source: chapter06/systemd.xml@ f1e1fe6

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Last change on this file since f1e1fe6 was f1e1fe6, checked in by DJ Lucas <dj@…>, 6 years ago

Simplify linking for systemd and remove text references to /tools/include.

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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-ch6-sbu;</seg>
35 <seg>&systemd-ch6-du;</seg>
36 </seglistitem>
37 </segmentedlist>
38 </sect2>
39
40 <sect2 role="installation">
41 <title>Installation of systemd</title>
42
43 <para>Create a symlink to work around missing xsltproc:</para>
44
45<screen><userinput remap="pre">ln -s /tools/bin/true /usr/bin/xsltproc</userinput></screen>
46
47 <para>Prepare systemd for compilation:</para>
48
49 <screen><userinput remap="configure">
50LANG=en_US.UTF-8 meson --prefix=/usr \
51 --sysconfdir /etc \
52 --localstatedir /var \
53 -Dblkid=true \
54 -Dbuildtype=release \
55 -Ddefault-dnssec=no \
56 -Dfirstboot=false \
57 -Dkill-path=/bin/kill \
58 -Dkmod-path=/bin/kmod \
59 -Dldconfig=false \
60 -Dmount-path=/bin/mount \
61 -Drootprefix= \
62 -Drootlibdir=/lib \
63 -Dsplit-usr=true \
64 -Dsulogin-path=/sbin/sulogin \
65 -Dsysusers=false \
66 -Dumount-path=/bin/umount \
67 -Db_lto=false \
68 $PWD build</userinput></screen>
69
70 <variablelist>
71 <title>The meaning of the meson options:</title>
72
73 <varlistentry>
74 <term><parameter>-D*-path=*</parameter></term>
75 <listitem>
76 <para>These switches provide location of binaries needed by
77 systemd at runtime that have not yet been installed, or who's
78 pkgconfig files are currently only in
79 <filename>/tools/lib/pkgconfig</filename>.</para>
80 </listitem>
81 </varlistentry>
82
83 <varlistentry>
84 <term><parameter>-Ddefault-dnssec=no</parameter></term>
85 <listitem>
86 <para>This switch turns off the experimental DNSSEC support.</para>
87 </listitem>
88 </varlistentry>
89
90 <varlistentry>
91 <term><parameter>-Dfirstboot=false</parameter></term>
92 <listitem>
93 <para>This switch prevents installation of systemd
94 services responsible for setting up the system for
95 the first time. They are not useful for LFS because
96 everything is done manually.</para>
97 </listitem>
98 </varlistentry>
99
100 <varlistentry>
101 <term><parameter>-Dldconfig=no</parameter></term>
102 <listitem>
103 <para>This switch prevents installation of a systemd
104 unit that runs <command>ldconfig</command> at
105 boot, making the boot time longer. Remove it if the
106 described feature is desired, even though it's not
107 useful for source distributions such as LFS.</para>
108 </listitem>
109 </varlistentry>
110
111 <varlistentry>
112 <term><parameter>-Droot*</parameter></term>
113 <listitem>
114 <para>These switches ensure that core programs and
115 shared libraries are installed in the subdirectories
116 of the root partition.</para>
117 </listitem>
118 </varlistentry>
119
120 <varlistentry>
121 <term><parameter>-Dsplit-usr=true</parameter></term>
122 <listitem>
123 <para>This switch ensures that systemd will work on
124 systems where /bin, /lib and /sbin directories are not
125 symlinks to their /usr counterparts.</para>
126 </listitem>
127 </varlistentry>
128
129 <varlistentry>
130 <term><parameter>-Dsysusers=false</parameter></term>
131 <listitem>
132 <para>This switch prevents installation of systemd
133 services responsible for setting up the
134 <filename>/etc/group</filename> and
135 <filename>/etc/passwd</filename> files. Both files
136 were created early in this chapter.</para>
137 </listitem>
138 </varlistentry>
139
140 </variablelist>
141
142 <para>Compile the package:</para>
143
144<screen><userinput remap="make">tar -xf ../systemd-man-pages-&systemd-version;.tar.xz
145cd build
146LANG=en_US.UTF-8 ninja</userinput></screen>
147<!--
148 <para>To test the package, execute the following command:</para>
149
