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+Copyright 2010 Lennart Poettering
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+Lesser General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
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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 service 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 service 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>--version</option></term>
-
- <listitem><para>Prints a short version
- string 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 and truncate unit descriptions
- 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>is-active</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>--user</option></term>
-
- <listitem><para>Talk to the systemd
- 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 user configuration
- directory, thus enabling or disabling
- a unit file globally for all future
- logins 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>--no-ask-password</option></term>
-
- <listitem><para>When used with
- <command>start</command> and related
- commands, disables asking for
- passwords. Background services may
- require input of a password or
- passphrase string, for example to
- unlock system hard disks or
- cryptographic certificates. Unless
- this option is specified and the
- command is invoked from a terminal
- <command>systemctl</command> will
- query the user on the terminal for the
- necessary secrets. Use this option to
- switch this behavior off. In this
- case the password must be supplied by
- some other means (for example
- graphical password agents) or the
- service might fail.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><option>--kill-mode=</option></term>
-
- <listitem><para>When used with
- <command>kill</command>, choose the
- mode how to kill the selected
- processes. Must be one of
- <option>control-group</option>,
- <option>process-group</option> or
- <option>process</option> to select
- whether to kill the entire control
- group, the process group or only the
- selected process itself. If omitted
- defaults to
- <option>control-group</option> if
- <option>--kill-who=all</option> is
- set, or <option>process</option>
- otherwise. You probably never need to
- use this switch.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><option>--kill-who=</option></term>
-
- <listitem><para>When used with
- <command>kill</command>, choose which
- processes to kill. Must be one of
- <option>main</option>,
- <option>control</option> or
- <option>all</option> to select whether
- to kill only the main process of the
- unit, the control process or all
- processes of the unit. If omitted
- defaults to
- <option>all</option>.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><option>--signal=</option></term>
- <term><option>-s</option></term>
-
- <listitem><para>When used with
- <command>kill</command>, choose which
- signal to send to selected
- processes. Must be one of the well
- known signal specifiers such as
- SIGTERM, SIGINT or SIGSTOP. If
- omitted defaults to
- <option>SIGTERM</option>.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><option>--force</option></term>
- <term><option>-f</option></term>
-
- <listitem><para>When used with
- <command>enable</command>, override any
- existing conflicting
- symlinks.</para></listitem>
-
- <listitem><para>When used with
- <command>halt</command>,
- <command>poweroff</command>,
- <command>reboot</command> or
- <command>kexec</command> execute
- selected operation without shutting
- down all units. However, all processes
- will be killed forcibly and all file
- systems are unmounted or remounted
- read-only. This is hence a drastic but
- relatively safe option to request an
- immediate reboot.</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>
-
- <para>This is similar to changing the
- runlevel in a traditional init system. The
- <command>isolate</command> command will
- immediately stop processes that are not
- enabled in the new unit, possibly including
- the graphical environment or terminal you
- are currently using.</para>
-
- <para>Note that this works only on units
- where <option>AllowIsolate=</option> is
- enabled. See
- <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for details.</para></listitem>
- </varlistentry>
- <varlistentry>
- <term><command>kill [NAME...]</command></term>
-
- <listitem><para>Send a signal to one
- or more processes of the unit. Use
- <option>--kill-who=</option> to select
- which process to kill. Use
- <option>--kill-mode=</option> to
- select the kill mode and
- <option>--signal=</option> to select
- the signal to send.</para></listitem>
- </varlistentry>
- <varlistentry>
- <term><command>is-active [NAME...]</command></term>
-
- <listitem><para>Check whether any of
- the specified units are 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...|PID...]</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. If a PID is passed
- information about the unit the process
- of the PID belongs to is
- shown.</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-failed [NAME...]</command></term>
-
- <listitem><para>Reset the
- '<literal>failed</literal>' 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 the
- '<literal>failed</literal>' state and
- its exit code 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
- separate <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 particularly 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>--user</option> or
- <option>--global</option> is specified
- this enables the unit for the system,
- for the calling user only
- or for all future logins 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 honors
- <option>--system</option>,
