source: chapter08/systemd.xml@ 2efe1e8

12.0 12.0-rc1 12.1 12.1-rc1 bdubbs/gcc13 multilib renodr/libudev-from-systemd trunk xry111/arm64 xry111/arm64-12.0 xry111/clfs-ng xry111/loongarch xry111/loongarch-12.0 xry111/loongarch-12.1 xry111/mips64el xry111/update-glibc
Last change on this file since 2efe1e8 was 2efe1e8, checked in by Xi Ruoyao <xry111@…>, 14 months ago

systemd: Document systemd-ac-power

It has been moved to /usr/bin for general use by upstream, so list it in
programs.

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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-system-systemd" role="wrap" revision="systemd">
9 <?dbhtml filename="systemd.html"?>
10
11 <sect1info condition="script">
12 <productname>systemd</productname>
13 <productnumber>&systemd-version;</productnumber>
14 <address>&systemd-url;</address>
15 </sect1info>
16
17 <title>Systemd-&systemd-version;</title>
18
19 <indexterm zone="ch-system-systemd">
20 <primary sortas="a-systemd">systemd</primary>
21 </indexterm>
22
23 <sect2 role="package">
24 <title/>
25
26 <para>The systemd package contains programs for controlling the startup,
27 running, and shutdown of the system.</para>
28
29 <segmentedlist>
30 <segtitle>&buildtime;</segtitle>
31 <segtitle>&diskspace;</segtitle>
32
33 <seglistitem>
34 <seg>&systemd-fin-sbu;</seg>
35 <seg>&systemd-fin-du;</seg>
36 </seglistitem>
37 </segmentedlist>
38 </sect2>
39
40 <sect2 role="installation">
41 <title>Installation of systemd</title>
42
43 <para>Remove two unneeded groups,
44 <systemitem class="groupname">render</systemitem> and
45 <systemitem class="groupname">sgx</systemitem>, from the default udev
46 rules:</para>
47
48 <screen><userinput remap="pre">sed -i -e 's/GROUP="render"/GROUP="video"/' \
49 -e 's/GROUP="sgx", //' rules.d/50-udev-default.rules.in</userinput></screen>
50
51 <para>Prepare systemd for compilation:</para>
52
53<screen><userinput remap="configure">mkdir -p build
54cd build
55
56meson --prefix=/usr \
57 --buildtype=release \
58 -Ddefault-dnssec=no \
59 -Dfirstboot=false \
60 -Dinstall-tests=false \
61 -Dldconfig=false \
62 -Dsysusers=false \
63 -Drpmmacrosdir=no \
64 -Dhomed=false \
65 -Duserdb=false \
66 -Dman=false \
67 -Dmode=release \
68 -Dpamconfdir=no \
69 -Ddocdir=/usr/share/doc/systemd-&systemd-version; \
70 ..</userinput></screen>
71
72 <variablelist>
73 <title>The meaning of the meson options:</title>
74
75 <varlistentry>
76 <term><parameter>--buildtype=release</parameter></term>
77 <listitem>
78 <para>This switch overrides the default buildtype
79 (<quote>debug</quote>), which produces unoptimized
80 binaries.</para>
81 </listitem>
82 </varlistentry>
83
84 <varlistentry>
85 <term><parameter>-Ddefault-dnssec=no</parameter></term>
86 <listitem>
87 <para>This switch turns off the experimental DNSSEC support.</para>
88 </listitem>
89 </varlistentry>
90
91 <varlistentry>
92 <term><parameter>-Dfirstboot=false</parameter></term>
93 <listitem>
94 <para>This switch prevents installation of systemd
95 services responsible for setting up the system for
96 the first time. These are not useful in LFS, because
97 everything is done manually.</para>
98 </listitem>
99 </varlistentry>
100
101 <varlistentry>
102 <term><parameter>-Dinstall-tests=false</parameter></term>
103 <listitem>
104 <para>This switch prevents installation of the compiled tests.</para>
105 </listitem>
106 </varlistentry>