150<screen><userinput remap="test">LANG=en_US.UTF-8 ninja test</userinput></screen>
151-->
152 <para>Install the package:</para>
153
154<screen><userinput remap="install">LANG=en_US.UTF-8 ninja install</userinput></screen>
155
156 <para>Remove an unnecessary directory:</para>
157
158<screen><userinput remap="install">rm -rfv /usr/lib/rpm</userinput></screen>
159
160 <para>Create the Sysvinit compatibility symlinks, so systemd is used
161 as the default init system:</para>
162
163<screen><userinput remap="install">for tool in runlevel reboot shutdown poweroff halt telinit; do
164 ln -sfv ../bin/systemctl /sbin/${tool}
165done
166ln -sfv ../lib/systemd/systemd /sbin/init</userinput></screen>
167
168 <para>Remove our earlier created symlink for xsltproc:</para>
169
170<screen><userinput remap="install">rm -f /usr/bin/xsltproc</userinput></screen>
171
172 <para>Create the <filename>/etc/machine-id</filename> file needed by
173 <command>systemd-journald</command>:</para>
174
175<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
176
177 <para>Create the <filename>/lib/systemd/systemd-user-sessions</filename>
178 script to allow unprivileged user logins without
179 <application>systemd-logind</application>:</para>
180
181<screen><userinput remap="adjust">cat &gt; /lib/systemd/systemd-user-sessions &lt;&lt; "EOF"
182#!/bin/bash
183rm -f /run/nologin
184EOF
185chmod 755 /lib/systemd/systemd-user-sessions</userinput></screen>
186
187 </sect2>
188
189 <sect2 id="contents-systemd" role="content">
190 <title>Contents of systemd</title>
191
192 <segmentedlist>
193 <segtitle>Installed programs</segtitle>
194 <segtitle>Installed libraries</segtitle>
195 <segtitle>Installed directories</segtitle>
196
197 <seglistitem>
198 <seg>bootctl, busctl, coredumpctl, halt, hostnamectl, init, journalctl,
199 kernel-install, localectl, loginctl, machinectl, networkctl, poweroff,
200 reboot, runlevel, shutdown, systemctl, systemd-analyze,
201 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
202 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
203 systemd-inhibit, systemd-machine-id-setup, systemd-mount,
204 systemd-notify, systemd-nspawn, systemd-path, systemd-resolve,
205 systemd-run, systemd-socket-activate,
206 systemd-stdio-bridge, systemd-tmpfiles, systemd-tty-ask-password-agent,
207 telinit, timedatectl, and udevadm</seg>
208 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
209 libnss_resolve.so.2, libnss_systemd.so.2,
210 libsystemd.so, libsystemd-shared-231.so,
211 and libudev.so</seg>
212 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
213 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
214 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
215 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
216 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
217 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
218 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
219 </seglistitem>
220 </segmentedlist>
221
222 <variablelist>
223 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
224 <?dbfo list-presentation="list"?>
225 <?dbhtml list-presentation="table"?>
226
227 <varlistentry id="bootctl">
228 <term><command>bootctl</command></term>
229 <listitem>
230 <para>used to query the firmware and boot manager settings</para>
231 <indexterm zone="ch-system-systemd bootctl">
232 <primary sortas="b-bootctl">bootctl</primary>
233 </indexterm>
234 </listitem>
235 </varlistentry>
236
237 <varlistentry id="busctl">
238 <term><command>busctl</command></term>
239 <listitem>
240 <para>Used to introspect and monitor the D-Bus bus</para>
241 <indexterm zone="ch-system-systemd busctl">
242 <primary sortas="b-busctl">busctl</primary>
243 </indexterm>
244 </listitem>
245 </varlistentry>
246
247 <varlistentry id="coredumpctl">
248 <term><command>coredumpctl</command></term>
249 <listitem>
