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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 20:49:52 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 20:49:52 +0000
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Adding upstream version 255.4.upstream/255.4
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+<?xml version='1.0'?> <!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
+
+<refentry id="systemd.kill" xmlns:xi="http://www.w3.org/2001/XInclude">
+ <refentryinfo>
+ <title>systemd.kill</title>
+ <productname>systemd</productname>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>systemd.kill</refentrytitle>
+ <manvolnum>5</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>systemd.kill</refname>
+ <refpurpose>Process killing procedure
+ configuration</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <para><filename><replaceable>service</replaceable>.service</filename>,
+ <filename><replaceable>socket</replaceable>.socket</filename>,
+ <filename><replaceable>mount</replaceable>.mount</filename>,
+ <filename><replaceable>swap</replaceable>.swap</filename>,
+ <filename><replaceable>scope</replaceable>.scope</filename></para>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para>Unit configuration files for services, sockets, mount
+ points, swap devices and scopes share a subset of configuration
+ options which define the killing procedure of processes belonging
+ to the unit.</para>
+
+ <para>This man page lists the configuration options shared by
+ these five unit types. See
+ <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for the common options shared by all unit configuration files, and
+ <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd.swap</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ and
+ <citerefentry><refentrytitle>systemd.scope</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for more information on the configuration file options specific to
+ each unit type.</para>
+
+ <para>The kill procedure configuration options are configured in
+ the [Service], [Socket], [Mount] or [Swap] section, depending on
+ the unit type.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Options</title>
+
+ <variablelist class='unit-directives'>
+
+ <varlistentry>
+ <term><varname>KillMode=</varname></term>
+ <listitem><para>Specifies how processes of this unit shall be killed. One of
+ <option>control-group</option>, <option>mixed</option>, <option>process</option>,
+ <option>none</option>.</para>
+
+ <para>If set to <option>control-group</option>, all remaining processes in the control group of this
+ unit will be killed on unit stop (for services: after the stop command is executed, as configured
+ with <varname>ExecStop=</varname>). If set to <option>mixed</option>, the
+ <constant>SIGTERM</constant> signal (see below) is sent to the main process while the subsequent
+ <constant>SIGKILL</constant> signal (see below) is sent to all remaining processes of the unit's
+ control group. If set to <option>process</option>, only the main process itself is killed (not
+ recommended!). If set to <option>none</option>, no process is killed (strongly recommended
+ against!). In this case, only the stop command will be executed on unit stop, but no process will be
+ killed otherwise. Processes remaining alive after stop are left in their control group and the
+ control group continues to exist after stop unless empty.</para>
+
+ <para>Note that it is not recommended to set <varname>KillMode=</varname> to
+ <constant>process</constant> or even <constant>none</constant>, as this allows processes to escape
+ the service manager's lifecycle and resource management, and to remain running even while their
+ service is considered stopped and is assumed to not consume any resources.</para>
+
+ <para>Processes will first be terminated via <constant>SIGTERM</constant> (unless the signal to send
+ is changed via <varname>KillSignal=</varname> or <varname>RestartKillSignal=</varname>). Optionally,
+ this is immediately followed by a <constant>SIGHUP</constant> (if enabled with
+ <varname>SendSIGHUP=</varname>). If processes still remain after:
+ <itemizedlist>
+ <listitem><para>the main process of a unit has exited (applies to <varname>KillMode=</varname>:
+ <option>mixed</option>)</para></listitem>
+ <listitem><para>the delay configured via the <varname>TimeoutStopSec=</varname> has passed
+ (applies to <varname>KillMode=</varname>: <option>control-group</option>, <option>mixed</option>,
+ <option>process</option>)</para></listitem>
+ </itemizedlist>
+
+ the termination request is repeated with the <constant>SIGKILL</constant> signal or the signal specified via
+ <varname>FinalKillSignal=</varname> (unless this is disabled via the <varname>SendSIGKILL=</varname>
+ option). See <citerefentry><refentrytitle>kill</refentrytitle><manvolnum>2</manvolnum></citerefentry>
+ for more information.</para>
+
+ <para>Defaults to <option>control-group</option>.</para>
+
+ <xi:include href="version-info.xml" xpointer="v187"/></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>KillSignal=</varname></term>
+ <listitem><para>Specifies which signal to use when stopping a service. This controls the signal that
+ is sent as first step of shutting down a unit (see above), and is usually followed by
+ <constant>SIGKILL</constant> (see above and below). For a list of valid signals, see
+ <citerefentry project='man-pages'><refentrytitle>signal</refentrytitle><manvolnum>7</manvolnum></citerefentry>.
