execute: make sending of SIGKILL on shutdown optional

[elogind.git] / man / systemd.service.xml

diff --git a/man/systemd.service.xml b/man/systemd.service.xml
index 91d6d094099ab99f0c37d365fc79e8c0888cd7c7..ee4d3937565b97c6f35649170212f6f8c2ab56f8 100644 (file)
--- a/man/systemd.service.xml
+++ b/man/systemd.service.xml
@@ -88,6 +88,14 @@
                 system shutdown. Only services involved with early
                 boot or late system shutdown should disable this
                 option.</para>
                 system shutdown. Only services involved with early
                 boot or late system shutdown should disable this
                 option.</para>

+
+                <para>If a service is requested under a certain name
+                but no unit configuration file is found, systemd looks
+                for a SysV init script by the same name (with the
+                <filename>.service</filename> suffix removed) and
+                dynamically creates a service unit from that
+                script. This is useful for compatibility with
+                SysV.</para>

         </refsect1>
 
         <refsect1>
         </refsect1>
 
         <refsect1>


@@ -111,7 +119,7 @@
                                 start-up type for this service
                                 unit. One of <option>simple</option>,
                                 <option>forking</option>,
                                 start-up type for this service
                                 unit. One of <option>simple</option>,
                                 <option>forking</option>,

-                                <option>finish</option>,
+                                <option>oneshot</option>,

                                 <option>dbus</option>,
                                 <option>notify</option>.</para>
 
                                 <option>dbus</option>,
                                 <option>notify</option>.</para>
 


@@ -121,25 +129,27 @@
                                 configured with
                                 <varname>ExecStart=</varname> is the
                                 main process of the service. In this
                                 configured with
                                 <varname>ExecStart=</varname> is the
                                 main process of the service. In this

-                                mode, communication channels must be
-                                installed before the daemon is started
-                                up (e.g. sockets set up by systemd,
-                                via socket activation), as systemd
-                                will immediately proceed starting
-                                follow-up units.</para>
+                                mode, if the process offers
+                                functionality to other processes on
+                                the system its communication channels
+                                should be installed before the daemon
+                                is started up (e.g. sockets set up by
+                                systemd, via socket activation), as
+                                systemd will immediately proceed
+                                starting follow-up units.</para>

 
                                 <para>If set to
                                 <option>forking</option> it is
                                 expected that the process configured
                                 with <varname>ExecStart=</varname>
 
                                 <para>If set to
                                 <option>forking</option> it is
                                 expected that the process configured
                                 with <varname>ExecStart=</varname>

-                                will start up and call
-                                <function>fork()</function>. The
-                                parent process is expected to finish
-                                when start-up is complete and all
-                                communication channels set up. The
-                                child continues to run as the main
-                                daemon process. This is the behaviour
-                                of traditional UNIX daemons. If this
+                                will call <function>fork()</function>
+                                as part of its start-up. The parent process is
+                                expected to exit when start-up is
+                                complete and all communication
+                                channels set up. The child continues
+                                to run as the main daemon
+                                process. This is the behaviour of
+                                traditional UNIX daemons. If this

                                 setting is used, it is recommended to
                                 also use the
                                 <varname>PIDFile=</varname> option, so
                                 setting is used, it is recommended to
                                 also use the
                                 <varname>PIDFile=</varname> option, so


@@ -150,11 +160,11 @@
                                 exits.</para>
 
                                 <para>Behaviour of
                                 exits.</para>
 
                                 <para>Behaviour of

-                                <option>finish</option> is similar
+                                <option>oneshot</option> is similar

                                 to <option>simple</option>, however
                                 it is expected that the process has to
                                 exit before systemd starts follow-up
                                 to <option>simple</option>, however
                                 it is expected that the process has to
                                 exit before systemd starts follow-up

-                                units. <varname>ValidNoProcess=</varname>
+                                units. <varname>RemainAfterExit=</varname>

                                 is particularly useful for this type
                                 of service.</para>
 
                                 is particularly useful for this type
                                 of service.</para>
 


@@ -168,7 +178,7 @@
                                 will proceed starting follow-up units
                                 after the D-Bus bus name has been
                                 acquired. Service units with this
                                 will proceed starting follow-up units
                                 after the D-Bus bus name has been
                                 acquired. Service units with this

-                                option configured implicitly have
+                                option configured implicitly gain

                                 dependencies on the
                                 <filename>dbus.target</filename>
                                 unit.</para>
                                 dependencies on the
                                 <filename>dbus.target</filename>
                                 unit.</para>


@@ -185,17 +195,17 @@
                                 notification message has been sent. If
                                 this option is used
                                 <varname>NotifyAccess=</varname> (see
                                 notification message has been sent. If
                                 this option is used
                                 <varname>NotifyAccess=</varname> (see

