path: root/man/systemctl.xml

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<refentry id="systemctl">

        <refentryinfo>
                <title>systemctl</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>systemctl</refentrytitle>
                <manvolnum>1</manvolnum>
        </refmeta>

        <refnamediv>
                <refname>systemctl</refname>
                <refpurpose>Control the systemd system and session manager</refpurpose>
        </refnamediv>

        <refsynopsisdiv>
                <cmdsynopsis>
                        <command>systemctl <arg choice="opt" rep="repeat">OPTIONS</arg> <arg choice="req">COMMAND</arg> <arg choice="opt" rep="repeat">NAME</arg></command>
                </cmdsynopsis>
        </refsynopsisdiv>

        <refsect1>
                <title>Description</title>

                <para><command>systemctl</command> may be used to
                introspect and control the state of the
                <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
                system and session manager.</para>
        </refsect1>

        <refsect1>
                <title>Options</title>

                <para>The following options are understood:</para>

                <variablelist>
                        <varlistentry>
                                <term><option>--help</option></term>
                                <term><option>-h</option></term>

                                <listitem><para>Prints a short help
                                text and exits.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>--type=</option></term>
                                <term><option>-t</option></term>

                                <listitem><para>When listing units,
                                limit display to certain unit
                                types. If not specified units of all
                                types will be shown. The argument
                                should be a unit type name such as
                                <option>service</option>,
                                <option>socket</option> and
                                similar.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>--property=</option></term>
                                <term><option>-p</option></term>

                                <listitem><para>When showing
                                unit/job/manager information, limit
                                display to certain properties as
                                specified as argument. If not
                                specified all set properties are
                                shown. The argument should be a
                                property name, such as
                                <literal>MainPID</literal>. If
                                specified more than once all
                                properties with the specified names
                                are shown.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>--all</option></term>
                                <term><option>-a</option></term>

                                <listitem><para>When listing units,
                                show all units, regardless of their
                                state, including inactive units. When
                                showing unit/job/manager information,
                                show all properties regardless whether
                                they are set or not.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>--full</option></term>

                                <listitem><para>Do not ellipsize unit
                                names in the output of
                                <command>list-units</command> and
                                <command>list-jobs</command>.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>--fail</option></term>

                                <listitem><para>If the requested
                                operation conflicts with a pending
                                unfinished job, fail the command. If
                                this is not specified the requested
                                operation will replace the pending job,
                                if necessary.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>--quiet</option></term>
                                <term><option>-q</option></term>

                                <listitem><para>Suppress output to
                                STDOUT in
                                <command>snapshot</command>,
                                <command>check</command>,
                                <command>enable</command> and
                                <command>disable</command>.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>--no-block</option></term>

				<listitem><para>Do not synchronously wait for
				the requested operation to finish. If this is
				not specified the job will be verified,
				enqueued and <command>systemctl</command> will
				wait until it is completed. By passing this
				argument it is only verified and
				enqueued.</para></listitem> </varlistentry>

                        <varlistentry>
                                <term><option>--system</option></term>

                                <listitem><para>Talk to the systemd
                                system manager. (Default)</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>--session</option></term>

                                <listitem><para>Talk to the systemd
                                session manager of the calling user.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>--order</option></term>
                                <term><option>--require</option></term>

                                <listitem><para>When used in
                                conjunction with the
                                <command>dot</command> command (see
                                below), selects which dependencies are
                                shown in the dependency graph. If
                                <option>--order</option> is passed
                                only dependencies of type
                                <varname>After=</varname> or
                                <varname>Before=</varname> are
                                shown. If <option>--require</option>
                                is passed only dependencies of type
                                <varname>Requires=</varname>,
                                <varname>RequiresOverridable=</varname>,
                                <varname>Requisite=</varname>,
                                <varname>RequisiteOverridable=</varname>,
                                <varname>Wants=</varname> and
                                <varname>Conflicts=</varname> are
                                shown. If neither is passed, shows
                                dependencies of all these
                                types.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>--no-wall</option></term>

                                <listitem><para>Don't send wall
                                message before
                                halt, power-off, reboot.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>--global</option></term>

                                <listitem><para>When used with
                                <command>enable</command> and
                                <command>disable</command>, operate on the
                                global session configuŕation
                                directory, thus enabling or disabling
                                a unit file globally for all future
                                sessions of all users.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>--no-reload</option></term>

                                <listitem><para>When used with
                                <command>enable</command> and
                                <command>disable</command>, do not
                                implicitly reload daemon configuration
                                after executing the
                                changes.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>--force</option></term>

                                <listitem><para>When used with
                                <command>enable</command>, override any
                                existing conflicting
                                symlinks.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>--defaults</option></term>

