source: chapter06/systemd.xml@ 5323dbf

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Last change on this file since 5323dbf was 5323dbf, checked in by Douglas R. Reno <renodr@…>, 5 years ago

Update to systemd-241

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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>Apply a patch to fix two critical security vulnerabilities:</para>
44
45<screen><userinput remap="pre">patch -Np1 -i ../systemd-240-security_fixes-2.patch</userinput></screen>
46 -->
47
48 <para>Create a symlink to work around missing xsltproc:</para>
49
50<screen><userinput remap="pre">ln -sf /tools/bin/true /usr/bin/xsltproc</userinput></screen>
51
52 <para>Because we have not yet installed the final version of Util-Linux,
53 create links to the libraries in the approprite location:</para>
54
55<screen><userinput remap="pre">for file in /tools/lib/lib{blkid,mount,uuid}*; do
56 ln -sf $file /usr/lib/
57done</userinput></screen>
58
59 <para>Set up the man pages:</para>
60
61<screen><userinput remap="pre">tar -xf ../systemd-man-pages-&systemd-version;.tar.xz</userinput></screen>
62
63 <para>Remove tests that cannot be built in chroot:</para>
64
65<screen><userinput remap="pre">sed '177,$ d' -i src/resolve/meson.build</userinput></screen>
66
67 <para>Remove an unneeded group,
68 <systemitem class="groupname">render</systemitem>, from the default udev
69 rules:</para>
70
71<screen><userinput remap="pre">sed -i 's/GROUP="render", //' rules/50-udev-default.rules.in</userinput></screen>
72
73 <para>Prepare systemd for compilation:</para>
74
75 <screen><userinput remap="configure">mkdir -p build
76cd build
77
78PKG_CONFIG_PATH="/usr/lib/pkgconfig:/tools/lib/pkgconfig" \
79LANG=en_US.UTF-8 \
80meson --prefix=/usr \
81 --sysconfdir=/etc \
82 --localstatedir=/var \
83 -Dblkid=true \
84 -Dbuildtype=release \
85 -Ddefault-dnssec=no \
86 -Dfirstboot=false \
87 -Dinstall-tests=false \
88 -Dkill-path=/bin/kill \
89 -Dkmod-path=/bin/kmod \
90 -Dldconfig=false \
91 -Dmount-path=/bin/mount \
92 -Drootprefix= \
93 -Drootlibdir=/lib \
94 -Dsplit-usr=true \
95 -Dsulogin-path=/sbin/sulogin \
96 -Dsysusers=false \
97 -Dumount-path=/bin/umount \
98 -Db_lto=false \
99 ..</userinput></screen>
100
101 <variablelist>
102 <title>The meaning of the meson options:</title>
103
104 <varlistentry>
105 <term><parameter>-D*-path=*</parameter></term>
106 <listitem>
107 <para>These switches provide location of binaries needed by
108 systemd at runtime that have not yet been installed, or who's
109 pkgconfig files are currently only in
110 <filename>/tools/lib/pkgconfig</filename>.</para>
111 </listitem>
112 </varlistentry>
113
114 <varlistentry>
115 <term><parameter>-Ddefault-dnssec=no</parameter></term>
116 <listitem>
117 <para>This switch turns off the experimental DNSSEC support.</para>
118 </listitem>
119 </varlistentry>
120
121 <varlistentry>
122 <term><parameter>-Dfirstboot=false</parameter></term>
123 <listitem>
124 <para>This switch prevents installation of systemd
125 services responsible for setting up the system for
126 the first time. They are not useful for LFS because
127 everything is done manually.</para>
128 </listitem>
129 </varlistentry>
130
131 <varlistentry>
132 <term><parameter>-Dinstall-tests=false</parameter></term>
133 <listitem>
134 <para>This switch prevents installation of the compiled tests.</para>
135 </listitem>
136 </varlistentry>
137
138 <varlistentry>
139 <term><parameter>-Dldconfig=false</parameter></term>
140 <listitem>
141 <para>This switch prevents installation of a systemd unit that runs
142 <command>ldconfig</command> at boot, which is not useful for source
143 distributions such as LFS and makes the boot time longer. Remove it
144 if the described feature is desired.</para>
145 </listitem>
146 </varlistentry>
147
148 <varlistentry>
149 <term><parameter>-Droot*</parameter></term>
150 <listitem>
151 <para>These switches ensure that core programs and
152 shared libraries are installed in the subdirectories
