source: chapter06/systemd.xml@ ea5492c

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Last change on this file since ea5492c was ea5492c, checked in by DJ Lucas <dj@…>, 6 years ago

Fix systemd-236 md5sum.

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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 -sf /tools/bin/true /usr/bin/xsltproc</userinput></screen>
46 <para>Set up the man pages:</para>
47
48<screen><userinput remap="pre">tar -xf ../systemd-man-pages-&systemd-version;.tar.xz</userinput></screen>
49
50 <para>Prepare systemd for compilation:</para>
51
52 <screen><userinput remap="configure">mkdir -p build
53cd build
54
55LANG=en_US.UTF-8 \
56meson --prefix=/usr \
57 --sysconfdir=/etc \
58 --localstatedir=/var \
59 -Dblkid=true \
60 -Dbuildtype=release \
61 -Ddefault-dnssec=no \
62 -Dfirstboot=false \
63 -Dkill-path=/bin/kill \
64 -Dkmod-path=/bin/kmod \
65 -Dldconfig=false \
66 -Dmount-path=/bin/mount \
67 -Drootprefix= \
68 -Drootlibdir=/lib \
69 -Dsplit-usr=true \
70 -Dsulogin-path=/sbin/sulogin \
71 -Dsysusers=false \
72 -Dumount-path=/bin/umount \
73 -Db_lto=false \
74 ..</userinput></screen>
75
76 <variablelist>
77 <title>The meaning of the meson options:</title>
78
79 <varlistentry>
80 <term><parameter>-D*-path=*</parameter></term>
81 <listitem>
82 <para>These switches provide location of binaries needed by
83 systemd at runtime that have not yet been installed, or who's
84 pkgconfig files are currently only in
85 <filename>/tools/lib/pkgconfig</filename>.</para>
86 </listitem>
87 </varlistentry>
88
89 <varlistentry>
90 <term><parameter>-Ddefault-dnssec=no</parameter></term>
91 <listitem>
92 <para>This switch turns off the experimental DNSSEC support.</para>
93 </listitem>
94 </varlistentry>
95
96 <varlistentry>
97 <term><parameter>-Dfirstboot=false</parameter></term>
98 <listitem>
99 <para>This switch prevents installation of systemd
100 services responsible for setting up the system for
101 the first time. They are not useful for LFS because
102 everything is done manually.</para>
103 </listitem>
104 </varlistentry>
105
106 <varlistentry>
107 <term><parameter>-Dldconfig=no</parameter></term>
108 <listitem>
109 <para>This switch prevents installation of a systemd
110 unit that runs <command>ldconfig</command> at
111 boot, making the boot time longer. Remove it if the
112 described feature is desired, even though it's not
113 useful for source distributions such as LFS.</para>
114 </listitem>
115 </varlistentry>
116
117 <varlistentry>
118 <term><parameter>-Droot*</parameter></term>
119 <listitem>
120 <para>These switches ensure that core programs and
121 shared libraries are installed in the subdirectories
122 of the root partition.</para>
123 </listitem>
124 </varlistentry>
125
126 <varlistentry>
127 <term><parameter>-Dsplit-usr=true</parameter></term>
128 <listitem>
129 <para>This switch ensures that systemd will work on
130 systems where /bin, /lib and /sbin directories are not
131 symlinks to their /usr counterparts.</para>
132 </listitem>
133 </varlistentry>
134
135 <varlistentry>
136 <term><parameter>-Dsysusers=false</parameter></term>
137 <listitem>
138 <para>This switch prevents installation of systemd
139 services responsible for setting up the
140 <filename>/etc/group</filename> and
141 <filename>/etc/passwd</filename> files. Both files
142 were created early in this chapter.</para>
143 </listitem>
144 </varlistentry>
145
146 </variablelist>
147
148 <para>Compile the package:</para>
149
150<screen><userinput remap="make">LANG=en_US.UTF-8 ninja</userinput></screen>
151<!--
152 <para>To test the package, execute the following command:</para>
153
154<screen><userinput remap="test">LANG=en_US.UTF-8 ninja test</userinput></screen>
155-->
156 <para>Install the package:</para>
157
158<screen><userinput remap="install">LANG=en_US.UTF-8 ninja install</userinput></screen>
