source: chapter06/systemd.xml@ 9fde3e9

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Last change on this file since 9fde3e9 was 896e77e, checked in by DJ Lucas <dj@…>, 6 years ago

Remove unneeded group from default udev rules in the systemd book.

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11339 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
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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
47 <para>Set up the man pages:</para>
48
49<screen><userinput remap="pre">tar -xf ../systemd-man-pages-&systemd-version;.tar.xz</userinput></screen>
50
51 <para>Remove tests that cannot be built in chroot:</para>
52
53<screen><userinput remap="pre">sed '179,223d' -i src/resolve/meson.build</userinput></screen>
54
55 <para>Remove an unneeded group,
56 <systemitem class="groupname">render</systemitem>, from the default udev
57 rules:</para>
58
59<screen><userinput remap="pre">sed -i 's/GROUP="render", //' rules/50-udev-default.rules.in</userinput></screen>
60
61 <para>Prepare systemd for compilation:</para>
62
63 <screen><userinput remap="configure">mkdir -p build
64cd build
65
66LANG=en_US.UTF-8 \
67meson --prefix=/usr \
68 --sysconfdir=/etc \
69 --localstatedir=/var \
70 -Dblkid=true \
71 -Dbuildtype=release \
72 -Ddefault-dnssec=no \
73 -Dfirstboot=false \
74 -Dinstall-tests=false \
75 -Dkill-path=/bin/kill \
76 -Dkmod-path=/bin/kmod \
77 -Dldconfig=false \
78 -Dmount-path=/bin/mount \
79 -Drootprefix= \
80 -Drootlibdir=/lib \
81 -Dsplit-usr=true \
82 -Dsulogin-path=/sbin/sulogin \
83 -Dsysusers=false \
84 -Dumount-path=/bin/umount \
85 -Db_lto=false \
86 ..</userinput></screen>
87
88 <variablelist>
89 <title>The meaning of the meson options:</title>
90
91 <varlistentry>
92 <term><parameter>-D*-path=*</parameter></term>
93 <listitem>
94 <para>These switches provide location of binaries needed by
95 systemd at runtime that have not yet been installed, or who's
96 pkgconfig files are currently only in
97 <filename>/tools/lib/pkgconfig</filename>.</para>
98 </listitem>
99 </varlistentry>
100
101 <varlistentry>
102 <term><parameter>-Ddefault-dnssec=no</parameter></term>
103 <listitem>
104 <para>This switch turns off the experimental DNSSEC support.</para>
105 </listitem>
106 </varlistentry>
107
108 <varlistentry>
109 <term><parameter>-Dfirstboot=false</parameter></term>
110 <listitem>
111 <para>This switch prevents installation of systemd
112 services responsible for setting up the system for
113 the first time. They are not useful for LFS because
114 everything is done manually.</para>
115 </listitem>
116 </varlistentry>
117
118 <varlistentry>
119 <term><parameter>-Dinstall-tests=false</parameter></term>
120 <listitem>
121 <para>This switch prevents installation of the compiled tests.</para>
122 </listitem>
123 </varlistentry>
124
125 <varlistentry>
126 <term><parameter>-Dldconfig=no</parameter></term>
127 <listitem>
128 <para>This switch prevents installation of a systemd
129 unit that runs <command>ldconfig</command> at
130 boot, making the boot time longer. Remove it if the
131 described feature is desired, even though it's not
132 useful for source distributions such as LFS.</para>
133 </listitem>
134 </varlistentry>
135
136 <varlistentry>
137 <term><parameter>-Droot*</parameter></term>
138 <listitem>
139 <para>These switches ensure that core programs and
140 shared libraries are installed in the subdirectories
141 of the root partition.</para>
142 </listitem>
143 </varlistentry>
144
145 <varlistentry>
146 <term><parameter>-Dsplit-usr=true</parameter></term>
147 <listitem>
148 <para>This switch ensures that systemd will work on
149 systems where /bin, /lib and /sbin directories are not
150 symlinks to their /usr counterparts.</para>
151 </listitem>
152 </varlistentry>
153
154 <varlistentry>
155 <term><parameter>-Dsysusers=false</parameter></term>
156 <listitem>