153 of the root partition.</para>
154 </listitem>
155 </varlistentry>
156
157 <varlistentry>
158 <term><parameter>-Dsplit-usr=true</parameter></term>
159 <listitem>
160 <para>This switch ensures that systemd will work on
161 systems where /bin, /lib and /sbin directories are not
162 symlinks to their /usr counterparts.</para>
163 </listitem>
164 </varlistentry>
165
166 <varlistentry>
167 <term><parameter>-Dsysusers=false</parameter></term>
168 <listitem>
169 <para>This switch prevents installation of systemd
170 services responsible for setting up the
171 <filename>/etc/group</filename> and
172 <filename>/etc/passwd</filename> files. Both files
173 were created earlier in this chapter.</para>
174 </listitem>
175 </varlistentry>
176
177 </variablelist>
178
179 <para>Compile the package:</para>
180
181<screen><userinput remap="make">LANG=en_US.UTF-8 ninja</userinput></screen>
182<!--
183 <para>To test the package, execute the following command:</para>
184
185<screen><userinput remap="test">LANG=en_US.UTF-8 ninja test</userinput></screen>
186-->
187 <para>Install the package:</para>
188
189<screen><userinput remap="install">LANG=en_US.UTF-8 ninja install</userinput></screen>
190
191 <para>Remove an unnecessary directory:</para>
192
193<screen><userinput remap="install">rm -rfv /usr/lib/rpm
194rm -f /usr/bin/xsltproc</userinput></screen>
195
196 <para>Create the <filename>/etc/machine-id</filename> file needed by
197 <command>systemd-journald</command>:</para>
198
199<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
200
201 <para>Create the <filename>/lib/systemd/systemd-user-sessions</filename>
202 script to allow unprivileged user logins without
203 <application>systemd-logind</application>:</para>
204
205<screen><userinput remap="adjust">cat &gt; /lib/systemd/systemd-user-sessions &lt;&lt; "EOF"
206#!/bin/bash
207rm -f /run/nologin
208EOF
209chmod 755 /lib/systemd/systemd-user-sessions</userinput></screen>
210
211 </sect2>
212
213 <sect2 id="contents-systemd" role="content">
214 <title>Contents of systemd</title>
215
216 <segmentedlist>
217 <segtitle>Installed programs</segtitle>
218 <segtitle>Installed libraries</segtitle>
219 <segtitle>Installed directories</segtitle>
220
221 <seglistitem>
222 <seg>bootctl, busctl, coredumpctl, halt, hostnamectl, init, journalctl,
223 kernel-install, localectl, loginctl, machinectl, networkctl, poweroff,
224 reboot, runlevel, shutdown, systemctl, systemd-analyze,
225 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
226 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
227 systemd-inhibit, systemd-machine-id-setup, systemd-mount,
228 systemd-notify, systemd-nspawn, systemd-path, systemd-resolve,
229 systemd-run, systemd-socket-activate,
230 systemd-stdio-bridge, systemd-tmpfiles, systemd-tty-ask-password-agent,
231 telinit, timedatectl, and udevadm</seg>
232 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
233 libnss_resolve.so.2, libnss_systemd.so.2,
234 libsystemd.so, libsystemd-shared-&systemd-version;.so,
235 and libudev.so</seg>
236 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
237 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
238 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
239 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
240 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
241 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
242 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
243 </seglistitem>
244 </segmentedlist>
245
246 <variablelist>
247 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
248 <?dbfo list-presentation="list"?>
249 <?dbhtml list-presentation="table"?>
250
251 <varlistentry id="bootctl">
252 <term><command>bootctl</command></term>
253 <listitem>
254 <para>Used to query the firmware and boot manager settings</para>
255 <indexterm zone="ch-system-systemd bootctl">
256 <primary sortas="b-bootctl">bootctl</primary>
257 </indexterm>
258 </listitem>
259 </varlistentry>
260
