1 <?xml version='1.0'?> <!--*-nxml-*-->
2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
3 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
6 This file is part of systemd.
8 Copyright 2010 Lennart Poettering
10 systemd is free software; you can redistribute it and/or modify it
11 under the terms of the GNU Lesser General Public License as published by
12 the Free Software Foundation; either version 2.1 of the License, or
13 (at your option) any later version.
15 systemd is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 Lesser General Public License for more details.
20 You should have received a copy of the GNU Lesser General Public License
21 along with systemd; If not, see <http://www.gnu.org/licenses/>.
24 <refentry id="systemctl"
25 xmlns:xi="http://www.w3.org/2001/XInclude">
28 <title>systemctl</title>
29 <productname>systemd</productname>
33 <contrib>Developer</contrib>
34 <firstname>Lennart</firstname>
35 <surname>Poettering</surname>
36 <email>lennart@poettering.net</email>
42 <refentrytitle>systemctl</refentrytitle>
43 <manvolnum>1</manvolnum>
47 <refname>systemctl</refname>
48 <refpurpose>Control the systemd system and service manager</refpurpose>
53 <command>systemctl</command>
54 <arg choice="opt" rep="repeat">OPTIONS</arg>
55 <arg choice="plain">COMMAND</arg>
56 <arg choice="opt" rep="repeat">NAME</arg>
61 <title>Description</title>
63 <para><command>systemctl</command> may be used to
64 introspect and control the state of the
65 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
66 system and service manager.</para>
70 <title>Options</title>
72 <para>The following options are understood:</para>
76 <term><option>-t</option></term>
77 <term><option>--type=</option></term>
80 <para>The argument should be a comma-separated list of unit
81 types such as <option>service</option> and
82 <option>socket</option>.
85 <para>If one of the arguments is a unit type, when listing
86 units, limit display to certain unit types. Otherwise, units
87 of all types will be shown.</para>
89 <para>As a special case, if one of the arguments is
90 <option>help</option>, a list of allowed values will be
91 printed and the program will exit.</para>
96 <term><option>--state=</option></term>
99 <para>The argument should be a comma-separated list of unit LOAD,
100 SUB, or ACTIVE states. When listing units, show only those
101 in specified states.</para>
106 <term><option>-p</option></term>
107 <term><option>--property=</option></term>
110 <para>When showing unit/job/manager properties with the
111 <command>show</command> command, limit display to certain
112 properties as specified as argument. If not specified, all
113 set properties are shown. The argument should be a
114 comma-separated list of property names, such as
115 <literal>MainPID</literal>. If specified more than once, all
116 properties with the specified names are shown.</para>
121 <term><option>-a</option></term>
122 <term><option>--all</option></term>
125 <para>When listing units, show all loaded units, regardless
126 of their state, including inactive units. When showing
127 unit/job/manager properties, show all properties regardless
128 whether they are set or not.</para>
129 <para>To list all units installed on the system, use the
130 <command>list-unit-files</command> command instead.</para>
135 <term><option>-r</option></term>
136 <term><option>--recursive</option></term>
139 <para>When listing units, also show units of local
140 containers. Units of local containers will be prefixed with
141 the container name, separated by a single colon character
142 (<literal>:</literal>).</para>
147 <term><option>--reverse</option></term>
150 <para>Show reverse dependencies between units with
151 <command>list-dependencies</command>, i.e. units with
152 dependencies of type <varname>Wants=</varname> or
153 <varname>Requires=</varname> on the given unit.
159 <term><option>--after</option></term>
162 <para>With <command>list-dependencies</command>, show the
163 units that are ordered before the specified unit. In other
164 words, list the units that are in the <varname>After=</varname>
165 directive of the specified unit, have the specified unit in
166 their <varname>Before=</varname> directive, or are otherwise
167 implicit dependencies of the specified unit.</para>
172 <term><option>--before</option></term>
175 <para>With <command>list-dependencies</command>, show the
176 units that are ordered after the specified unit. In other
177 words, list the units that are in the <varname>Before=</varname>
178 directive of the specified unit, have the specified unit in
179 their <varname>After=</varname> directive, or otherwise depend
180 on the specified unit.</para>
185 <term><option>-l</option></term>
186 <term><option>--full</option></term>
189 <para>Do not ellipsize unit names, process tree entries,
190 journal output, or truncate unit descriptions in the output
191 of <command>status</command>, <command>list-units</command>,
192 <command>list-jobs</command>, and
193 <command>list-timers</command>.</para>
198 <term><option>--show-types</option></term>
201 <para>When showing sockets, show the type of the socket.</para>
206 <term><option>--job-mode=</option></term>
209 <para>When queuing a new job, this option controls how to deal with
210 already queued jobs. It takes one of <literal>fail</literal>,
211 <literal>replace</literal>,
212 <literal>replace-irreversibly</literal>,
213 <literal>isolate</literal>,
214 <literal>ignore-dependencies</literal>,
215 <literal>ignore-requirements</literal> or
216 <literal>flush</literal>. Defaults to
217 <literal>replace</literal>, except when the
218 <command>isolate</command> command is used which implies the
219 <literal>isolate</literal> job mode.</para>
221 <para>If <literal>fail</literal> is specified and a requested
222 operation conflicts with a pending job (more specifically:
