man/systemctl.xml

   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">
   4
   5 <!--
   6   This file is part of systemd.
   7
   8   Copyright 2010 Lennart Poettering
   9
  10   systemd is free software; you can redistribute it and/or modify it
  11   under the terms of the GNU General Public License as published by
  12   the Free Software Foundation; either version 2 of the License, or
  13   (at your option) any later version.
  14
  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   General Public License for more details.
  19
  20   You should have received a copy of the GNU General Public License
  21   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  22 -->
  23
  24 <refentry id="systemd-install">
  25
  26         <refentryinfo>
  27                 <title>systemctl</title>
  28                 <productname>systemd</productname>
  29
  30                 <authorgroup>
  31                         <author>
  32                                 <contrib>Developer</contrib>
  33                                 <firstname>Lennart</firstname>
  34                                 <surname>Poettering</surname>
  35                                 <email>lennart@poettering.net</email>
  36                         </author>
  37                 </authorgroup>
  38         </refentryinfo>
  39
  40         <refmeta>
  41                 <refentrytitle>systemctl</refentrytitle>
  42                 <manvolnum>1</manvolnum>
  43         </refmeta>
  44
  45         <refnamediv>
  46                 <refname>systemctl</refname>
  47                 <refpurpose>Control the systemd system and session manager</refpurpose>
  48         </refnamediv>
  49
  50         <refsynopsisdiv>
  51                 <cmdsynopsis>
  52                         <command>systemctl <arg choice="opt" rep="repeat">OPTIONS</arg> <arg choice="req">COMMAND</arg> <arg choice="opt" rep="repeat">NAME</arg></command>
  53                 </cmdsynopsis>
  54         </refsynopsisdiv>
  55
  56         <refsect1>
  57                 <title>Description</title>
  58
  59                 <para><command>systemctl</command> may be used to
  60                 introspect and control the state of the
  61                 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
  62                 system and session manager.</para>
  63         </refsect1>
  64
  65         <refsect1>
  66                 <title>Options</title>
  67
  68                 <para>The following options are understood:</para>
  69
  70                 <variablelist>
  71                         <varlistentry>
  72                                 <term><option>--help</option></term>
  73                                 <term><option>-h</option></term>
  74
  75                                 <listitem><para>Prints a short help
  76                                 text and exits.</para></listitem>
  77                         </varlistentry>
  78
  79                         <varlistentry>
  80                                 <term><option>--type=</option></term>
  81                                 <term><option>-t</option></term>
  82
  83                                 <listitem><para>When listing units,
  84                                 limit display to certain unit
  85                                 types. If not specified units of all
  86                                 types will be shown. The argument
  87                                 should be a unit type name such as
  88                                 <option>service</option>,
  89                                 <option>socket</option> and
  90                                 similar.</para></listitem>
  91                         </varlistentry>
  92
  93                         <varlistentry>
  94                                 <term><option>--property=</option></term>
  95                                 <term><option>-p</option></term>
  96
  97                                 <listitem><para>When showing
  98                                 unit/job/manager information, limit
  99                                 display to certain property names. If
 100                                 not specified all set properties are
 101                                 shown. The argument should be a
 102                                 property name, such as
 103                                 <literal>MainPID</literal>.</para></listitem>
 104                         </varlistentry>
 105
 106                         <varlistentry>
 107                                 <term><option>--all</option></term>
 108                                 <term><option>-a</option></term>
 109
 110                                 <listitem><para>When listing units,
 111                                 show all units, regardless of their
 112                                 state, including inactive units. When
 113                                 showing unit/job/manager information,
 114                                 show all properties regardless whether
 115                                 they are set or not.</para></listitem>
 116                         </varlistentry>
 117
 118                         <varlistentry>
 119                                 <term><option>--replace</option></term>
 120
 121                                 <listitem><para>If the requested
 122                                 operation conflicts with an existing
 123                                 unfinished operation, replace the
 124                                 existing operation by the requested
 125                                 operation. If this is not specified
 126                                 the requested operation will
 127                                 fail.</para></listitem>
 128                         </varlistentry>
 129
 130                         <varlistentry>
 131                                 <term><option>--system</option></term>
 132
 133                                 <listitem><para>Talk to the systemd
 134                                 system manager. (Default)</para></listitem>
 135                         </varlistentry>
 136
 137                         <varlistentry>
 138                                 <term><option>--session</option></term>
 139
 140                                 <listitem><para>Talk to the systemd
 141                                 session manager of the calling user.</para></listitem>
 142                         </varlistentry>
 143
 144                         <varlistentry>
 145                                 <term><option>--no-block</option></term>
 146
 147                                 <listitem><para>Do not synchronously wait for
 148                                 the requested operation to finish. If this is
 149                                 not specified the job will be verified,
 150                                 enqueued and <command>systemctl</command> will
 151                                 wait until it is completed. By passing this
 152                                 argument it is only verified and