157 <para>This switch prevents installation of systemd
158 services responsible for setting up the
159 <filename>/etc/group</filename> and
160 <filename>/etc/passwd</filename> files. Both files
161 were created early in this chapter.</para>
162 </listitem>
163 </varlistentry>
164
165 </variablelist>
166
167 <para>Compile the package:</para>
168
169<screen><userinput remap="make">LANG=en_US.UTF-8 ninja</userinput></screen>
170<!--
171 <para>To test the package, execute the following command:</para>
172
173<screen><userinput remap="test">LANG=en_US.UTF-8 ninja test</userinput></screen>
174-->
175 <para>Install the package:</para>
176
177<screen><userinput remap="install">LANG=en_US.UTF-8 ninja install</userinput></screen>
178
179 <para>Remove an unnecessary directory:</para>
180
181<screen><userinput remap="install">rm -rfv /usr/lib/rpm</userinput></screen>
182
183 <para>Create the Sysvinit compatibility symlinks, so systemd is used
184 as the default init system:</para>
185
186<screen><userinput remap="install">for tool in runlevel reboot shutdown poweroff halt telinit; do
187 ln -sfv ../bin/systemctl /sbin/${tool}
188done
189ln -sfv ../lib/systemd/systemd /sbin/init</userinput></screen>
190
191 <para>Remove our earlier created symlink for xsltproc:</para>
192
193<screen><userinput remap="install">rm -f /usr/bin/xsltproc</userinput></screen>
194
195 <para>Create the <filename>/etc/machine-id</filename> file needed by
196 <command>systemd-journald</command>:</para>
197
198<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
199
200 <para>Create the <filename>/lib/systemd/systemd-user-sessions</filename>
201 script to allow unprivileged user logins without
202 <application>systemd-logind</application>:</para>
203
204<screen><userinput remap="adjust">cat &gt; /lib/systemd/systemd-user-sessions &lt;&lt; "EOF"
205#!/bin/bash
206rm -f /run/nologin
207EOF
208chmod 755 /lib/systemd/systemd-user-sessions</userinput></screen>
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>bootctl, busctl, coredumpctl, halt, hostnamectl, init, journalctl,
222 kernel-install, localectl, loginctl, machinectl, networkctl, poweroff,
223 reboot, runlevel, shutdown, systemctl, systemd-analyze,
224 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
225 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
226 systemd-inhibit, systemd-machine-id-setup, systemd-mount,
227 systemd-notify, systemd-nspawn, systemd-path, systemd-resolve,
228 systemd-run, systemd-socket-activate,
229 systemd-stdio-bridge, systemd-tmpfiles, systemd-tty-ask-password-agent,
230 telinit, timedatectl, and udevadm</seg>
231 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
232 libnss_resolve.so.2, libnss_systemd.so.2,
233 libsystemd.so, libsystemd-shared-231.so,
234 and libudev.so</seg>
235 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
236 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
237 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
238 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
239 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
240 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
241 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
242 </seglistitem>
243 </segmentedlist>
244
245 <variablelist>
246 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
247 <?dbfo list-presentation="list"?>
248 <?dbhtml list-presentation="table"?>
249
250 <varlistentry id="bootctl">
251 <term><command>bootctl</command></term>
252 <listitem>
253 <para>used to query the firmware and boot manager settings</para>
254 <indexterm zone="ch-system-systemd bootctl">
255 <primary sortas="b-bootctl">bootctl</primary>
256 </indexterm>
257 </listitem>
258 </varlistentry>
259
260 <varlistentry id="busctl">
261 <term><command>busctl</command></term>
262 <listitem>
263 <para>Used to introspect and monitor the D-Bus bus</para>
264 <indexterm zone="ch-system-systemd busctl">
265 <primary sortas="b-busctl">busctl</primary>
