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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>, |
62adf224 | 54 | <filename>dbus.target</filename>, |
9f2c5942 | 55 | <filename>default.target</filename>, |
1e287fe3 | 56 | <filename>display-manager.service</filename>, |
f057408c | 57 | <filename>emergency.target</filename>, |
a1b256b0 | 58 | <filename>exit.service</filename>, |
9f2c5942 LP |
59 | <filename>graphical.target</filename>, |
60 | <filename>halt.target</filename>, | |
61 | <filename>kbrequest.target</filename>, | |
62 | <filename>local-fs.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>, | |
70 | <filename>rescue.target</filename>, | |
71 | <filename>rpcbind.target</filename>, | |
72 | <filename>rtc-set.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>, |
eeb7229c | 82 | <filename>@SPECIAL_SYSLOG_SERVICE@</filename>, |
62adf224 | 83 | <filename>syslog.target</filename>, |
9f2c5942 LP |
84 | <filename>systemd-initctl.service</filename>, |
85 | <filename>systemd-initctl.socket</filename>, | |
86 | <filename>systemd-logger.service</filename>, | |
3b6fdb5b LP |
87 | <filename>systemd-logger.socket</filename>, |
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> | |
62adf224 LP |
146 | |
147 | <para>Units should generally | |
148 | avoid depending on this unit | |
149 | directly and instead refer to | |
150 | the | |
151 | <filename>dbus.target</filename> | |
152 | unit instead, which pulls this | |
153 | one in directly or indirectly | |
154 | via socket-based activation.</para> | |
155 | </listitem> | |
156 | </varlistentry> | |
157 | <varlistentry> | |
158 | <term><filename>dbus.target</filename></term> | |
159 | <listitem> | |
160 | <para>Administrators should | |
161 | ensure that this target pulls | |
162 | in a service unit with the | |
163 | name or alias of | |
83bda358 | 164 | <filename>dbus.service</filename> |
62adf224 LP |
165 | (or a socket unit that |
166 | activates this | |
167 | service).</para> | |
eeb7229c LP |
168 | </listitem> |
169 | </varlistentry> | |
bd3d19a4 LP |
170 | <varlistentry> |
171 | <term><filename>default.target</filename></term> | |
172 | <listitem> | |
173 | <para>The default unit systemd | |
174 | starts at bootup. Usually this | |
175 | should be aliased (symlinked) | |
176 | to | |
177 | <filename>multi-user.target</filename> | |
178 | or | |
179 | <filename>graphical.target</filename>.</para> | |
180 | <para>The default unit systemd | |
181 | starts at bootup can be | |
182 | overriden with the | |
183 | <varname>systemd.default=</varname> | |
184 | kernel command line option.</para> | |
185 | </listitem> | |
186 | </varlistentry> | |
1e287fe3 LP |
187 | <varlistentry> |
188 | <term><filename>display-manager.service</filename></term> | |
189 | <listitem> | |
190 | <para>The display manager | |
191 | service. Usually this should | |
192 | be aliased (symlinked) to | |
af62c704 | 193 | <filename>xdm.service</filename> |
1e287fe3 LP |
194 | or a similar display manager |
195 | service.</para> | |
196 | <para>systemd automatically | |
197 | adds dependencies of type | |
198 | After for this target unit to | |
199 | all SysV init script service | |
af62c704 | 200 | units with a LSB header |
1e287fe3 LP |
201 | referring to the |
202 | <literal>$x-display-manager</literal> | |
203 | facility, for compatibility | |
204 | with Debian.</para> | |
205 | </listitem> | |
206 | </varlistentry> | |
9f235308 | 207 | <varlistentry> |
f057408c | 208 | <term><filename>emergency.target</filename></term> |
9f235308 | 209 | <listitem> |
f057408c | 210 | <para>A special target unit |
9f235308 LP |
211 | that starts an emergency |
212 | shell on the main | |
213 | console. This unit is supposed | |
214 | to be used with the kernel | |
215 | command line option | |
216 | <varname>systemd.default=</varname> | |