223 causes an already pending start job to be reversed into a stop
224 job or vice versa), cause the operation to fail.</para>
226 <para>If <literal>replace</literal> (the default) is
227 specified, any conflicting pending job will be replaced, as
230 <para>If <literal>replace-irreversibly</literal> is specified,
231 operate like <literal>replace</literal>, but also mark the new
232 jobs as irreversible. This prevents future conflicting
233 transactions from replacing these jobs (or even being enqueued
234 while the irreversible jobs are still pending). Irreversible
235 jobs can still be cancelled using the <command>cancel</command>
238 <para><literal>isolate</literal> is only valid for start
239 operations and causes all other units to be stopped when the
240 specified unit is started. This mode is always used when the
241 <command>isolate</command> command is used.</para>
243 <para><literal>flush</literal> will cause all queued jobs to
244 be canceled when the new job is enqueued.</para>
246 <para>If <literal>ignore-dependencies</literal> is specified,
247 then all unit dependencies are ignored for this new job and
248 the operation is executed immediately. If passed, no required
249 units of the unit passed will be pulled in, and no ordering
250 dependencies will be honored. This is mostly a debugging and
251 rescue tool for the administrator and should not be used by
254 <para><literal>ignore-requirements</literal> is similar to
255 <literal>ignore-dependencies</literal>, but only causes the
256 requirement dependencies to be ignored, the ordering
257 dependencies will still be honoured.</para>
263 <term><option>-i</option></term>
264 <term><option>--ignore-inhibitors</option></term>
267 <para>When system shutdown or a sleep state is requested,
268 ignore inhibitor locks. Applications can establish inhibitor
269 locks to avoid that certain important operations (such as CD
270 burning or suchlike) are interrupted by system shutdown or a
271 sleep state. Any user may take these locks and privileged
272 users may override these locks. If any locks are taken,
273 shutdown and sleep state requests will normally fail
274 (regardless of whether privileged or not) and a list of active locks
275 is printed. However, if <option>--ignore-inhibitors</option>
276 is specified, the locks are ignored and not printed, and the
277 operation attempted anyway, possibly requiring additional
283 <term><option>-q</option></term>
284 <term><option>--quiet</option></term>
287 <para>Suppress output to standard output in
288 <command>snapshot</command>,
289 <command>is-active</command>,
290 <command>is-failed</command>,
291 <command>enable</command> and
292 <command>disable</command>.</para>
297 <term><option>--no-block</option></term>
300 <para>Do not synchronously wait for the requested operation
301 to finish. If this is not specified, the job will be
302 verified, enqueued and <command>systemctl</command> will
303 wait until it is completed. By passing this argument, it is
304 only verified and enqueued.</para>
309 <term><option>--no-legend</option></term>
312 <para>Do not print the legend, i.e. the column headers and
313 the footer with hints.</para>
317 <xi:include href="user-system-options.xml" xpointer="user" />
318 <xi:include href="user-system-options.xml" xpointer="system" />
321 <term><option>--no-wall</option></term>
324 <para>Do not send wall message before halt, power-off,
330 <term><option>--global</option></term>
333 <para>When used with <command>enable</command> and
334 <command>disable</command>, operate on the global user
335 configuration directory, thus enabling or disabling a unit
336 file globally for all future logins of all users.</para>
341 <term><option>--no-reload</option></term>
344 <para>When used with <command>enable</command> and
345 <command>disable</command>, do not implicitly reload daemon
346 configuration after executing the changes.</para>
351 <term><option>--no-ask-password</option></term>
354 <para>When used with <command>start</command> and related
355 commands, disables asking for passwords. Background services
356 may require input of a password or passphrase string, for
357 example to unlock system hard disks or cryptographic
358 certificates. Unless this option is specified and the
359 command is invoked from a terminal,
360 <command>systemctl</command> will query the user on the
361 terminal for the necessary secrets. Use this option to
362 switch this behavior off. In this case, the password must be
363 supplied by some other means (for example graphical password
364 agents) or the service might fail. This also disables
365 querying the user for authentication for privileged
372 <term><option>--kill-who=</option></term>
375 <para>When used with <command>kill</command>, choose which
376 processes to send a signal to. Must be one of
377 <option>main</option>, <option>control</option> or
378 <option>all</option> to select whether to kill only the main
379 process, the control process or all processes of the
380 unit. The main process of the unit is the one that defines
381 the life-time of it. A control process of a unit is one that
382 is invoked by the manager to induce state changes of it. For
383 example, all processes started due to the
384 <varname>ExecStartPre=</varname>,
385 <varname>ExecStop=</varname> or
386 <varname>ExecReload=</varname> settings of service units are
387 control processes. Note that there is only one control
388 process per unit at a time, as only one state change is
389 executed at a time. For services of type
390 <varname>Type=forking</varname>, the initial process started
391 by the manager for <varname>ExecStart=</varname> is a
392 control process, while the process ultimately forked off by
393 that one is then considered the main process of the unit (if
394 it can be determined). This is different for service units