266 </indexterm>
267 </listitem>
268 </varlistentry>
269
270 <varlistentry id="coredumpctl">
271 <term><command>coredumpctl</command></term>
272 <listitem>
273 <para>Used to retrieve coredumps from the systemd Journal</para>
274 <indexterm zone="ch-system-systemd coredumpctl">
275 <primary sortas="b-coredumpctl">coredumpctl</primary>
276 </indexterm>
277 </listitem>
278 </varlistentry>
279
280 <varlistentry id="halt">
281 <term><command>halt</command></term>
282 <listitem>
283 <para>Normally invokes <command>shutdown</command> with the
284 <parameter>-h</parameter> option, except when already in run-level 0,
285 then it tells the kernel to halt the system; it notes in the
286 file <filename>/var/log/wtmp</filename> that the system is being
287 brought down</para>
288 <indexterm zone="ch-system-systemd halt">
289 <primary sortas="b-halt">halt</primary>
290 </indexterm>
291 </listitem>
292 </varlistentry>
293
294 <varlistentry id="hostnamectl">
295 <term><command>hostnamectl</command></term>
296 <listitem>
297 <para>Used to query and change the system hostname and related
298 settings</para>
299 <indexterm zone="ch-system-systemd hostnamectl">
300 <primary sortas="b-hostnamectl">hostnamectl</primary>
301 </indexterm>
302 </listitem>
303 </varlistentry>
304
305 <varlistentry id="init">
306 <term><command>init</command></term>
307 <listitem>
308 <para>The first process to be started when the kernel has initialized
309 the hardware which takes over the boot process and starts all the
310 proceses it is instructed to</para>
311 <indexterm zone="ch-system-systemd init">
312 <primary sortas="b-init">init</primary>
313 </indexterm>
314 </listitem>
315 </varlistentry>
316
317 <varlistentry id="journalctl">
318 <term><command>journalctl</command></term>
319 <listitem>
320 <para>Used to query the contents of the systemd Journal</para>
321 <indexterm zone="ch-system-systemd journalctl">
322 <primary sortas="b-journalctl">journalctl</primary>
323 </indexterm>
324 </listitem>
325 </varlistentry>
326
327 <varlistentry id="kernel-install">
328 <term><command>kernel-install</command></term>
329 <listitem>
330 <para>Used to add and remove kernel and initramfs images to and
331 from /boot</para>
332 <indexterm zone="ch-system-systemd kernel-install">
333 <primary sortas="b-kernel-install">kernel-install</primary>
334 </indexterm>
335 </listitem>
336 </varlistentry>
337
338 <varlistentry id="localectl">
339 <term><command>localectl</command></term>
340 <listitem>
341 <para>Used to query and change the system locale and keyboard layout
342 settings</para>
343 <indexterm zone="ch-system-systemd localectl">
344 <primary sortas="b-localectl">localectl</primary>
345 </indexterm>
346 </listitem>
347 </varlistentry>
348
349 <varlistentry id="loginctl">
350 <term><command>loginctl</command></term>
351 <listitem>
352 <para>Used to introspect and control the state of the systemd Login
353 Manager</para>
354 <indexterm zone="ch-system-systemd loginctl">
355 <primary sortas="b-loginctl">loginctl</primary>
356 </indexterm>
357 </listitem>
358 </varlistentry>
359
360 <varlistentry id="machinectl">
361 <term><command>machinectl</command></term>
362 <listitem>
363 <para>Used to introspect and control the state of the systemd Virtual
364 Machine and Container Registration Manager</para>
365 <indexterm zone="ch-system-systemd machinectl">
366 <primary sortas="b-machinectl">machinectl</primary>
367 </indexterm>
368 </listitem>
369 </varlistentry>
370
371 <varlistentry id="networkctl">
372 <term><command>networkctl</command></term>
373 <listitem>
374 <para>Used to introspect the state of the network links as seen by
375 systemd-networkd</para>
376 <indexterm zone="ch-system-systemd networkctl">
377 <primary sortas="b-networkctl">networkctl</primary>
378 </indexterm>
379 </listitem>
380 </varlistentry>
381
382 <varlistentry id="poweroff">
383 <term><command>poweroff</command></term>
384 <listitem>