217 | and has otherwise little use. | |
218 | </para> | |
219 | </listitem> | |
220 | </varlistentry> | |
bd3d19a4 LP |
221 | <varlistentry> |
222 | <term><filename>graphical.target</filename></term> | |
223 | <listitem> | |
224 | <para>A special target unit | |
225 | for setting up a graphical | |
226 | login screen. This pulls in | |
227 | <filename>multi-user.target</filename>.</para> | |
228 | ||
229 | <para>Units that are needed | |
230 | for graphical login shall add | |
231 | Wants dependencies for their | |
232 | unit to this unit (or | |
233 | <filename>multi-user.target</filename>) | |
234 | during installation.</para> | |
235 | </listitem> | |
236 | </varlistentry> | |
237 | <varlistentry> | |
238 | <term><filename>halt.target</filename></term> | |
239 | <listitem> | |
240 | <para>A special target unit | |
241 | for shutting down and halting the system.</para> | |
242 | ||
243 | <para>Applications wanting to | |
244 | halt the system should start | |
245 | this unit.</para> | |
246 | </listitem> | |
247 | </varlistentry> | |
248 | <varlistentry> | |
249 | <term><filename>kbrequest.target</filename></term> | |
250 | <listitem> | |
251 | <para>systemd starts this | |
252 | target whenever Alt+ArrowUp is | |
253 | pressed on the console. This | |
254 | is a good candidate to be | |
255 | aliased (symlinked) to | |
256 | <filename>rescue.target</filename>.</para> | |
257 | </listitem> | |
258 | </varlistentry> | |
9f235308 LP |
259 | <varlistentry> |
260 | <term><filename>local-fs.target</filename></term> | |
261 | <listitem> | |
262 | <para>systemd automatically | |
263 | adds dependencies of type | |
264 | After to all mount units that | |
bd3d19a4 LP |
265 | refer to local mount points |
266 | for this target unit. In | |
267 | addition, systemd adds | |
268 | dependencies of type Wants to | |
269 | this target unit for those | |
270 | mounts listed in | |
9f235308 LP |
271 | <filename>/etc/fstab</filename> |
272 | that have the | |
0d624a78 LP |
273 | <option>auto</option> and |
274 | <option>comment=systemd.mount</option> | |
9f235308 LP |
275 | mount options set.</para> |
276 | ||
277 | <para>systemd automatically | |
278 | adds dependencies of type | |
bd3d19a4 LP |
279 | After for this target unit to |
280 | all SysV init script service | |
281 | units with an LSB header | |
282 | referring to the | |
9f235308 LP |
283 | <literal>$local_fs</literal> |
284 | facility.</para> | |
285 | </listitem> | |
286 | </varlistentry> | |
683f468c LP |
287 | <varlistentry> |
288 | <term><filename>mail-transfer-agent.target</filename></term> | |
289 | <listitem> | |
290 | <para>The mail transfer agent | |
291 | (MTA) service. Usually this | |
af62c704 | 292 | should pull-in all units |
683f468c LP |
293 | necessary for |
294 | sending/receiving mails on the | |
295 | local host.</para> | |
296 | ||
297 | <para>systemd automatically | |
298 | adds dependencies of type | |
299 | After for this target unit to | |
300 | all SysV init script service | |
301 | units with an LSB header | |
302 | referring to the | |
303 | <literal>$mail-transfer-argent</literal> | |
304 | or | |
305 | <literal>$mail-transport-agent</literal> | |
306 | facilities, for compatibility | |
307 | with Debian.</para> | |
308 | </listitem> | |
309 | </varlistentry> | |
bd3d19a4 LP |
310 | <varlistentry> |
311 | <term><filename>multi-user.target</filename></term> | |
312 | <listitem> | |
313 | <para>A special target unit | |
314 | for setting up a multi-user | |
315 | system (non-graphical). This | |
316 | is pulled in by | |
317 | <filename>graphical.target</filename>.</para> | |
318 | ||
319 | <para>Units that are needed | |
320 | for a multi-user system shall | |
321 | add Wants dependencies to | |
322 | this unit for their unit during | |
323 | installation.</para> | |
324 | </listitem> | |
325 | </varlistentry> | |