261 <varlistentry id="busctl">
262 <term><command>busctl</command></term>
263 <listitem>
264 <para>Used to introspect and monitor the D-Bus bus</para>
265 <indexterm zone="ch-system-systemd busctl">
266 <primary sortas="b-busctl">busctl</primary>
267 </indexterm>
268 </listitem>
269 </varlistentry>
270
271 <varlistentry id="coredumpctl">
272 <term><command>coredumpctl</command></term>
273 <listitem>
274 <para>Used to retrieve coredumps from the systemd journal</para>
275 <indexterm zone="ch-system-systemd coredumpctl">
276 <primary sortas="b-coredumpctl">coredumpctl</primary>
277 </indexterm>
278 </listitem>
279 </varlistentry>
280
281 <varlistentry id="halt">
282 <term><command>halt</command></term>
283 <listitem>
284 <para>Normally invokes <command>shutdown</command> with the
285 <parameter>-h</parameter> option, except when already in run-level 0,
286 then it tells the kernel to halt the system; it notes in the
287 file <filename>/var/log/wtmp</filename> that the system is being
288 brought down</para>
289 <indexterm zone="ch-system-systemd halt">
290 <primary sortas="b-halt">halt</primary>
291 </indexterm>
292 </listitem>
293 </varlistentry>
294
295 <varlistentry id="hostnamectl">
296 <term><command>hostnamectl</command></term>
297 <listitem>
298 <para>Used to query and change the system hostname and related
299 settings</para>
300 <indexterm zone="ch-system-systemd hostnamectl">
301 <primary sortas="b-hostnamectl">hostnamectl</primary>
302 </indexterm>
303 </listitem>
304 </varlistentry>
305
306 <varlistentry id="init">
307 <term><command>init</command></term>
308 <listitem>
309 <para>The first process to be started when the kernel has initialized
310 the hardware which takes over the boot process and starts all
311 processes according to its configuration files</para>
312 <indexterm zone="ch-system-systemd init">
313 <primary sortas="b-init">init</primary>
314 </indexterm>
315 </listitem>
316 </varlistentry>
317
318 <varlistentry id="journalctl">
319 <term><command>journalctl</command></term>
320 <listitem>
321 <para>Used to query the contents of the systemd journal</para>
322 <indexterm zone="ch-system-systemd journalctl">
323 <primary sortas="b-journalctl">journalctl</primary>
324 </indexterm>
325 </listitem>
326 </varlistentry>
327
328 <varlistentry id="kernel-install">
329 <term><command>kernel-install</command></term>
330 <listitem>
331 <para>Used to add and remove kernel and initramfs images to and
332 from /boot</para>
333 <indexterm zone="ch-system-systemd kernel-install">
334 <primary sortas="b-kernel-install">kernel-install</primary>
335 </indexterm>
336 </listitem>
337 </varlistentry>
338
339 <varlistentry id="localectl">
340 <term><command>localectl</command></term>
341 <listitem>
342 <para>Used to query and change the system locale and keyboard layout
343 settings</para>
344 <indexterm zone="ch-system-systemd localectl">
345 <primary sortas="b-localectl">localectl</primary>
346 </indexterm>
347 </listitem>
348 </varlistentry>
349
350 <varlistentry id="loginctl">
351 <term><command>loginctl</command></term>
352 <listitem>
353 <para>Used to introspect and control the state of the systemd Login
354 Manager</para>
355 <indexterm zone="ch-system-systemd loginctl">
356 <primary sortas="b-loginctl">loginctl</primary>
357 </indexterm>
358 </listitem>
359 </varlistentry>
360
361 <varlistentry id="machinectl">
362 <term><command>machinectl</command></term>
363 <listitem>
364 <para>Used to introspect and control the state of the systemd Virtual
365 Machine and Container Registration Manager</para>
366 <indexterm zone="ch-system-systemd machinectl">
367 <primary sortas="b-machinectl">machinectl</primary>
368 </indexterm>
369 </listitem>
370 </varlistentry>
371
372 <varlistentry id="networkctl">
373 <term><command>networkctl</command></term>
374 <listitem>
375 <para>Used to introspect the state of the network links as seen by
376 systemd-networkd</para>
377 <indexterm zone="ch-system-systemd networkctl">