-                                below) must be set to open access to
+                                below) should be set to open access to

                                 the notification socket provided by
                                 systemd. If
                                 <varname>NotifyAccess=</varname> is not
                                 the notification socket provided by
                                 systemd. If
                                 <varname>NotifyAccess=</varname> is not

-                                set, it will be implicitly set to
+                                set, it will implicitly be set to

                                 <option>main</option>.</para>
                                 </listitem>
                         </varlistentry>
 
                         <varlistentry>
                                 <option>main</option>.</para>
                                 </listitem>
                         </varlistentry>
 
                         <varlistentry>

-                                <term><varname>ValidNoProcess=</varname></term>
+                                <term><varname>RemainAfterExit=</varname></term>

 
                                 <listitem><para>Takes a boolean value
                                 that specifies whether the service
 
                                 <listitem><para>Takes a boolean value
                                 that specifies whether the service


@@ -242,18 +252,51 @@
                                 arguments for the process. It is
                                 mandatory to set this option for all
                                 services. This option may not be
                                 arguments for the process. It is
                                 mandatory to set this option for all
                                 services. This option may not be

-                                specified more than once. Optionally,
-                                if the absolute file name is prefixed
-                                with <literal>@</literal>, the second
-                                token will be passed as
+                                specified more than once, except when
+                                <varname>Type=oneshot</varname> is
+                                used in which case more than one
+                                <varname>ExecStart=</varname> line is
+                                accepted which are then invoked one by
+                                one, sequentially in the order they
+                                appear in the unit file.</para>
+
+                                <para>Optionally, if the absolute file
+                                name is prefixed with
+                                <literal>@</literal>, the second token
+                                will be passed as

                                 <literal>argv[0]</literal> to the
                                 executed process, followed by the
                                 <literal>argv[0]</literal> to the
                                 executed process, followed by the

-                                further arguments specified. Unless
-                                <varname>Type=forking</varname> is set,
-                                the process started via this command
-                                line will be considered the main
-                                process of the
-                                daemon.</para></listitem>
+                                further arguments specified. If the
+                                first token is prefixed with
+                                <literal>-</literal> an exit code of
+                                the command normally considered a
+                                failure (i.e. non-zero exit status or
+                                abnormal exit due to signal) is ignored
+                                and considered success. If both
+                                <literal>-</literal> and
+                                <literal>@</literal> are used for the
+                                same command the former must precede
+                                the latter. Unless
+                                <varname>Type=forking</varname> is
+                                set, the process started via this
+                                command line will be considered the
+                                main process of the daemon. The
+                                command line accepts % specifiers as
+                                described in
+                                <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>. On
+                                top of that basic environment variable
+                                substitution is supported, where
+                                <literal>${FOO}</literal> is replaced
+                                by the string value of the environment
+                                variable of the same name. Also
+                                <literal>$FOO</literal> may appear as
+                                separate word on the command line in
+                                which case the variable is replaced by
+                                its value split at whitespaces. Note
+                                that the first argument (i.e. the
+                                binary to execute) may not be a
+                                variable, and must be a literal and
+                                absolute path name.</para></listitem>

                         </varlistentry>
 
                         <varlistentry>
                         </varlistentry>
 
                         <varlistentry>


@@ -262,31 +305,58 @@
                                 <listitem><para>Additional commands
                                 that are executed before (resp. after)
                                 the command in
                                 <listitem><para>Additional commands
                                 that are executed before (resp. after)
                                 the command in

-                                <varname>ExecStart=</varname>. If
-                                specified more than once, all commands
-                                are executed one after the other,
-                                serially. Use of these settings is
-                                optional.</para></listitem>
+                                <varname>ExecStart=</varname>. Multiple
+                                command lines may be concatenated in a
+                                single directive, by separating them
+                                by semicolons (these semicolons must
+                                be passed as separate words). In that
+                                case, the commands are executed one
+                                after the other,
+                                serially. Alternatively, these
+                                directives may be specified more than
+                                once with the same effect. However,
+                                the latter syntax is not recommended
+                                for compatibility with parsers
+                                suitable for XDG
+                                <filename>.desktop</filename> files.
+                                Use of these settings is
+                                optional. Specifier and environment
+                                variable substitution is
+                                supported.</para></listitem>

                         </varlistentry>
 
                         <varlistentry>
                                 <term><varname>ExecReload=</varname></term>
                                 <listitem><para>Commands to execute to
                                 trigger a configuration reload in the
                         </varlistentry>
 
                         <varlistentry>
                                 <term><varname>ExecReload=</varname></term>
                                 <listitem><para>Commands to execute to
                                 trigger a configuration reload in the