 153                                 enqueued.</para></listitem> </varlistentry>
 154
 155                         <varlistentry>
 156                                 <term><option>--quiet</option></term>
 157                                 <term><option>-q</option></term>
 158
 159                                 <listitem><para>Suppress output to
 160                                 STDOUT for <command>snapshot</command>
 161                                 and
 162                                 <command>check</command>.</para></listitem>
 163                         </varlistentry>
 164
 165                         <varlistentry>
 166                                 <term><option>--no-wall</option></term>
 167
 168                                 <listitem><para>Don't send wall
 169                                 message before
 170                                 halt, power-off, reboot.</para></listitem>
 171                         </varlistentry>
 172                 </variablelist>
 173
 174                 <para>The following commands are understood:</para>
 175
 176                 <variablelist>
 177                         <varlistentry>
 178                                 <term><command>list-units</command></term>
 179
 180                                 <listitem><para>List known units.</para></listitem>
 181                         </varlistentry>
 182                         <varlistentry>
 183                                 <term><command>start [NAME...]</command></term>
 184
 185                                 <listitem><para>Start one or more
 186                                 units specified on the command
 187                                 line.</para></listitem>
 188                         </varlistentry>
 189                         <varlistentry>
 190                                 <term><command>stop [NAME...]</command></term>
 191
 192                                 <listitem><para>Stop one or more units
 193                                 specified on the command
 194                                 line.</para></listitem>
 195                         </varlistentry>
 196                         <varlistentry>
 197                                 <term><command>restart [NAME...]</command></term>
 198
 199                                 <listitem><para>Restart one or more
 200                                 units specified on the command
 201                                 line.</para></listitem>
 202                         </varlistentry>
 203                         <varlistentry>
 204                                 <term><command>reload [NAME...]</command></term>
 205
 206                                 <listitem><para>Asks all services
 207                                 whose units are listed on the command
 208                                 line to reload their
 209                                 configuration. Note that this will
 210                                 reload the daemon configuration
 211                                 itself, not the unit configuration
 212                                 file of systemd. If you want systemd
 213                                 to reload the configuration file of a
 214                                 unit use the
 215                                 <command>daemon-reload</command>
 216                                 command. In other words: for the
 217                                 example case of Apache, this will
 218                                 reload Apache's
 219                                 <filename>httpd.conf</filename> in the
 220                                 web server, not the
 221                                 <filename>apache.service</filename>
 222                                 systemd unit file. </para> <para>This
 223                                 command should not be confused with
 224                                 the <command>daemon-reload</command>
 225                                 or <command>load</command>
 226                                 commands.</para></listitem>
 227
 228                         </varlistentry>
 229                         <varlistentry>
 230                                 <term><command>isolate [NAME]</command></term>
 231
 232                                 <listitem><para>Start the unit
 233                                 specified on the command line and its
 234                                 dependencies and stop all
 235                                 others.</para></listitem>
 236                         </varlistentry>
 237                         <varlistentry>
 238                                 <term><command>check [NAME...]</command></term>
 239
 240                                 <listitem><para>Check whether any of
 241                                 the specified units is active
 242                                 (i.e. running). Returns 0 if at least
 243                                 one is active, non-zero
 244                                 otherwise. Unless
 245                                 <option>--quiet</option> is specified
 246                                 this will also print the current unit
 247                                 state to STDOUT.</para></listitem>
 248                         </varlistentry>
 249                         <varlistentry>
 250                                 <term><command>show [NAME...|JOB...]</command></term>
 251
 252                                 <listitem><para>Show information about
 253                                 one or more units, jobs or the manager
 254                                 itself. If no argument is specified
 255                                 information about the manager will be
 256                                 shown. If a unit name is specified
 257                                 information about the unit is shown,
 258                                 and if a job id is specified
 259                                 information about the job is
 260                                 shown.</para></listitem>
 261                         </varlistentry>
 262                         <varlistentry>
 263                                 <term><command>load [NAME...]</command></term>
 264
 265                                 <listitem><para>Load one or more units
 266                                 specified on the command line. This
 267                                 will simply load their configuration
 268                                 from disk, but not start them. To
 269                                 start them you need to use the
 270                                 <command>start</command> command which
 271                                 will implicitly load a unit that has
 272                                 not been loaded yet. Note that systemd
 273                                 garbage collects loaded units that are
 274                                 not active or referenced by an active
 275                                 unit. This means that units loaded
 276                                 this way will usually not stay loaded
