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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.special"> | |
25 | ||
26 | <refentryinfo> | |
27 | <title>systemd.special</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>systemd.special</refentrytitle> | |
42 | <manvolnum>7</manvolnum> | |
43 | </refmeta> | |
44 | ||
45 | <refnamediv> | |
46 | <refname>systemd.special</refname> | |
47 | <refpurpose>special systemd units</refpurpose> | |
48 | </refnamediv> | |
49 | ||
50 | <refsynopsisdiv> | |
9f2c5942 LP |
51 | <para><filename>basic.target</filename>, |
52 | <filename>ctrl-alt-del.target</filename>, | |
eeb7229c | 53 | <filename>@SPECIAL_DBUS_SERVICE@</filename>, |
9f2c5942 | 54 | <filename>default.target</filename>, |
1e287fe3 | 55 | <filename>display-manager.service</filename>, |
9f2c5942 | 56 | <filename>emergency.service</filename>, |
a1b256b0 | 57 | <filename>exit.service</filename>, |
9f2c5942 LP |
58 | <filename>graphical.target</filename>, |
59 | <filename>halt.target</filename>, | |
60 | <filename>kbrequest.target</filename>, | |
61 | <filename>local-fs.target</filename>, | |
683f468c | 62 | <filename>mail-transfer-agent.target</filename>, |
9f2c5942 LP |
63 | <filename>multi-user.target</filename>, |
64 | <filename>network.target</filename>, | |
65 | <filename>nss-lookup.target</filename>, | |
66 | <filename>poweroff.target</filename>, | |
67 | <filename>reboot.target</filename>, | |
68 | <filename>remote-fs.target</filename>, | |
69 | <filename>rescue.target</filename>, | |
70 | <filename>rpcbind.target</filename>, | |
71 | <filename>rtc-set.target</filename>, | |
9f2c5942 LP |
72 | <filename>runlevel2.target</filename>, |
73 | <filename>runlevel3.target</filename>, | |
74 | <filename>runlevel4.target</filename>, | |
75 | <filename>runlevel5.target</filename>, | |
9f2c5942 LP |
76 | <filename>shutdown.target</filename>, |
77 | <filename>sigpwr.target</filename>, | |
78 | <filename>sockets.target</filename>, | |
79 | <filename>swap.target</filename>, | |
f92a18f5 | 80 | <filename>sysinit.target</filename>, |
9f2c5942 | 81 | <filename>syslog.target</filename>, |
eeb7229c | 82 | <filename>@SPECIAL_SYSLOG_SERVICE@</filename>, |
9f2c5942 LP |
83 | <filename>systemd-initctl.service</filename>, |
84 | <filename>systemd-initctl.socket</filename>, | |
85 | <filename>systemd-logger.service</filename>, | |
86 | <filename>systemd-logger.socket</filename></para> | |
9f235308 LP |
87 | </refsynopsisdiv> |
88 | ||
89 | <refsect1> | |
90 | <title>Description</title> | |
91 | ||
92 | <para>A few units are treated specially by | |
93 | systemd. They have special internal semantics and | |
94 | cannot be renamed.</para> | |
95 | </refsect1> | |
96 | ||
97 | <refsect1> | |
98 | <title>Special System Units</title> | |
99 | ||
100 | <variablelist> | |
bd3d19a4 LP |
101 | <varlistentry> |
102 | <term><filename>basic.target</filename></term> | |
103 | <listitem> | |
104 | <para>A special target unit | |
105 | covering early boot-up.</para> | |
106 | <para>systemd automatically | |
107 | adds dependencies of the types | |
108 | Requires and After for this | |
109 | target unit to all SysV | |
110 | service units configured for | |
111 | runlevel 1 to 5.</para> | |
af62c704 KS |
112 | <para>Usually this should pull-in |
113 | all sockets, mount points, | |
f92a18f5 LP |
114 | swap devices and other basic |
115 | initialization necessary for | |
116 | the general purpose | |
af62c704 | 117 | daemons. Most normal daemons |
f92a18f5 LP |
118 | should have dependencies of |
119 | type After and Requires on | |
120 | this unit.</para> | |
bd3d19a4 LP |
121 | </listitem> |
122 | </varlistentry> | |
123 | <varlistentry> | |
124 | <term><filename>ctrl-alt-del.target</filename></term> | |
125 | <listitem> | |
126 | <para>systemd starts this | |
127 | target whenever | |
128 | Control+Alt+Del is pressed on | |
129 | the console. Usually this | |
130 | should be aliased (symlinked) | |
131 | to | |