107
108 <varlistentry>
109 <term><parameter>-Dldconfig=false</parameter></term>
110 <listitem>
111 <para>This switch prevents installation of a systemd unit that runs
112 <command>ldconfig</command> at boot; this is not useful for source
113 distributions such as LFS, and makes the boot time longer. Remove
114 this option to enable running <command>ldconfig</command> at boot.</para>
115 </listitem>
116 </varlistentry>
117
118 <varlistentry>
119 <term><parameter>-Dsysusers=false</parameter></term>
120 <listitem>
121 <para>This switch prevents installation of systemd
122 services responsible for setting up the
123 <filename>/etc/group</filename> and
124 <filename>/etc/passwd</filename> files. Both files
125 were created in the previous chapter. This daemon is not useful
126 on an LFS system since user accounts are manually created.</para>
127 </listitem>
128 </varlistentry>
129
130 <varlistentry>
131 <term><parameter>-Drpmmacrosdir=no</parameter></term>
132 <listitem>
133 <para>This switch disables installation of RPM Macros
134 for use with systemd, because LFS does not support RPM.</para>
135 </listitem>
136 </varlistentry>
137
138 <varlistentry>
139 <term><parameter>-D{userdb,homed}=false</parameter></term>
140 <listitem>
141 <para>Remove two daemons with dependencies that do not fit
142 within the scope of LFS.</para>
143 </listitem>
144 </varlistentry>
145
146 <varlistentry>
147 <term><parameter>-Dman=false</parameter></term>
148 <listitem>
149 <para>Prevent the generation of man pages to avoid extra
150 dependencies. We will install pre-generated man pages for systemd
151 from a tarball.</para>
152 </listitem>
153 </varlistentry>
154
155 <varlistentry>
156 <term><parameter>-Dmode=release</parameter></term>
157 <listitem>
158 <para>Disable some features considered experimental by upstream.
159 </para>
160 </listitem>
161 </varlistentry>
162
163 <varlistentry>
164 <term><parameter>-Dpamconfdir=no</parameter></term>
165 <listitem>
166 <para>Prevent the installation of a PAM configuration file not
167 functional on LFS.</para>
168 </listitem>
169 </varlistentry>
170 </variablelist>
171
172 <para>Compile the package:</para>
173
174<screen><userinput remap="make">ninja</userinput></screen>
175
176 <para>Install the package:</para>
177
178<screen><userinput remap="install">ninja install</userinput></screen>
179
180 <para>Install the man pages:</para>
181
182 <!-- Please make sure systemd man pages tarball has a common leading
183 component in the path. -->
184<screen><userinput remap="install">tar -xf ../../systemd-man-pages-&systemd-man-version;.tar.xz --strip-components=1 -C /usr/share/man</userinput></screen>
185
186 <para>Create the <filename>/etc/machine-id</filename> file needed by
187 <command>systemd-journald</command>:</para>
188
189<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
190
191 <para>Set up the basic target structure:</para>
192
193<screen><userinput remap="adjust">systemctl preset-all</userinput></screen>
194
195 <para>Disable two services for upgrading binary distros. They are useless for
196 a basic Linux system built from source, and each one will report an error if
197 it's enabled but not configured:</para>
198
199<screen><userinput remap="adjust">systemctl disable systemd-sysupdate{,-reboot}</userinput></screen>
200
201<!-- dev: 50-pid-max.conf is not removed in BLFS, so I commented the following out.