                                <listitem><para>When used with
                                <command>disable</command>, ensures
                                that only the symlinks created by
                                <command>enable</command> are removed,
                                not all symlinks pointing to the unit
                                file that shall be
                                disabled.</para></listitem>
                        </varlistentry>
                </variablelist>

                <para>The following commands are understood:</para>

                <variablelist>
                        <varlistentry>
                                <term><command>list-units</command></term>

                                <listitem><para>List known units.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>start [NAME...]</command></term>

                                <listitem><para>Start (activate) one
                                or more units specified on the command
                                line.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>stop [NAME...]</command></term>

                                <listitem><para>Stop (deactivate) one
                                or more units specified on the command
                                line.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>reload [NAME...]</command></term>

                                <listitem><para>Asks all units listed
                                on the command line to reload their
                                configuration. Note that this will
                                reload the service-specific
                                configuration, not the unit
                                configuration file of systemd. If you
                                want systemd to reload the
                                configuration file of a unit use the
                                <command>daemon-reload</command>
                                command. In other words: for the
                                example case of Apache, this will
                                reload Apache's
                                <filename>httpd.conf</filename> in the
                                web server, not the
                                <filename>apache.service</filename>
                                systemd unit file. </para>

                                <para>This command should not be
                                confused with the
                                <command>daemon-reload</command> or
                                <command>load</command>
                                commands.</para></listitem>

                        </varlistentry>
                        <varlistentry>
                                <term><command>restart [NAME...]</command></term>

                                <listitem><para>Restart one or more
                                units specified on the command
                                line. If the units are not running yet
                                they will be
                                started.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>try-restart [NAME...]</command></term>

                                <listitem><para>Restart one or more
                                units specified on the command
                                line. If the units are not running yet
                                the operation will
                                fail.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>reload-or-restart [NAME...]</command></term>
                                <term><command>reload-or-try-restart [NAME...]</command></term>

                                <listitem><para>Reload one or more
                                units if they support it. If not,
                                restart them instead. Note that for
                                compatibility with SysV and Red Hat
                                init scripts
                                <command>force-reload</command> and
                                <command>condrestart</command> may be
                                used as equivalent commands to
                                <command>reload-or-try-restart</command>.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>isolate [NAME]</command></term>

                                <listitem><para>Start the unit
                                specified on the command line and its
                                dependencies and stop all
                                others.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>is-active [NAME...]</command></term>

                                <listitem><para>Check whether any of
                                the specified units is active
                                (i.e. running). Returns an exit code
                                0 if at least one is active, non-zero
                                otherwise. Unless
                                <option>--quiet</option> is specified
                                this will also print the current unit
                                state to STDOUT.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>status [NAME...]</command></term>

                                <listitem><para>Show terse runtime
                                status information about one or more
                                units. This function is intended to
                                generate human-readable output. If you
                                are looking for computer-parsable
                                output, use <command>show</command>
                                instead.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>show [NAME...|JOB...]</command></term>

                                <listitem><para>Show properties of one
                                or more units, jobs or the manager
                                itself. If no argument is specified
                                properties of the manager will be
                                shown. If a unit name is specified
                                properties of the unit is shown, and
                                if a job id is specified properties of
                                the job is shown. By default, empty
                                properties are suppressed. Use
                                <option>--all</option> to show those
                                too. To select specific properties to
                                show use
                                <option>--property=</option>. This
                                command is intended to be used
                                whenever computer-parsable output is
                                required. Use
                                <command>status</command> if you are
                                looking for formatted human-readable
                                output.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><command>reset-maintenance [NAME...]</command></term>

                                <listitem><para>Reset maintenance
                                state of the specified units, or if no
                                unit name is passed of all units. When
                                a unit fails in some way (i.e. process
                                exiting with non-zero error code,
                                terminating abnormally or timing out)
                                it will automatically enter
                                maintenance state and its exit codes
                                and status is recorded for
                                introspection by the administrator
                                until the service is restarted or
                                reset with this
                                command.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><command>enable [NAME...]</command></term>

                                <listitem><para>Enable one or more
                                unit files, as specified on the
                                command line. This will create a
                                number of symlinks as encoded in the
                                <literal>[Install]</literal> sections
                                of the unit files. After the symlinks
                                have been created the systemd
                                configuration is reloaded (in a way
                                that is equivalent to
                                <command>daemon-reload</command>) to
                                ensure the changes are taken into
                                account immediately. Note that this
                                does not have the effect that any of
                                the units enabled are also started at
                                the same time. If this is desired a
                                seperate <command>start</command>
                                command must be invoked for the
                                unit.</para>

                                <para>This command will
                                print the actions executed. This
                                output may be suppressed by passing
                                <option>--quiet</option>.</para>