395 of other types, where the process forked off by the manager
396 for <varname>ExecStart=</varname> is always the main process
397 itself. A service unit consists of zero or one main process,
398 zero or one control process plus any number of additional
399 processes. Not all unit types manage processes of these
400 types however. For example, for mount units, control processes
401 are defined (which are the invocations of
402 <filename>/usr/bin/mount</filename> and
403 <filename>/usr/bin/umount</filename>), but no main process
404 is defined. If omitted, defaults to
405 <option>all</option>.</para>
411 <term><option>-s</option></term>
412 <term><option>--signal=</option></term>
415 <para>When used with <command>kill</command>, choose which
416 signal to send to selected processes. Must be one of the
417 well known signal specifiers such as <constant>SIGTERM</constant>, <constant>SIGINT</constant> or
418 <constant>SIGSTOP</constant>. If omitted, defaults to
419 <option>SIGTERM</option>.</para>
424 <term><option>-f</option></term>
425 <term><option>--force</option></term>
428 <para>When used with <command>enable</command>, overwrite
429 any existing conflicting symlinks.</para>
431 <para>When used with <command>halt</command>,
432 <command>poweroff</command>, <command>reboot</command> or
433 <command>kexec</command>, execute the selected operation
434 without shutting down all units. However, all processes will
435 be killed forcibly and all file systems are unmounted or
436 remounted read-only. This is hence a drastic but relatively
437 safe option to request an immediate reboot. If
438 <option>--force</option> is specified twice for these
439 operations, they will be executed immediately without
440 terminating any processes or unmounting any file
441 systems. Warning: specifying <option>--force</option> twice
442 with any of these operations might result in data
448 <term><option>--root=</option></term>
452 <command>enable</command>/<command>disable</command>/<command>is-enabled</command>
453 (and related commands), use alternative root path when
454 looking for unit files.</para>
460 <term><option>--runtime</option></term>
463 <para>When used with <command>enable</command>,
464 <command>disable</command>,
465 (and related commands), make changes only temporarily, so
466 that they are lost on the next reboot. This will have the
467 effect that changes are not made in subdirectories of
468 <filename>/etc</filename> but in <filename>/run</filename>,
469 with identical immediate effects, however, since the latter
470 is lost on reboot, the changes are lost too.</para>
472 <para>Similarly, when used with
473 <command>set-property</command>, make changes only
474 temporarily, so that they are lost on the next
480 <term><option>--preset-mode=</option></term>
483 <para>Takes one of <literal>full</literal> (the default),
484 <literal>enable-only</literal>,
485 <literal>disable-only</literal>. When use with the
486 <command>preset</command> or <command>preset-all</command>
487 commands controls whether units shall be disabled and
488 enabled according to the preset rules, or only enabled, or
489 only disabled.</para>
494 <term><option>-n</option></term>
495 <term><option>--lines=</option></term>
498 <para>When used with <command>status</command>, controls the
499 number of journal lines to show, counting from the most
500 recent ones. Takes a positive integer argument. Defaults to
506 <term><option>-o</option></term>
507 <term><option>--output=</option></term>
510 <para>When used with <command>status</command>, controls the
511 formatting of the journal entries that are shown. For the
512 available choices, see
513 <citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
514 Defaults to <literal>short</literal>.</para>
519 <term><option>--plain</option></term>
522 <para>When used with <command>list-dependencies</command>,
523 the output is printed as a list instead of a tree.</para>
527 <xi:include href="user-system-options.xml" xpointer="host" />
528 <xi:include href="user-system-options.xml" xpointer="machine" />
530 <xi:include href="standard-options.xml" xpointer="help" />
531 <xi:include href="standard-options.xml" xpointer="version" />
532 <xi:include href="standard-options.xml" xpointer="no-pager" />
537 <title>Commands</title>
539 <para>The following commands are understood:</para>
542 <title>Unit Commands</title>
546 <term><command>list-units <optional><replaceable>PATTERN</replaceable>...</optional></command></term>
549 <para>List known units (subject to limitations specified
550 with <option>-t</option>). If one or more
551 <replaceable>PATTERN</replaceable>s are specified, only
552 units matching one of them are shown.</para>
554 <para>This is the default command.</para>
559 <term><command>list-sockets <optional><replaceable>PATTERN</replaceable>...</optional></command></term>
562 <para>List socket units ordered by listening address.
563 If one or more <replaceable>PATTERN</replaceable>s are
564 specified, only socket units matching one of them are
565 shown. Produces output similar to
567 LISTEN UNIT ACTIVATES
568 /dev/initctl systemd-initctl.socket systemd-initctl.service
570 [::]:22 sshd.socket sshd.service
571 kobject-uevent 1 systemd-udevd-kernel.socket systemd-udevd.service
573 5 sockets listed.</programlisting>
574 Note: because the addresses might contains spaces, this output
575 is not suitable for programmatic consumption.
578 <para>See also the options <option>--show-types</option>,
579 <option>--all</option>, and <option>--failed</option>.</para>
584 <term><command>list-timers <optional><replaceable>PATTERN</replaceable>...</optional></command></term>
587 <para>List timer units ordered by the time they elapse
588 next. If one or more <replaceable>PATTERN</replaceable>s
589 are specified, only units matching one of them are shown.