385 <para>Tells the kernel to halt the system and switch off the computer
386 (see <command>halt</command>)</para>
387 <indexterm zone="ch-system-systemd poweroff">
388 <primary sortas="b-poweroff">poweroff</primary>
389 </indexterm>
390 </listitem>
391 </varlistentry>
392
393 <varlistentry id="reboot">
394 <term><command>reboot</command></term>
395 <listitem>
396 <para>Tells the kernel to reboot the system (see
397 <command>halt</command>)</para>
398 <indexterm zone="ch-system-systemd reboot">
399 <primary sortas="b-reboot">reboot</primary>
400 </indexterm>
401 </listitem>
402 </varlistentry>
403
404 <varlistentry id="runlevel">
405 <term><command>runlevel</command></term>
406 <listitem>
407 <para>Reports the previous and the current run-level, as noted in the
408 last run-level record in <filename>/var/run/utmp</filename></para>
409 <indexterm zone="ch-system-systemd runlevel">
410 <primary sortas="b-runlevel">runlevel</primary>
411 </indexterm>
412 </listitem>
413 </varlistentry>
414
415 <varlistentry id="shutdown">
416 <term><command>shutdown</command></term>
417 <listitem>
418 <para>Brings the system down in a secure way, signaling all processes
419 and notifying all logged-in users</para>
420 <indexterm zone="ch-system-systemd shutdown">
421 <primary sortas="b-shutdown">shutdown</primary>
422 </indexterm>
423 </listitem>
424 </varlistentry>
425
426 <varlistentry id="systemctl">
427 <term><command>systemctl</command></term>
428 <listitem>
429 <para>Used to introspect and control the state of the systemd system
430 and service manager</para>
431 <indexterm zone="ch-system-systemd systemctl">
432 <primary sortas="b-systemctl">systemctl</primary>
433 </indexterm>
434 </listitem>
435 </varlistentry>
436
437 <varlistentry id="systemd-analyze">
438 <term><command>systemd-analyze</command></term>
439 <listitem>
440 <para>Used to determine system boot-up performance of the current
441 boot</para>
442 <indexterm zone="ch-system-systemd systemd-analyze">
443 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
444 </indexterm>
445 </listitem>
446 </varlistentry>
447
448 <varlistentry id="systemd-ask-password">
449 <term><command>systemd-ask-password</command></term>
450 <listitem>
451 <para>Used to query a system password or passphrase from the user,
452 using a question message specified on the command line</para>
453 <indexterm zone="ch-system-systemd systemd-ask-password">
454 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
455 </indexterm>
456 </listitem>
457 </varlistentry>
458
459 <varlistentry id="systemd-cat">
460 <term><command>systemd-cat</command></term>
461 <listitem>
462 <para>Used to connect STDOUT and STDERR of a process with the Journal
463 </para>
464 <indexterm zone="ch-system-systemd systemd-cat">
465 <primary sortas="b-systemd-cat">systemd-cat</primary>
466 </indexterm>
467 </listitem>
468 </varlistentry>
469
470 <varlistentry id="systemd-cgls">
471 <term><command>systemd-cgls</command></term>
472 <listitem>
473 <para>Recursively shows the contents of the selected Linux control
474 group hierarchy in a tree</para>
475 <indexterm zone="ch-system-systemd systemd-cgls">
476 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
477 </indexterm>
478 </listitem>
479 </varlistentry>
480
481 <varlistentry id="systemd-cgtop">
482 <term><command>systemd-cgtop</command></term>
483 <listitem>
484 <para>Shows the top control groups of the local Linux control group
485 hierarchy, ordered by their CPU, memory and disk I/O load</para>
486 <indexterm zone="ch-system-systemd systemd-cgtop">
487 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
488 </indexterm>
489 </listitem>
490 </varlistentry>
491
492 <varlistentry id="systemd-delta">
493 <term><command>systemd-delta</command></term>
494 <listitem>
495 <para>Used to identify and compare configuration files in
496 <filename class="directory">/etc</filename> that override default