132 | <filename>reboot.target</filename>.</para> | |
133 | </listitem> | |
134 | </varlistentry> | |
eeb7229c LP |
135 | <varlistentry> |
136 | <term><filename>@SPECIAL_DBUS_SERVICE@</filename></term> | |
137 | <listitem> | |
138 | <para>A special unit for the | |
139 | D-Bus system bus. As soon as | |
140 | this service is fully started | |
141 | up systemd will connect to it | |
142 | and register its | |
143 | service.</para> | |
144 | </listitem> | |
145 | </varlistentry> | |
bd3d19a4 LP |
146 | <varlistentry> |
147 | <term><filename>default.target</filename></term> | |
148 | <listitem> | |
149 | <para>The default unit systemd | |
150 | starts at bootup. Usually this | |
151 | should be aliased (symlinked) | |
152 | to | |
153 | <filename>multi-user.target</filename> | |
154 | or | |
155 | <filename>graphical.target</filename>.</para> | |
156 | <para>The default unit systemd | |
157 | starts at bootup can be | |
158 | overriden with the | |
159 | <varname>systemd.default=</varname> | |
160 | kernel command line option.</para> | |
161 | </listitem> | |
162 | </varlistentry> | |
1e287fe3 LP |
163 | <varlistentry> |
164 | <term><filename>display-manager.service</filename></term> | |
165 | <listitem> | |
166 | <para>The display manager | |
167 | service. Usually this should | |
168 | be aliased (symlinked) to | |
af62c704 | 169 | <filename>xdm.service</filename> |
1e287fe3 LP |
170 | or a similar display manager |
171 | service.</para> | |
172 | <para>systemd automatically | |
173 | adds dependencies of type | |
174 | After for this target unit to | |
175 | all SysV init script service | |
af62c704 | 176 | units with a LSB header |
1e287fe3 LP |
177 | referring to the |
178 | <literal>$x-display-manager</literal> | |
179 | facility, for compatibility | |
180 | with Debian.</para> | |
181 | </listitem> | |
182 | </varlistentry> | |
9f235308 LP |
183 | <varlistentry> |
184 | <term><filename>emergency.service</filename></term> | |
185 | <listitem> | |
186 | <para>A special service unit | |
187 | that starts an emergency | |
188 | shell on the main | |
189 | console. This unit is supposed | |
190 | to be used with the kernel | |
191 | command line option | |
192 | <varname>systemd.default=</varname> | |
193 | and has otherwise little use. | |
194 | </para> | |
195 | </listitem> | |
196 | </varlistentry> | |
bd3d19a4 LP |
197 | <varlistentry> |
198 | <term><filename>graphical.target</filename></term> | |
199 | <listitem> | |
200 | <para>A special target unit | |
201 | for setting up a graphical | |
202 | login screen. This pulls in | |
203 | <filename>multi-user.target</filename>.</para> | |
204 | ||
205 | <para>Units that are needed | |
206 | for graphical login shall add | |
207 | Wants dependencies for their | |
208 | unit to this unit (or | |
209 | <filename>multi-user.target</filename>) | |
210 | during installation.</para> | |
211 | </listitem> | |
212 | </varlistentry> | |
213 | <varlistentry> | |
214 | <term><filename>halt.target</filename></term> | |
215 | <listitem> | |
216 | <para>A special target unit | |
217 | for shutting down and halting the system.</para> | |
218 | ||
219 | <para>Applications wanting to | |
220 | halt the system should start | |
221 | this unit.</para> | |
222 | </listitem> | |
223 | </varlistentry> | |
224 | <varlistentry> | |
225 | <term><filename>kbrequest.target</filename></term> | |
226 | <listitem> | |
227 | <para>systemd starts this | |
228 | target whenever Alt+ArrowUp is | |
229 | pressed on the console. This | |
230 | is a good candidate to be | |
231 | aliased (symlinked) to | |
232 | <filename>rescue.target</filename>.</para> | |
233 | </listitem> | |
234 | </varlistentry> | |
9f235308 LP |
235 | <varlistentry> |
236 | <term><filename>local-fs.target</filename></term> | |
237 | <listitem> | |
238 | <para>systemd automatically | |
239 | adds dependencies of type | |
240 | After to all mount units that | |
bd3d19a4 LP |
241 | refer to local mount points |