                                <para>Note that this operation creates
                                only the suggested symlinks for the
                                units. While this command is the
                                recommended way to manipulate the unit
                                configuration directory, the
                                administrator is free to make
                                additional changes manually, by
                                placing or removing symlinks in the
                                directory. This is particular useful
                                to create configurations that deviate
                                from the suggested default
                                installation. In this case the
                                administrator must make sure to invoke
                                <command>daemon-reload</command>
                                manually as necessary, to ensure his
                                changes are taken into account.</para>

                                <para>Enabling units should not be
                                confused with starting (activating)
                                units, as done by the
                                <command>start</command>
                                command. Enabling and starting units
                                is orthogonal: units may be enabled
                                without being started and started
                                without being enabled. Enabling simply
                                hooks the unit into various suggested
                                places (for example, so that the unit
                                is automatically started on boot or
                                when a particular kind of hardware is
                                plugged in). Starting actually spawns
                                the daemon process (in case of service
                                units), or binds the socket (in case
                                of socket units), and so
                                on.</para>

                                <para>Depending on whether
                                <option>--system</option>,
                                <option>--session</option> or
                                <option>--global</option> is specified
                                this enables the unit for the system,
                                for sessions of the calling user only
                                or for all future session of all
                                users. Note that in the latter case no
                                systemd daemon configuration is
                                reloaded.</para>
                                </listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><command>disable [NAME...]</command></term>

                                <listitem><para>Disables one or more
                                units. This removes all symlinks to
                                the specified unit files from the unit
                                configuration directory, and hence
                                undoes the changes made by
                                <command>enable</command>. Note
                                however that this by default removes
                                all symlinks to the unit files
                                (i.e. including manual additions), not
                                just those actually created by
                                <command>enable</command>. If only the
                                symlinks that are suggested by default
                                shall be removed, pass
                                <option>--defaults</option>. This
                                implicitly reloads the systemd daemon
                                configuration after completing the
                                disabling of the units. Note that this
                                command does not implicitly stop the
                                units that is being disabled. If this
                                is desired an additional
                                <command>stop</command>command should
                                be executed afterwards.</para>

                                <para>This command will print the
                                actions executed. This output may be
                                suppressed by passing
                                <option>--quiet</option>.</para>
                                </listitem>

                                <para>This command honours
                                <option>--system</option>,
                                <option>--session</option>,
                                <option>--global</option> in a similar
                                way as
                                <command>enable</command>.</para>
                        </varlistentry>

                        <varlistentry>
                                <term><command>is-enabled [NAME...]</command></term>

                                <listitem><para>Checks whether any of
                                the specified unit files is enabled
                                (as with
                                <command>enable</command>). Returns an
                                exit code of 0 if at least one is
                                enabled, non-zero
                                otherwise.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><command>load [NAME...]</command></term>

                                <listitem><para>Load one or more units
                                specified on the command line. This
                                will simply load their configuration
                                from disk, but not start them. To
                                start them you need to use the
                                <command>start</command> command which
                                will implicitly load a unit that has
                                not been loaded yet. Note that systemd
                                garbage collects loaded units that are
                                not active or referenced by an active
                                unit. This means that units loaded
                                this way will usually not stay loaded
                                for long. Also note that this command
                                cannot be used to reload unit
                                configuration. Use the
                                <command>daemon-reload</command>
                                command for that. All in all, this
                                command is of little use except for
                                debugging.</para>
                                <para>This command should not be
                                confused with the
                                <command>daemon-reload</command> or
                                <command>reload</command>
                                commands.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>list-jobs</command></term>

                                <listitem><para>List jobs that are in progress.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>cancel [JOB...]</command></term>

                                <listitem><para>Cancel one or more
                                jobs specified on the command line by
                                their numeric job
                                IDs. If not job id is specified cancels all jobs that are pending.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>monitor</command></term>

                                <listitem><para>Monitor unit/job
                                changes. This is mostly useful for
                                debugging purposes and prints a line
                                each time systemd loads or unloads a
                                unit configuration file, or a unit
                                property changes.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>dump</command></term>

                                <listitem><para>Dump server
                                status. This will output a (usually
                                very long) human readable manager
                                status dump. Its format is subject to
                                change without notice and should not
                                be parsed by
                                applications.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>dot</command></term>

                                <listitem><para>Generate textual
                                dependency graph description in dot
                                format for further processing with the
                                GraphViz
                                <citerefentry><refentrytitle>dot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
                                tool. Use a command line like
                                <command>systemctl dot | dot -Tsvg >
                                systemd.svg</command> to generate a
                                graphical dependency tree. Unless
                                <option>--order</option> or
                                <option>--require</option> is passed
                                the generated graph will show both
                                ordering and requirement
                                dependencies.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>snapshot [NAME]</command></term>