250 <para>Used to retrieve coredumps from the systemd Journal</para>
251 <indexterm zone="ch-system-systemd coredumpctl">
252 <primary sortas="b-coredumpctl">coredumpctl</primary>
253 </indexterm>
254 </listitem>
255 </varlistentry>
256
257 <varlistentry id="halt">
258 <term><command>halt</command></term>
259 <listitem>
260 <para>Normally invokes <command>shutdown</command> with the
261 <parameter>-h</parameter> option, except when already in run-level 0,
262 then it tells the kernel to halt the system; it notes in the
263 file <filename>/var/log/wtmp</filename> that the system is being
264 brought down</para>
265 <indexterm zone="ch-system-systemd halt">
266 <primary sortas="b-halt">halt</primary>
267 </indexterm>
268 </listitem>
269 </varlistentry>
270
271 <varlistentry id="hostnamectl">
272 <term><command>hostnamectl</command></term>
273 <listitem>
274 <para>Used to query and change the system hostname and related
275 settings</para>
276 <indexterm zone="ch-system-systemd hostnamectl">
277 <primary sortas="b-hostnamectl">hostnamectl</primary>
278 </indexterm>
279 </listitem>
280 </varlistentry>
281
282 <varlistentry id="init">
283 <term><command>init</command></term>
284 <listitem>
285 <para>The first process to be started when the kernel has initialized
286 the hardware which takes over the boot process and starts all the
287 proceses it is instructed to</para>
288 <indexterm zone="ch-system-systemd init">
289 <primary sortas="b-init">init</primary>
290 </indexterm>
291 </listitem>
292 </varlistentry>
293
294 <varlistentry id="journalctl">
295 <term><command>journalctl</command></term>
296 <listitem>
297 <para>Used to query the contents of the systemd Journal</para>
298 <indexterm zone="ch-system-systemd journalctl">
299 <primary sortas="b-journalctl">journalctl</primary>
300 </indexterm>
301 </listitem>
302 </varlistentry>
303
304 <varlistentry id="kernel-install">
305 <term><command>kernel-install</command></term>
306 <listitem>
307 <para>Used to add and remove kernel and initramfs images to and
308 from /boot</para>
309 <indexterm zone="ch-system-systemd kernel-install">
310 <primary sortas="b-kernel-install">kernel-install</primary>
311 </indexterm>
312 </listitem>
313 </varlistentry>
314
315 <varlistentry id="localectl">
316 <term><command>localectl</command></term>
317 <listitem>
318 <para>Used to query and change the system locale and keyboard layout
319 settings</para>
320 <indexterm zone="ch-system-systemd localectl">
321 <primary sortas="b-localectl">localectl</primary>
322 </indexterm>
323 </listitem>
324 </varlistentry>
325
326 <varlistentry id="loginctl">
327 <term><command>loginctl</command></term>
328 <listitem>
329 <para>Used to introspect and control the state of the systemd Login
330 Manager</para>
331 <indexterm zone="ch-system-systemd loginctl">
332 <primary sortas="b-loginctl">loginctl</primary>
333 </indexterm>
334 </listitem>
335 </varlistentry>
336
337 <varlistentry id="machinectl">
338 <term><command>machinectl</command></term>
339 <listitem>
340 <para>Used to introspect and control the state of the systemd Virtual
341 Machine and Container Registration Manager</para>
342 <indexterm zone="ch-system-systemd machinectl">
343 <primary sortas="b-machinectl">machinectl</primary>
344 </indexterm>
345 </listitem>
346 </varlistentry>
347
348 <varlistentry id="networkctl">
349 <term><command>networkctl</command></term>
350 <listitem>
351 <para>Used to introspect the state of the network links as seen by
352 systemd-networkd</para>
353 <indexterm zone="ch-system-systemd networkctl">
354 <primary sortas="b-networkctl">networkctl</primary>
355 </indexterm>
356 </listitem>
357 </varlistentry>
358
359 <varlistentry id="poweroff">
360 <term><command>poweroff</command></term>
361 <listitem>
362 <para>Tells the kernel to halt the system and switch off the computer
363 (see <command>halt</command>)</para>
364 <indexterm zone="ch-system-systemd poweroff">