378 <primary sortas="b-networkctl">networkctl</primary>
379 </indexterm>
380 </listitem>
381 </varlistentry>
382
383 <varlistentry id="poweroff">
384 <term><command>poweroff</command></term>
385 <listitem>
386 <para>Tells the kernel to halt the system and switch off the computer
387 (see <command>halt</command>)</para>
388 <indexterm zone="ch-system-systemd poweroff">
389 <primary sortas="b-poweroff">poweroff</primary>
390 </indexterm>
391 </listitem>
392 </varlistentry>
393
394 <varlistentry id="reboot">
395 <term><command>reboot</command></term>
396 <listitem>
397 <para>Tells the kernel to reboot the system (see
398 <command>halt</command>)</para>
399 <indexterm zone="ch-system-systemd reboot">
400 <primary sortas="b-reboot">reboot</primary>
401 </indexterm>
402 </listitem>
403 </varlistentry>
404
405 <varlistentry id="runlevel">
406 <term><command>runlevel</command></term>
407 <listitem>
408 <para>Reports the previous and the current run-level, as noted in the
409 last run-level record in <filename>/var/run/utmp</filename></para>
410 <indexterm zone="ch-system-systemd runlevel">
411 <primary sortas="b-runlevel">runlevel</primary>
412 </indexterm>
413 </listitem>
414 </varlistentry>
415
416 <varlistentry id="shutdown">
417 <term><command>shutdown</command></term>
418 <listitem>
419 <para>Brings the system down in a secure way, signaling all processes
420 and notifying all logged-in users</para>
421 <indexterm zone="ch-system-systemd shutdown">
422 <primary sortas="b-shutdown">shutdown</primary>
423 </indexterm>
424 </listitem>
425 </varlistentry>
426
427 <varlistentry id="systemctl">
428 <term><command>systemctl</command></term>
429 <listitem>
430 <para>Used to introspect and control the state of the systemd system
431 and service manager</para>
432 <indexterm zone="ch-system-systemd systemctl">
433 <primary sortas="b-systemctl">systemctl</primary>
434 </indexterm>
435 </listitem>
436 </varlistentry>
437
438 <varlistentry id="systemd-analyze">
439 <term><command>systemd-analyze</command></term>
440 <listitem>
441 <para>Used to determine system boot-up performance of the current
442 boot</para>
443 <indexterm zone="ch-system-systemd systemd-analyze">
444 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
445 </indexterm>
446 </listitem>
447 </varlistentry>
448
449 <varlistentry id="systemd-ask-password">
450 <term><command>systemd-ask-password</command></term>
451 <listitem>
452 <para>Used to query a system password or passphrase from the user,
453 using a question message specified on the command line</para>
454 <indexterm zone="ch-system-systemd systemd-ask-password">
455 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
456 </indexterm>
457 </listitem>
458 </varlistentry>
459
460 <varlistentry id="systemd-cat">
461 <term><command>systemd-cat</command></term>
462 <listitem>
463 <para>Used to connect STDOUT and STDERR of a process with the Journal
464 </para>
465 <indexterm zone="ch-system-systemd systemd-cat">
466 <primary sortas="b-systemd-cat">systemd-cat</primary>
467 </indexterm>
468 </listitem>
469 </varlistentry>
470
471 <varlistentry id="systemd-cgls">
472 <term><command>systemd-cgls</command></term>
473 <listitem>
474 <para>Recursively shows the contents of the selected Linux control
475 group hierarchy in a tree</para>
476 <indexterm zone="ch-system-systemd systemd-cgls">
477 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
478 </indexterm>
479 </listitem>
480 </varlistentry>
481
482 <varlistentry id="systemd-cgtop">
483 <term><command>systemd-cgtop</command></term>
484 <listitem>
485 <para>Shows the top control groups of the local Linux control group
486 hierarchy, ordered by their CPU, memory and disk I/O load</para>
487 <indexterm zone="ch-system-systemd systemd-cgtop">
488 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
489 </indexterm>
490 </listitem>
491 </varlistentry>
492
493 <varlistentry id="systemd-delta">
494 <term><command>systemd-delta</command></term>
495 <listitem>