202 If it causes any trouble, we can add this back and also copy it into BLFS -->
203<!--
204 <para>Prevent systemd from resetting the maximum PID value which causes
205 some problems with packages and units in BLFS:</para>
206
207<screen><userinput remap="adjust">rm -f /usr/lib/sysctl.d/50-pid-max.conf</userinput></screen>
208-->
209
210 </sect2>
211
212 <sect2 id="contents-systemd" role="content">
213 <title>Contents of systemd</title>
214
215 <segmentedlist>
216 <segtitle>Installed programs</segtitle>
217 <segtitle>Installed libraries</segtitle>
218 <segtitle>Installed directories</segtitle>
219
220 <seglistitem>
221 <seg>busctl, coredumpctl, halt (symlink to systemctl),
222 hostnamectl, init, journalctl, kernel-install, localectl, loginctl,
223 machinectl, networkctl, oomctl, portablectl, poweroff (symlink to
224 systemctl), reboot (symlink to systemctl), resolvconf (symlink to
225 resolvectl), resolvectl, runlevel (symlink to systemctl), shutdown
226 (symlink to systemctl), systemctl, systemd-ac-power, systemd-analyze,
227 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
228 systemd-creds, systemd-delta, systemd-detect-virt,
229 systemd-dissect, systemd-escape, systemd-hwdb, systemd-id128,
230 systemd-inhibit, systemd-machine-id-setup,
231 systemd-mount, systemd-notify, systemd-nspawn, systemd-path,
232 systemd-repart, systemd-resolve (symlink to resolvectl), systemd-run,
233 systemd-socket-activate, systemd-stdio-bridge, systemd-sysext,
234 systemd-tmpfiles, systemd-tty-ask-password-agent,
235 systemd-umount (symlink to systemd-mount),
236 telinit (symlink to systemctl), timedatectl, and udevadm</seg>
237 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
238 libnss_resolve.so.2, libnss_systemd.so.2,
239 libsystemd.so, libsystemd-shared-&systemd-version;.so (in /usr/lib/systemd),
240 and libudev.so</seg>
241 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
242 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
243 /etc/xdg/systemd, /usr/lib/systemd, /usr/lib/udev, /usr/include/systemd,
244 /usr/lib/binfmt.d, /usr/lib/environment.d, /usr/lib/kernel,
245 /usr/lib/modules-load.d, /usr/lib/sysctl.d, /usr/lib/systemd,
246 /usr/lib/tmpfiles.d,
247 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
248 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
249 </seglistitem>
250 </segmentedlist>
251
252 <variablelist>
253 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
254 <?dbfo list-presentation="list"?>
255 <?dbhtml list-presentation="table"?>
256
257 <varlistentry id="busctl">
258 <term><command>busctl</command></term>
259 <listitem>
260 <para>Is used to introspect and monitor the D-Bus bus</para>
261 <indexterm zone="ch-system-systemd busctl">
262 <primary sortas="b-busctl">busctl</primary>
263 </indexterm>
264 </listitem>
265 </varlistentry>
266
267 <varlistentry id="coredumpctl">
268 <term><command>coredumpctl</command></term>
269 <listitem>
270 <para>Is used to retrieve coredumps from the systemd journal</para>
271 <indexterm zone="ch-system-systemd coredumpctl">
272 <primary sortas="b-coredumpctl">coredumpctl</primary>
273 </indexterm>
274 </listitem>
275 </varlistentry>
276
277 <varlistentry id="halt">
278 <term><command>halt</command></term>
279 <listitem>
280 <para>Normally invokes <command>shutdown</command> with the
281 <parameter>-h</parameter> option, except when already in run-level 0,
282 when it tells the kernel to halt the system; it notes in the
283 file <filename>/var/log/wtmp</filename> that the system is being
284 brought down</para>
285 <indexterm zone="ch-system-systemd halt">
286 <primary sortas="b-halt">halt</primary>
287 </indexterm>
288 </listitem>
289 </varlistentry>
290
291 <varlistentry id="hostnamectl">
292 <term><command>hostnamectl</command></term>