365 <primary sortas="b-poweroff">poweroff</primary>
366 </indexterm>
367 </listitem>
368 </varlistentry>
369
370 <varlistentry id="reboot">
371 <term><command>reboot</command></term>
372 <listitem>
373 <para>Tells the kernel to reboot the system (see
374 <command>halt</command>)</para>
375 <indexterm zone="ch-system-systemd reboot">
376 <primary sortas="b-reboot">reboot</primary>
377 </indexterm>
378 </listitem>
379 </varlistentry>
380
381 <varlistentry id="runlevel">
382 <term><command>runlevel</command></term>
383 <listitem>
384 <para>Reports the previous and the current run-level, as noted in the
385 last run-level record in <filename>/var/run/utmp</filename></para>
386 <indexterm zone="ch-system-systemd runlevel">
387 <primary sortas="b-runlevel">runlevel</primary>
388 </indexterm>
389 </listitem>
390 </varlistentry>
391
392 <varlistentry id="shutdown">
393 <term><command>shutdown</command></term>
394 <listitem>
395 <para>Brings the system down in a secure way, signaling all processes
396 and notifying all logged-in users</para>
397 <indexterm zone="ch-system-systemd shutdown">
398 <primary sortas="b-shutdown">shutdown</primary>
399 </indexterm>
400 </listitem>
401 </varlistentry>
402
403 <varlistentry id="systemctl">
404 <term><command>systemctl</command></term>
405 <listitem>
406 <para>Used to introspect and control the state of the systemd system
407 and service manager</para>
408 <indexterm zone="ch-system-systemd systemctl">
409 <primary sortas="b-systemctl">systemctl</primary>
410 </indexterm>
411 </listitem>
412 </varlistentry>
413
414 <varlistentry id="systemd-analyze">
415 <term><command>systemd-analyze</command></term>
416 <listitem>
417 <para>Used to determine system boot-up performance of the current
418 boot</para>
419 <indexterm zone="ch-system-systemd systemd-analyze">
420 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
421 </indexterm>
422 </listitem>
423 </varlistentry>
424
425 <varlistentry id="systemd-ask-password">
426 <term><command>systemd-ask-password</command></term>
427 <listitem>
428 <para>Used to query a system password or passphrase from the user,
429 using a question message specified on the command line</para>
430 <indexterm zone="ch-system-systemd systemd-ask-password">
431 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
432 </indexterm>
433 </listitem>
434 </varlistentry>
435
436 <varlistentry id="systemd-cat">
437 <term><command>systemd-cat</command></term>
438 <listitem>
439 <para>Used to connect STDOUT and STDERR of a process with the Journal
440 </para>
441 <indexterm zone="ch-system-systemd systemd-cat">
442 <primary sortas="b-systemd-cat">systemd-cat</primary>
443 </indexterm>
444 </listitem>
445 </varlistentry>
446
447 <varlistentry id="systemd-cgls">
448 <term><command>systemd-cgls</command></term>
449 <listitem>
450 <para>Recursively shows the contents of the selected Linux control
451 group hierarchy in a tree</para>
452 <indexterm zone="ch-system-systemd systemd-cgls">
453 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
454 </indexterm>
455 </listitem>
456 </varlistentry>
457
458 <varlistentry id="systemd-cgtop">
459 <term><command>systemd-cgtop</command></term>
460 <listitem>
461 <para>Shows the top control groups of the local Linux control group
462 hierarchy, ordered by their CPU, memory and disk I/O load</para>
463 <indexterm zone="ch-system-systemd systemd-cgtop">
464 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
465 </indexterm>
466 </listitem>
467 </varlistentry>
468
469 <varlistentry id="systemd-delta">
470 <term><command>systemd-delta</command></term>
471 <listitem>
472 <para>Used to identify and compare configuration files in
473 <filename class="directory">/etc</filename> that override default
474 counterparts in <filename class="directory">/usr</filename></para>
475 <indexterm zone="ch-system-systemd systemd-delta">