9f235308 LP |
326 | <varlistentry> |
327 | <term><filename>network.target</filename></term> | |
328 | <listitem> | |
329 | <para>systemd automatically | |
330 | adds dependencies of type | |
bd3d19a4 LP |
331 | After for this target unit to |
332 | all SysV init script service | |
333 | units with an LSB header | |
334 | referring to the | |
9f235308 LP |
335 | <literal>$network</literal> |
336 | facility.</para> | |
337 | </listitem> | |
338 | </varlistentry> | |
339 | <varlistentry> | |
340 | <term><filename>nss-lookup.target</filename></term> | |
341 | <listitem> | |
342 | <para>systemd automatically | |
343 | adds dependencies of type | |
bd3d19a4 LP |
344 | After for this target unit to |
345 | all SysV init script service | |
346 | units with an LSB header | |
347 | referring to the | |
9f235308 LP |
348 | <literal>$named</literal> |
349 | facility.</para> | |
350 | </listitem> | |
351 | </varlistentry> | |
bd3d19a4 LP |
352 | <varlistentry> |
353 | <term><filename>poweroff.target</filename></term> | |
354 | <listitem> | |
355 | <para>A special target unit | |
356 | for shutting down and powering off the system.</para> | |
357 | ||
358 | <para>Applications wanting to | |
359 | power off the system should start | |
360 | this unit.</para> | |
361 | ||
362 | <para><filename>runlevel0.target</filename> | |
363 | is an alias for this target | |
364 | unit, for compatibility with SysV.</para> | |
365 | </listitem> | |
366 | </varlistentry> | |
367 | <varlistentry> | |
368 | <term><filename>reboot.target</filename></term> | |
369 | <listitem> | |
370 | <para>A special target unit | |
371 | for shutting down and rebooting the system.</para> | |
372 | ||
373 | <para>Applications wanting to | |
374 | reboot the system should start | |
375 | this unit.</para> | |
376 | ||
377 | <para><filename>runlevel6.target</filename> | |
378 | is an alias for this target | |
379 | unit, for compatibility with SysV.</para> | |
380 | </listitem> | |
381 | </varlistentry> | |
9f235308 LP |
382 | <varlistentry> |
383 | <term><filename>remote-fs.target</filename></term> | |
384 | <listitem> | |
bd3d19a4 LP |
385 | <para>Similar to |
386 | <filename>local-fs.target</filename>, | |
387 | but for remote mount | |
388 | points.</para> | |
389 | ||
9f235308 LP |
390 | <para>systemd automatically |
391 | adds dependencies of type | |
bd3d19a4 LP |
392 | After for this target unit to |
393 | all SysV init script service | |
394 | units with an LSB header | |
395 | referring to the | |
1e89ced1 | 396 | <literal>$remote_fs</literal> |
9f235308 LP |
397 | facility.</para> |
398 | </listitem> | |
399 | </varlistentry> | |
bd3d19a4 LP |
400 | <varlistentry> |
401 | <term><filename>rescue.target</filename></term> | |
402 | <listitem> | |
403 | <para>A special target unit | |
404 | for setting up the base system | |
405 | and a rescue shell.</para> | |
406 | ||
407 | <para><filename>runlevel1.target</filename> | |
408 | is an alias for this target | |
409 | unit, for compatibility with SysV.</para> | |
410 | </listitem> | |
411 | </varlistentry> | |
9f235308 LP |
412 | <varlistentry> |
413 | <term><filename>rpcbind.target</filename></term> | |
414 | <listitem> | |
415 | <para>systemd automatically | |
416 | adds dependencies of type | |
bd3d19a4 LP |
417 | After for this target unit to |
418 | all SysV init script service | |
419 | units with an LSB header | |
420 | referring to the | |
9f235308 LP |
421 | <literal>$rpcbind</literal> |
422 | facility.</para> | |
423 | </listitem> | |
424 | </varlistentry> | |
425 | <varlistentry> | |
426 | <term><filename>rtc-set.target</filename></term> | |
427 | <listitem> | |
428 | <para>systemd automatically | |
429 | adds dependencies of type | |
bd3d19a4 LP |
430 | After for this target unit to |
431 | all SysV init script service | |
432 | units with an LSB header | |