- <option>--user</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 no job id is specified, cancel all pending jobs.</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 a 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>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>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>
- <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. If
- combined with <option>--force</option>
- shutdown of all running services is
- skipped, however all processes are killed
- and all file systems are unmounted or
- mounted read-only, immediately
- followed by the
- system halt.</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. If
- combined with <option>--force</option>
- shutdown of all running services is
- skipped, however all processes are killed
- and all file systems are unmounted or
- mounted read-only, immediately
- followed by the
- powering off.</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. If
- combined with <option>--force</option>
- shutdown of all running services is
- skipped, however all processes are killed
- and all file systems are unmounted or
- mounted read-only, immediately
- followed by the
- reboot.</para></listitem>
- </varlistentry>
- <varlistentry>
- <term><command>kexec</command></term>
-
- <listitem><para>Shut down and reboot
- the system via kexec. This is mostly
- equivalent to <command>start
- kexec.target</command> but also prints
- a wall message to all users. If
- combined with <option>--force</option>
- shutdown of all running services is
- skipped, however all processes are killed
- and all file systems are unmounted or
- mounted read-only, immediately
- followed by the
- reboot.</para></listitem>
- </varlistentry>
- <varlistentry>
- <term><command>exit</command></term>
-
- <listitem><para>Ask the systemd
- manager to quit. This is only
- supported for user service managers
- (i.e. in conjunction with the
- <option>--user</option> option) and
- will fail otherwise.</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>
+ <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 service manager</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <cmdsynopsis>
+ <command>systemctl</command>
+ <arg choice="opt" rep="repeat">OPTIONS</arg>
+ <arg choice="plain">COMMAND</arg>
+ <arg choice="opt" rep="repeat">NAME</arg>
+ </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 service manager.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Options</title>
+
+ <para>The following options are understood:</para>
+
+ <variablelist>
+ <varlistentry>
+ <term><option>-h</option></term>
+ <term><option>--help</option></term>
+
+ <listitem><para>Prints a short help
+ text and exits.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--version</option></term>
+
+ <listitem>
+ <para>Prints a short version string and exits.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>-t</option></term>
+ <term><option>--type=</option></term>
+
+ <listitem>
+ <para>The argument should be a comma-separated list of unit
+ types such as <option>service</option> and
+ <option>socket</option>.
+ </para>
+
+ <para>If one of the arguments is a unit type, when listing
+ units, limit display to certain unit types. Otherwise, units
+ of all types will be shown.</para>
+
+ <para>As a special case, if one of the arguments is
+ <option>help</option>, a list of allowed values will be
+ printed and the program will exit.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--state=</option></term>
+
+ <listitem>
+ <para>Argument should be a comma-separated list of unit LOAD
+ or SUB or ACTIVE states. When listing units show only those
+ with specified LOAD or SUB or ACTIVE state.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>-p</option></term>
+ <term><option>--property=</option></term>
+
+ <listitem>
+ <para>When showing unit/job/manager properties with the
+ <command>show</command> command, limit display to certain
+ properties as specified as argument. If not specified, all
+ set properties are shown. The argument should be a
+ comma-separated list of property names, such as
+ <literal>MainPID</literal>. If specified more than once, all
+ properties with the specified names are shown.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>-a</option></term>
+ <term><option>--all</option></term>
+
+ <listitem>
+ <para>When listing units, show all loaded units, regardless
+ of their state, including inactive units. When showing
+ unit/job/manager properties, show all properties regardless
+ whether they are set or not.</para>
+ <para>To list all units installed on the system, use the
+ <command>list-unit-files</command> command instead.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--reverse</option></term>
+
+ <listitem>
+ <para>Show reverse dependencies between units with
+ <command>list-dependencies</command>, i.e. units with
+ dependencies of type <varname>Wants=</varname> or
+ <varname>Requires=</varname> on the given unit.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--after</option></term>
+ <term><option>--before</option></term>
+
+ <listitem>
+ <para>Show which units are started after or before
+ with <command>list-dependencies</command>, respectively.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>-l</option></term>
+ <term><option>--full</option></term>
+
+ <listitem>
+ <para>Do not ellipsize unit names, cgroup members, and
+ truncate unit descriptions 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. Do not confuse with
+ <option>--failed</option>.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--show-types</option></term>
+
+ <listitem>
+ <para>When showing sockets, show the type of the socket.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--irreversible</option></term>
+
+ <listitem>
+ <para>Mark this transaction's jobs as irreversible. This prevents
+ future conflicting transactions from replacing these jobs.