476 <primary sortas="b-systemd-delta">systemd-delta</primary>
477 </indexterm>
478 </listitem>
479 </varlistentry>
480
481 <varlistentry id="systemd-detect-virt">
482 <term><command>systemd-detect-virt</command></term>
483 <listitem>
484 <para>Detects execution in a virtualized environment</para>
485 <indexterm zone="ch-system-systemd systemd-detect-virt">
486 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
487 </indexterm>
488 </listitem>
489 </varlistentry>
490
491 <varlistentry id="systemd-escape">
492 <term><command>systemd-escape</command></term>
493 <listitem>
494 <para>Used to escape strings for inclusion in systemd unit
495 names</para>
496 <indexterm zone="ch-system-systemd systemd-escape">
497 <primary sortas="b-systemd-escape">systemd-escape</primary>
498 </indexterm>
499 </listitem>
500 </varlistentry>
501
502 <varlistentry id="systemd-hwdb">
503 <term><command>systemd-hwdb</command></term>
504 <listitem>
505 <para>Used to manage hardware database (hwdb)</para>
506 <indexterm zone="ch-system-systemd systemd-hwdb">
507 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
508 </indexterm>
509 </listitem>
510 </varlistentry>
511
512 <varlistentry id="systemd-inhibit">
513 <term><command>systemd-inhibit</command></term>
514 <listitem>
515 <para>Used to execute a program with a shutdown, sleep or idle
516 inhibitor lock taken</para>
517 <indexterm zone="ch-system-systemd systemd-inhibit">
518 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
519 </indexterm>
520 </listitem>
521 </varlistentry>
522
523 <varlistentry id="systemd-machine-id-setup">
524 <term><command>systemd-machine-id-setup</command></term>
525 <listitem>
526 <para>Used by system installer tools to initialize the machine ID
527 stored in <filename>/etc/machine-id</filename> at install time with a
528 randomly generated ID</para>
529 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
530 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
531 </indexterm>
532 </listitem>
533 </varlistentry>
534
535 <varlistentry id="systemd-mount">
536 <term><command>systemd-mount</command></term>
537 <listitem>
538 <para>is a tool to temporarily mount or auto-mount a drive.</para>
539 <indexterm zone="ch-system-systemd systemd-mount">
540 <primary sortas="b-systemd-mount">systemd-mount</primary>
541 </indexterm>
542 </listitem>
543 </varlistentry>
544
545 <varlistentry id="systemd-notify">
546 <term><command>systemd-notify</command></term>
547 <listitem>
548 <para>Used by daemon scripts to notify the init system about status
549 changes</para>
550 <indexterm zone="ch-system-systemd systemd-notify">
551 <primary sortas="b-systemd-notify">systemd-notify</primary>
552 </indexterm>
553 </listitem>
554 </varlistentry>
555
556 <varlistentry id="systemd-nspawn">
557 <term><command>systemd-nspawn</command></term>
558 <listitem>
559 <para>Used to run a command or OS in a light-weight namespace
560 container</para>
561 <indexterm zone="ch-system-systemd systemd-nspawn">
562 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
563 </indexterm>
564 </listitem>
565 </varlistentry>
566
567 <varlistentry id="systemd-path">
568 <term><command>systemd-path</command></term>
569 <listitem>
570 <para>Used to query system and user paths</para>
571 <indexterm zone="ch-system-systemd systemd-path">
572 <primary sortas="b-systemd-path">systemd-path</primary>
573 </indexterm>
574 </listitem>
575 </varlistentry>
576
577 <varlistentry id="systemd-resolve">
578 <term><command>systemd-resolve</command></term>
579 <listitem>
580 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
581 resource records, and services</para>
582 <indexterm zone="ch-system-systemd systemd-resolve">
583 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
584 </indexterm>
585 </listitem>
586 </varlistentry>
587
588 <varlistentry id="systemd-run">
589 <term><command>systemd-run</command></term>
