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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>, | |
83bda358 | 53 | <filename>dbus.service</filename>, |
9f2c5942 | 54 | <filename>default.target</filename>, |
1e287fe3 | 55 | <filename>display-manager.service</filename>, |
f057408c | 56 | <filename>emergency.target</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>, | |
21e557ed | 62 | <filename>local-fs-pre.target</filename>, |
683f468c | 63 | <filename>mail-transfer-agent.target</filename>, |
9f2c5942 LP |
64 | <filename>multi-user.target</filename>, |
65 | <filename>network.target</filename>, | |
66 | <filename>nss-lookup.target</filename>, | |
67 | <filename>poweroff.target</filename>, | |
68 | <filename>reboot.target</filename>, | |
69 | <filename>remote-fs.target</filename>, | |
21e557ed | 70 | <filename>remote-fs-pre.target</filename>, |
9f2c5942 LP |
71 | <filename>rescue.target</filename>, |
72 | <filename>rpcbind.target</filename>, | |
9f2c5942 LP |
73 | <filename>runlevel2.target</filename>, |
74 | <filename>runlevel3.target</filename>, | |
75 | <filename>runlevel4.target</filename>, | |
76 | <filename>runlevel5.target</filename>, | |
9f2c5942 LP |
77 | <filename>shutdown.target</filename>, |
78 | <filename>sigpwr.target</filename>, | |
79 | <filename>sockets.target</filename>, | |
80 | <filename>swap.target</filename>, | |
f92a18f5 | 81 | <filename>sysinit.target</filename>, |
62adf224 | 82 | <filename>syslog.target</filename>, |
9f2c5942 LP |
83 | <filename>systemd-initctl.service</filename>, |
84 | <filename>systemd-initctl.socket</filename>, | |
346bce1f LP |
85 | <filename>systemd-stdout-syslog-bridge.service</filename>, |
86 | <filename>systemd-stdout-syslog-bridge.socket</filename>, | |
db47cc2a | 87 | <filename>time-sync.target</filename>, |
3b6fdb5b | 88 | <filename>umount.target</filename></para> |
9f235308 LP |
89 | </refsynopsisdiv> |
90 | ||
91 | <refsect1> | |
92 | <title>Description</title> | |
93 | ||
94 | <para>A few units are treated specially by | |
95 | systemd. They have special internal semantics and | |
96 | cannot be renamed.</para> | |
97 | </refsect1> | |
98 | ||
99 | <refsect1> | |
100 | <title>Special System Units</title> | |
101 | ||
102 | <variablelist> | |
bd3d19a4 LP |
103 | <varlistentry> |
104 | <term><filename>basic.target</filename></term> | |
105 | <listitem> | |
106 | <para>A special target unit | |
107 | covering early boot-up.</para> | |
108 | <para>systemd automatically | |
109 | adds dependencies of the types | |
110 | Requires and After for this | |
111 | target unit to all SysV | |
112 | service units configured for | |
113 | runlevel 1 to 5.</para> | |
af62c704 KS |
114 | <para>Usually this should pull-in |
115 | all sockets, mount points, | |
f92a18f5 LP |
116 | swap devices and other basic |
117 | initialization necessary for | |
118 | the general purpose | |
af62c704 | 119 | daemons. Most normal daemons |
f92a18f5 LP |
120 | should have dependencies of |
121 | type After and Requires on | |
122 | this unit.</para> | |
bd3d19a4 LP |
123 | </listitem> |
124 | </varlistentry> | |
125 | <varlistentry> | |
126 | <term><filename>ctrl-alt-del.target</filename></term> | |
127 | <listitem> | |
128 | <para>systemd starts this | |
129 | target whenever | |
130 | Control+Alt+Del is pressed on | |
131 | the console. Usually this | |
132 | should be aliased (symlinked) | |
133 | to | |
134 | <filename>reboot.target</filename>.</para> | |
135 | </listitem> | |
136 | </varlistentry> | |
eeb7229c | 137 | <varlistentry> |
83bda358 | 138 | <term><filename>dbus.service</filename></term> |