496 <para>Used to identify and compare configuration files in
497 <filename class="directory">/etc</filename> that override default
498 counterparts in <filename class="directory">/usr</filename></para>
499 <indexterm zone="ch-system-systemd systemd-delta">
500 <primary sortas="b-systemd-delta">systemd-delta</primary>
501 </indexterm>
502 </listitem>
503 </varlistentry>
504
505 <varlistentry id="systemd-detect-virt">
506 <term><command>systemd-detect-virt</command></term>
507 <listitem>
508 <para>Detects execution in a virtualized environment</para>
509 <indexterm zone="ch-system-systemd systemd-detect-virt">
510 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
511 </indexterm>
512 </listitem>
513 </varlistentry>
514
515 <varlistentry id="systemd-escape">
516 <term><command>systemd-escape</command></term>
517 <listitem>
518 <para>Used to escape strings for inclusion in systemd unit
519 names</para>
520 <indexterm zone="ch-system-systemd systemd-escape">
521 <primary sortas="b-systemd-escape">systemd-escape</primary>
522 </indexterm>
523 </listitem>
524 </varlistentry>
525
526 <varlistentry id="systemd-hwdb">
527 <term><command>systemd-hwdb</command></term>
528 <listitem>
529 <para>Used to manage hardware database (hwdb)</para>
530 <indexterm zone="ch-system-systemd systemd-hwdb">
531 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
532 </indexterm>
533 </listitem>
534 </varlistentry>
535
536 <varlistentry id="systemd-inhibit">
537 <term><command>systemd-inhibit</command></term>
538 <listitem>
539 <para>Used to execute a program with a shutdown, sleep or idle
540 inhibitor lock taken</para>
541 <indexterm zone="ch-system-systemd systemd-inhibit">
542 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
543 </indexterm>
544 </listitem>
545 </varlistentry>
546
547 <varlistentry id="systemd-machine-id-setup">
548 <term><command>systemd-machine-id-setup</command></term>
549 <listitem>
550 <para>Used by system installer tools to initialize the machine ID
551 stored in <filename>/etc/machine-id</filename> at install time with a
552 randomly generated ID</para>
553 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
554 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
555 </indexterm>
556 </listitem>
557 </varlistentry>
558
559 <varlistentry id="systemd-mount">
560 <term><command>systemd-mount</command></term>
561 <listitem>
562 <para>A tool to temporarily mount or auto-mount a drive.</para>
563 <indexterm zone="ch-system-systemd systemd-mount">
564 <primary sortas="b-systemd-mount">systemd-mount</primary>
565 </indexterm>
566 </listitem>
567 </varlistentry>
568
569 <varlistentry id="systemd-notify">
570 <term><command>systemd-notify</command></term>
571 <listitem>
572 <para>Used by daemon scripts to notify the init system about status
573 changes</para>
574 <indexterm zone="ch-system-systemd systemd-notify">
575 <primary sortas="b-systemd-notify">systemd-notify</primary>
576 </indexterm>
577 </listitem>
578 </varlistentry>
579
580 <varlistentry id="systemd-nspawn">
581 <term><command>systemd-nspawn</command></term>
582 <listitem>
583 <para>Used to run a command or OS in a light-weight namespace
584 container</para>
585 <indexterm zone="ch-system-systemd systemd-nspawn">
586 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
587 </indexterm>
588 </listitem>
589 </varlistentry>
590
591 <varlistentry id="systemd-path">
592 <term><command>systemd-path</command></term>
593 <listitem>
594 <para>Used to query system and user paths</para>
595 <indexterm zone="ch-system-systemd systemd-path">
596 <primary sortas="b-systemd-path">systemd-path</primary>
597 </indexterm>
598 </listitem>
599 </varlistentry>
600
601 <varlistentry id="systemd-resolve">
602 <term><command>systemd-resolve</command></term>
603 <listitem>
604 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
605 resource records, and services</para>
606 <indexterm zone="ch-system-systemd systemd-resolve">
607 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
608 </indexterm>
