFILE</replaceable></arg>
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</cmdsynopsis>
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<para><filename>systemd-sysctl.service</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><filename>systemd-sysctl.service</filename> is an early boot
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service that configures
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<citerefentry project='man-pages'><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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kernel parameters by invoking <command>/usr/lib/systemd/systemd-sysctl</command>.</para>
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<para>When invoked with no arguments, <command>/usr/lib/systemd/systemd-sysctl</command> applies
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all directives from configuration files listed in
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<citerefentry><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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If one or more filenames are passed on the command line, only the directives in these files are
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applied.</para>
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<para>In addition, <option>--prefix=</option> option may be used to limit which sysctl
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settings are applied.</para>
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<para>See
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<citerefentry><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for information about the configuration of sysctl settings. After sysctl configuration is
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changed on disk, it must be written to the files in <filename>/proc/sys</filename> before it
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takes effect. It is possible to update specific settings, or simply to reload all configuration,
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see Examples below.</para>
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</refsect1>
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<refsect1><title>Options</title>
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<variablelist>
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<varlistentry id='prefix'>
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<term><option>--prefix=</option></term>
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<listitem>
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<para>Only apply rules with the specified prefix.</para>
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</listitem>
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</varlistentry>
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<xi:include href="standard-options.xml" xpointer="cat-config" />
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<xi:include href="standard-options.xml" xpointer="no-pager" />
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<xi:include href="standard-options.xml" xpointer="help" />
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<xi:include href="standard-options.xml" xpointer="version" />
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<example>
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<title>Reset all sysctl settings</title>
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<programlisting>systemctl restart systemd-sysctl</programlisting>
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</example>
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<example>
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<title>View coredump handler configuration</title>
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<programlisting># sysctl kernel.core_pattern
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kernel.core_pattern = |/usr/libexec/abrt-hook-ccpp %s %c %p %u %g %t %P %I
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</programlisting>
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</example>
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<example>
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<title>Update coredump handler configuration</title>
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<programlisting># /usr/lib/systemd/systemd-sysctl --prefix kernel.core_pattern</programlisting>
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<para>This searches all the directories listed in
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<citerefentry><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for configuration files and writes <filename>/proc/sys/kernel/core_pattern</filename>.</para>
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</example>
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<example>
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<title>Update coredump handler configuration according to a specific file</title>
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<programlisting># /usr/lib/systemd/systemd-sysctl 50-coredump.conf</programlisting>
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<para>This applies all the settings found in <filename>50-coredump.conf</filename>.
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Either <filename>/etc/sysctl.d/50-coredump.conf</filename>, or
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<filename>/run/sysctl.d/50-coredump.conf</filename>, or
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<filename>/usr/lib/sysctl.d/50-coredump.conf</filename> will be used, in the order
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of preference.</para>
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</example>
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<para>See
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<citerefentry project='man-pages'><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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for various ways to directly apply sysctl settings.</para>
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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>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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</para>
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</refsect1>
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</refentry>
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