159
160 <para>Remove an unnecessary directory:</para>
161
162<screen><userinput remap="install">rm -rfv /usr/lib/rpm</userinput></screen>
163
164 <para>Create the Sysvinit compatibility symlinks, so systemd is used
165 as the default init system:</para>
166
167<screen><userinput remap="install">for tool in runlevel reboot shutdown poweroff halt telinit; do
168 ln -sfv ../bin/systemctl /sbin/${tool}
169done
170ln -sfv ../lib/systemd/systemd /sbin/init</userinput></screen>
171
172 <para>Remove our earlier created symlink for xsltproc:</para>
173
174<screen><userinput remap="install">rm -f /usr/bin/xsltproc</userinput></screen>
175
176 <para>Create the <filename>/etc/machine-id</filename> file needed by
177 <command>systemd-journald</command>:</para>
178
179<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
180
181 <para>Create the <filename>/lib/systemd/systemd-user-sessions</filename>
182 script to allow unprivileged user logins without
183 <application>systemd-logind</application>:</para>
184
185<screen><userinput remap="adjust">cat &gt; /lib/systemd/systemd-user-sessions &lt;&lt; "EOF"
186#!/bin/bash
187rm -f /run/nologin
188EOF
189chmod 755 /lib/systemd/systemd-user-sessions</userinput></screen>
190
191 </sect2>
192
193 <sect2 id="contents-systemd" role="content">
194 <title>Contents of systemd</title>
195
196 <segmentedlist>
197 <segtitle>Installed programs</segtitle>
198 <segtitle>Installed libraries</segtitle>
199 <segtitle>Installed directories</segtitle>
200
201 <seglistitem>
202 <seg>bootctl, busctl, coredumpctl, halt, hostnamectl, init, journalctl,
203 kernel-install, localectl, loginctl, machinectl, networkctl, poweroff,
204 reboot, runlevel, shutdown, systemctl, systemd-analyze,
205 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
206 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
207 systemd-inhibit, systemd-machine-id-setup, systemd-mount,
208 systemd-notify, systemd-nspawn, systemd-path, systemd-resolve,
209 systemd-run, systemd-socket-activate,
210 systemd-stdio-bridge, systemd-tmpfiles, systemd-tty-ask-password-agent,
211 telinit, timedatectl, and udevadm</seg>
212 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
213 libnss_resolve.so.2, libnss_systemd.so.2,
214 libsystemd.so, libsystemd-shared-231.so,
215 and libudev.so</seg>
216 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
217 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
218 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
219 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
220 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
221 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
222 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
223 </seglistitem>
224 </segmentedlist>
225
226 <variablelist>
227 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
228 <?dbfo list-presentation="list"?>
229 <?dbhtml list-presentation="table"?>
230
231 <varlistentry id="bootctl">
232 <term><command>bootctl</command></term>
233 <listitem>
234 <para>used to query the firmware and boot manager settings</para>
235 <indexterm zone="ch-system-systemd bootctl">
236 <primary sortas="b-bootctl">bootctl</primary>
237 </indexterm>
238 </listitem>
239 </varlistentry>
240
241 <varlistentry id="busctl">
242 <term><command>busctl</command></term>
243 <listitem>
244 <para>Used to introspect and monitor the D-Bus bus</para>
245 <indexterm zone="ch-system-systemd busctl">
246 <primary sortas="b-busctl">busctl</primary>
247 </indexterm>
248 </listitem>
249 </varlistentry>
250
251 <varlistentry id="coredumpctl">
252 <term><command>coredumpctl</command></term>
253 <listitem>
254 <para>Used to retrieve coredumps from the systemd Journal</para>
255 <indexterm zone="ch-system-systemd coredumpctl">
256 <primary sortas="b-coredumpctl">coredumpctl</primary>