eeb7229c LP |
139 | <listitem> |
140 | <para>A special unit for the | |
141 | D-Bus system bus. As soon as | |
142 | this service is fully started | |
143 | up systemd will connect to it | |
144 | and register its | |
145 | service.</para> | |
146 | </listitem> | |
147 | </varlistentry> | |
bd3d19a4 LP |
148 | <varlistentry> |
149 | <term><filename>default.target</filename></term> | |
150 | <listitem> | |
151 | <para>The default unit systemd | |
152 | starts at bootup. Usually this | |
153 | should be aliased (symlinked) | |
154 | to | |
155 | <filename>multi-user.target</filename> | |
156 | or | |
157 | <filename>graphical.target</filename>.</para> | |
158 | <para>The default unit systemd | |
159 | starts at bootup can be | |
8f28cbcd | 160 | overridden with the |
2d87855a | 161 | <varname>systemd.unit=</varname> |
bd3d19a4 LP |
162 | kernel command line option.</para> |
163 | </listitem> | |
164 | </varlistentry> | |
1e287fe3 LP |
165 | <varlistentry> |
166 | <term><filename>display-manager.service</filename></term> | |
167 | <listitem> | |
168 | <para>The display manager | |
169 | service. Usually this should | |
170 | be aliased (symlinked) to | |
af62c704 | 171 | <filename>xdm.service</filename> |
1e287fe3 LP |
172 | or a similar display manager |
173 | service.</para> | |
174 | <para>systemd automatically | |
175 | adds dependencies of type | |
176 | After for this target unit to | |
177 | all SysV init script service | |
af62c704 | 178 | units with a LSB header |
1e287fe3 LP |
179 | referring to the |
180 | <literal>$x-display-manager</literal> | |
181 | facility, for compatibility | |
182 | with Debian.</para> | |
183 | </listitem> | |
184 | </varlistentry> | |
9f235308 | 185 | <varlistentry> |
f057408c | 186 | <term><filename>emergency.target</filename></term> |
9f235308 | 187 | <listitem> |
f057408c | 188 | <para>A special target unit |
9f235308 LP |
189 | that starts an emergency |
190 | shell on the main | |
191 | console. This unit is supposed | |
192 | to be used with the kernel | |
193 | command line option | |
2d87855a | 194 | <varname>systemd.unit=</varname> |
9f235308 LP |
195 | and has otherwise little use. |
196 | </para> | |
197 | </listitem> | |
198 | </varlistentry> | |
bd3d19a4 LP |
199 | <varlistentry> |
200 | <term><filename>graphical.target</filename></term> | |
201 | <listitem> | |
202 | <para>A special target unit | |
203 | for setting up a graphical | |
204 | login screen. This pulls in | |
205 | <filename>multi-user.target</filename>.</para> | |
206 | ||
207 | <para>Units that are needed | |
208 | for graphical login shall add | |
209 | Wants dependencies for their | |
210 | unit to this unit (or | |
211 | <filename>multi-user.target</filename>) | |
212 | during installation.</para> | |
213 | </listitem> | |
214 | </varlistentry> | |
215 | <varlistentry> | |
216 | <term><filename>halt.target</filename></term> | |
217 | <listitem> | |
218 | <para>A special target unit | |
219 | for shutting down and halting the system.</para> | |
220 | ||
221 | <para>Applications wanting to | |
222 | halt the system should start | |
223 | this unit.</para> | |
224 | </listitem> | |
225 | </varlistentry> | |
226 | <varlistentry> | |
227 | <term><filename>kbrequest.target</filename></term> | |
228 | <listitem> | |
229 | <para>systemd starts this | |
230 | target whenever Alt+ArrowUp is | |
231 | pressed on the console. This | |
232 | is a good candidate to be | |
233 | aliased (symlinked) to | |
234 | <filename>rescue.target</filename>.</para> | |
235 | </listitem> | |
236 | </varlistentry> | |
9f235308 LP |