293 <listitem>
294 <para>Is used to query and change the system hostname and related
295 settings</para>
296 <indexterm zone="ch-system-systemd hostnamectl">
297 <primary sortas="b-hostnamectl">hostnamectl</primary>
298 </indexterm>
299 </listitem>
300 </varlistentry>
301
302 <varlistentry id="init">
303 <term><command>init</command></term>
304 <listitem>
305 <para>Is the first process to be started after the kernel has initialized
306 the hardware; <command>init</command> takes over the boot process and starts the
307 processes specified by its configuration files; in this case, it starts
308 systemd</para>
309 <indexterm zone="ch-system-systemd init">
310 <primary sortas="b-init">init</primary>
311 </indexterm>
312 </listitem>
313 </varlistentry>
314
315 <varlistentry id="journalctl">
316 <term><command>journalctl</command></term>
317 <listitem>
318 <para>Is used to query the contents of the systemd journal</para>
319 <indexterm zone="ch-system-systemd journalctl">
320 <primary sortas="b-journalctl">journalctl</primary>
321 </indexterm>
322 </listitem>
323 </varlistentry>
324
325 <varlistentry id="kernel-install">
326 <term><command>kernel-install</command></term>
327 <listitem>
328 <para>Is used to add and remove kernel and initramfs images to and
329 from /boot; in LFS, this is done manually</para>
330 <indexterm zone="ch-system-systemd kernel-install">
331 <primary sortas="b-kernel-install">kernel-install</primary>
332 </indexterm>
333 </listitem>
334 </varlistentry>
335
336 <varlistentry id="localectl">
337 <term><command>localectl</command></term>
338 <listitem>
339 <para>Is used to query and change the system locale and keyboard layout
340 settings</para>
341 <indexterm zone="ch-system-systemd localectl">
342 <primary sortas="b-localectl">localectl</primary>
343 </indexterm>
344 </listitem>
345 </varlistentry>
346
347 <varlistentry id="loginctl">
348 <term><command>loginctl</command></term>
349 <listitem>
350 <para>Is used to introspect and control the state of the systemd Login
351 Manager</para>
352 <indexterm zone="ch-system-systemd loginctl">
353 <primary sortas="b-loginctl">loginctl</primary>
354 </indexterm>
355 </listitem>
356 </varlistentry>
357
358 <varlistentry id="machinectl">
359 <term><command>machinectl</command></term>
360 <listitem>
361 <para>Is used to introspect and control the state of the systemd Virtual
362 Machine and Container Registration Manager</para>
363 <indexterm zone="ch-system-systemd machinectl">
364 <primary sortas="b-machinectl">machinectl</primary>
365 </indexterm>
366 </listitem>
367 </varlistentry>
368
369 <varlistentry id="networkctl">
370 <term><command>networkctl</command></term>
371 <listitem>
372 <para>Is used to introspect and configure the state of the network
373 links configured by systemd-networkd</para>
374 <indexterm zone="ch-system-systemd networkctl">
375 <primary sortas="b-networkctl">networkctl</primary>
376 </indexterm>
377 </listitem>
378 </varlistentry>
379
380 <varlistentry id="oomctl">
381 <term><command>oomctl</command></term>
382 <listitem>
383 <para>Controls the systemd Out Of Memory daemon</para>
384 <indexterm zone="ch-system-systemd oomctl">
385 <primary sortas="b-oomctl">oomctl</primary>
386 </indexterm>
387 </listitem>
388 </varlistentry>
389
390 <varlistentry id="portablectl">
391 <term><command>portablectl</command></term>
392 <listitem>
393 <para>Is used to attach or detach portable services from the local
394 system</para>
395 <indexterm zone="ch-system-systemd portablectl">
396 <primary sortas="b-portablectl">portablectl</primary>
397 </indexterm>
398 </listitem>
399 </varlistentry>
400
401 <varlistentry id="poweroff">
402 <term><command>poweroff</command></term>
403 <listitem>