257 </indexterm>
258 </listitem>
259 </varlistentry>
260
261 <varlistentry id="halt">
262 <term><command>halt</command></term>
263 <listitem>
264 <para>Normally invokes <command>shutdown</command> with the
265 <parameter>-h</parameter> option, except when already in run-level 0,
266 then it tells the kernel to halt the system; it notes in the
267 file <filename>/var/log/wtmp</filename> that the system is being
268 brought down</para>
269 <indexterm zone="ch-system-systemd halt">
270 <primary sortas="b-halt">halt</primary>
271 </indexterm>
272 </listitem>
273 </varlistentry>
274
275 <varlistentry id="hostnamectl">
276 <term><command>hostnamectl</command></term>
277 <listitem>
278 <para>Used to query and change the system hostname and related
279 settings</para>
280 <indexterm zone="ch-system-systemd hostnamectl">
281 <primary sortas="b-hostnamectl">hostnamectl</primary>
282 </indexterm>
283 </listitem>
284 </varlistentry>
285
286 <varlistentry id="init">
287 <term><command>init</command></term>
288 <listitem>
289 <para>The first process to be started when the kernel has initialized
290 the hardware which takes over the boot process and starts all the
291 proceses it is instructed to</para>
292 <indexterm zone="ch-system-systemd init">
293 <primary sortas="b-init">init</primary>
294 </indexterm>
295 </listitem>
296 </varlistentry>
297
298 <varlistentry id="journalctl">
299 <term><command>journalctl</command></term>
300 <listitem>
301 <para>Used to query the contents of the systemd Journal</para>
302 <indexterm zone="ch-system-systemd journalctl">
303 <primary sortas="b-journalctl">journalctl</primary>
304 </indexterm>
305 </listitem>
306 </varlistentry>
307
308 <varlistentry id="kernel-install">
309 <term><command>kernel-install</command></term>
310 <listitem>
311 <para>Used to add and remove kernel and initramfs images to and
312 from /boot</para>
313 <indexterm zone="ch-system-systemd kernel-install">
314 <primary sortas="b-kernel-install">kernel-install</primary>
315 </indexterm>
316 </listitem>
317 </varlistentry>
318
319 <varlistentry id="localectl">
320 <term><command>localectl</command></term>
321 <listitem>
322 <para>Used to query and change the system locale and keyboard layout
323 settings</para>
324 <indexterm zone="ch-system-systemd localectl">
325 <primary sortas="b-localectl">localectl</primary>
326 </indexterm>
327 </listitem>
328 </varlistentry>
329
330 <varlistentry id="loginctl">
331 <term><command>loginctl</command></term>
332 <listitem>
333 <para>Used to introspect and control the state of the systemd Login
334 Manager</para>
335 <indexterm zone="ch-system-systemd loginctl">
336 <primary sortas="b-loginctl">loginctl</primary>
337 </indexterm>
338 </listitem>
339 </varlistentry>
340
341 <varlistentry id="machinectl">
342 <term><command>machinectl</command></term>
343 <listitem>
344 <para>Used to introspect and control the state of the systemd Virtual
345 Machine and Container Registration Manager</para>
346 <indexterm zone="ch-system-systemd machinectl">
347 <primary sortas="b-machinectl">machinectl</primary>
348 </indexterm>
349 </listitem>
350 </varlistentry>
351
352 <varlistentry id="networkctl">
353 <term><command>networkctl</command></term>
354 <listitem>
355 <para>Used to introspect the state of the network links as seen by
356 systemd-networkd</para>
357 <indexterm zone="ch-system-systemd networkctl">
358 <primary sortas="b-networkctl">networkctl</primary>
359 </indexterm>
360 </listitem>
361 </varlistentry>
362
363 <varlistentry id="poweroff">
364 <term><command>poweroff</command></term>
365 <listitem>
366 <para>Tells the kernel to halt the system and switch off the computer
367 (see <command>halt</command>)</para>
368 <indexterm zone="ch-system-systemd poweroff">
369 <primary sortas="b-poweroff">poweroff</primary>
370 </indexterm>
371 </listitem>