                                <listitem><para>Create a snapshot. If
                                a snapshot name is specified, the new
                                snapshot will be named after it. If
                                none is specified an automatic
                                snapshot name is generated. In either
                                case, the snapshot name used is
                                printed to STDOUT, unless
                                <option>--quiet</option> is
                                specified.</para>

                                <para>A snapshot refers to a saved
                                state of the systemd manager. It is
                                implemented itself as unit that is
                                generated dynamically with this
                                command and has dependencies on all
                                units active at the time. At a later
                                time the user may return to this state
                                by using the
                                <command>isolate</command> command on
                                the snapshot unit.</para></listitem>

                                <para>Snapshots are only useful for
                                saving and restoring which units are
                                running or are stopped, they do not
                                save/restore any other
                                state. Snapshots are dynamic and lost
                                on reboot.</para>
                        </varlistentry>
                        <varlistentry>
                                <term><command>delete [NAME...]</command></term>

                                <listitem><para>Remove a snapshot
                                previously created with
                                <command>snapshot</command>.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>daemon-reload</command></term>

                                <listitem><para>Reload systemd manager
                                configuration. This will reload all
                                unit files and recreate the entire
                                dependency tree. While the daemon is
                                reloaded, all sockets systemd listens
                                on on behalf of user configuration will
                                stay accessible.</para> <para>This
                                command should not be confused with
                                the <command>load</command> or
                                <command>reload</command>
                                commands.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>daemon-reexec</command></term>

                                <listitem><para>Reexecute the systemd
                                manager. This will serialize the
                                manager state, reexecute the process
                                and deserialize the state again. This
                                command is of little use except for
                                debugging and package
                                upgrades. Sometimes it might be
                                helpful as a heavy-weight
                                <command>daemon-reload</command>. While
                                the daemon is reexecuted all sockets
                                systemd listens on on behalf of user
                                configuration will stay
                                accessible.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>daemon-exit</command></term>

                                <listitem><para>Ask the systemd
                                manager to quit. This is only
                                supported for session managers
                                (i.e. in conjunction with the
                                <option>--session</option> option) and
                                will fail otherwise.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>show-environment</command></term>

                                <listitem><para>Dump the systemd
                                manager environment block. The
                                environment block will be dumped in
                                straight-forward form suitable for
                                sourcing into a shell script. This
                                environment block will be passed to
                                all processes the manager
                                spawns.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>set-environment [NAME=VALUE...]</command></term>

                                <listitem><para>Set one or more
                                systemd manager environment variables,
                                as specified on the command
                                line.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>unset-environment [NAME...]</command></term>

                                <listitem><para>Unset one or more
                                systemd manager environment
                                variables. If only a variable name is
                                specified it will be removed
                                regardless of its value. If a variable
                                and a value are specified the variable
                                is only removed if it has the
                                specified value.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><command>halt</command></term>

                                <listitem><para>Shut down and halt the
                                system. This is mostly equivalent to
                                <command>start halt.target</command>
                                but also prints a wall message to all
                                users.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>poweroff</command></term>

                                <listitem><para>Shut down and
                                power-off the system. This is mostly
                                equivalent to <command>start
                                poweroff.target</command> but also
                                prints a wall message to all
                                users.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>reboot</command></term>

                                <listitem><para>Shut down and
                                reboot the system. This is mostly
                                equivalent to <command>start
                                reboot.target</command> but also
                                prints a wall message to all
                                users.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>default</command></term>

                                <listitem><para>Enter default
                                mode. This is mostly equivalent to
                                <command>start
                                default.target</command>.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>rescue</command></term>

                                <listitem><para>Enter rescue
                                mode. This is mostly equivalent to
                                <command>isolate
                                rescue.target</command> but also
                                prints a wall message to all
                                users.</para></listitem>
                        </varlistentry>
                        <varlistentry>
                                <term><command>emergency</command></term>

                                <listitem><para>Enter emergency
                                mode. This is mostly equivalent to
                                <command>isolate
                                emergency.target</command> but also
                                prints a wall message to all
                                users.</para></listitem>
                        </varlistentry>
                </variablelist>

        </refsect1>

        <refsect1>
                <title>Exit status</title>

                <para>On success 0 is returned, a non-zero failure
                code otherwise.</para>
        </refsect1>

        <refsect1>
                <title>See Also</title>
                <para>
                        <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
                        <citerefentry><refentrytitle>systemadm</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
                        <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
                        <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
                        <citerefentry><refentrytitle>wall</refentrytitle><manvolnum>1</manvolnum></citerefentry>
                </para>
        </refsect1>

</refentry>