404 <para>Instructs the kernel to halt the system and switch off the computer
405 (see <command>halt</command>)</para>
406 <indexterm zone="ch-system-systemd poweroff">
407 <primary sortas="b-poweroff">poweroff</primary>
408 </indexterm>
409 </listitem>
410 </varlistentry>
411
412 <varlistentry id="reboot">
413 <term><command>reboot</command></term>
414 <listitem>
415 <para>Instructs the kernel to reboot the system (see
416 <command>halt</command>)</para>
417 <indexterm zone="ch-system-systemd reboot">
418 <primary sortas="b-reboot">reboot</primary>
419 </indexterm>
420 </listitem>
421 </varlistentry>
422
423 <varlistentry id="resolvconf">
424 <term><command>resolvconf</command></term>
425 <listitem>
426 <para>Registers DNS server and domain configuration with
427 <command>systemd-resolved</command></para>
428 <indexterm zone="ch-system-systemd resolvconf">
429 <primary sortas="b-resolvconf">resolvconf</primary>
430 </indexterm>
431 </listitem>
432 </varlistentry>
433
434 <varlistentry id="resolvectl">
435 <term><command>resolvectl</command></term>
436 <listitem>
437 <para>Sends control commands to the network name resolution
438 manager, or resolves domain names, IPv4 and IPv6 addresses,
439 DNS records, and services</para>
440 <indexterm zone="ch-system-systemd resolvectl">
441 <primary sortas="b-resolvectl">resolvectl</primary>
442 </indexterm>
443 </listitem>
444 </varlistentry>
445
446 <varlistentry id="runlevel">
447 <term><command>runlevel</command></term>
448 <listitem>
449 <para>Outputs the previous and the current run-level, as noted in the
450 last run-level record in <filename>/run/utmp</filename></para>
451 <indexterm zone="ch-system-systemd runlevel">
452 <primary sortas="b-runlevel">runlevel</primary>
453 </indexterm>
454 </listitem>
455 </varlistentry>
456
457 <varlistentry id="shutdown">
458 <term><command>shutdown</command></term>
459 <listitem>
460 <para>Brings the system down in a safe and secure manner, signaling
461 all processes and notifying all logged-in users</para>
462 <indexterm zone="ch-system-systemd shutdown">
463 <primary sortas="b-shutdown">shutdown</primary>
464 </indexterm>
465 </listitem>
466 </varlistentry>
467
468 <varlistentry id="systemctl">
469 <term><command>systemctl</command></term>
470 <listitem>
471 <para>Is used to introspect and control the state of the systemd system
472 and service manager</para>
473 <indexterm zone="ch-system-systemd systemctl">
474 <primary sortas="b-systemctl">systemctl</primary>
475 </indexterm>
476 </listitem>
477 </varlistentry>
478
479 <varlistentry id="systemd-ac-power">
480 <term><command>systemd-ac-power</command></term>
481 <listitem>
482 <para>Reports whether the system is connected to an external
483 power source.</para>
484 <indexterm zone="ch-system-systemd systemd-ac-power">
485 <primary sortas="b-systemd-ac-power">systemd-ac-power</primary>
486 </indexterm>
487 </listitem>
488 </varlistentry>
489
490 <varlistentry id="systemd-analyze">
491 <term><command>systemd-analyze</command></term>
492 <listitem>
493 <para>Is used to analyze system startup performance,
494 as well as identify troublesome systemd units</para>
495 <indexterm zone="ch-system-systemd systemd-analyze">
496 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
497 </indexterm>
498 </listitem>
499 </varlistentry>
500
501 <varlistentry id="systemd-ask-password">
502 <term><command>systemd-ask-password</command></term>
503 <listitem>
504 <para>Is used to query a system password or passphrase from the user,
505 using a message specified on the Linux command line</para>
506 <indexterm zone="ch-system-systemd systemd-ask-password">
507 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
508 </indexterm>
509 </listitem>
510 </varlistentry>
511
512 <varlistentry id="systemd-cat">