372 </varlistentry>
373
374 <varlistentry id="reboot">
375 <term><command>reboot</command></term>
376 <listitem>
377 <para>Tells the kernel to reboot the system (see
378 <command>halt</command>)</para>
379 <indexterm zone="ch-system-systemd reboot">
380 <primary sortas="b-reboot">reboot</primary>
381 </indexterm>
382 </listitem>
383 </varlistentry>
384
385 <varlistentry id="runlevel">
386 <term><command>runlevel</command></term>
387 <listitem>
388 <para>Reports the previous and the current run-level, as noted in the
389 last run-level record in <filename>/var/run/utmp</filename></para>
390 <indexterm zone="ch-system-systemd runlevel">
391 <primary sortas="b-runlevel">runlevel</primary>
392 </indexterm>
393 </listitem>
394 </varlistentry>
395
396 <varlistentry id="shutdown">
397 <term><command>shutdown</command></term>
398 <listitem>
399 <para>Brings the system down in a secure way, signaling all processes
400 and notifying all logged-in users</para>
401 <indexterm zone="ch-system-systemd shutdown">
402 <primary sortas="b-shutdown">shutdown</primary>
403 </indexterm>
404 </listitem>
405 </varlistentry>
406
407 <varlistentry id="systemctl">
408 <term><command>systemctl</command></term>
409 <listitem>
410 <para>Used to introspect and control the state of the systemd system
411 and service manager</para>
412 <indexterm zone="ch-system-systemd systemctl">
413 <primary sortas="b-systemctl">systemctl</primary>
414 </indexterm>
415 </listitem>
416 </varlistentry>
417
418 <varlistentry id="systemd-analyze">
419 <term><command>systemd-analyze</command></term>
420 <listitem>
421 <para>Used to determine system boot-up performance of the current
422 boot</para>
423 <indexterm zone="ch-system-systemd systemd-analyze">
424 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
425 </indexterm>
426 </listitem>
427 </varlistentry>
428
429 <varlistentry id="systemd-ask-password">
430 <term><command>systemd-ask-password</command></term>
431 <listitem>
432 <para>Used to query a system password or passphrase from the user,
433 using a question message specified on the command line</para>
434 <indexterm zone="ch-system-systemd systemd-ask-password">
435 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
436 </indexterm>
437 </listitem>
438 </varlistentry>
439
440 <varlistentry id="systemd-cat">
441 <term><command>systemd-cat</command></term>
442 <listitem>
443 <para>Used to connect STDOUT and STDERR of a process with the Journal
444 </para>
445 <indexterm zone="ch-system-systemd systemd-cat">
446 <primary sortas="b-systemd-cat">systemd-cat</primary>
447 </indexterm>
448 </listitem>
449 </varlistentry>
450
451 <varlistentry id="systemd-cgls">
452 <term><command>systemd-cgls</command></term>
453 <listitem>
454 <para>Recursively shows the contents of the selected Linux control
455 group hierarchy in a tree</para>
456 <indexterm zone="ch-system-systemd systemd-cgls">
457 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
458 </indexterm>
459 </listitem>
460 </varlistentry>
461
462 <varlistentry id="systemd-cgtop">
463 <term><command>systemd-cgtop</command></term>
464 <listitem>
465 <para>Shows the top control groups of the local Linux control group
466 hierarchy, ordered by their CPU, memory and disk I/O load</para>
467 <indexterm zone="ch-system-systemd systemd-cgtop">
468 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
469 </indexterm>
470 </listitem>
471 </varlistentry>
472
473 <varlistentry id="systemd-delta">
474 <term><command>systemd-delta</command></term>
475 <listitem>
476 <para>Used to identify and compare configuration files in
477 <filename class="directory">/etc</filename> that override default
478 counterparts in <filename class="directory">/usr</filename></para>
479 <indexterm zone="ch-system-systemd systemd-delta">
480 <primary sortas="b-systemd-delta">systemd-delta</primary>