497 counterparts in <filename class="directory">/usr</filename></para>
498 <indexterm zone="ch-system-systemd systemd-delta">
499 <primary sortas="b-systemd-delta">systemd-delta</primary>
500 </indexterm>
501 </listitem>
502 </varlistentry>
503
504 <varlistentry id="systemd-detect-virt">
505 <term><command>systemd-detect-virt</command></term>
506 <listitem>
507 <para>Detects execution in a virtualized environment</para>
508 <indexterm zone="ch-system-systemd systemd-detect-virt">
509 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
510 </indexterm>
511 </listitem>
512 </varlistentry>
513
514 <varlistentry id="systemd-escape">
515 <term><command>systemd-escape</command></term>
516 <listitem>
517 <para>Used to escape strings for inclusion in systemd unit
518 names</para>
519 <indexterm zone="ch-system-systemd systemd-escape">
520 <primary sortas="b-systemd-escape">systemd-escape</primary>
521 </indexterm>
522 </listitem>
523 </varlistentry>
524
525 <varlistentry id="systemd-hwdb">
526 <term><command>systemd-hwdb</command></term>
527 <listitem>
528 <para>Used to manage hardware database (hwdb)</para>
529 <indexterm zone="ch-system-systemd systemd-hwdb">
530 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
531 </indexterm>
532 </listitem>
533 </varlistentry>
534
535 <varlistentry id="systemd-inhibit">
536 <term><command>systemd-inhibit</command></term>
537 <listitem>
538 <para>Used to execute a program with a shutdown, sleep or idle
539 inhibitor lock taken</para>
540 <indexterm zone="ch-system-systemd systemd-inhibit">
541 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
542 </indexterm>
543 </listitem>
544 </varlistentry>
545
546 <varlistentry id="systemd-machine-id-setup">
547 <term><command>systemd-machine-id-setup</command></term>
548 <listitem>
549 <para>Used by system installer tools to initialize the machine ID
550 stored in <filename>/etc/machine-id</filename> at install time with a
551 randomly generated ID</para>
552 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
553 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
554 </indexterm>
555 </listitem>
556 </varlistentry>
557
558 <varlistentry id="systemd-mount">
559 <term><command>systemd-mount</command></term>
560 <listitem>
561 <para>is a tool to temporarily mount or auto-mount a drive.</para>
562 <indexterm zone="ch-system-systemd systemd-mount">
563 <primary sortas="b-systemd-mount">systemd-mount</primary>
564 </indexterm>
565 </listitem>
566 </varlistentry>
567
568 <varlistentry id="systemd-notify">
569 <term><command>systemd-notify</command></term>
570 <listitem>
571 <para>Used by daemon scripts to notify the init system about status
572 changes</para>
573 <indexterm zone="ch-system-systemd systemd-notify">
574 <primary sortas="b-systemd-notify">systemd-notify</primary>
575 </indexterm>
576 </listitem>
577 </varlistentry>
578
579 <varlistentry id="systemd-nspawn">
580 <term><command>systemd-nspawn</command></term>
581 <listitem>
582 <para>Used to run a command or OS in a light-weight namespace
583 container</para>
584 <indexterm zone="ch-system-systemd systemd-nspawn">
585 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
586 </indexterm>
587 </listitem>
588 </varlistentry>
589
590 <varlistentry id="systemd-path">
591 <term><command>systemd-path</command></term>
592 <listitem>
593 <para>Used to query system and user paths</para>
594 <indexterm zone="ch-system-systemd systemd-path">
595 <primary sortas="b-systemd-path">systemd-path</primary>
596 </indexterm>
597 </listitem>
598 </varlistentry>
599
600 <varlistentry id="systemd-resolve">
601 <term><command>systemd-resolve</command></term>
602 <listitem>
603 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
604 resource records, and services</para>
605 <indexterm zone="ch-system-systemd systemd-resolve">
606 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
607 </indexterm>
608 </listitem>
609 </varlistentry>
610