242 | for this target unit. In | |
243 | addition, systemd adds | |
244 | dependencies of type Wants to | |
245 | this target unit for those | |
246 | mounts listed in | |
9f235308 LP |
247 | <filename>/etc/fstab</filename> |
248 | that have the | |
0d624a78 LP |
249 | <option>auto</option> and |
250 | <option>comment=systemd.mount</option> | |
9f235308 LP |
251 | mount options set.</para> |
252 | ||
253 | <para>systemd automatically | |
254 | adds dependencies of type | |
bd3d19a4 LP |
255 | After for this target unit to |
256 | all SysV init script service | |
257 | units with an LSB header | |
258 | referring to the | |
9f235308 LP |
259 | <literal>$local_fs</literal> |
260 | facility.</para> | |
261 | </listitem> | |
262 | </varlistentry> | |
683f468c LP |
263 | <varlistentry> |
264 | <term><filename>mail-transfer-agent.target</filename></term> | |
265 | <listitem> | |
266 | <para>The mail transfer agent | |
267 | (MTA) service. Usually this | |
af62c704 | 268 | should pull-in all units |
683f468c LP |
269 | necessary for |
270 | sending/receiving mails on the | |
271 | local host.</para> | |
272 | ||
273 | <para>systemd automatically | |
274 | adds dependencies of type | |
275 | After for this target unit to | |
276 | all SysV init script service | |
277 | units with an LSB header | |
278 | referring to the | |
279 | <literal>$mail-transfer-argent</literal> | |
280 | or | |
281 | <literal>$mail-transport-agent</literal> | |
282 | facilities, for compatibility | |
283 | with Debian.</para> | |
284 | </listitem> | |
285 | </varlistentry> | |
bd3d19a4 LP |
286 | <varlistentry> |
287 | <term><filename>multi-user.target</filename></term> | |
288 | <listitem> | |
289 | <para>A special target unit | |
290 | for setting up a multi-user | |
291 | system (non-graphical). This | |
292 | is pulled in by | |
293 | <filename>graphical.target</filename>.</para> | |
294 | ||
295 | <para>Units that are needed | |
296 | for a multi-user system shall | |
297 | add Wants dependencies to | |
298 | this unit for their unit during | |
299 | installation.</para> | |
300 | </listitem> | |
301 | </varlistentry> | |
9f235308 LP |
302 | <varlistentry> |
303 | <term><filename>network.target</filename></term> | |
304 | <listitem> | |
305 | <para>systemd automatically | |
306 | adds dependencies of type | |
bd3d19a4 LP |
307 | After for this target unit to |
308 | all SysV init script service | |
309 | units with an LSB header | |
310 | referring to the | |
9f235308 LP |
311 | <literal>$network</literal> |
312 | facility.</para> | |
313 | </listitem> | |
314 | </varlistentry> | |
315 | <varlistentry> | |
316 | <term><filename>nss-lookup.target</filename></term> | |
317 | <listitem> | |
318 | <para>systemd automatically | |
319 | adds dependencies of type | |
bd3d19a4 LP |
320 | After for this target unit to |
321 | all SysV init script service | |
322 | units with an LSB header | |
323 | referring to the | |
9f235308 LP |
324 | <literal>$named</literal> |
325 | facility.</para> | |
326 | </listitem> | |
327 | </varlistentry> | |
bd3d19a4 LP |
328 | <varlistentry> |
329 | <term><filename>poweroff.target</filename></term> | |
330 | <listitem> | |
331 | <para>A special target unit | |
332 | for shutting down and powering off the system.</para> | |
333 | ||
334 | <para>Applications wanting to | |
335 | power off the system should start | |
336 | this unit.</para> | |
337 | ||
338 | <para><filename>runlevel0.target</filename> | |
339 | is an alias for this target | |
340 | unit, for compatibility with SysV.</para> | |
341 | </listitem> | |
342 | </varlistentry> | |
343 | <varlistentry> | |
344 | <term><filename>reboot.target</filename></term> | |
345 | <listitem> | |
346 | <para>A special target unit | |
347 | for shutting down and rebooting the system.</para> | |
348 | ||
349 | <para>Applications wanting to | |
350 | reboot the system should start | |
351 | this unit.</para> | |
352 | ||