+ The jobs can still be cancelled using the <command>cancel</command>
+ command.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--ignore-dependencies</option></term>
+
+ <listitem>
+ <para>When enqueuing a new job, ignore all its dependencies
+ and execute it immediately. If passed, no required units of
+ the unit passed will be pulled in, and no ordering
+ dependencies will be honored. This is mostly a debugging and
+ rescue tool for the administrator and should not be used by
+ applications.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>-i</option></term>
+ <term><option>--ignore-inhibitors</option></term>
+
+ <listitem>
+ <para>When system shutdown or a sleep state is requested,
+ ignore inhibitor locks. Applications can establish inhibitor
+ locks to avoid that certain important operations (such as CD
+ burning or suchlike) are interrupted by system shutdown or a
+ sleep state. Any user may take these locks and privileged
+ users may override these locks. If any locks are taken,
+ shutdown and sleep state requests will normally fail
+ (regardless if privileged or not) and a list of active locks
+ is printed. However, if <option>--ignore-inhibitors</option>
+ is specified, the locks are ignored and not printed, and the
+ operation attempted anyway, possibly requiring additional
+ privileges.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>-q</option></term>
+ <term><option>--quiet</option></term>
+
+ <listitem>
+ <para>Suppress output to standard output in
+ <command>snapshot</command>,
+ <command>is-active</command>,
+ <command>is-failed</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>--no-legend</option></term>
+
+ <listitem>
+ <para>Do not print a legend, i.e. the column headers and
+ the footer with hints.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--no-pager</option></term>
+
+ <listitem>
+ <para>Do not pipe output into a pager.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--system</option></term>
+
+ <listitem>
+ <para>Talk to the systemd system manager. (Default)</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--user</option></term>
+
+ <listitem>
+ <para>Talk to the systemd manager of the calling
+ user.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--no-wall</option></term>
+
+ <listitem>
+ <para>Do not 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 user
+ configuration directory, thus enabling or disabling a unit
+ file globally for all future logins 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>--no-ask-password</option></term>
+
+ <listitem>
+ <para>When used with <command>start</command> and related
+ commands, disables asking for passwords. Background services
+ may require input of a password or passphrase string, for
+ example to unlock system hard disks or cryptographic
+ certificates. Unless this option is specified and the
+ command is invoked from a terminal,
+ <command>systemctl</command> will query the user on the
+ terminal for the necessary secrets. Use this option to
+ switch this behavior off. In this case, the password must be
+ supplied by some other means (for example graphical password
+ agents) or the service might fail. This also disables
+ querying the user for authentication for privileged
+ operations.</para>
+ </listitem>
+
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--kill-who=</option></term>
+
+ <listitem>
+ <para>When used with <command>kill</command>, choose which
+ processes to kill. Must be one of <option>main</option>,
+ <option>control</option> or <option>all</option> to select
+ whether to kill only the main process of the unit, the
+ control process or all processes of the unit. If omitted,
+ defaults to <option>all</option>.</para>
+ </listitem>
+
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>-s</option></term>
+ <term><option>--signal=</option></term>
+
+ <listitem>
+ <para>When used with <command>kill</command>, choose which
+ signal to send to selected processes. Must be one of the
+ well known signal specifiers such as <constant>SIGTERM</constant>, <constant>SIGINT</constant> or
+ <constant>SIGSTOP</constant>. If omitted, defaults to
+ <option>SIGTERM</option>.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>-f</option></term>
+ <term><option>--force</option></term>
+
+ <listitem>
+ <para>When used with <command>enable</command>, overwrite
+ any existing conflicting symlinks.</para>
+
+ <para>When used with <command>halt</command>,
+ <command>poweroff</command>, <command>reboot</command> or
+ <command>kexec</command>, execute the selected operation