-                                service. If used more than once, all
-                                commands are executed one after the
-                                other, serially. Use of this setting is optional.
-                                </para></listitem>
+                                service. This argument takes multiple
+                                command lines, following the same
+                                scheme as pointed out for
+                                <varname>ExecStartPre=</varname>
+                                above. Use of this setting is
+                                optional. Specifier and environment
+                                variable substitution is supported
+                                here following the same scheme as for
+                                <varname>ExecStart=</varname>. One
+                                special environment variable is set:
+                                if known <literal>$MAINPID</literal> is
+                                set to the main process of the
+                                daemon, and may be used for command
+                                lines like the following:
+                                <command>/bin/kill -HUP
+                                $MAINPID</command>.</para></listitem>

                         </varlistentry>
 
                         <varlistentry>
                                 <term><varname>ExecStop=</varname></term>
                                 <listitem><para>Commands to execute to
                                 stop the service started via
                         </varlistentry>
 
                         <varlistentry>
                                 <term><varname>ExecStop=</varname></term>
                                 <listitem><para>Commands to execute to
                                 stop the service started via

-                                <varname>ExecStart=</varname>. If used
-                                more than once, all commands are
-                                executed one after the other,
-                                serially. Use of this setting is
+                                <varname>ExecStart=</varname>. This
+                                argument takes multiple command lines,
+                                following the same scheme as pointed
+                                out for
+                                <varname>ExecStartPre=</varname>
+                                above. Use of this setting is

                                 optional. All processes remaining for
                                 a service after the commands
                                 configured in this option are run are
                                 optional. All processes remaining for
                                 a service after the commands
                                 configured in this option are run are


@@ -295,7 +365,11 @@
                                 (see below). If this option is not
                                 specified the process is terminated
                                 right-away when service stop is
                                 (see below). If this option is not
                                 specified the process is terminated
                                 right-away when service stop is

-                                requested.</para></listitem>
+                                requested. Specifier and environment
+                                variable substitution is supported
+                                (including
+                                <literal>$MAINPID</literal>, see
+                                above).</para></listitem>

                         </varlistentry>
 
                         <varlistentry>
                         </varlistentry>
 
                         <varlistentry>


@@ -304,11 +378,15 @@
                                 that are executed after the service
                                 was stopped using the commands
                                 configured in
                                 that are executed after the service
                                 was stopped using the commands
                                 configured in

-                                <varname>ExecStop=</varname>. If
-                                specified more than once, all commands
-                                are executed one after the other,
-                                serially. Use of these settings is
-                                optional.</para></listitem>
+                                <varname>ExecStop=</varname>. This
+                                argument takes multiple command lines,
+                                following the same scheme as pointed
+                                out for
+                                <varname>ExecStartPre</varname>. Use
+                                of these settings is
+                                optional. Specifier and environment
+                                variable substitution is
+                                supported.</para></listitem>

                         </varlistentry>
 
                         <varlistentry>
                         </varlistentry>
 
                         <varlistentry>


@@ -348,19 +426,28 @@
                         <varlistentry>
                                 <term><varname>Restart=</varname></term>
                                 <listitem><para>Configures whether the
                         <varlistentry>
                                 <term><varname>Restart=</varname></term>
                                 <listitem><para>Configures whether the

-                                main service process shall be restarted when
-                                it exists. Takes one of
-                                <option>once</option>,
-                                <option>restart-on-success</option> or
-                                <option>restart-always</option>. If
-                                set to <option>once</option> (the
-                                default) the service will not be
-                                restarted when it exits. If set to
-                                <option>restart-on-success</option> it
-                                will be restarted only when it exited
-                                cleanly, i.e. terminated with an exit
-                                code of 0. If set to
-                                <option>restart-always</option> the
+                                main service process shall be
+                                restarted when it exits. Takes one of
+                                <option>no</option>,
+                                <option>on-success</option>,
+                                <option>on-failure</option>,
+                                <option>on-abort</option> or
+                                <option>always</option>. If set to
+                                <option>no</option> (the default) the
+                                service will not be restarted when it
+                                exits. If set to
+                                <option>on-success</option> it will be
+                                restarted only when it exited cleanly,
+                                i.e. terminated with an exit code of
+                                0. If set to
+                                <option>on-failure</option> it will be
+                                restarted only when it exited with an
+                                exit code not equalling 0, or when
+                                terminated by a signal. If set to
+                                <option>on-abort</option> it will be
+                                restarted only if it exits due to
+                                reception of an uncaught signal. If
+                                set to <option>always</option> the

                                 service will be restarted regardless
                                 whether it exited cleanly or not, or
                                 got terminated abnormally by a
                                 service will be restarted regardless
                                 whether it exited cleanly or not, or
                                 got terminated abnormally by a


@@ -470,20 +557,44 @@
                                 group and the control group continues
                                 to exist after stop unless it is
                                 empty. Defaults to
                                 group and the control group continues
                                 to exist after stop unless it is
                                 empty. Defaults to