513 <term><command>systemd-cat</command></term>
514 <listitem>
515 <para>Is used to connect the STDOUT and STDERR outputs of a process
516 with the systemd journal
517 </para>
518 <indexterm zone="ch-system-systemd systemd-cat">
519 <primary sortas="b-systemd-cat">systemd-cat</primary>
520 </indexterm>
521 </listitem>
522 </varlistentry>
523
524 <varlistentry id="systemd-cgls">
525 <term><command>systemd-cgls</command></term>
526 <listitem>
527 <para>Recursively shows the contents of the selected Linux control
528 group hierarchy in a tree</para>
529 <indexterm zone="ch-system-systemd systemd-cgls">
530 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
531 </indexterm>
532 </listitem>
533 </varlistentry>
534
535 <varlistentry id="systemd-cgtop">
536 <term><command>systemd-cgtop</command></term>
537 <listitem>
538 <para>Shows the top control groups of the local Linux control group
539 hierarchy, ordered by their CPU, memory and disk I/O loads</para>
540 <indexterm zone="ch-system-systemd systemd-cgtop">
541 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
542 </indexterm>
543 </listitem>
544 </varlistentry>
545
546 <varlistentry id="systemd-creds">
547 <term><command>systemd-creds</command></term>
548 <listitem>
549 <para>Displays and processes credentials</para>
550 <indexterm zone="ch-system-systemd systemd-creds">
551 <primary sortas="b-systemd-creds">systemd-creds</primary>
552 </indexterm>
553 </listitem>
554 </varlistentry>
555
556 <varlistentry id="systemd-delta">
557 <term><command>systemd-delta</command></term>
558 <listitem>
559 <para>Is used to identify and compare configuration files in
560 <filename class="directory">/etc</filename> that override the defaults
561 in <filename class="directory">/usr</filename></para>
562 <indexterm zone="ch-system-systemd systemd-delta">
563 <primary sortas="b-systemd-delta">systemd-delta</primary>
564 </indexterm>
565 </listitem>
566 </varlistentry>
567
568 <varlistentry id="systemd-detect-virt">
569 <term><command>systemd-detect-virt</command></term>
570 <listitem>
571 <para>Detects whether the system is being run in a virtual
572 environment, and adjusts udev accordingly</para>
573 <indexterm zone="ch-system-systemd systemd-detect-virt">
574 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
575 </indexterm>
576 </listitem>
577 </varlistentry>
578
579 <varlistentry id="systemd-dissect">
580 <term><command>systemd-dissect</command></term>
581 <listitem>
582 <para>Is used to inspect OS disk images</para>
583 <indexterm zone="ch-system-systemd systemd-dissect">
584 <primary sortas="b-systemd-dissect">systemd-dissect</primary>
585 </indexterm>
586 </listitem>
587 </varlistentry>
588
589 <varlistentry id="systemd-escape">
590 <term><command>systemd-escape</command></term>
591 <listitem>
592 <para>Is used to escape strings for inclusion in systemd unit
593 names</para>
594 <indexterm zone="ch-system-systemd systemd-escape">
595 <primary sortas="b-systemd-escape">systemd-escape</primary>
596 </indexterm>
597 </listitem>
598 </varlistentry>
599
600 <varlistentry id="systemd-hwdb">
601 <term><command>systemd-hwdb</command></term>
602 <listitem>
603 <para>Is used to manage the hardware database (hwdb)</para>
604 <indexterm zone="ch-system-systemd systemd-hwdb">
605 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
606 </indexterm>
607 </listitem>
608 </varlistentry>
609
610 <varlistentry id="systemd-id128">
611 <term><command>systemd-id128</command></term>
612 <listitem>
613 <para>Generates and prints id128 (UUID) strings</para>
614 <indexterm zone="ch-system-systemd systemd-id128">
615 <primary sortas="b-systemd-id128">systemd-id128</primary>
616 </indexterm>
617 </listitem>
618 </varlistentry>
619
620 <varlistentry id="systemd-inhibit">