592 <para>See also the options <option>--all</option> and
593 <option>--failed</option>.</para>
598 <term><command>start <replaceable>PATTERN</replaceable>...</command></term>
601 <para>Start (activate) one or more units specified on the
604 <para>Note that glob patterns operate on a list of currently
605 loaded units. Units which are not active and are not in a
606 failed state usually are not loaded, and would not be
607 matched by any pattern. In addition, in case of
608 instantiated units, systemd is often unaware of the
609 instance name until the instance has been started. Therefore,
610 using glob patterns with <command>start</command>
611 has limited usefulness.</para>
615 <term><command>stop <replaceable>PATTERN</replaceable>...</command></term>
618 <para>Stop (deactivate) one or more units specified on the
623 <term><command>reload <replaceable>PATTERN</replaceable>...</command></term>
626 <para>Asks all units listed on the command line to reload
627 their configuration. Note that this will reload the
628 service-specific configuration, not the unit configuration
629 file of systemd. If you want systemd to reload the
630 configuration file of a unit, use the
631 <command>daemon-reload</command> command. In other words:
632 for the example case of Apache, this will reload Apache's
633 <filename>httpd.conf</filename> in the web server, not the
634 <filename>apache.service</filename> systemd unit
637 <para>This command should not be confused with the
638 <command>daemon-reload</command> or <command>load</command>
644 <term><command>restart <replaceable>PATTERN</replaceable>...</command></term>
647 <para>Restart one or more units specified on the command
648 line. If the units are not running yet, they will be
653 <term><command>try-restart <replaceable>PATTERN</replaceable>...</command></term>
656 <para>Restart one or more units specified on the command
657 line if the units are running. This does nothing if units are not
658 running. Note that, for compatibility with Red Hat init
659 scripts, <command>condrestart</command> is equivalent to this
664 <term><command>reload-or-restart <replaceable>PATTERN</replaceable>...</command></term>
667 <para>Reload one or more units if they support it. If not,
668 restart them instead. If the units are not running yet, they
669 will be started.</para>
673 <term><command>reload-or-try-restart <replaceable>PATTERN</replaceable>...</command></term>
676 <para>Reload one or more units if they support it. If not,
677 restart them instead. This does nothing if the units are not
678 running. Note that, for compatibility with SysV init scripts,
679 <command>force-reload</command> is equivalent to this
684 <term><command>isolate <replaceable>NAME</replaceable></command></term>
687 <para>Start the unit specified on the command line and its
688 dependencies and stop all others.</para>
690 <para>This is similar to changing the runlevel in a
691 traditional init system. The <command>isolate</command>
692 command will immediately stop processes that are not enabled
693 in the new unit, possibly including the graphical
694 environment or terminal you are currently using.</para>
696 <para>Note that this is allowed only on units where
697 <option>AllowIsolate=</option> is enabled. See
698 <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
703 <term><command>kill <replaceable>PATTERN</replaceable>...</command></term>
706 <para>Send a signal to one or more processes of the
707 unit. Use <option>--kill-who=</option> to select which
708 process to kill. Use <option>--signal=</option> to select
709 the signal to send.</para>
713 <term><command>is-active <replaceable>PATTERN</replaceable>...</command></term>
716 <para>Check whether any of the specified units are active
717 (i.e. running). Returns an exit code
718 <constant>0</constant> if at least one is active, or
719 non-zero otherwise. Unless <option>--quiet</option> is
720 specified, this will also print the current unit state to
721 standard output.</para>
725 <term><command>is-failed <replaceable>PATTERN</replaceable>...</command></term>
728 <para>Check whether any of the specified units are in a
729 "failed" state. Returns an exit code
730 <constant>0</constant> if at least one has failed,
731 non-zero otherwise. Unless <option>--quiet</option> is
732 specified, this will also print the current unit state to
733 standard output.</para>
737 <term><command>status</command> <optional><replaceable>PATTERN</replaceable>...|<replaceable>PID</replaceable>...]</optional></term>
740 <para>Show terse runtime status information about one or
741 more units, followed by most recent log data from the
742 journal. If no units are specified, show system status. If
743 combined with <option>--all</option>, also show the status of
744 all units (subject to limitations specified with
745 <option>-t</option>). If a PID is passed, show information
746 about the unit the process belongs to.</para>
748 <para>This function is intended to generate human-readable
749 output. If you are looking for computer-parsable output,
750 use <command>show</command> instead. By default this
751 function only shows 10 lines of output and ellipsizes
752 lines to fit in the terminal window. This can be changes
753 with <option>--lines</option> and <option>--full</option>,
754 see above. In addition, <command>journalctl
755 --unit=<replaceable>NAME</replaceable></command> or
757 --user-unit=<replaceable>NAME</replaceable></command> use
758 a similar filter for messages and might be more
764 <term><command>show</command> <optional><replaceable>PATTERN</replaceable>...|<replaceable>JOB</replaceable>...</optional></term>
767 <para>Show properties of one or more units, jobs, or the
768 manager itself. If no argument is specified, properties of
769 the manager will be shown. If a unit name is specified,
770 properties of the unit is shown, and if a job id is
771 specified, properties of the job is shown. By default, empty
772 properties are suppressed. Use <option>--all</option> to
773 show those too. To select specific properties to show, use
774 <option>--property=</option>. This command is intended to be
775 used whenever computer-parsable output is required. Use
776 <command>status</command> if you are looking for formatted
777 human-readable output.</para>
781 <term><command>cat <replaceable>PATTERN</replaceable>...</command></term>
784 <para>Show backing files of one or more units. Prints the
785 "fragment" and "drop-ins" (source files) of units. Each
786 file is preceded by a comment which includes the file
791 <term><command>set-property <replaceable>NAME</replaceable> <replaceable>ASSIGNMENT</replaceable>...</command></term>