-                                <option>control-croup</option>.</para>
+                                <option>control-group</option>.</para>

 
                                 <para>Processes will first be
 
                                 <para>Processes will first be

-                                terminated via SIGTERM. If then after
-                                a delay (configured via the
+                                terminated via SIGTERM (unless the
+                                signal to send is changed via
+                                <varname>KillSignal=</varname>). If
+                                then after a delay (configured via the

                                 <varname>TimeoutSec=</varname> option)
                                 processes still remain, the
                                 termination request is repeated with
                                 <varname>TimeoutSec=</varname> option)
                                 processes still remain, the
                                 termination request is repeated with

-                                the SIGKILL signal. See
+                                the SIGKILL signal (unless this is
+                                disabled via the
+                                <varname>SendSIGKILL=</varname>
+                                option). See

                                 <citerefentry><refentrytitle>kill</refentrytitle><manvolnum>2</manvolnum></citerefentry>
                                 for more
                                 information.</para></listitem>
                         </varlistentry>
 
                                 <citerefentry><refentrytitle>kill</refentrytitle><manvolnum>2</manvolnum></citerefentry>
                                 for more
                                 information.</para></listitem>
                         </varlistentry>
 

+                        <varlistentry>
+                                <term><varname>KillSignal=</varname></term>
+                                <listitem><para>Specifies which signal
+                                to use when killing a
+                                service. Defaults to SIGTERM.
+                                </para></listitem>
+                        </varlistentry>
+
+                        <varlistentry>
+                                <term><varname>SendSIGKILL=</varname></term>
+                                <listitem><para>Specifies whether to
+                                send SIGKILL 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>
+

                         <varlistentry>
                                 <term><varname>NonBlocking=</varname></term>
                                 <listitem><para>Set O_NONBLOCK flag
                         <varlistentry>
                                 <term><varname>NonBlocking=</varname></term>
                                 <listitem><para>Set O_NONBLOCK flag


@@ -510,7 +621,7 @@
                                 <option>main</option> or
                                 <option>all</option>. If
                                 <option>none</option> no daemon status
                                 <option>main</option> or
                                 <option>all</option>. If
                                 <option>none</option> no daemon status

-                                updates are accepted by the service
+                                updates are accepted from the service

                                 processes, all status update messages
                                 are ignored. If <option>main</option>
                                 only service updates sent from the
                                 processes, all status update messages
                                 are ignored. If <option>main</option>
                                 only service updates sent from the


@@ -524,13 +635,67 @@
                                 <varname>Type=notify</varname> (see above).</para></listitem>
                         </varlistentry>
 
                                 <varname>Type=notify</varname> (see above).</para></listitem>
                         </varlistentry>
 

+                        <varlistentry>
+                                <term><varname>Sockets=</varname></term>
+                                <listitem><para>Specifies the name of
+                                the socket units this service shall
+                                inherit the sockets from when the
+                                service (ignoring the different suffix
+                                of course) is started. Normally it
+                                should not be necessary to use this
+                                setting as all sockets whose unit
+                                shares the same name as the service
+                                are passed to the spawned
+                                process.</para>
+
+                                <para>Note that the same socket may be
+                                passed to multiple processes at the
+                                same time. Also note that a different
+                                service may be activated on incoming
+                                traffic than inherits the sockets. Or
+                                in other words: The
+                                <varname>Service=</varname> setting of
+                                <filename>.socket</filename> units
+                                doesn't have to match the inverse of the
+                                <varname>Sockets=</varname> setting of
+                                the <filename>.service</filename> it
+                                refers to.</para></listitem>
+                        </varlistentry>
+
+                        <varlistentry>
+                                <term><varname>FsckPassNo=</varname></term>
+                                <listitem><para>Set the fsck passno
+                                priority to use to order this service
+                                in relation to other file system
+                                checking services. This option is only
+                                necessary to fix ordering in relation
+                                to fsck jobs automatically created for
+                                all <filename>/etc/fstab</filename>
+                                entries with a value in the fs_passno
+                                column > 0. As such it should only be
+                                used as option for fsck
+                                services. Almost always it is a better
+                                choice to add explicit ordering
+                                directives via
+                                <varname>After=</varname> or
+                                <varname>Before=</varname>,
+                                instead. For more details see
+                                <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>. If
+                                used, pass an integer value in the
+                                same range as
+                                <filename>/etc/fstab</filename>'s
+                                fs_passno column. See
+                                <citerefentry><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+                                for details.</para></listitem>
+                        </varlistentry>
+

                 </variablelist>
         </refsect1>
 
         <refsect1>
                   <title>See Also</title>
                   <para>
                 </variablelist>
         </refsect1>
 
         <refsect1>
                   <title>See Also</title>
                   <para>

-                          <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+                          <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,

                           <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
                           <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
                           <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>
                           <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
                           <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
                           <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>