237 | <varlistentry> |
238 | <term><filename>local-fs.target</filename></term> | |
239 | <listitem> | |
240 | <para>systemd automatically | |
241 | adds dependencies of type | |
242 | After to all mount units that | |
bd3d19a4 LP |
243 | refer to local mount points |
244 | for this target unit. In | |
245 | addition, systemd adds | |
246 | dependencies of type Wants to | |
247 | this target unit for those | |
248 | mounts listed in | |
9f235308 LP |
249 | <filename>/etc/fstab</filename> |
250 | that have the | |
0d624a78 LP |
251 | <option>auto</option> and |
252 | <option>comment=systemd.mount</option> | |
9f235308 LP |
253 | mount options set.</para> |
254 | ||
255 | <para>systemd automatically | |
256 | adds dependencies of type | |
bd3d19a4 LP |
257 | After for this target unit to |
258 | all SysV init script service | |
259 | units with an LSB header | |
260 | referring to the | |
9f235308 LP |
261 | <literal>$local_fs</literal> |
262 | facility.</para> | |
263 | </listitem> | |
264 | </varlistentry> | |
21e557ed LP |
265 | <varlistentry> |
266 | <term><filename>local-fs-pre.target</filename></term> | |
267 | <listitem> | |
268 | <para>This target unit is | |
269 | automatically ordered before | |
270 | all local mount points marked | |
271 | with <option>auto</option> | |
272 | (see above). It can be used to | |
273 | execute certain units before | |
274 | all local mounts.</para> | |
275 | </listitem> | |
276 | </varlistentry> | |
683f468c LP |
277 | <varlistentry> |
278 | <term><filename>mail-transfer-agent.target</filename></term> | |
279 | <listitem> | |
280 | <para>The mail transfer agent | |
281 | (MTA) service. Usually this | |
af62c704 | 282 | should pull-in all units |
683f468c LP |
283 | necessary for |
284 | sending/receiving mails on the | |
285 | local host.</para> | |
286 | ||
287 | <para>systemd automatically | |
288 | adds dependencies of type | |
289 | After for this target unit to | |
290 | all SysV init script service | |
291 | units with an LSB header | |
292 | referring to the | |
8f28cbcd | 293 | <literal>$mail-transfer-agent</literal> |
683f468c LP |
294 | or |
295 | <literal>$mail-transport-agent</literal> | |
296 | facilities, for compatibility | |
297 | with Debian.</para> | |
298 | </listitem> | |
299 | </varlistentry> | |
bd3d19a4 LP |
300 | <varlistentry> |
301 | <term><filename>multi-user.target</filename></term> | |
302 | <listitem> | |
303 | <para>A special target unit | |
304 | for setting up a multi-user | |
305 | system (non-graphical). This | |
306 | is pulled in by | |
307 | <filename>graphical.target</filename>.</para> | |
308 | ||
309 | <para>Units that are needed | |
310 | for a multi-user system shall | |
311 | add Wants dependencies to | |
312 | this unit for their unit during | |
313 | installation.</para> | |
314 | </listitem> | |
315 | </varlistentry> | |
9f235308 LP |
316 | <varlistentry> |
317 | <term><filename>network.target</filename></term> | |
318 | <listitem> | |
319 | <para>systemd automatically | |
320 | adds dependencies of type | |
bd3d19a4 LP |
321 | After for this target unit to |
322 | all SysV init script service | |
323 | units with an LSB header | |
324 | referring to the | |
9f235308 LP |
325 | <literal>$network</literal> |
326 | facility.</para> | |
327 | </listitem> | |
328 | </varlistentry> | |
329 | <varlistentry> | |
330 | <term><filename>nss-lookup.target</filename></term> | |
331 | <listitem> | |
332 | <para>systemd automatically | |
333 | adds dependencies of type | |
bd3d19a4 LP |
334 | After for this target unit to |
335 | all SysV init script service | |