353 | <para><filename>runlevel6.target</filename> | |
354 | is an alias for this target | |
355 | unit, for compatibility with SysV.</para> | |
356 | </listitem> | |
357 | </varlistentry> | |
9f235308 LP |
358 | <varlistentry> |
359 | <term><filename>remote-fs.target</filename></term> | |
360 | <listitem> | |
bd3d19a4 LP |
361 | <para>Similar to |
362 | <filename>local-fs.target</filename>, | |
363 | but for remote mount | |
364 | points.</para> | |
365 | ||
9f235308 LP |
366 | <para>systemd automatically |
367 | adds dependencies of type | |
bd3d19a4 LP |
368 | After for this target unit to |
369 | all SysV init script service | |
370 | units with an LSB header | |
371 | referring to the | |
1e89ced1 | 372 | <literal>$remote_fs</literal> |
9f235308 LP |
373 | facility.</para> |
374 | </listitem> | |
375 | </varlistentry> | |
bd3d19a4 LP |
376 | <varlistentry> |
377 | <term><filename>rescue.target</filename></term> | |
378 | <listitem> | |
379 | <para>A special target unit | |
380 | for setting up the base system | |
381 | and a rescue shell.</para> | |
382 | ||
383 | <para><filename>runlevel1.target</filename> | |
384 | is an alias for this target | |
385 | unit, for compatibility with SysV.</para> | |
386 | </listitem> | |
387 | </varlistentry> | |
9f235308 LP |
388 | <varlistentry> |
389 | <term><filename>rpcbind.target</filename></term> | |
390 | <listitem> | |
391 | <para>systemd automatically | |
392 | adds dependencies of type | |
bd3d19a4 LP |
393 | After for this target unit to |
394 | all SysV init script service | |
395 | units with an LSB header | |
396 | referring to the | |
9f235308 LP |
397 | <literal>$rpcbind</literal> |
398 | facility.</para> | |
399 | </listitem> | |
400 | </varlistentry> | |
401 | <varlistentry> | |
402 | <term><filename>rtc-set.target</filename></term> | |
403 | <listitem> | |
404 | <para>systemd automatically | |
405 | adds dependencies of type | |
bd3d19a4 LP |
406 | After for this target unit to |
407 | all SysV init script service | |
408 | units with an LSB header | |
409 | referring to the | |
9f235308 LP |
410 | <literal>$time</literal> |
411 | facility.</para> | |
412 | </listitem> | |
413 | </varlistentry> | |
bd3d19a4 LP |
414 | <varlistentry> |
415 | <term><filename>runlevel2.target</filename></term> | |
416 | <listitem> | |
417 | <para>This is a target that is | |
418 | called whever the SysV | |
419 | compatibility code asks for | |
420 | runlevel 2. It is a good idea | |
421 | to make this an alias for | |
422 | (i.e. symlink to) | |
423 | <filename>multi-user.target</filename>.</para> | |
424 | </listitem> | |
425 | </varlistentry> | |
426 | <varlistentry> | |
427 | <term><filename>runlevel3.target</filename></term> | |
428 | <listitem> | |
429 | <para>This is a target that is | |
430 | called whever the SysV | |
431 | compatibility code asks for | |
432 | runlevel 3. It is a good idea | |
433 | to make this an alias for | |
434 | (i.e. symlink to) | |
435 | <filename>multi-user.target</filename> | |
436 | or | |
437 | <filename>graphical.target</filename>.</para> | |
438 | </listitem> | |
439 | </varlistentry> | |
440 | <varlistentry> | |
441 | <term><filename>runlevel4.target</filename></term> | |
442 | <listitem> | |
443 | <para>This is a target that is | |
444 | called whever the SysV | |
445 | compatibility code asks for | |
446 | runlevel 4. It is a good idea | |
447 | to make this an alias for | |
448 | (i.e. symlink to) | |
449 | <filename>multi-user.target</filename> | |
450 | or | |
451 | <filename>graphical.target</filename>.</para> | |
452 | </listitem> | |
453 | </varlistentry> | |
454 | <varlistentry> | |
455 | <term><filename>runlevel5.target</filename></term> | |
456 | <listitem> | |
457 | <para>This is a target that is | |
458 | called whever the SysV | |
459 | compatibility code asks for | |
460 | runlevel 5. It is a good idea | |
461 | to make this an alias for | |
462 | (i.e. symlink to) | |
463 | <filename>multi-user.target</filename> | |