+ without shutting down all units. However, all processes will
+ be killed forcibly and all file systems are unmounted or
+ remounted read-only. This is hence a drastic but relatively
+ safe option to request an immediate reboot. If
+ <option>--force</option> is specified twice for these
+ operations, they will be executed immediately without
+ terminating any processes or umounting any file
+ systems. Warning: specifying <option>--force</option> twice
+ with any of these operations might result in data
+ loss.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--root=</option></term>
+
+ <listitem>
+ <para>When used with
+ <command>enable</command>/<command>disable</command>/<command>is-enabled</command>
+ (and related commands), use alternative root path when
+ looking for unit files.</para>
+ </listitem>
+
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--runtime</option></term>
+
+ <listitem>
+ <para>When used with <command>enable</command>,
+ <command>disable</command>, <command>is-enabled</command>
+ (and related commands), make changes only temporarily, so
+ that they are lost on the next reboot. This will have the
+ effect that changes are not made in subdirectories of
+ <filename>/etc</filename> but in <filename>/run</filename>,
+ with identical immediate effects, however, since the latter
+ is lost on reboot, the changes are lost too.</para>
+
+ <para>Similar, when used with
+ <command>set-cgroup-attr</command>,
+ <command>unset-cgroup-attr</command>,
+ <command>set-cgroup</command> and
+ <command>unset-cgroup</command>, make changes only
+ temporarily, so that they are lost on the next
+ reboot.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>-H</option></term>
+ <term><option>--host</option></term>
+
+ <listitem>
+ <para>Execute operation remotely. Specify a hostname, or
+ username and hostname separated by <literal>@</literal>, to connect to. This
+ will use SSH to talk to the remote systemd
+ instance.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>-P</option></term>
+ <term><option>--privileged</option></term>
+
+ <listitem>
+ <para>Acquire privileges via PolicyKit before executing the
+ operation.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>-n</option></term>
+ <term><option>--lines=</option></term>
+
+ <listitem>
+ <para>When used with <command>status</command>, controls the
+ number of journal lines to show, counting from the most
+ recent ones. Takes a positive integer argument. Defaults to
+ 10.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>-o</option></term>
+ <term><option>--output=</option></term>
+
+ <listitem>
+ <para>When used with <command>status</command>, controls the
+ formatting of the journal entries that are shown. For the
+ available choices, see
+ <citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
+ Defaults to <literal>short</literal>.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--plain</option></term>
+
+ <listitem>
+ <para>When used with <command>list-dependencies</command>,
+ the output is printed as a list instead of a tree.</para>
+ </listitem>
+ </varlistentry>
+
+ </variablelist>
+ </refsect1>
+
+ <refsect1>
+ <title>Commands</title>
+
+ <para>The following commands are understood:</para>
+
+ <variablelist>
+ <varlistentry>
+ <term><command>list-units</command></term>
+
+ <listitem>
+ <para>List known units (subject to limitations specified
+ with <option>-t</option>).</para>
+
+ <para>This is the default command.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>list-sockets</command></term>
+
+ <listitem>
+ <para>List socket units ordered by the listening address. Produces output
+ similar to
+ <programlisting>
+LISTEN UNIT ACTIVATES
+/dev/initctl systemd-initctl.socket systemd-initctl.service
+...
+[::]:22 sshd.socket sshd.service
+kobject-uevent 1 systemd-udevd-kernel.socket systemd-udevd.service
+
+5 sockets listed.
+ </programlisting>
+ Note: because the addresses might contains spaces, this output
+ is not suitable for programmatic consumption.
+ </para>
+
+ <para>See also the options <option>--show-types</option>,
+ <option>--all</option>, and <option>--failed</option>.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>set-log-level <replaceable>LEVEL</replaceable></command></term>
+
+ <listitem>
+ <para>Change current log level of the
+ <command>systemd</command> daemon to
+ <replaceable>LEVEL</replaceable> (accepts the same values
+ as <option>--log-level=</option> described in
+ <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>).