336 | units with an LSB header | |
337 | referring to the | |
9f235308 LP |
338 | <literal>$named</literal> |
339 | facility.</para> | |
340 | </listitem> | |
341 | </varlistentry> | |
bd3d19a4 LP |
342 | <varlistentry> |
343 | <term><filename>poweroff.target</filename></term> | |
344 | <listitem> | |
345 | <para>A special target unit | |
346 | for shutting down and powering off the system.</para> | |
347 | ||
348 | <para>Applications wanting to | |
349 | power off the system should start | |
350 | this unit.</para> | |
351 | ||
352 | <para><filename>runlevel0.target</filename> | |
353 | is an alias for this target | |
354 | unit, for compatibility with SysV.</para> | |
355 | </listitem> | |
356 | </varlistentry> | |
357 | <varlistentry> | |
358 | <term><filename>reboot.target</filename></term> | |
359 | <listitem> | |
360 | <para>A special target unit | |
361 | for shutting down and rebooting the system.</para> | |
362 | ||
363 | <para>Applications wanting to | |
364 | reboot the system should start | |
365 | this unit.</para> | |
366 | ||
367 | <para><filename>runlevel6.target</filename> | |
368 | is an alias for this target | |
369 | unit, for compatibility with SysV.</para> | |
370 | </listitem> | |
371 | </varlistentry> | |
9f235308 LP |
372 | <varlistentry> |
373 | <term><filename>remote-fs.target</filename></term> | |
374 | <listitem> | |
bd3d19a4 LP |
375 | <para>Similar to |
376 | <filename>local-fs.target</filename>, | |
377 | but for remote mount | |
378 | points.</para> | |
379 | ||
9f235308 LP |
380 | <para>systemd automatically |
381 | adds dependencies of type | |
bd3d19a4 LP |
382 | After for this target unit to |
383 | all SysV init script service | |
384 | units with an LSB header | |
385 | referring to the | |
1e89ced1 | 386 | <literal>$remote_fs</literal> |
9f235308 LP |
387 | facility.</para> |
388 | </listitem> | |
389 | </varlistentry> | |
21e557ed LP |
390 | <varlistentry> |
391 | <term><filename>remote-fs-pre.target</filename></term> | |
392 | <listitem> | |
393 | <para>This target unit is | |
394 | automatically ordered before | |
395 | all remote mount points marked | |
396 | with <option>auto</option> | |
397 | (see above). It can be used to | |
398 | execute certain units before | |
399 | all remote mounts.</para> | |
400 | </listitem> | |
401 | </varlistentry> | |
bd3d19a4 LP |
402 | <varlistentry> |
403 | <term><filename>rescue.target</filename></term> | |
404 | <listitem> | |
405 | <para>A special target unit | |
406 | for setting up the base system | |
407 | and a rescue shell.</para> | |
408 | ||
409 | <para><filename>runlevel1.target</filename> | |
410 | is an alias for this target | |
411 | unit, for compatibility with SysV.</para> | |
412 | </listitem> | |
413 | </varlistentry> | |
9f235308 LP |
414 | <varlistentry> |
415 | <term><filename>rpcbind.target</filename></term> | |
416 | <listitem> | |
417 | <para>systemd automatically | |
418 | adds dependencies of type | |
bd3d19a4 LP |
419 | After for this target unit to |
420 | all SysV init script service | |
421 | units with an LSB header | |
422 | referring to the | |
9f235308 LP |
423 | <literal>$rpcbind</literal> |
424 | facility.</para> | |
425 | </listitem> | |
426 | </varlistentry> | |
bd3d19a4 LP |
427 | <varlistentry> |
428 | <term><filename>runlevel2.target</filename></term> | |
429 | <listitem> | |
430 | <para>This is a target that is | |
8f28cbcd | 431 | called whenever the SysV |
bd3d19a4 LP |
432 | compatibility code asks for |
433 | runlevel 2. It is a good idea | |
434 | to make this an alias for | |
435 | (i.e. symlink to) | |