464 | or | |
465 | <filename>graphical.target</filename>.</para> | |
466 | </listitem> | |
467 | </varlistentry> | |
9f235308 LP |
468 | <varlistentry> |
469 | <term><filename>shutdown.target</filename></term> | |
470 | <listitem> | |
471 | <para>A special target unit | |
472 | that terminates the services | |
473 | on system shutdown.</para> | |
474 | ||
475 | <para>Services that shall be | |
476 | terminated on system shutdown | |
bd3d19a4 LP |
477 | shall add Conflicts |
478 | dependencies to this unit for | |
479 | their service unit during | |
9f235308 LP |
480 | installation.</para> |
481 | ||
482 | <para>systemd automatically | |
483 | adds dependencies of type | |
484 | Conflicts to this target unit | |
bd3d19a4 LP |
485 | for all SysV init script |
486 | service units that shall be | |
487 | terminated in SysV runlevels 0 | |
488 | or 6.</para> | |
9f235308 LP |
489 | </listitem> |
490 | </varlistentry> | |
491 | <varlistentry> | |
492 | <term><filename>sigpwr.target</filename></term> | |
493 | <listitem> | |
494 | <para>A special target that is | |
495 | started when systemd receives | |
496 | the SIGPWR process signal, | |
497 | which is normally sent by the | |
bd3d19a4 | 498 | kernel or UPS daemons when |
9f235308 LP |
499 | power fails.</para> |
500 | </listitem> | |
501 | </varlistentry> | |
502 | <varlistentry> | |
503 | <term><filename>sockets.target</filename></term> | |
504 | <listitem> | |
505 | <para>A special target unit | |
506 | that sets up all service | |
507 | sockets.</para> | |
508 | ||
509 | <para>Services that can be | |
510 | socket-activated shall add | |
bd3d19a4 LP |
511 | Wants dependencies to this |
512 | unit for their socket unit | |
9f235308 LP |
513 | during installation.</para> |
514 | </listitem> | |
515 | </varlistentry> | |
516 | <varlistentry> | |
517 | <term><filename>swap.target</filename></term> | |
518 | <listitem> | |
519 | <para>Similar to | |
520 | <filename>local-fs.target</filename>, but for swap | |
521 | partitions and swap | |
522 | files.</para> | |
523 | </listitem> | |
524 | </varlistentry> | |
525 | <varlistentry> | |
526 | <term><filename>syslog.target</filename></term> | |
527 | <listitem> | |
528 | <para>systemd automatically | |
529 | adds dependencies of type | |
bd3d19a4 LP |
530 | After for this target unit to |
531 | all SysV init script service | |
532 | units with an LSB header | |
533 | referring to the | |
9f235308 LP |
534 | <literal>$syslog</literal> |
535 | facility.</para> | |
536 | ||
537 | <para>Administrators should | |
538 | ensure that this target pulls | |
539 | in a service unit with the | |
540 | name or alias of | |
bd3d19a4 LP |
541 | <filename>@SPECIAL_SYSLOG_SERVICE@</filename> |
542 | (or a socket unit that | |
543 | activates this | |
544 | service).</para> | |
9f235308 LP |
545 | </listitem> |
546 | </varlistentry> | |
f92a18f5 LP |
547 | <varlistentry> |
548 | <term><filename>sysinit.target</filename></term> | |
549 | <listitem> | |
550 | <para>A special target unit | |
551 | covering early boot-up scripts.</para> | |
552 | <para>systemd automatically | |
553 | adds dependencies of the types | |
554 | Wants and After for all | |
555 | SysV service units configured | |
556 | for runlevels that are not 0 | |
557 | to 6 to this target unit. | |
558 | This covers the special | |
559 | boot-up runlevels some | |
560 | distributions have, such as S | |
561 | or b.</para> | |
562 | </listitem> | |
563 | </varlistentry> | |
eeb7229c LP |
564 | <varlistentry> |
565 | <term><filename>@SPECIAL_SYSLOG_SERVICE@</filename></term> | |
566 | <listitem> | |
567 | <para>A special unit for the | |
568 | syslog daemon. As soon as | |
569 | this service is fully started | |
570 | up systemd will connect to it | |
571 | and use it for logging if it | |
572 | has been configured for | |
573 | that.</para> | |
574 | <para>Applications should | |
575 | generally not depend on this | |
576 | service, and depend on | |