794 <para>Set the specified unit properties at runtime where
795 this is supported. This allows changing configuration
796 parameter properties such as resource control settings at
797 runtime. Not all properties may be changed at runtime, but
798 many resource control settings (primarily those in
799 <citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>)
800 may. The changes are applied instantly, and stored on disk
801 for future boots, unless <option>--runtime</option> is
802 passed, in which case the settings only apply until the
803 next reboot. The syntax of the property assignment follows
804 closely the syntax of assignments in unit files.</para>
806 <para>Example: <command>systemctl set-property foobar.service CPUShares=777</command></para>
808 <para>Note that this command allows changing multiple
809 properties at the same time, which is preferable over
810 setting them individually. Like unit file configuration
811 settings, assigning the empty list to list parameters will
812 reset the list.</para>
817 <term><command>help <replaceable>PATTERN</replaceable>...|<replaceable>PID</replaceable>...</command></term>
820 <para>Show manual pages for one or more units, if
821 available. If a PID is given, the manual pages for the unit
822 the process belongs to are shown.</para>
827 <term><command>reset-failed [<replaceable>PATTERN</replaceable>...]</command></term>
830 <para>Reset the <literal>failed</literal> state of the
831 specified units, or if no unit name is passed, reset the state of all
832 units. When a unit fails in some way (i.e. process exiting
833 with non-zero error code, terminating abnormally or timing
834 out), it will automatically enter the
835 <literal>failed</literal> state and its exit code and status
836 is recorded for introspection by the administrator until the
837 service is restarted or reset with this command.</para>
842 <term><command>list-dependencies <replaceable>NAME</replaceable></command></term>
845 <para>Shows required and wanted units of the specified
846 unit. If no unit is specified,
847 <filename>default.target</filename> is implied. Target units
848 are recursively expanded. When <option>--all</option> is
849 passed, all other units are recursively expanded as
857 <title>Unit File Commands</title>
861 <term><command>list-unit-files <optional><replaceable>PATTERN...</replaceable></optional></command></term>
864 <para>List installed unit files. If one or more
865 <replaceable>PATTERN</replaceable>s are specified, only
866 units whose filename (just the last component of the path)
867 matches one of them are shown.</para>
872 <term><command>enable <replaceable>NAME</replaceable>...</command></term>
875 <para>Enable one or more unit files or unit file instances,
876 as specified on the command line. This will create a number
877 of symlinks as encoded in the <literal>[Install]</literal>
878 sections of the unit files. After the symlinks have been
879 created, the systemd configuration is reloaded (in a way that
880 is equivalent to <command>daemon-reload</command>) to ensure
881 the changes are taken into account immediately. Note that
882 this does <emphasis>not</emphasis> have the effect of also
883 starting any of the units being enabled. If this
884 is desired, a separate <command>start</command> command must
885 be invoked for the unit. Also note that in case of instance
886 enablement, symlinks named the same as instances are created in
887 the install location, however they all point to the same
888 template unit file.</para>
890 <para>This command will print the actions executed. This
891 output may be suppressed by passing <option>--quiet</option>.
894 <para>Note that this operation creates only the suggested
895 symlinks for the units. While this command is the
896 recommended way to manipulate the unit configuration
897 directory, the administrator is free to make additional
898 changes manually by placing or removing symlinks in the
899 directory. This is particularly useful to create
900 configurations that deviate from the suggested default
901 installation. In this case, the administrator must make sure
902 to invoke <command>daemon-reload</command> manually as
903 necessary to ensure the changes are taken into account.
906 <para>Enabling units should not be confused with starting
907 (activating) units, as done by the <command>start</command>
908 command. Enabling and starting units is orthogonal: units
909 may be enabled without being started and started without
910 being enabled. Enabling simply hooks the unit into various
911 suggested places (for example, so that the unit is
912 automatically started on boot or when a particular kind of
913 hardware is plugged in). Starting actually spawns the daemon
914 process (in case of service units), or binds the socket (in
915 case of socket units), and so on.</para>
917 <para>Depending on whether <option>--system</option>,
918 <option>--user</option>, <option>--runtime</option>,
919 or <option>--global</option> is specified, this enables the unit
920 for the system, for the calling user only, for only this boot of
921 the system, or for all future logins of all users, or only this
922 boot. Note that in the last case, no systemd daemon
923 configuration is reloaded.</para>
928 <term><command>disable <replaceable>NAME</replaceable>...</command></term>
931 <para>Disables one or more units. This removes all symlinks
932 to the specified unit files from the unit configuration
933 directory, and hence undoes the changes made by
934 <command>enable</command>. Note however that this removes
935 all symlinks to the unit files (i.e. including manual
936 additions), not just those actually created by
937 <command>enable</command>. This call implicitly reloads the
938 systemd daemon configuration after completing the disabling
939 of the units. Note that this command does not implicitly
940 stop the units that are being disabled. If this is desired,
941 an additional <command>stop</command> command should be
942 executed afterwards.</para>
944 <para>This command will print the actions executed. This
945 output may be suppressed by passing <option>--quiet</option>.
948 <para>This command honors <option>--system</option>,
949 <option>--user</option>, <option>--runtime</option> and
950 <option>--global</option> in a similar way as
951 <command>enable</command>.</para>
956 <term><command>is-enabled <replaceable>NAME</replaceable>...</command></term>
959 <para>Checks whether any of the specified unit files are
960 enabled (as with <command>enable</command>). Returns an
961 exit code of 0 if at least one is enabled, non-zero
962 otherwise. Prints the current enable status (see table).