590 <listitem>
591 <para>Used to create and start a transient .service or a .scope unit
592 and run the specified command in it</para>
593 <indexterm zone="ch-system-systemd systemd-run">
594 <primary sortas="b-systemd-run">systemd-run</primary>
595 </indexterm>
596 </listitem>
597 </varlistentry>
598
599 <!-- <varlistentry id="systemd-stdio-bridge">
600 <term><command>systemd-stdio-bridge</command></term>
601 <listitem>
602 <para>To be completed</para>
603 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
604 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
605 </indexterm>
606 </listitem>
607 </varlistentry> -->
608
609 <varlistentry id="systemd-socket-activate">
610 <term><command>systemd-socket-activate</command></term>
611 <listitem>
612 <para>is a tool to listen on socket devices and launch a process upon
613 connection.</para>
614 <indexterm zone="ch-system-systemd systemd-socket-activate">
615 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
616 </indexterm>
617 </listitem>
618 </varlistentry>
619
620 <varlistentry id="systemd-tmpfiles">
621 <term><command>systemd-tmpfiles</command></term>
622 <listitem>
623 <para>Creates, deletes and cleans up volatile and temporary files and
624 directories, based on the configuration file format and location
625 specified in
626 <filename class="directory">tmpfiles.d</filename> directories</para>
627 <indexterm zone="ch-system-systemd systemd-tmpfiles">
628 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
629 </indexterm>
630 </listitem>
631 </varlistentry>
632
633 <varlistentry id="systemd-tty-ask-password-agent">
634 <term><command>systemd-tty-ask-password-agent</command></term>
635 <listitem>
636 <para>Used to list or process pending systemd password requests</para>
637 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
638 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
639 </indexterm>
640 </listitem>
641 </varlistentry>
642
643 <varlistentry id="telinit">
644 <term><command>telinit</command></term>
645 <listitem>
646 <para>Tells <command>init</command> which run-level to change
647 to</para>
648 <indexterm zone="ch-system-systemd telinit">
649 <primary sortas="b-telinit">telinit</primary>
650 </indexterm>
651 </listitem>
652 </varlistentry>
653
654 <varlistentry id="timedatectl">
655 <term><command>timedatectl</command></term>
656 <listitem>
657 <para>Used to query and change the system clock and its settings
658 </para>
659 <indexterm zone="ch-system-systemd timedatectl">
660 <primary sortas="b-timedatectl">timedatectl</primary>
661 </indexterm>
662 </listitem>
663 </varlistentry>
664
665 <varlistentry id="udevadm">
666 <term><command>udevadm</command></term>
667 <listitem>
668 <para>Generic Udev administration tool: controls the udevd daemon,
669 provides info from the Udev database, monitors uevents, waits for
670 uevents to finish, tests Udev configuration, and triggers uevents
671 for a given device</para>
672 <indexterm zone="ch-system-systemd udevadm">
673 <primary sortas="b-udevadm">udevadm</primary>
674 </indexterm>
675 </listitem>
676 </varlistentry>
677
678 <varlistentry id="libsystemd">
679 <term><filename class="libraryfile">libsystemd</filename></term>
680 <listitem>
681 <para>systemd utility library</para>
682 <indexterm zone="ch-system-systemd libsystemd">
683 <primary sortas="c-libsystemd">libsystemd</primary>
684 </indexterm>
685 </listitem>
686 </varlistentry>
687
688 <varlistentry id="libudev">
689 <term><filename class="libraryfile">libudev</filename></term>
690 <listitem>
691 <para>A library to access Udev device information</para>
692 <indexterm zone="ch-system-systemd libudev">
693 <primary sortas="c-libudev">libudev</primary>
694 </indexterm>
695 </listitem>
696 </varlistentry>
697
698 </variablelist>
699
700 </sect2>
701
702</sect1>
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