436 | <filename>multi-user.target</filename>.</para> | |
437 | </listitem> | |
438 | </varlistentry> | |
439 | <varlistentry> | |
440 | <term><filename>runlevel3.target</filename></term> | |
441 | <listitem> | |
442 | <para>This is a target that is | |
8f28cbcd | 443 | called whenever the SysV |
bd3d19a4 LP |
444 | compatibility code asks for |
445 | runlevel 3. It is a good idea | |
446 | to make this an alias for | |
447 | (i.e. symlink to) | |
448 | <filename>multi-user.target</filename> | |
449 | or | |
450 | <filename>graphical.target</filename>.</para> | |
451 | </listitem> | |
452 | </varlistentry> | |
453 | <varlistentry> | |
454 | <term><filename>runlevel4.target</filename></term> | |
455 | <listitem> | |
456 | <para>This is a target that is | |
8f28cbcd | 457 | called whenever the SysV |
bd3d19a4 LP |
458 | compatibility code asks for |
459 | runlevel 4. It is a good idea | |
460 | to make this an alias for | |
461 | (i.e. symlink to) | |
462 | <filename>multi-user.target</filename> | |
463 | or | |
464 | <filename>graphical.target</filename>.</para> | |
465 | </listitem> | |
466 | </varlistentry> | |
467 | <varlistentry> | |
468 | <term><filename>runlevel5.target</filename></term> | |
469 | <listitem> | |
470 | <para>This is a target that is | |
8f28cbcd | 471 | called whenever the SysV |
bd3d19a4 LP |
472 | compatibility code asks for |
473 | runlevel 5. It is a good idea | |
474 | to make this an alias for | |
475 | (i.e. symlink to) | |
476 | <filename>multi-user.target</filename> | |
477 | or | |
478 | <filename>graphical.target</filename>.</para> | |
479 | </listitem> | |
480 | </varlistentry> | |
9f235308 LP |
481 | <varlistentry> |
482 | <term><filename>shutdown.target</filename></term> | |
483 | <listitem> | |
484 | <para>A special target unit | |
485 | that terminates the services | |
486 | on system shutdown.</para> | |
487 | ||
488 | <para>Services that shall be | |
489 | terminated on system shutdown | |
bd3d19a4 LP |
490 | shall add Conflicts |
491 | dependencies to this unit for | |
3b6fdb5b LP |
492 | their service unit, which is |
493 | implicitly done when | |
494 | <varname>DefaultDependencies=yes</varname> | |
495 | is set (the default).</para> | |
9f235308 LP |
496 | |
497 | <para>systemd automatically | |
498 | adds dependencies of type | |
499 | Conflicts to this target unit | |
bd3d19a4 LP |
500 | for all SysV init script |
501 | service units that shall be | |
502 | terminated in SysV runlevels 0 | |
503 | or 6.</para> | |
9f235308 LP |
504 | </listitem> |
505 | </varlistentry> | |
506 | <varlistentry> | |
507 | <term><filename>sigpwr.target</filename></term> | |
508 | <listitem> | |
509 | <para>A special target that is | |
510 | started when systemd receives | |
511 | the SIGPWR process signal, | |
512 | which is normally sent by the | |
bd3d19a4 | 513 | kernel or UPS daemons when |
9f235308 LP |
514 | power fails.</para> |
515 | </listitem> | |
516 | </varlistentry> | |
517 | <varlistentry> | |
518 | <term><filename>sockets.target</filename></term> | |
519 | <listitem> | |
520 | <para>A special target unit | |
521 | that sets up all service | |
522 | sockets.</para> | |
523 | ||
524 | <para>Services that can be | |
525 | socket-activated shall add | |
bd3d19a4 LP |
526 | Wants dependencies to this |
527 | unit for their socket unit | |
9f235308 LP |
528 | during installation.</para> |
529 | </listitem> | |
530 | </varlistentry> | |
531 | <varlistentry> | |
532 | <term><filename>swap.target</filename></term> | |
533 | <listitem> | |
534 | <para>Similar to | |
535 | <filename>local-fs.target</filename>, but for swap | |