481 </indexterm>
482 </listitem>
483 </varlistentry>
484
485 <varlistentry id="systemd-detect-virt">
486 <term><command>systemd-detect-virt</command></term>
487 <listitem>
488 <para>Detects execution in a virtualized environment</para>
489 <indexterm zone="ch-system-systemd systemd-detect-virt">
490 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
491 </indexterm>
492 </listitem>
493 </varlistentry>
494
495 <varlistentry id="systemd-escape">
496 <term><command>systemd-escape</command></term>
497 <listitem>
498 <para>Used to escape strings for inclusion in systemd unit
499 names</para>
500 <indexterm zone="ch-system-systemd systemd-escape">
501 <primary sortas="b-systemd-escape">systemd-escape</primary>
502 </indexterm>
503 </listitem>
504 </varlistentry>
505
506 <varlistentry id="systemd-hwdb">
507 <term><command>systemd-hwdb</command></term>
508 <listitem>
509 <para>Used to manage hardware database (hwdb)</para>
510 <indexterm zone="ch-system-systemd systemd-hwdb">
511 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
512 </indexterm>
513 </listitem>
514 </varlistentry>
515
516 <varlistentry id="systemd-inhibit">
517 <term><command>systemd-inhibit</command></term>
518 <listitem>
519 <para>Used to execute a program with a shutdown, sleep or idle
520 inhibitor lock taken</para>
521 <indexterm zone="ch-system-systemd systemd-inhibit">
522 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
523 </indexterm>
524 </listitem>
525 </varlistentry>
526
527 <varlistentry id="systemd-machine-id-setup">
528 <term><command>systemd-machine-id-setup</command></term>
529 <listitem>
530 <para>Used by system installer tools to initialize the machine ID
531 stored in <filename>/etc/machine-id</filename> at install time with a
532 randomly generated ID</para>
533 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
534 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
535 </indexterm>
536 </listitem>
537 </varlistentry>
538
539 <varlistentry id="systemd-mount">
540 <term><command>systemd-mount</command></term>
541 <listitem>
542 <para>is a tool to temporarily mount or auto-mount a drive.</para>
543 <indexterm zone="ch-system-systemd systemd-mount">
544 <primary sortas="b-systemd-mount">systemd-mount</primary>
545 </indexterm>
546 </listitem>
547 </varlistentry>
548
549 <varlistentry id="systemd-notify">
550 <term><command>systemd-notify</command></term>
551 <listitem>
552 <para>Used by daemon scripts to notify the init system about status
553 changes</para>
554 <indexterm zone="ch-system-systemd systemd-notify">
555 <primary sortas="b-systemd-notify">systemd-notify</primary>
556 </indexterm>
557 </listitem>
558 </varlistentry>
559
560 <varlistentry id="systemd-nspawn">
561 <term><command>systemd-nspawn</command></term>
562 <listitem>
563 <para>Used to run a command or OS in a light-weight namespace
564 container</para>
565 <indexterm zone="ch-system-systemd systemd-nspawn">
566 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
567 </indexterm>
568 </listitem>
569 </varlistentry>
570
571 <varlistentry id="systemd-path">
572 <term><command>systemd-path</command></term>
573 <listitem>
574 <para>Used to query system and user paths</para>
575 <indexterm zone="ch-system-systemd systemd-path">
576 <primary sortas="b-systemd-path">systemd-path</primary>
577 </indexterm>
578 </listitem>
579 </varlistentry>
580
581 <varlistentry id="systemd-resolve">
582 <term><command>systemd-resolve</command></term>
583 <listitem>
584 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
585 resource records, and services</para>
586 <indexterm zone="ch-system-systemd systemd-resolve">
587 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
588 </indexterm>
589 </listitem>
590 </varlistentry>
591
592 <varlistentry id="systemd-run">
593 <term><command>systemd-run</command></term>
594 <listitem>