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>start <replaceable>NAME</replaceable>...</command></term>
+
+ <listitem>
+ <para>Start (activate) one or more units specified on the
+ command line.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><command>stop <replaceable>NAME</replaceable>...</command></term>
+
+ <listitem>
+ <para>Stop (deactivate) one or more units specified on the
+ command line.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><command>reload <replaceable>NAME</replaceable>...</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 <replaceable>NAME</replaceable>...</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 <replaceable>NAME</replaceable>...</command></term>
+
+ <listitem>
+ <para>Restart one or more units specified on the command
+ line if the units are running. This does nothing if units are not
+ running. Note that, for compatibility with Red Hat init
+ scripts, <command>condrestart</command> is equivalent to this
+ command.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><command>reload-or-restart <replaceable>NAME</replaceable>...</command></term>
+
+ <listitem>
+ <para>Reload one or more units if they support it. If not,
+ restart them instead. If the units are not running yet, they
+ will be started.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><command>reload-or-try-restart <replaceable>NAME</replaceable>...</command></term>
+
+ <listitem>
+ <para>Reload one or more units if they support it. If not,
+ restart them instead. This does nothing if the units are not
+ running. Note that, for compatibility with SysV init scripts,
+ <command>force-reload</command> is equivalent to this
+ command.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><command>isolate <replaceable>NAME</replaceable></command></term>
+
+ <listitem>
+ <para>Start the unit specified on the command line and its
+ dependencies and stop all others.</para>
+
+ <para>This is similar to changing the runlevel in a
+ traditional init system. The <command>isolate</command>
+ command will immediately stop processes that are not enabled
+ in the new unit, possibly including the graphical
+ environment or terminal you are currently using.</para>
+
+ <para>Note that this is allowed only on units where
+ <option>AllowIsolate=</option> is enabled. See
+ <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for details.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><command>kill <replaceable>NAME</replaceable>...</command></term>
+
+ <listitem>
+ <para>Send a signal to one or more processes of the
+ unit. Use <option>--kill-who=</option> to select which
+ process to kill. Use <option>--kill-mode=</option> to select
+ the kill mode and <option>--signal=</option> to select the
+ signal to send.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><command>is-active <replaceable>NAME</replaceable>...</command></term>
+
+ <listitem>
+ <para>Check whether any of the specified units are 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>is-failed <replaceable>NAME</replaceable>...</command></term>
+
+ <listitem>
+ <para>Check whether any of the specified units are in a "failed" state.
+ Returns an exit code 0 if at least one has failed, 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 [<replaceable>NAME</replaceable>...|<replaceable>PID</replaceable>...]</command></term>
+
+ <listitem>
+ <para>Show terse runtime status information about one or
+ more units, followed by most recent log data from the
+ journal. If no units are specified, show all units (subject
+ to limitations specified with <option>-t</option>). If a PID
+ is passed, show information about the unit the process
+ belongs to.</para>
+
+ <para>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 [<replaceable>NAME</replaceable>...|<replaceable>JOB</replaceable>...]</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>get-cgroup-attr <replaceable>NAME</replaceable> <replaceable>ATTRIBUTE</replaceable>...</command></term>
+
+ <listitem>
+ <para>Retrieve the specified control group attributes of the
+ specified unit. Takes a unit name and one or more attribute
+ names such as <literal>cpu.shares</literal>. This will
+ output the current values of the specified attributes,
+ separated by new-lines. For attributes that take a list of
+ items, the output will be newline-separated, too. This
+ operation will always try to retrieve the data in question
+ from the kernel first, and if that is not available, use the
+ configured values instead. Instead of low-level control
+ group attribute names, high-level pretty names may be used,
+ as used for unit execution environment configuration, see
+ <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for details. For example, passing
+ <literal>memory.limit_in_bytes</literal> and
+ <literal>MemoryLimit</literal> is equivalent.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>set-cgroup-attr <replaceable>NAME</replaceable> <replaceable>ATTRIBUTE</replaceable> <replaceable>VALUE</replaceable>...</command></term>
+
+ <listitem>
+ <para>Set the specified control group attribute of the
+ specified unit to the specified value. Takes a unit
