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<?xml version='1.0'?> <!--*-nxml-*-->
<?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
<!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.
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WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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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.kill">
<refentryinfo>
<title>systemd.kill</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.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>process</option>,
<option>mixed</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>process</option>, only the
main process itself is killed. 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>none</option>, no process is
killed. In this case, only the stop
command will be executed on unit stop,
but no process be killed
otherwise. Processes remaining alive
after stop are left in their control
group and the control group continues
to exist after stop unless it is
empty.</para>
<para>Processes will first be
terminated via
<constant>SIGTERM</constant> (unless
the signal to send is changed via
<varname>KillSignal=</varname>). Optionally,
this is immediately followed by a
<constant>SIGHUP</constant> (if
enabled with
<varname>SendSIGHUP=</varname>). If
then, after a delay (configured via the
<varname>TimeoutStopSec=</varname> option),
processes still remain, the
termination request is repeated with
the <constant>SIGKILL</constant>
signal (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 killing 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><refentrytitle>signal</refentrytitle><manvolnum>7</manvolnum></citerefentry>. Defaults
to <constant>SIGTERM</constant>.
</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> to remaining processes
after a timeout, if the normal
shutdown procedure left processes of
the service around. Takes a boolean
value. Defaults to "yes".
</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>8</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><refentrytitle>signal</refentrytitle><manvolnum>7</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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