595 <para>Used to create and start a transient .service or a .scope unit
596 and run the specified command in it</para>
597 <indexterm zone="ch-system-systemd systemd-run">
598 <primary sortas="b-systemd-run">systemd-run</primary>
599 </indexterm>
600 </listitem>
601 </varlistentry>
602
603 <!-- <varlistentry id="systemd-stdio-bridge">
604 <term><command>systemd-stdio-bridge</command></term>
605 <listitem>
606 <para>To be completed</para>
607 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
608 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
609 </indexterm>
610 </listitem>
611 </varlistentry> -->
612
613 <varlistentry id="systemd-socket-activate">
614 <term><command>systemd-socket-activate</command></term>
615 <listitem>
616 <para>is a tool to listen on socket devices and launch a process upon
617 connection.</para>
618 <indexterm zone="ch-system-systemd systemd-socket-activate">
619 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
620 </indexterm>
621 </listitem>
622 </varlistentry>
623
624 <varlistentry id="systemd-tmpfiles">
625 <term><command>systemd-tmpfiles</command></term>
626 <listitem>
627 <para>Creates, deletes and cleans up volatile and temporary files and
628 directories, based on the configuration file format and location
629 specified in
630 <filename class="directory">tmpfiles.d</filename> directories</para>
631 <indexterm zone="ch-system-systemd systemd-tmpfiles">
632 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
633 </indexterm>
634 </listitem>
635 </varlistentry>
636
637 <varlistentry id="systemd-tty-ask-password-agent">
638 <term><command>systemd-tty-ask-password-agent</command></term>
639 <listitem>
640 <para>Used to list or process pending systemd password requests</para>
641 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
642 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
643 </indexterm>
644 </listitem>
645 </varlistentry>
646
647 <varlistentry id="telinit">
648 <term><command>telinit</command></term>
649 <listitem>
650 <para>Tells <command>init</command> which run-level to change
651 to</para>
652 <indexterm zone="ch-system-systemd telinit">
653 <primary sortas="b-telinit">telinit</primary>
654 </indexterm>
655 </listitem>
656 </varlistentry>
657
658 <varlistentry id="timedatectl">
659 <term><command>timedatectl</command></term>
660 <listitem>
661 <para>Used to query and change the system clock and its settings
662 </para>
663 <indexterm zone="ch-system-systemd timedatectl">
664 <primary sortas="b-timedatectl">timedatectl</primary>
665 </indexterm>
666 </listitem>
667 </varlistentry>
668
669 <varlistentry id="udevadm">
670 <term><command>udevadm</command></term>
671 <listitem>
672 <para>Generic Udev administration tool: controls the udevd daemon,
673 provides info from the Udev database, monitors uevents, waits for
674 uevents to finish, tests Udev configuration, and triggers uevents
675 for a given device</para>
676 <indexterm zone="ch-system-systemd udevadm">
677 <primary sortas="b-udevadm">udevadm</primary>
678 </indexterm>
679 </listitem>
680 </varlistentry>
681
682 <varlistentry id="libsystemd">
683 <term><filename class="libraryfile">libsystemd</filename></term>
684 <listitem>
685 <para>systemd utility library</para>
686 <indexterm zone="ch-system-systemd libsystemd">
687 <primary sortas="c-libsystemd">libsystemd</primary>
688 </indexterm>
689 </listitem>
690 </varlistentry>
691
692 <varlistentry id="libudev">
693 <term><filename class="libraryfile">libudev</filename></term>
694 <listitem>
695 <para>A library to access Udev device information</para>
696 <indexterm zone="ch-system-systemd libudev">
697 <primary sortas="c-libudev">libudev</primary>
698 </indexterm>
699 </listitem>
700 </varlistentry>
701
702 </variablelist>
703
704 </sect2>
705
706</sect1>
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