+ name and an attribute name such as
+ <literal>cpu.shares</literal>, plus one or more values
+ (multiple values may only be used for attributes that take
+ multiple values). This operation will immediately update the
+ kernel attribute for this unit and persistently store this
+ setting for later reboots (unless <option>--runtime</option>
+ is passed, in which case the setting is not saved
+ persistently and only valid until the next reboot.) Instead
+ of low-level control group attribute names, high-level pretty
+ names may be used, as used for unit execution environment
+ configuration, see
+ <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for details. For example, passing
+ <literal>memory.limit_in_bytes</literal> and
+ <literal>MemoryLimit</literal> is equivalent. This operation
+ will implicitly create a control group for the unit in the
+ controller the attribute belongs to, if needed. For
+ attributes that take multiple values, this operation will
+ append the specified values to the previously set values
+ list (use <command>unset-cgroup-attr</command> to reset the
+ list explicitly). For attributes that take a single value
+ only, the list will be reset implicitly.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>unset-cgroup-attr <replaceable>NAME</replaceable> <replaceable>ATTRIBUTE</replaceable>...</command></term>
+
+ <listitem><para>Unset the specified control group attributes
+ of the specified unit. Takes a unit name and one or more
+ attribut names such as <literal>cpu.shares</literal>. This
+ operation might or might not have an immediate effect on the
+ current kernel attribute value. This will remove any
+ persistently stored configuration values for this attribute
+ (as set with <command>set-cgroup-attr</command> before),
+ unless <option>--runtime</option> is passed, in which case the
+ configuration is reset only until the next reboot. Again,
+ high-level control group attributes may be used instead of the
+ low-level kernel ones. For attributes which take multiple
+ values, all currently set values are reset.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>set-cgroup <replaceable>NAME</replaceable> <replaceable>CGROUP</replaceable>...</command></term>
+ <term><command>unset-cgroup <replaceable>NAME</replaceable> <replaceable>CGROUP</replaceable>...</command></term>
+
+ <listitem><para>Add or remove a unit to/from a specific
+ control group hierarchy and/or control group path. Takes a
+ unit name, plus a control group specification in the syntax
+ <replaceable>CONTROLLER</replaceable>:<replaceable>PATH</replaceable>
+ or <replaceable>CONTROLLER</replaceable>. In the latter syntax
+ (where the path is omitted), the default unit control group
+ path is implied. Examples: <literal>cpu</literal> or
+ <literal>cpu:/foo/bar</literal>. If a unit is removed from a
+ control group hierarchy, all its processes will be moved to the
+ root group of the hierarchy and all control group attributes
+ will be reset. These operations are immediately reflected in
+ the kernel hierarchy, and stored persistently to disk (unless
+ <option>--runtime</option> is passed).</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>help <replaceable>NAME</replaceable>...|<replaceable>PID</replaceable>...</command></term>
+
+ <listitem>
+ <para>Show manual pages for one or more units, if
+ available. If a PID is given, the manual pages for the unit
+ the process belongs to are shown.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>reset-failed [<replaceable>NAME</replaceable>...]</command></term>
+
+ <listitem>
+ <para>Reset the <literal>failed</literal> state of the
+ specified units, or if no unit name is passed, reset the state 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 the
+ <literal>failed</literal> state and its exit code 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>list-unit-files</command></term>
+
+ <listitem>
+ <para>List installed unit files.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>enable <replaceable>NAME</replaceable>...</command></term>
+
+ <listitem>
+ <para>Enable one or more unit files or unit file instances,
+ 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 <emphasis>not</emphasis> have the effect of also
+ starting any of the units being enabled. If this
+ is desired, a separate <command>start</command> command must
+ be invoked for the unit. Also note that in case of instance
+ enablement, symlinks named the same as instances are created in
+ the install location, however they all point to the same
+ template unit file.</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 particularly 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 the 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>--user</option> or <option>--global</option> is
+ specified, this enables the unit for the system, for the
+ calling user only or for all future logins of all
+ users. Note that in the last case, no systemd daemon
+ configuration is reloaded.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>disable <replaceable>NAME</replaceable>...</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 removes