577 | <filename>syslog.target</filename> | |
578 | instead.</para> | |
579 | </listitem> | |
580 | </varlistentry> | |
9f235308 LP |
581 | <varlistentry> |
582 | <term><filename>systemd-initctl.service</filename></term> | |
583 | <listitem> | |
584 | <para>This provides | |
585 | compatibility with the SysV | |
586 | /dev/initctl file system FIFO | |
587 | for communication with the | |
588 | init system.</para> | |
589 | <para>This is a | |
590 | socket-activated service, see | |
591 | <filename>system-initctl.socket</filename>.</para> | |
592 | </listitem> | |
593 | </varlistentry> | |
594 | <varlistentry> | |
595 | <term><filename>systemd-initctl.socket</filename></term> | |
596 | <listitem> | |
597 | <para>Socket activation unit | |
598 | for | |
599 | <filename>system-initctl.service</filename>.</para> | |
600 | </listitem> | |
601 | </varlistentry> | |
602 | <varlistentry> | |
603 | <term><filename>systemd-logger.service</filename></term> | |
604 | <listitem> | |
bd3d19a4 | 605 | <para>This is internally used |
9f235308 | 606 | by systemd to provide syslog |
bd3d19a4 LP |
607 | logging to the processes it |
608 | maintains.</para> | |
9f235308 LP |
609 | <para>This is a |
610 | socket-activated service, see | |
611 | <filename>system-logger.socket</filename>.</para> | |
612 | </listitem> | |
613 | </varlistentry> | |
614 | <varlistentry> | |
615 | <term><filename>systemd-logger.socket</filename></term> | |
616 | <listitem> | |
617 | <para>Socket activation unit | |
618 | for | |
bd3d19a4 LP |
619 | <filename>system-logger.service</filename>. systemd |
620 | will automatically add | |
621 | dependencies of types Requires | |
622 | and After to all units that | |
623 | have been configured for | |
624 | stdout or stderr to be | |
625 | connected to syslog or the | |
626 | kernel log buffer.</para> | |
9f235308 LP |
627 | </listitem> |
628 | </varlistentry> | |
629 | </variablelist> | |
630 | </refsect1> | |
631 | ||
632 | <refsect1> | |
633 | <title>Special Session Units</title> | |
634 | ||
635 | <para>When systemd runs as a service instance, the | |
636 | following special units are available, which have | |
637 | similar definitions as their system counterparts: | |
bd3d19a4 | 638 | <filename>default.target</filename>, |
9f235308 LP |
639 | <filename>local-fs.target</filename>, |
640 | <filename>remote-fs.target</filename>, | |
641 | <filename>shutdown.target</filename>, | |
642 | <filename>sockets.target</filename>, | |
643 | <filename>swap.target</filename>.</para> | |
a1b256b0 LP |
644 | |
645 | <para>In addition the following special unit is | |
646 | understood only when systemd runs as service instance:</para> | |
647 | ||
648 | <variablelist> | |
649 | <varlistentry> | |
650 | <term><filename>exit.service</filename></term> | |
651 | <listitem> | |
652 | <para>A special service unit | |
653 | for shutting down the | |
654 | session.</para> | |
655 | ||
656 | <para>Applications wanting to | |
657 | terminate the session should | |
658 | start this unit. If systemd | |
659 | receives SIGTERM or SIGINT | |
660 | when running as session daemon | |
661 | it will start this | |
662 | unit.</para> | |
663 | ||
664 | <para>Normally, this pulls in | |
665 | <filename>shutdown.target</filename> | |
666 | which in turn should be | |
667 | conflicted by all units that | |
668 | want to be shut down on | |
669 | session exit.</para> | |
670 | </listitem> | |
671 | </varlistentry> | |
672 | </variablelist> | |
9f235308 LP |
673 | </refsect1> |
674 | ||
675 | <refsect1> | |
676 | <title>See Also</title> | |
677 | <para> | |
678 | <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
679 | <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
680 | <citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
681 | <citerefentry><refentrytitle>systemd.target</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
682 | </para> | |
683 | </refsect1> | |
684 | ||
685 | </refentry> |