+ Defaults to <constant>SIGTERM</constant>.</para>
+
+ <para>Note that, right after sending the signal specified in this setting, systemd will always send
+ <constant>SIGCONT</constant>, to ensure that even suspended tasks can be terminated cleanly.</para>
+
+ <xi:include href="version-info.xml" xpointer="v187"/>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>RestartKillSignal=</varname></term>
+ <listitem><para>Specifies which signal to use when restarting a service. The same as
+ <varname>KillSignal=</varname> described above, with the exception that this setting is used in a
+ restart job. Not set by default, and the value of <varname>KillSignal=</varname> is used.</para>
+
+ <xi:include href="version-info.xml" xpointer="v244"/>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>SendSIGHUP=</varname></term>
+ <listitem><para>Specifies whether to send
+ <constant>SIGHUP</constant> to remaining processes immediately
+ after sending the signal configured with
+ <varname>KillSignal=</varname>. This is useful to indicate to
+ shells and shell-like programs that their connection has been
+ severed. Takes a boolean value. Defaults to <literal>no</literal>.
+ </para>
+
+ <xi:include href="version-info.xml" xpointer="v207"/></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>SendSIGKILL=</varname></term>
+ <listitem><para>Specifies whether to send
+ <constant>SIGKILL</constant> (or the signal specified by
+ <varname>FinalKillSignal=</varname>) to remaining processes
+ after a timeout, if the normal shutdown procedure left
+ processes of the service around. When disabled, a
+ <varname>KillMode=</varname> of <constant>control-group</constant>
+ or <constant>mixed</constant> service will not restart if
+ processes from prior services exist within the control group.
+ Takes a boolean value. Defaults to <literal>yes</literal>.
+ </para>
+
+ <xi:include href="version-info.xml" xpointer="v187"/></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>FinalKillSignal=</varname></term>
+ <listitem><para>Specifies which signal to send to remaining
+ processes after a timeout if <varname>SendSIGKILL=</varname>
+ is enabled. The signal configured here should be one that is
+ not typically caught and processed by services (<constant>SIGTERM</constant>
+ is not suitable). Developers can find it useful to use this to
+ generate a coredump to troubleshoot why a service did not
+ terminate upon receiving the initial <constant>SIGTERM</constant>
+ signal. This can be achieved by configuring <varname>LimitCORE=</varname>
+ and setting <varname>FinalKillSignal=</varname> to either
+ <constant>SIGQUIT</constant> or <constant>SIGABRT</constant>.
+ Defaults to <constant>SIGKILL</constant>.
+ </para>
+
+ <xi:include href="version-info.xml" xpointer="v240"/></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>WatchdogSignal=</varname></term>
+ <listitem><para>Specifies which signal to use to terminate the
+ service when the watchdog timeout expires (enabled through
+ <varname>WatchdogSec=</varname>). Defaults to <constant>SIGABRT</constant>.
+ </para>
+
+ <xi:include href="version-info.xml" xpointer="v240"/></listitem>
+ </varlistentry>
+
+ </variablelist>
+ </refsect1>
+
+ <refsect1>
+ <title>See Also</title>
+ <para>
+ <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd.swap</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>kill</refentrytitle><manvolnum>2</manvolnum></citerefentry>,
+ <citerefentry project='man-pages'><refentrytitle>signal</refentrytitle><manvolnum>7</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>