609 </listitem>
610 </varlistentry>
611
612 <varlistentry id="systemd-run">
613 <term><command>systemd-run</command></term>
614 <listitem>
615 <para>Used to create and start a transient .service or a .scope unit
616 and run the specified command in it</para>
617 <indexterm zone="ch-system-systemd systemd-run">
618 <primary sortas="b-systemd-run">systemd-run</primary>
619 </indexterm>
620 </listitem>
621 </varlistentry>
622
623 <!-- <varlistentry id="systemd-stdio-bridge">
624 <term><command>systemd-stdio-bridge</command></term>
625 <listitem>
626 <para>To be completed</para>
627 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
628 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
629 </indexterm>
630 </listitem>
631 </varlistentry> -->
632
633 <varlistentry id="systemd-socket-activate">
634 <term><command>systemd-socket-activate</command></term>
635 <listitem>
636 <para>A tool to listen on socket devices and launch a process upon
637 connection.</para>
638 <indexterm zone="ch-system-systemd systemd-socket-activate">
639 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
640 </indexterm>
641 </listitem>
642 </varlistentry>
643
644 <varlistentry id="systemd-tmpfiles">
645 <term><command>systemd-tmpfiles</command></term>
646 <listitem>
647 <para>Creates, deletes and cleans up volatile and temporary files and
648 directories, based on the configuration file format and location
649 specified in
650 <filename class="directory">tmpfiles.d</filename> directories</para>
651 <indexterm zone="ch-system-systemd systemd-tmpfiles">
652 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
653 </indexterm>
654 </listitem>
655 </varlistentry>
656
657 <varlistentry id="systemd-tty-ask-password-agent">
658 <term><command>systemd-tty-ask-password-agent</command></term>
659 <listitem>
660 <para>Used to list or process pending systemd password requests</para>
661 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
662 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
663 </indexterm>
664 </listitem>
665 </varlistentry>
666
667 <varlistentry id="telinit">
668 <term><command>telinit</command></term>
669 <listitem>
670 <para>Tells <command>init</command> which run-level to change
671 to</para>
672 <indexterm zone="ch-system-systemd telinit">
673 <primary sortas="b-telinit">telinit</primary>
674 </indexterm>
675 </listitem>
676 </varlistentry>
677
678 <varlistentry id="timedatectl">
679 <term><command>timedatectl</command></term>
680 <listitem>
681 <para>Used to query and change the system clock and its settings
682 </para>
683 <indexterm zone="ch-system-systemd timedatectl">
684 <primary sortas="b-timedatectl">timedatectl</primary>
685 </indexterm>
686 </listitem>
687 </varlistentry>
688
689 <varlistentry id="udevadm">
690 <term><command>udevadm</command></term>
691 <listitem>
692 <para>Generic udev administration tool: controls the udevd daemon,
693 provides info from the Udev database, monitors uevents, waits for
694 uevents to finish, tests udev configuration, and triggers uevents
695 for a given device</para>
696 <indexterm zone="ch-system-systemd udevadm">
697 <primary sortas="b-udevadm">udevadm</primary>
698 </indexterm>
699 </listitem>
700 </varlistentry>
701
702 <varlistentry id="libsystemd">
703 <term><filename class="libraryfile">libsystemd</filename></term>
704 <listitem>
705 <para>The main systemd utility library</para>
706 <indexterm zone="ch-system-systemd libsystemd">
707 <primary sortas="c-libsystemd">libsystemd</primary>
708 </indexterm>
709 </listitem>
710 </varlistentry>
711
712 <varlistentry id="libudev">
713 <term><filename class="libraryfile">libudev</filename></term>
714 <listitem>
715 <para>A library to access Udev device information</para>
716 <indexterm zone="ch-system-systemd libudev">
717 <primary sortas="c-libudev">libudev</primary>
718 </indexterm>
719 </listitem>
720 </varlistentry>
721
722 </variablelist>
723
724 </sect2>
725
726</sect1>
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