536 | partitions and swap | |
537 | files.</para> | |
538 | </listitem> | |
539 | </varlistentry> | |
f92a18f5 LP |
540 | <varlistentry> |
541 | <term><filename>sysinit.target</filename></term> | |
542 | <listitem> | |
543 | <para>A special target unit | |
544 | covering early boot-up scripts.</para> | |
545 | <para>systemd automatically | |
546 | adds dependencies of the types | |
547 | Wants and After for all | |
548 | SysV service units configured | |
549 | for runlevels that are not 0 | |
550 | to 6 to this target unit. | |
551 | This covers the special | |
552 | boot-up runlevels some | |
553 | distributions have, such as S | |
554 | or b.</para> | |
555 | </listitem> | |
556 | </varlistentry> | |
62adf224 LP |
557 | <varlistentry> |
558 | <term><filename>syslog.target</filename></term> | |
559 | <listitem> | |
560 | <para>systemd automatically | |
561 | adds dependencies of type | |
562 | After for this target unit to | |
563 | all SysV init script service | |
564 | units with an LSB header | |
565 | referring to the | |
566 | <literal>$syslog</literal> | |
567 | facility.</para> | |
eeb7229c LP |
568 | </listitem> |
569 | </varlistentry> | |
9f235308 LP |
570 | <varlistentry> |
571 | <term><filename>systemd-initctl.service</filename></term> | |
572 | <listitem> | |
573 | <para>This provides | |
574 | compatibility with the SysV | |
575 | /dev/initctl file system FIFO | |
576 | for communication with the | |
577 | init system.</para> | |
578 | <para>This is a | |
579 | socket-activated service, see | |
580 | <filename>system-initctl.socket</filename>.</para> | |
581 | </listitem> | |
582 | </varlistentry> | |
583 | <varlistentry> | |
584 | <term><filename>systemd-initctl.socket</filename></term> | |
585 | <listitem> | |
586 | <para>Socket activation unit | |
587 | for | |
588 | <filename>system-initctl.service</filename>.</para> | |
589 | </listitem> | |
590 | </varlistentry> | |
591 | <varlistentry> | |
346bce1f | 592 | <term><filename>systemd-stdout-syslog-bridge.service</filename></term> |
9f235308 | 593 | <listitem> |
bd3d19a4 | 594 | <para>This is internally used |
9f235308 | 595 | by systemd to provide syslog |
bd3d19a4 LP |
596 | logging to the processes it |
597 | maintains.</para> | |
9f235308 LP |
598 | <para>This is a |
599 | socket-activated service, see | |
346bce1f | 600 | <filename>system-stdout-syslog-bridge.socket</filename>.</para> |
9f235308 LP |
601 | </listitem> |
602 | </varlistentry> | |
603 | <varlistentry> | |
346bce1f | 604 | <term><filename>systemd-stdout-syslog-bridge.socket</filename></term> |
9f235308 LP |
605 | <listitem> |
606 | <para>Socket activation unit | |
607 | for | |
346bce1f | 608 | <filename>system-stdout-syslog-bridge.service</filename>. systemd |
bd3d19a4 LP |
609 | will automatically add |
610 | dependencies of types Requires | |
611 | and After to all units that | |
612 | have been configured for | |
613 | stdout or stderr to be | |
614 | connected to syslog or the | |
615 | kernel log buffer.</para> | |
9f235308 | 616 | </listitem> |
5dc50792 LP |
617 | </varlistentry> |
618 | <varlistentry> | |
619 | <term><filename>systemd-shutdownd.service</filename></term> | |
620 | <listitem> | |
621 | <para>This is internally used | |
622 | by | |
623 | <citerefentry><refentrytitle>shutdown</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
624 | to implement delayed shutdowns.</para> | |
625 | <para>This is a | |
626 | socket-activated service, see | |
627 | <filename>system-shutdownd.socket</filename>.</para> | |
628 | </listitem> | |
629 | </varlistentry> | |