611 <varlistentry id="systemd-run">
612 <term><command>systemd-run</command></term>
613 <listitem>
614 <para>Used to create and start a transient .service or a .scope unit
615 and run the specified command in it</para>
616 <indexterm zone="ch-system-systemd systemd-run">
617 <primary sortas="b-systemd-run">systemd-run</primary>
618 </indexterm>
619 </listitem>
620 </varlistentry>
621
622 <!-- <varlistentry id="systemd-stdio-bridge">
623 <term><command>systemd-stdio-bridge</command></term>
624 <listitem>
625 <para>To be completed</para>
626 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
627 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
628 </indexterm>
629 </listitem>
630 </varlistentry> -->
631
632 <varlistentry id="systemd-socket-activate">
633 <term><command>systemd-socket-activate</command></term>
634 <listitem>
635 <para>is a tool to listen on socket devices and launch a process upon
636 connection.</para>
637 <indexterm zone="ch-system-systemd systemd-socket-activate">
638 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
639 </indexterm>
640 </listitem>
641 </varlistentry>
642
643 <varlistentry id="systemd-tmpfiles">
644 <term><command>systemd-tmpfiles</command></term>
645 <listitem>
646 <para>Creates, deletes and cleans up volatile and temporary files and
647 directories, based on the configuration file format and location
648 specified in
649 <filename class="directory">tmpfiles.d</filename> directories</para>
650 <indexterm zone="ch-system-systemd systemd-tmpfiles">
651 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
652 </indexterm>
653 </listitem>
654 </varlistentry>
655
656 <varlistentry id="systemd-tty-ask-password-agent">
657 <term><command>systemd-tty-ask-password-agent</command></term>
658 <listitem>
659 <para>Used to list or process pending systemd password requests</para>
660 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
661 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
662 </indexterm>
663 </listitem>
664 </varlistentry>
665
666 <varlistentry id="telinit">
667 <term><command>telinit</command></term>
668 <listitem>
669 <para>Tells <command>init</command> which run-level to change
670 to</para>
671 <indexterm zone="ch-system-systemd telinit">
672 <primary sortas="b-telinit">telinit</primary>
673 </indexterm>
674 </listitem>
675 </varlistentry>
676
677 <varlistentry id="timedatectl">
678 <term><command>timedatectl</command></term>
679 <listitem>
680 <para>Used to query and change the system clock and its settings
681 </para>
682 <indexterm zone="ch-system-systemd timedatectl">
683 <primary sortas="b-timedatectl">timedatectl</primary>
684 </indexterm>
685 </listitem>
686 </varlistentry>
687
688 <varlistentry id="udevadm">
689 <term><command>udevadm</command></term>
690 <listitem>
691 <para>Generic Udev administration tool: controls the udevd daemon,
692 provides info from the Udev database, monitors uevents, waits for
693 uevents to finish, tests Udev configuration, and triggers uevents
694 for a given device</para>
695 <indexterm zone="ch-system-systemd udevadm">
696 <primary sortas="b-udevadm">udevadm</primary>
697 </indexterm>
698 </listitem>
699 </varlistentry>
700
701 <varlistentry id="libsystemd">
702 <term><filename class="libraryfile">libsystemd</filename></term>
703 <listitem>
704 <para>systemd utility library</para>
705 <indexterm zone="ch-system-systemd libsystemd">
706 <primary sortas="c-libsystemd">libsystemd</primary>
707 </indexterm>
708 </listitem>
709 </varlistentry>
710
711 <varlistentry id="libudev">
712 <term><filename class="libraryfile">libudev</filename></term>
713 <listitem>
714 <para>A library to access Udev device information</para>
715 <indexterm zone="ch-system-systemd libudev">
716 <primary sortas="c-libudev">libudev</primary>
717 </indexterm>
718 </listitem>
719 </varlistentry>
720
721 </variablelist>
722
723 </sect2>
724
725</sect1>
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