433 | referring to the | |
9f235308 LP |
434 | <literal>$time</literal> |
435 | facility.</para> | |
436 | </listitem> | |
437 | </varlistentry> | |
bd3d19a4 LP |
438 | <varlistentry> |
439 | <term><filename>runlevel2.target</filename></term> | |
440 | <listitem> | |
441 | <para>This is a target that is | |
442 | called whever the SysV | |
443 | compatibility code asks for | |
444 | runlevel 2. It is a good idea | |
445 | to make this an alias for | |
446 | (i.e. symlink to) | |
447 | <filename>multi-user.target</filename>.</para> | |
448 | </listitem> | |
449 | </varlistentry> | |
450 | <varlistentry> | |
451 | <term><filename>runlevel3.target</filename></term> | |
452 | <listitem> | |
453 | <para>This is a target that is | |
454 | called whever the SysV | |
455 | compatibility code asks for | |
456 | runlevel 3. It is a good idea | |
457 | to make this an alias for | |
458 | (i.e. symlink to) | |
459 | <filename>multi-user.target</filename> | |
460 | or | |
461 | <filename>graphical.target</filename>.</para> | |
462 | </listitem> | |
463 | </varlistentry> | |
464 | <varlistentry> | |
465 | <term><filename>runlevel4.target</filename></term> | |
466 | <listitem> | |
467 | <para>This is a target that is | |
468 | called whever the SysV | |
469 | compatibility code asks for | |
470 | runlevel 4. It is a good idea | |
471 | to make this an alias for | |
472 | (i.e. symlink to) | |
473 | <filename>multi-user.target</filename> | |
474 | or | |
475 | <filename>graphical.target</filename>.</para> | |
476 | </listitem> | |
477 | </varlistentry> | |
478 | <varlistentry> | |
479 | <term><filename>runlevel5.target</filename></term> | |
480 | <listitem> | |
481 | <para>This is a target that is | |
482 | called whever the SysV | |
483 | compatibility code asks for | |
484 | runlevel 5. It is a good idea | |
485 | to make this an alias for | |
486 | (i.e. symlink to) | |
487 | <filename>multi-user.target</filename> | |
488 | or | |
489 | <filename>graphical.target</filename>.</para> | |
490 | </listitem> | |
491 | </varlistentry> | |
9f235308 LP |
492 | <varlistentry> |
493 | <term><filename>shutdown.target</filename></term> | |
494 | <listitem> | |
495 | <para>A special target unit | |
496 | that terminates the services | |
497 | on system shutdown.</para> | |
498 | ||
499 | <para>Services that shall be | |
500 | terminated on system shutdown | |
bd3d19a4 LP |
501 | shall add Conflicts |
502 | dependencies to this unit for | |
3b6fdb5b LP |
503 | their service unit, which is |
504 | implicitly done when | |
505 | <varname>DefaultDependencies=yes</varname> | |
506 | is set (the default).</para> | |
9f235308 LP |
507 | |
508 | <para>systemd automatically | |
509 | adds dependencies of type | |
510 | Conflicts to this target unit | |
bd3d19a4 LP |
511 | for all SysV init script |
512 | service units that shall be | |
513 | terminated in SysV runlevels 0 | |
514 | or 6.</para> | |
9f235308 LP |
515 | </listitem> |
516 | </varlistentry> | |
517 | <varlistentry> | |
518 | <term><filename>sigpwr.target</filename></term> | |
519 | <listitem> | |
520 | <para>A special target that is | |
521 | started when systemd receives | |
522 | the SIGPWR process signal, | |
523 | which is normally sent by the | |
bd3d19a4 | 524 | kernel or UPS daemons when |
9f235308 LP |
525 | power fails.</para> |
526 | </listitem> | |
527 | </varlistentry> | |
528 | <varlistentry> | |
529 | <term><filename>sockets.target</filename></term> | |
530 | <listitem> | |
531 | <para>A special target unit | |
532 | that sets up all service | |
533 | sockets.</para> | |
534 | ||
535 | <para>Services that can be | |
536 | socket-activated shall add | |
bd3d19a4 LP |
537 | Wants dependencies to this |
538 | unit for their socket unit | |
9f235308 LP |
539 | during installation.</para> |
540 | </listitem> | |
541 | </varlistentry> | |