630 | <varlistentry> | |
631 | <term><filename>systemd-shutdownd.socket</filename></term> | |
632 | <listitem> | |
633 | <para>Socket activation unit | |
634 | for | |
635 | <filename>system-shutdownd.service</filename>.</para> | |
636 | </listitem> | |
9f235308 | 637 | </varlistentry> |
db47cc2a JT |
638 | <varlistentry> |
639 | <term><filename>time-sync.target</filename></term> | |
640 | <listitem> | |
641 | <para>systemd automatically | |
642 | adds dependencies of type | |
643 | After for this target unit to | |
644 | all SysV init script service | |
645 | units with an LSB header | |
646 | referring to the | |
647 | <literal>$time</literal> | |
648 | facility.</para> | |
649 | </listitem> | |
650 | </varlistentry> | |
3b6fdb5b LP |
651 | <varlistentry> |
652 | <term><filename>umount.target</filename></term> | |
653 | <listitem> | |
654 | <para>A special target unit | |
655 | that umounts all mount and | |
656 | automount points on system | |
657 | shutdown.</para> | |
658 | ||
659 | <para>Mounts that shall be | |
660 | unmounted on system shutdown | |
661 | shall add Conflicts | |
662 | dependencies to this unit for | |
663 | their mount unit, which is | |
664 | implicitly done when | |
665 | <varname>DefaultDependencies=yes</varname> | |
666 | is set (the default).</para> | |
667 | </listitem> | |
668 | </varlistentry> | |
9f235308 LP |
669 | </variablelist> |
670 | </refsect1> | |
671 | ||
672 | <refsect1> | |
af2d49f7 | 673 | <title>Special User Units</title> |
9f235308 | 674 | |
af2d49f7 | 675 | <para>When systemd runs as a user instance, the |
9f235308 LP |
676 | following special units are available, which have |
677 | similar definitions as their system counterparts: | |
bd3d19a4 | 678 | <filename>default.target</filename>, |
9f235308 LP |
679 | <filename>local-fs.target</filename>, |
680 | <filename>remote-fs.target</filename>, | |
681 | <filename>shutdown.target</filename>, | |
682 | <filename>sockets.target</filename>, | |
683 | <filename>swap.target</filename>.</para> | |
a1b256b0 LP |
684 | |
685 | <para>In addition the following special unit is | |
686 | understood only when systemd runs as service instance:</para> | |
687 | ||
688 | <variablelist> | |
689 | <varlistentry> | |
690 | <term><filename>exit.service</filename></term> | |
691 | <listitem> | |
692 | <para>A special service unit | |
693 | for shutting down the | |
af2d49f7 | 694 | user service manager.</para> |
a1b256b0 LP |
695 | |
696 | <para>Applications wanting to | |
af2d49f7 LP |
697 | terminate the user service |
698 | manager should start this | |
699 | unit. If systemd receives | |
700 | SIGTERM or SIGINT when running | |
701 | as user service daemon it will | |
702 | start this unit.</para> | |
a1b256b0 LP |
703 | |
704 | <para>Normally, this pulls in | |
705 | <filename>shutdown.target</filename> | |
706 | which in turn should be | |
707 | conflicted by all units that | |
708 | want to be shut down on | |
af2d49f7 | 709 | user service manager exit.</para> |
a1b256b0 LP |
710 | </listitem> |
711 | </varlistentry> | |
712 | </variablelist> | |
9f235308 LP |
713 | </refsect1> |
714 | ||
715 | <refsect1> | |
716 | <title>See Also</title> | |
717 | <para> | |
5dc50792 LP |
718 | <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>, |
719 | <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
720 | <citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
9f235308 LP |
721 | <citerefentry><refentrytitle>systemd.target</refentrytitle><manvolnum>5</manvolnum></citerefentry> |
722 | </para> | |
723 | </refsect1> | |
724 | ||
725 | </refentry> |