 277                                 for long. Also note that this command
 278                                 cannot be used to reload unit
 279                                 configuration. Use the
 280                                 <command>daemon-reload</command>
 281                                 command for that. All in all, this
 282                                 command is of little use except for
 283                                 debugging.</para>
 284                                 <para>This command should not be
 285                                 confused with the
 286                                 <command>daemon-reload</command> or
 287                                 <command>reload</command>
 288                                 commands.</para></listitem>
 289                         </varlistentry>
 290                         <varlistentry>
 291                                 <term><command>list-jobs</command></term>
 292
 293                                 <listitem><para>List jobs that are in progress.</para></listitem>
 294                         </varlistentry>
 295                         <varlistentry>
 296                                 <term><command>cancel [JOB...]</command></term>
 297
 298                                 <listitem><para>Cancel one or more
 299                                 jobs specified on the command line by
 300                                 their numeric job
 301                                 IDs.</para></listitem>
 302                         </varlistentry>
 303                         <varlistentry>
 304                                 <term><command>clear-jobs</command></term>
 305
 306                                 <listitem><para>Cancel all jobs that are in progress.</para></listitem>
 307                         </varlistentry>
 308                         <varlistentry>
 309                                 <term><command>monitor</command></term>
 310
 311                                 <listitem><para>Monitor unit/job
 312                                 changes. This is mostly useful for
 313                                 debugging purposes and prints a line
 314                                 each time systemd loads or unloads a
 315                                 unit configuration file, or a unit
 316                                 property changes.</para></listitem>
 317                         </varlistentry>
 318                         <varlistentry>
 319                                 <term><command>dump</command></term>
 320
 321                                 <listitem><para>Dump server
 322                                 status. This will output a (usually
 323                                 very long) human readable manager
 324                                 status dump. Its format is subject to
 325                                 change without notice and should not
 326                                 be parsed by
 327                                 applications.</para></listitem>
 328                         </varlistentry>
 329                         <varlistentry>
 330                                 <term><command>snapshot [NAME]</command></term>
 331
 332                                 <listitem><para>Create a snapshot. If
 333                                 a snapshot name is specified, the new
 334                                 snapshot will be named after it. If
 335                                 none is specified an automatic
 336                                 snapshot name is generated. In either
 337                                 case, the snapshot name used is
 338                                 printed to STDOUT, unless
 339                                 <option>--quiet</option> is
 340                                 specified.</para>
 341
 342                                 <para>A snapshot refers to a saved
 343                                 state of the systemd manager. It is
 344                                 implemented itself as unit that is
 345                                 generated dynamically with this
 346                                 command and has dependencies on all
 347                                 units active at the time. At a later
 348                                 time the user may return to this state
 349                                 by using the
 350                                 <command>isolate</command> command on
 351                                 the snapshot unit.</para></listitem>
 352
 353                                 <para>Snapshots are only useful for
 354                                 saving and restoring which units are
 355                                 running or are stopped, they do not
 356                                 save/restore any other
 357                                 state. Snapshots are dynamic and lost
 358                                 on reboot.</para>
 359                         </varlistentry>
 360                         <varlistentry>
 361                                 <term><command>delete [NAME...]</command></term>
 362
 363                                 <listitem><para>Remove a snapshot
 364                                 previously created with
 365                                 <command>snapshot</command>.</para></listitem>
 366                         </varlistentry>
 367                         <varlistentry>
 368                                 <term><command>daemon-reload</command></term>
 369
 370                                 <listitem><para>Reload systemd manager
 371                                 configuration. This will reload all
 372                                 unit files and recreate the entire
 373                                 dependency tree. While the daemon is
 374                                 reloaded, all sockets systemd listens
 375                                 on on behalf of user configuration, will
 376                                 stay accessible.</para> <para>This
 377                                 command should not be confused with
 378                                 the <command>load</command> or
 379                                 <command>reload</command>
 380                                 commands.</para></listitem>
 381                         </varlistentry>
 382                         <varlistentry>
 383                                 <term><command>daemon-reexec</command></term>
 384
 385                                 <listitem><para>Reexecute the systemd
 386                                 manager. This will serialize the
 387                                 manager state, reexecute the process
 388                                 and deserialize the state again. This
 389                                 command is of little use except for
 390                                 debugging and package
 391                                 upgrades. Sometimes it might be
 392                                 helpful as a heavy-weight