542 | <varlistentry> | |
543 | <term><filename>swap.target</filename></term> | |
544 | <listitem> | |
545 | <para>Similar to | |
546 | <filename>local-fs.target</filename>, but for swap | |
547 | partitions and swap | |
548 | files.</para> | |
549 | </listitem> | |
550 | </varlistentry> | |
f92a18f5 LP |
551 | <varlistentry> |
552 | <term><filename>sysinit.target</filename></term> | |
553 | <listitem> | |
554 | <para>A special target unit | |
555 | covering early boot-up scripts.</para> | |
556 | <para>systemd automatically | |
557 | adds dependencies of the types | |
558 | Wants and After for all | |
559 | SysV service units configured | |
560 | for runlevels that are not 0 | |
561 | to 6 to this target unit. | |
562 | This covers the special | |
563 | boot-up runlevels some | |
564 | distributions have, such as S | |
565 | or b.</para> | |
566 | </listitem> | |
567 | </varlistentry> | |
eeb7229c LP |
568 | <varlistentry> |
569 | <term><filename>@SPECIAL_SYSLOG_SERVICE@</filename></term> | |
570 | <listitem> | |
571 | <para>A special unit for the | |
572 | syslog daemon. As soon as | |
573 | this service is fully started | |
574 | up systemd will connect to it | |
575 | and use it for logging if it | |
576 | has been configured for | |
577 | that.</para> | |
62adf224 LP |
578 | |
579 | <para>Units should generally | |
580 | avoid depending on this unit | |
581 | directly and instead refer to | |
582 | the | |
eeb7229c | 583 | <filename>syslog.target</filename> |
62adf224 LP |
584 | unit instead, which pulls this |
585 | one in directly or indirectly | |
586 | via socket-based activation.</para> | |
587 | </listitem> | |
588 | </varlistentry> | |
589 | <varlistentry> | |
590 | <term><filename>syslog.target</filename></term> | |
591 | <listitem> | |
592 | <para>systemd automatically | |
593 | adds dependencies of type | |
594 | After for this target unit to | |
595 | all SysV init script service | |
596 | units with an LSB header | |
597 | referring to the | |
598 | <literal>$syslog</literal> | |
599 | facility.</para> | |
600 | ||
601 | <para>Administrators should | |
602 | ensure that this target pulls | |
603 | in a service unit with the | |
604 | name or alias of | |
605 | <filename>@SPECIAL_SYSLOG_SERVICE@</filename> | |
606 | (or a socket unit that | |
607 | activates this | |
608 | service).</para> | |
eeb7229c LP |
609 | </listitem> |
610 | </varlistentry> | |
9f235308 LP |
611 | <varlistentry> |
612 | <term><filename>systemd-initctl.service</filename></term> | |
613 | <listitem> | |
614 | <para>This provides | |
615 | compatibility with the SysV | |
616 | /dev/initctl file system FIFO | |
617 | for communication with the | |
618 | init system.</para> | |
619 | <para>This is a | |
620 | socket-activated service, see | |
621 | <filename>system-initctl.socket</filename>.</para> | |
622 | </listitem> | |
623 | </varlistentry> | |
624 | <varlistentry> | |
625 | <term><filename>systemd-initctl.socket</filename></term> | |
626 | <listitem> | |
627 | <para>Socket activation unit | |
628 | for | |
629 | <filename>system-initctl.service</filename>.</para> | |
630 | </listitem> | |
631 | </varlistentry> | |
632 | <varlistentry> | |
633 | <term><filename>systemd-logger.service</filename></term> | |
634 | <listitem> | |
bd3d19a4 | 635 | <para>This is internally used |
9f235308 | 636 | by systemd to provide syslog |
bd3d19a4 LP |
637 | logging to the processes it |
638 | maintains.</para> | |
9f235308 LP |
639 | <para>This is a |
640 | socket-activated service, see | |
641 | <filename>system-logger.socket</filename>.</para> | |
642 | </listitem> | |
643 | </varlistentry> | |
644 | <varlistentry> | |
645 | <term><filename>systemd-logger.socket</filename></term> | |
646 | <listitem> | |
647 | <para>Socket activation unit | |
648 | for | |
bd3d19a4 LP |
649 | <filename>system-logger.service</filename>. systemd |