963 To suppress this output, use <option>--quiet</option>.
968 <command>is-enabled</command> output
974 <entry>Printed string</entry>
975 <entry>Meaning</entry>
976 <entry>Return value</entry>
981 <entry><literal>enabled</literal></entry>
982 <entry morerows='1'>Enabled through a symlink in <filename>.wants</filename> directory (permanently or just in <filename>/run</filename>)</entry>
983 <entry morerows='1'>0</entry>
986 <entry><literal>enabled-runtime</literal></entry>
989 <entry><literal>linked</literal></entry>
990 <entry morerows='1'>Made available through a symlink to the unit file (permanently or just in <filename>/run</filename>)</entry>
991 <entry morerows='1'>1</entry>
994 <entry><literal>linked-runtime</literal></entry>
997 <entry><literal>masked</literal></entry>
998 <entry morerows='1'>Disabled entirely (permanently or just in <filename>/run</filename>)</entry>
999 <entry morerows='1'>1</entry>
1002 <entry><literal>masked-runtime</literal></entry>
1005 <entry><literal>static</literal></entry>
1006 <entry>Unit is not enabled, but has no provisions for enabling in [Install] section</entry>
1010 <entry><literal>disabled</literal></entry>
1011 <entry>Unit is not enabled</entry>
1022 <term><command>reenable <replaceable>NAME</replaceable>...</command></term>
1025 <para>Reenable one or more unit files, as specified on the
1026 command line. This is a combination of
1027 <command>disable</command> and <command>enable</command> and
1028 is useful to reset the symlinks a unit is enabled with to
1029 the defaults configured in the <literal>[Install]</literal>
1030 section of the unit file.</para>
1035 <term><command>preset <replaceable>NAME</replaceable>...</command></term>
1038 <para>Reset one or more unit files, as specified on the
1039 command line, to the defaults configured in the preset
1040 policy files. This has the same effect as
1041 <command>disable</command> or <command>enable</command>,
1042 depending how the unit is listed in the preset files.</para>
1044 <para>Use <option>--preset-mode=</option> to control
1045 whether units shall be enabled and disabled, or only
1046 enabled, or only disabled.</para>
1048 <para>For more information on the preset policy format,
1050 <citerefentry><refentrytitle>systemd.preset</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
1051 For more information on the concept of presets, please
1053 url="http://freedesktop.org/wiki/Software/systemd/Preset">Preset</ulink>
1059 <term><command>preset-all</command></term>
1062 <para>Resets all installed unit files to the defaults
1063 configured in the preset policy file (see above).</para>
1065 <para>Use <option>--preset-mode=</option> to control
1066 whether units shall be enabled and disabled, or only
1067 enabled, or only disabled.</para>
1072 <term><command>mask <replaceable>NAME</replaceable>...</command></term>
1075 <para>Mask one or more unit files, as specified on the
1076 command line. This will link these units to
1077 <filename>/dev/null</filename>, making it impossible to
1078 start them. This is a stronger version of
1079 <command>disable</command>, since it prohibits all kinds of
1080 activation of the unit, including manual activation. Use
1081 this option with care. This honors the
1082 <option>--runtime</option> option to only mask temporarily
1083 until the next reboot of the system.</para>
1088 <term><command>unmask <replaceable>NAME</replaceable>...</command></term>
1091 <para>Unmask one or more unit files, as specified on the
1092 command line. This will undo the effect of
1093 <command>mask</command>.</para>
1098 <term><command>link <replaceable>FILENAME</replaceable>...</command></term>
1101 <para>Link a unit file that is not in the unit file search
1102 paths into the unit file search path. This requires an
1103 absolute path to a unit file. The effect of this can be
1104 undone with <command>disable</command>. The effect of this
1105 command is that a unit file is available for
1106 <command>start</command> and other commands although it
1107 is not installed directly in the unit search path.</para>
1112 <term><command>get-default</command></term>
1115 <para>Get the default target specified
1116 via <filename>default.target</filename> link.</para>
1121 <term><command>set-default <replaceable>NAME</replaceable></command></term>
1124 <para>Set the default target to boot into. Command links
1125 <filename>default.target</filename> to the given unit.</para>
1132 <title>Machine Commands</title>
1136 <term><command>list-machines <optional><replaceable>PATTERN</replaceable>...</optional></command></term>
1139 <para>List the host and all running local containers with
1140 their state. If one or more
1141 <replaceable>PATTERN</replaceable>s are specified, only
1142 containers matching one of them are shown.
1150 <title>Job Commands</title>
1154 <term><command>list-jobs <optional><replaceable>PATTERN...</replaceable></optional></command></term>
1157 <para>List jobs that are in progress. If one or more
1158 <replaceable>PATTERN</replaceable>s are specified, only
1159 jobs for units matching one of them are shown.</para>
1163 <term><command>cancel <replaceable>JOB</replaceable>...</command></term>
1166 <para>Cancel one or more jobs specified on the command line
1167 by their numeric job IDs. If no job ID is specified, cancel
1168 all pending jobs.</para>
1175 <title>Snapshot Commands</title>
1179 <term><command>snapshot <optional><replaceable>NAME</replaceable></optional></command></term>
1182 <para>Create a snapshot. If a snapshot name is specified,
1183 the new snapshot will be named after it. If none is
1184 specified, an automatic snapshot name is generated. In
1185 either case, the snapshot name used is printed to standard
1186 output, unless <option>--quiet</option> is specified.