621 <term><command>systemd-inhibit</command></term>
622 <listitem>
623 <para>Is used to execute a program with a shutdown, sleep or idle
624 inhibitor lock taken, preventing an action such as a system shutdown
625 until the process is completed</para>
626 <indexterm zone="ch-system-systemd systemd-inhibit">
627 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
628 </indexterm>
629 </listitem>
630 </varlistentry>
631
632 <varlistentry id="systemd-machine-id-setup">
633 <term><command>systemd-machine-id-setup</command></term>
634 <listitem>
635 <para>Is used by system installer tools to initialize the machine ID
636 stored in <filename>/etc/machine-id</filename> at install time with a
637 randomly generated ID</para>
638 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
639 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
640 </indexterm>
641 </listitem>
642 </varlistentry>
643
644 <varlistentry id="systemd-mount">
645 <term><command>systemd-mount</command></term>
646 <listitem>
647 <para>Is used to temporarily mount or automount disks</para>
648 <indexterm zone="ch-system-systemd systemd-mount">
649 <primary sortas="b-systemd-mount">systemd-mount</primary>
650 </indexterm>
651 </listitem>
652 </varlistentry>
653
654 <varlistentry id="systemd-notify">
655 <term><command>systemd-notify</command></term>
656 <listitem>
657 <para>Is used by daemon scripts to notify the init system of status
658 changes</para>
659 <indexterm zone="ch-system-systemd systemd-notify">
660 <primary sortas="b-systemd-notify">systemd-notify</primary>
661 </indexterm>
662 </listitem>
663 </varlistentry>
664
665 <varlistentry id="systemd-nspawn">
666 <term><command>systemd-nspawn</command></term>
667 <listitem>
668 <para>Is used to run a command, or an entire OS, in a light-weight namespace
669 container</para>
670 <indexterm zone="ch-system-systemd systemd-nspawn">
671 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
672 </indexterm>
673 </listitem>
674 </varlistentry>
675
676 <varlistentry id="systemd-path">
677 <term><command>systemd-path</command></term>
678 <listitem>
679 <para>Is used to query system and user paths</para>
680 <indexterm zone="ch-system-systemd systemd-path">
681 <primary sortas="b-systemd-path">systemd-path</primary>
682 </indexterm>
683 </listitem>
684 </varlistentry>
685
686 <varlistentry id="systemd-repart">
687 <term><command>systemd-repart</command></term>
688 <listitem>
689 <para>Is used to grow and add partitions to a partition table when
690 systemd is used with an OS image (e.g. a container)</para>
691 <indexterm zone="ch-system-systemd systemd-repart">
692 <primary sortas="b-systemd-repart">systemd-repart</primary>
693 </indexterm>
694 </listitem>
695 </varlistentry>
696
697 <varlistentry id="systemd-resolve">
698 <term><command>systemd-resolve</command></term>
699 <listitem>
700 <para>Is used to resolve domain names, IPV4 and IPv6 addresses, DNS
701 resource records, and services</para>
702 <indexterm zone="ch-system-systemd systemd-resolve">
703 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
704 </indexterm>
705 </listitem>
706 </varlistentry>
707
708 <varlistentry id="systemd-run">
709 <term><command>systemd-run</command></term>
710 <listitem>
711 <para>Is used to create and start a transient .service or a .scope
712 unit and run the specified command in it; this is useful for
713 validating systemd units</para>
714 <indexterm zone="ch-system-systemd systemd-run">
715 <primary sortas="b-systemd-run">systemd-run</primary>
716 </indexterm>
717 </listitem>
718 </varlistentry>
719
720 <varlistentry id="systemd-socket-activate">
721 <term><command>systemd-socket-activate</command></term>
722 <listitem>
723 <para>Is used to listen on socket devices and launch a process upon