650 | will automatically add | |
651 | dependencies of types Requires | |
652 | and After to all units that | |
653 | have been configured for | |
654 | stdout or stderr to be | |
655 | connected to syslog or the | |
656 | kernel log buffer.</para> | |
9f235308 | 657 | </listitem> |
5dc50792 LP |
658 | </varlistentry> |
659 | <varlistentry> | |
660 | <term><filename>systemd-shutdownd.service</filename></term> | |
661 | <listitem> | |
662 | <para>This is internally used | |
663 | by | |
664 | <citerefentry><refentrytitle>shutdown</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
665 | to implement delayed shutdowns.</para> | |
666 | <para>This is a | |
667 | socket-activated service, see | |
668 | <filename>system-shutdownd.socket</filename>.</para> | |
669 | </listitem> | |
670 | </varlistentry> | |
671 | <varlistentry> | |
672 | <term><filename>systemd-shutdownd.socket</filename></term> | |
673 | <listitem> | |
674 | <para>Socket activation unit | |
675 | for | |
676 | <filename>system-shutdownd.service</filename>.</para> | |
677 | </listitem> | |
9f235308 | 678 | </varlistentry> |
3b6fdb5b LP |
679 | <varlistentry> |
680 | <term><filename>umount.target</filename></term> | |
681 | <listitem> | |
682 | <para>A special target unit | |
683 | that umounts all mount and | |
684 | automount points on system | |
685 | shutdown.</para> | |
686 | ||
687 | <para>Mounts that shall be | |
688 | unmounted on system shutdown | |
689 | shall add Conflicts | |
690 | dependencies to this unit for | |
691 | their mount unit, which is | |
692 | implicitly done when | |
693 | <varname>DefaultDependencies=yes</varname> | |
694 | is set (the default).</para> | |
695 | </listitem> | |
696 | </varlistentry> | |
9f235308 LP |
697 | </variablelist> |
698 | </refsect1> | |
699 | ||
700 | <refsect1> | |
701 | <title>Special Session Units</title> | |
702 | ||
703 | <para>When systemd runs as a service instance, the | |
704 | following special units are available, which have | |
705 | similar definitions as their system counterparts: | |
bd3d19a4 | 706 | <filename>default.target</filename>, |
9f235308 LP |
707 | <filename>local-fs.target</filename>, |
708 | <filename>remote-fs.target</filename>, | |
709 | <filename>shutdown.target</filename>, | |
710 | <filename>sockets.target</filename>, | |
711 | <filename>swap.target</filename>.</para> | |
a1b256b0 LP |
712 | |
713 | <para>In addition the following special unit is | |
714 | understood only when systemd runs as service instance:</para> | |
715 | ||
716 | <variablelist> | |
717 | <varlistentry> | |
718 | <term><filename>exit.service</filename></term> | |
719 | <listitem> | |
720 | <para>A special service unit | |
721 | for shutting down the | |
722 | session.</para> | |
723 | ||
724 | <para>Applications wanting to | |
725 | terminate the session should | |
726 | start this unit. If systemd | |
727 | receives SIGTERM or SIGINT | |
728 | when running as session daemon | |
729 | it will start this | |
730 | unit.</para> | |
731 | ||
732 | <para>Normally, this pulls in | |
733 | <filename>shutdown.target</filename> | |
734 | which in turn should be | |
735 | conflicted by all units that | |
736 | want to be shut down on | |
737 | session exit.</para> | |
738 | </listitem> | |
739 | </varlistentry> | |
740 | </variablelist> | |
9f235308 LP |
741 | </refsect1> |
742 | ||
743 | <refsect1> | |
744 | <title>See Also</title> | |
745 | <para> | |
5dc50792 LP |
746 | <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>, |
747 | <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
748 | <citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
9f235308 LP |
749 | <citerefentry><refentrytitle>systemd.target</refentrytitle><manvolnum>5</manvolnum></citerefentry> |
750 | </para> | |
751 | </refsect1> | |
752 | ||
753 | </refentry> |