1189 <para>A snapshot refers to a saved state of the systemd
1190 manager. It is implemented itself as a unit that is
1191 generated dynamically with this command and has dependencies
1192 on all units active at the time. At a later time, the user
1193 may return to this state by using the
1194 <command>isolate</command> command on the snapshot unit.
1197 <para>Snapshots are only useful for saving and restoring
1198 which units are running or are stopped, they do not
1199 save/restore any other state. Snapshots are dynamic and lost
1204 <term><command>delete <replaceable>PATTERN</replaceable>...</command></term>
1207 <para>Remove a snapshot previously created with
1208 <command>snapshot</command>.</para>
1215 <title>Environment Commands</title>
1219 <term><command>show-environment</command></term>
1222 <para>Dump the systemd manager environment block. The
1223 environment block will be dumped in straight-forward form
1224 suitable for sourcing into a shell script. This environment
1225 block will be passed to all processes the manager
1230 <term><command>set-environment <replaceable>VARIABLE=VALUE</replaceable>...</command></term>
1233 <para>Set one or more systemd manager environment variables,
1234 as specified on the command line.</para>
1238 <term><command>unset-environment <replaceable>VARIABLE</replaceable>...</command></term>
1241 <para>Unset one or more systemd manager environment
1242 variables. If only a variable name is specified, it will be
1243 removed regardless of its value. If a variable and a value
1244 are specified, the variable is only removed if it has the
1245 specified value.</para>
1249 <term><command>import-environment <replaceable>VARIABLE</replaceable>...</command></term>
1252 <para>Import all, one or more environment variables set on
1253 the client into the systemd manager environment block. If
1254 no arguments are passed, the entire environment block is
1255 imported. Otherwise, a list of one or more environment
1256 variable names should be passed, whose client-side values
1257 are then imported into the manager's environment
1265 <title>Manager Lifecycle Commands</title>
1269 <term><command>daemon-reload</command></term>
1272 <para>Reload systemd manager configuration. This will reload
1273 all unit files and recreate the entire dependency
1274 tree. While the daemon is being reloaded, all sockets systemd
1275 listens on on behalf of user configuration will stay
1276 accessible.</para> <para>This command should not be confused
1277 with the <command>load</command> or
1278 <command>reload</command> commands.</para>
1282 <term><command>daemon-reexec</command></term>
1285 <para>Reexecute the systemd manager. This will serialize the
1286 manager state, reexecute the process and deserialize the
1287 state again. This command is of little use except for
1288 debugging and package upgrades. Sometimes, it might be
1289 helpful as a heavy-weight <command>daemon-reload</command>.
1290 While the daemon is being reexecuted, all sockets systemd listening
1291 on behalf of user configuration will stay accessible.
1299 <title>System Commands</title>
1303 <term><command>default</command></term>
1306 <para>Enter default mode. This is mostly equivalent to
1307 <command>isolate default.target</command>.</para>
1311 <term><command>rescue</command></term>
1314 <para>Enter rescue mode. This is mostly equivalent to
1315 <command>isolate rescue.target</command>, but also prints a
1316 wall message to all users.</para>
1320 <term><command>emergency</command></term>
1323 <para>Enter emergency mode. This is mostly equivalent to
1324 <command>isolate emergency.target</command>, but also prints
1325 a wall message to all users.</para>
1329 <term><command>halt</command></term>
1332 <para>Shut down and halt the system. This is mostly equivalent to
1333 <command>start halt.target --irreversible</command>, but also
1334 prints a wall message to all users. If combined with
1335 <option>--force</option>, shutdown of all running services is
1336 skipped, however all processes are killed and all file
1337 systems are unmounted or mounted read-only, immediately
1338 followed by the system halt. If <option>--force</option> is
1339 specified twice, the operation is immediately executed
1340 without terminating any processes or unmounting any file
1341 systems. This may result in data loss.</para>
1345 <term><command>poweroff</command></term>
1348 <para>Shut down and power-off the system. This is mostly
1349 equivalent to <command>start poweroff.target --irreversible</command>,
1350 but also prints a wall message to all users. If combined with
1351 <option>--force</option>, shutdown of all running services is
1352 skipped, however all processes are killed and all file
1353 systems are unmounted or mounted read-only, immediately
1354 followed by the powering off. If <option>--force</option> is
1355 specified twice, the operation is immediately executed
1356 without terminating any processes or unmounting any file
1357 systems. This may result in data loss.</para>
1361 <term><command>reboot <optional><replaceable>arg</replaceable></optional></command></term>
1364 <para>Shut down and reboot the system. This is mostly
1365 equivalent to <command>start reboot.target --irreversible</command>,
1366 but also prints a wall message to all users. If combined with
1367 <option>--force</option>, shutdown of all running services is
1368 skipped, however all processes are killed and all file
1369 systems are unmounted or mounted read-only, immediately
1370 followed by the reboot. If <option>--force</option> is
1371 specified twice, the operation is immediately executed
1372 without terminating any processes or unmounting any file
1373 systems. This may result in data loss.</para>
1375 <para>If the optional argument
1376 <replaceable>arg</replaceable> is given, it will be passed
1377 as the optional argument to the
1378 <citerefentry><refentrytitle>reboot</refentrytitle><manvolnum>2</manvolnum></citerefentry>
1379 system call. The value is architecture and firmware
1380 specific. As an example, <literal>recovery</literal> might
1381 be used to trigger system recovery, and
1382 <literal>fota</literal> might be used to trigger a
1383 <quote>firmware over the air</quote> update.</para>
1387 <term><command>kexec</command></term>
1390 <para>Shut down and reboot the system via kexec. This is
1391 mostly equivalent to <command>start kexec.target --irreversible</command>,
1392 but also prints a wall message to all users. If combined
1393 with <option>--force</option>, shutdown of all running
1394 services is skipped, however all processes are killed and
1395 all file systems are unmounted or mounted read-only,
1396 immediately followed by the reboot.</para>
1400 <term><command>exit</command></term>
1403 <para>Ask the systemd manager to quit. This is only
1404 supported for user service managers (i.e. in conjunction
1405 with the <option>--user</option> option) and will fail
1411 <term><command>suspend</command></term>
1414 <para>Suspend the system. This will trigger activation of
1415 the special <filename>suspend.target</filename> target.