+ all symlinks to the unit files (i.e. including manual
+ additions), not just those actually created by
+ <command>enable</command>. This call implicitly reloads the
+ systemd daemon configuration after completing the disabling
+ of the units. Note that this command does not implicitly
+ stop the units that are 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>
+
+ <para>This command honors <option>--system</option>,
+ <option>--user</option>, <option>--global</option> in a
+ similar way as <command>enable</command>.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>is-enabled <replaceable>NAME</replaceable>...</command></term>
+
+ <listitem>
+ <para>Checks whether any of the specified unit files are
+ enabled (as with <command>enable</command>). Returns an exit
+ code of 0 if at least one is enabled, non-zero
+ otherwise. Prints the current enable status. To suppress
+ this output, use <option>--quiet</option>.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>reenable <replaceable>NAME</replaceable>...</command></term>
+
+ <listitem>
+ <para>Reenable one or more unit files, as specified on the
+ command line. This is a combination of
+ <command>disable</command> and <command>enable</command> and
+ is useful to reset the symlinks a unit is enabled with to
+ the defaults configured in the <literal>[Install]</literal>
+ section of the unit file.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>preset <replaceable>NAME</replaceable>...</command></term>
+
+ <listitem>
+ <para>Reset one or more unit files, as specified on the
+ command line, to the defaults configured in the preset
+ policy files. This has the same effect as
+ <command>disable</command> or <command>enable</command>,
+ depending how the unit is listed in the preset files. For
+ more information on the preset policy format, see
+ <citerefentry><refentrytitle>systemd.preset</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
+ For more information on the concept of presets, please
+ consult the
+ <ulink url="http://freedesktop.org/wiki/Software/systemd/Preset">Preset</ulink>
+ document.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>mask <replaceable>NAME</replaceable>...</command></term>
+
+ <listitem>
+ <para>Mask one or more unit files, as specified on the
+ command line. This will link these units to
+ <filename>/dev/null</filename>, making it impossible to
+ start them. This is a stronger version of
+ <command>disable</command>, since it prohibits all kinds of
+ activation of the unit, including manual activation. Use
+ this option with care.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>unmask <replaceable>NAME</replaceable>...</command></term>
+
+ <listitem>
+ <para>Unmask one or more unit files, as specified on the
+ command line. This will undo the effect of
+ <command>mask</command>.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>link <replaceable>FILENAME</replaceable>...</command></term>
+
+ <listitem>
+ <para>Link a unit file that is not in the unit file search
+ paths into the unit file search path. This requires an
+ absolute path to a unit file. The effect of this can be
+ undone with <command>disable</command>. The effect of this
+ command is that a unit file is available for
+ <command>start</command> and other commands although it
+ is not installed directly in the unit search path.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>get-default</command></term>
+
+ <listitem>
+ <para>Get the default target specified
+ via <filename>default.target</filename> link.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>set-default <replaceable>NAME</replaceable></command></term>
+
+ <listitem>
+ <para>Set the default target to boot into. Command links
+ <filename>default.target</filename> to the given unit.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>load <replaceable>NAME</replaceable>...</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>.</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 <replaceable>JOB</replaceable>...</command></term>
+
+ <listitem>
+ <para>Cancel one or more jobs specified on the command line
+ by their numeric job IDs. If no job ID is specified, cancel
+ all pending jobs.</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>list-dependencies <replaceable>NAME</replaceable></command></term>
+
+ <listitem>
+ <para>Shows required and wanted units of the specified
+ unit. If no unit is specified,
+ <filename>default.target</filename> is implied. Target units
+ are recursively expanded. When <option>--all</option> is
+ passed, all other units are recursively expanded as
+ well.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><command>snapshot [<replaceable>NAME</replaceable>]</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 a 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>
+
+ <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>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><command>delete <replaceable>NAME</replaceable>...</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 listening
+ on behalf of user configuration will stay accessible.
