Adding upstream version 252.22.upstream/252.22upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 195 insertions, 0 deletions

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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">
+  <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></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>
+        </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>
+        </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 "no".
+        </para></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 "yes".
+        </para></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></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></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>