1420 <term><command>hibernate</command></term>
1423 <para>Hibernate the system. This will trigger activation of
1424 the special <filename>hibernate.target</filename> target.
1429 <term><command>hybrid-sleep</command></term>
1432 <para>Hibernate and suspend the system. This will trigger
1433 activation of the special
1434 <filename>hybrid-sleep.target</filename> target.</para>
1438 <term><command>switch-root <replaceable>ROOT</replaceable> <optional><replaceable>INIT</replaceable></optional></command></term>
1441 <para>Switches to a different root directory and executes a
1442 new system manager process below it. This is intended for
1443 usage in initial RAM disks ("initrd"), and will transition
1444 from the initrd's system manager process (a.k.a "init"
1445 process) to the main system manager process. This call takes two
1446 arguments: the directory that is to become the new root directory, and
1447 the path to the new system manager binary below it to
1448 execute as PID 1. If the latter is omitted or the empty
1449 string, a systemd binary will automatically be searched for
1450 and used as init. If the system manager path is omitted or
1451 equal to the empty string, the state of the initrd's system
1452 manager process is passed to the main system manager, which
1453 allows later introspection of the state of the services
1454 involved in the initrd boot.</para>
1461 <title>Parameter Syntax</title>
1463 <para>Unit commands listed above take either a single unit name
1464 (designated as <replaceable>NAME</replaceable>), or multiple
1465 unit specifications (designated as
1466 <replaceable>PATTERN</replaceable>...). In the first case, the
1467 unit name with or without a suffix must be given. If the suffix
1468 is not specified, systemctl will append a suitable suffix,
1469 <literal>.service</literal> by default, and a type-specific
1470 suffix in case of commands which operate only on specific unit
1472 <programlisting># systemctl start sshd</programlisting> and
1473 <programlisting># systemctl start sshd.service</programlisting>
1474 are equivalent, as are
1475 <programlisting># systemctl isolate snapshot-11</programlisting>
1477 <programlisting># systemctl isolate snapshot-11.snapshot</programlisting>
1478 Note that (absolute) paths to device nodes are automatically
1479 converted to device unit names, and other (absolute) paths to
1481 <programlisting># systemctl status /dev/sda
1482 # systemctl status /home</programlisting>
1484 <programlisting># systemctl status dev-sda.device
1485 # systemctl status home.mount</programlisting>
1486 In the second case, shell-style globs will be matched against
1487 currently loaded units; literal unit names, with or without
1488 a suffix, will be treated as in the first case. This means that
1489 literal unit names always refer to exactly one unit, but globs
1490 may match zero units and this is not considered an error.</para>
1492 <para>Glob patterns use
1493 <citerefentry><refentrytitle>fnmatch</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
1494 so normal shell-style globbing rules are used, and
1495 <literal>*</literal>, <literal>?</literal>,
1496 <literal>[]</literal> may be used. See
1497 <citerefentry><refentrytitle>glob</refentrytitle><manvolnum>7</manvolnum></citerefentry>
1498 for more details. The patterns are matched against the names of
1499 currently loaded units, and patterns which do not match anything
1500 are silently skipped. For example:
1501 <programlisting># systemctl stop sshd@*.service</programlisting>
1502 will stop all <filename>sshd@.service</filename> instances.
1505 <para>For unit file commands, the specified
1506 <replaceable>NAME</replaceable> should be the full name of the
1507 unit file, or the absolute path to the unit file:
1508 <programlisting># systemctl enable foo.service</programlisting>
1510 <programlisting># systemctl link /path/to/foo.service</programlisting>
1517 <title>Exit status</title>
1519 <para>On success, 0 is returned, a non-zero failure
1520 code otherwise.</para>
1523 <xi:include href="less-variables.xml" />
1526 <title>See Also</title>
1528 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
1529 <citerefentry><refentrytitle>systemadm</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
1530 <citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
1531 <citerefentry><refentrytitle>loginctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
1532 <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
1533 <citerefentry><refentrytitle>systemd.resource-management</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
1534 <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
1535 <citerefentry><refentrytitle>wall</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
1536 <citerefentry><refentrytitle>systemd.preset</refentrytitle><manvolnum>5</manvolnum></citerefentry>
1537 <citerefentry><refentrytitle>glob</refentrytitle><manvolnum>7</manvolnum></citerefentry>