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![Lennart Poettering](/assets/img/avatar_default.png)
For some reason the section for the systemd.exec man page was added incorrectly and then copypasted everywhere else incorrectly too. Let's fix that.
169 lines
6.8 KiB
XML
169 lines
6.8 KiB
XML
<?xml version="1.0"?>
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<!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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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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</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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<xi:include href="version-info.xml" xpointer="v230"/>
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</listitem>
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</varlistentry>
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<varlistentry id='strict'>
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<term><option>--strict=</option></term>
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<listitem>
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<para>Always return non-zero exit code on failure (including invalid sysctl variable
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name and insufficient permissions), unless the sysctl variable name is prefixed with a "-"
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character.</para>
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<xi:include href="version-info.xml" xpointer="v252"/>
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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="tldr" />
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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>Credentials</title>
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<para><command>systemd-sysctl</command> supports the service credentials logic as implemented by
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<varname>ImportCredential=</varname>/<varname>LoadCredential=</varname>/<varname>SetCredential=</varname>
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(see <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry> for
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details). The following credentials are used when passed in:</para>
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<variablelist class='system-credentials'>
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<varlistentry>
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<term><varname>sysctl.extra</varname></term>
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<listitem><para>The contents of this credential may contain additional lines to operate on. The
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credential contents should follow the same format as any other <filename>sysctl.d/</filename> drop-in
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configuration file. If this credential is passed it is processed after all of the drop-in files read
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from the file system. The settings configured in the credential hence take precedence over those in
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the file system.</para>
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<xi:include href="version-info.xml" xpointer="v252"/></listitem>
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</varlistentry>
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</variablelist>
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<para>Note that by default the <filename>systemd-sysctl.service</filename> unit file is set up to inherit
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the <literal>sysctl.extra</literal> credential from the service manager.</para>
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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><simplelist type="inline">
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<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry></member>
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<member><citerefentry project='man-pages'><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
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</simplelist></para>
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</refsect1>
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</refentry>
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