+ </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 <replaceable>VARIABLE=VALUE</replaceable>...</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 <replaceable>VARIABLE</replaceable>...</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>default</command></term>
+
+ <listitem>
+ <para>Enter default mode. This is mostly equivalent to
+ <command>isolate 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>
+ <varlistentry>
+ <term><command>halt</command></term>
+
+ <listitem>
+ <para>Shut down and halt the system. This is mostly equivalent to
+ <command>start halt.target --irreversible</command>, but also
+ prints a wall message to all users. If combined with
+ <option>--force</option>, shutdown of all running services is
+ skipped, however all processes are killed and all file
+ systems are unmounted or mounted read-only, immediately
+ followed by the system halt. If <option>--force</option> is
+ specified twice, the operation is immediately executed
+ without terminating any processes or unmounting any file
+ systems. This may result in data loss.</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 --irreversible</command>,
+ but also prints a wall message to all users. If combined with
+ <option>--force</option>, shutdown of all running services is
+ skipped, however all processes are killed and all file
+ systems are unmounted or mounted read-only, immediately
+ followed by the powering off. If <option>--force</option> is
+ specified twice, the operation is immediately executed
+ without terminating any processes or unmounting any file
+ systems. This may result in data loss.</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 --irreversible</command>,
+ but also prints a wall message to all users. If combined with
+ <option>--force</option>, shutdown of all running services is
+ skipped, however all processes are killed and all file
+ systems are unmounted or mounted read-only, immediately
+ followed by the reboot. If <option>--force</option> is
+ specified twice, the operation is immediately executed
+ without terminating any processes or unmounting any file
+ systems. This may result in data loss.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><command>kexec</command></term>
+
+ <listitem>
+ <para>Shut down and reboot the system via kexec. This is
+ mostly equivalent to <command>start kexec.target --irreversible</command>,
+ but also prints a wall message to all users. If combined
+ with <option>--force</option>, shutdown of all running
+ services is skipped, however all processes are killed and
+ all file systems are unmounted or mounted read-only,
+ immediately followed by the reboot.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><command>exit</command></term>
+
+ <listitem>
+ <para>Ask the systemd manager to quit. This is only
+ supported for user service managers (i.e. in conjunction
+ with the <option>--user</option> option) and will fail
+ otherwise.</para>
+ </listitem>
+
+ </varlistentry>
+ <varlistentry>
+ <term><command>suspend</command></term>
+
+ <listitem>
+ <para>Suspend the system. This will trigger activation of
+ the special <filename>suspend.target</filename> target.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><command>hibernate</command></term>
+
+ <listitem>
+ <para>Hibernate the system. This will trigger activation of
+ the special <filename>hibernate.target</filename> target.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><command>hybrid-sleep</command></term>
+
+ <listitem>
+ <para>Hibernate and suspend the system. This will trigger
+ activation of the special
+ <filename>hybrid-sleep.target</filename> target.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><command>switch-root <replaceable>ROOT</replaceable> [<replaceable>INIT</replaceable>]</command></term>
+
+ <listitem>
+ <para>Switches to a different root directory and executes a
+ new system manager process below it. This is intended for
+ usage in initial RAM disks ("initrd"), and will transition
+ from the initrd's system manager process (a.k.a "init"
+ process) to the main system manager process. This call takes two
+ arguments: the directory that is to become the new root directory, and
+ the path to the new system manager binary below it to
+ execute as PID 1. If the latter is omitted or the empty
+ string, a systemd binary will automatically be searched for
+ and used as init. If the system manager path is omitted or
+ equal to the empty string, the state of the initrd's system
+ manager process is passed to the main system manager, which
+ allows later introspection of the state of the services
+ involved in the initrd boot.</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>Environment</title>
+
+ <variablelist class='environment-variables'>
+ <varlistentry>
+ <term><varname>$SYSTEMD_PAGER</varname></term>
+
+ <listitem>
+ <para>Pager to use when <option>--no-pager</option> is not
+ given; overrides <varname>$PAGER</varname>. Setting this to
+ an empty string or the value <literal>cat</literal> is
+ equivalent to passing
+ <option>--no-pager</option>.</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </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>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>loginctl</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>,
+ <citerefentry><refentrytitle>systemd.preset</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ </para>
+ </refsect1>
</refentry>
~ianmdlvl / elogind.git / blobdiff