 393                                 <command>daemon-reload</command>. While
 394                                 the daemon is reexecuted all sockets
 395                                 systemd listens on on behalf of user
 396                                 configuration will stay
 397                                 accessible.</para></listitem>
 398                         </varlistentry>
 399                         <varlistentry>
 400                                 <term><command>daemon-exit</command></term>
 401
 402                                 <listitem><para>Ask the systemd
 403                                 manager to quit. This is only
 404                                 supported for session managers
 405                                 (i.e. in conjunction with the
 406                                 <option>--session</option> option) and
 407                                 will fail otherwise.</para></listitem>
 408                         </varlistentry>
 409                         <varlistentry>
 410                                 <term><command>show-environment</command></term>
 411
 412                                 <listitem><para>Dump the systemd
 413                                 manager environment block. The
 414                                 environment block will be dumped in
 415                                 straight-forward form suitable for
 416                                 sourcing into a shell script. This
 417                                 environment block will be passed to
 418                                 all processes the manager
 419                                 spawns.</para></listitem>
 420                         </varlistentry>
 421                         <varlistentry>
 422                                 <term><command>set-environment [NAME=VALUE...]</command></term>
 423
 424                                 <listitem><para>Set one or more
 425                                 systemd manager environment variables,
 426                                 as specified on the command
 427                                 line.</para></listitem>
 428                         </varlistentry>
 429                         <varlistentry>
 430                                 <term><command>unset-environment [NAME...]</command></term>
 431
 432                                 <listitem><para>Unset one or more
 433                                 systemd manager environment
 434                                 variables. If only a variable name is
 435                                 specified it will be removed
 436                                 regardless of its value. If a variable
 437                                 and a value are specified the variable
 438                                 is only removed if it has the
 439                                 specified value.</para></listitem>
 440                         </varlistentry>
 441
 442                         <varlistentry>
 443                                 <term><command>halt</command></term>
 444
 445                                 <listitem><para>Shut down and halt the
 446                                 system. This is mostly equivalent to
 447                                 <command>start halt.target</command>
 448                                 but also prints a wall message to all
 449                                 users.</para></listitem>
 450                         </varlistentry>
 451                         <varlistentry>
 452                                 <term><command>poweroff</command></term>
 453
 454                                 <listitem><para>Shut down and
 455                                 power-off the system. This is mostly
 456                                 equivalent to <command>start
 457                                 poweroff.target</command> but also
 458                                 prints a wall message to all
 459                                 users.</para></listitem>
 460                         </varlistentry>
 461                         <varlistentry>
 462                                 <term><command>reboot</command></term>
 463
 464                                 <listitem><para>Shut down and
 465                                 reboot the system. This is mostly
 466                                 equivalent to <command>start
 467                                 reboot.target</command> but also
 468                                 prints a wall message to all
 469                                 users.</para></listitem>
 470                         </varlistentry>
 471                         <varlistentry>
 472                                 <term><command>default</command></term>
 473
 474                                 <listitem><para>Enter default
 475                                 mode. This is mostly equivalent to
 476                                 <command>start
 477                                 default.target</command>.</para></listitem>
 478                         </varlistentry>
 479                         <varlistentry>
 480                                 <term><command>rescue</command></term>
 481
 482                                 <listitem><para>Enter rescue
 483                                 mode. This is mostly equivalent to
 484                                 <command>isolate
 485                                 rescue.target</command> but also
 486                                 prints a wall message to all
 487                                 users.</para></listitem>
 488                         </varlistentry>
 489                         <varlistentry>
 490                                 <term><command>emergency</command></term>
 491
 492                                 <listitem><para>Enter emergency
 493                                 mode. This is mostly equivalent to
 494                                 <command>isolate
 495                                 emergency.service</command> but also
 496                                 prints a wall message to all
 497                                 users.</para></listitem>
 498                         </varlistentry>
 499                 </variablelist>
 500
 501         </refsect1>
 502
 503         <refsect1>
 504                 <title>Exit status</title>
 505
 506                 <para>On success 0 is returned, a non-zero failure
 507                 code otherwise.</para>
 508         </refsect1>
 509
 510         <refsect1>
 511                 <title>See Also</title>
 512                 <para>
 513                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 514                         <citerefentry><refentrytitle>systemadm</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 515                         <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 516                         <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
 517                         <citerefentry><refentrytitle>wall</refentrytitle><manvolnum>1</manvolnum></citerefentry>
 518                 </para>
 519         </refsect1>
 520
 521 </refentry>