724 a successful connection to the socket</para>
725 <indexterm zone="ch-system-systemd systemd-socket-activate">
726 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
727 </indexterm>
728 </listitem>
729 </varlistentry>
730
731 <varlistentry id="systemd-sysext">
732 <term><command>systemd-sysext</command></term>
733 <listitem>
734 <para>Activates system extension images</para>
735 <indexterm zone="ch-system-systemd systemd-sysext">
736 <primary sortas="b-systemd-sysext">systemd-sysext</primary>
737 </indexterm>
738 </listitem>
739 </varlistentry>
740
741 <varlistentry id="systemd-tmpfiles">
742 <term><command>systemd-tmpfiles</command></term>
743 <listitem>
744 <para>Creates, deletes, and cleans up volatile and temporary files and
745 directories, based on the configuration file format and location
746 specified in
747 <filename class="directory">tmpfiles.d</filename> directories</para>
748 <indexterm zone="ch-system-systemd systemd-tmpfiles">
749 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
750 </indexterm>
751 </listitem>
752 </varlistentry>
753
754 <varlistentry id="systemd-umount">
755 <term><command>systemd-umount</command></term>
756 <listitem>
757 <para>Unmounts mount points</para>
758 <indexterm zone="ch-system-systemd systemd-umount">
759 <primary sortas="b-systemd-umount">systemd-umount</primary>
760 </indexterm>
761 </listitem>
762 </varlistentry>
763
764 <varlistentry id="systemd-tty-ask-password-agent">
765 <term><command>systemd-tty-ask-password-agent</command></term>
766 <listitem>
767 <para>Is used to list and/or process pending systemd password
768 requests</para>
769 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
770 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
771 </indexterm>
772 </listitem>
773 </varlistentry>
774
775 <varlistentry id="telinit">
776 <term><command>telinit</command></term>
777 <listitem>
778 <para>Tells <command>init</command> which run-level to change
779 to</para>
780 <indexterm zone="ch-system-systemd telinit">
781 <primary sortas="b-telinit">telinit</primary>
782 </indexterm>
783 </listitem>
784 </varlistentry>
785
786 <varlistentry id="timedatectl">
787 <term><command>timedatectl</command></term>
788 <listitem>
789 <para>Is used to query and change the system clock and its settings
790 </para>
791 <indexterm zone="ch-system-systemd timedatectl">
792 <primary sortas="b-timedatectl">timedatectl</primary>
793 </indexterm>
794 </listitem>
795 </varlistentry>
796
797 <varlistentry id="udevadm">
798 <term><command>udevadm</command></term>
799 <listitem>
800 <para>Is a generic udev administration tool which controls the udevd
801 daemon, provides info from the udev hardware database, monitors
802 uevents, waits for uevents to finish, tests udev configuration, and
803 triggers uevents for a given device</para>
804 <indexterm zone="ch-system-systemd udevadm">
805 <primary sortas="b-udevadm">udevadm</primary>
806 </indexterm>
807 </listitem>
808 </varlistentry>
809
810 <varlistentry id="libsystemd">
811 <term><filename class="libraryfile">libsystemd</filename></term>
812 <listitem>
813 <para>Is the main systemd utility library</para>
814 <indexterm zone="ch-system-systemd libsystemd">
815 <primary sortas="c-libsystemd">libsystemd</primary>
816 </indexterm>
817 </listitem>
818 </varlistentry>
819
820 <varlistentry id="libudev">
821 <term><filename class="libraryfile">libudev</filename></term>
822 <listitem>
823 <para>Is a library to access Udev device information</para>
824 <indexterm zone="ch-system-systemd libudev">
825 <primary sortas="c-libudev">libudev</primary>
826 </indexterm>
827 </listitem>
828 </varlistentry>
829
830 </variablelist>
831
832 </sect2>
833
834</sect1>
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