source: chapter06/systemd.xml@ ad1ccc7

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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 '178,222d' -i src/resolve/meson.build</userinput></screen>
54
55<!-- These are from upstream. There will probably be a new release shortly,
56 so don't bother with a patch. -->
57 <para>Make some fixes from upstream:</para>
58
59<screen><userinput remap="pre">sed -i '527,565 d' src/basic/missing.h
60sed -i '24 d' src/core/load-fragment.c
61sed -i '53 a#include &lt;sys/mount.h&gt;' src/shared/bus-unit-util.c</userinput></screen>
62
63 <para>Remove an unneeded group,
64 <systemitem class="groupname">render</systemitem>, from the default udev
65 rules:</para>
66
67<screen><userinput remap="pre">sed -i 's/GROUP="render", //' rules/50-udev-default.rules.in</userinput></screen>
68
69 <para>Prepare systemd for compilation:</para>
70
71 <screen><userinput remap="configure">mkdir -p build
72cd build
73
74LANG=en_US.UTF-8 \
75meson --prefix=/usr \
76 --sysconfdir=/etc \
77 --localstatedir=/var \
78 -Dblkid=true \
79 -Dbuildtype=release \
80 -Ddefault-dnssec=no \
81 -Dfirstboot=false \
82 -Dinstall-tests=false \
83 -Dkill-path=/bin/kill \
84 -Dkmod-path=/bin/kmod \
85 -Dldconfig=false \
86 -Dmount-path=/bin/mount \
87 -Drootprefix= \
88 -Drootlibdir=/lib \
89 -Dsplit-usr=true \
90 -Dsulogin-path=/sbin/sulogin \
91 -Dsysusers=false \
92 -Dumount-path=/bin/umount \
93 -Db_lto=false \
94 ..</userinput></screen>
95
96 <variablelist>
97 <title>The meaning of the meson options:</title>
98
99 <varlistentry>
100 <term><parameter>-D*-path=*</parameter></term>
101 <listitem>
102 <para>These switches provide location of binaries needed by
103 systemd at runtime that have not yet been installed, or who's
104 pkgconfig files are currently only in
105 <filename>/tools/lib/pkgconfig</filename>.</para>
106 </listitem>
107 </varlistentry>
108
109 <varlistentry>
110 <term><parameter>-Ddefault-dnssec=no</parameter></term>
111 <listitem>
112 <para>This switch turns off the experimental DNSSEC support.</para>
113 </listitem>
114 </varlistentry>
115
116 <varlistentry>
117 <term><parameter>-Dfirstboot=false</parameter></term>
118 <listitem>
119 <para>This switch prevents installation of systemd
120 services responsible for setting up the system for
121 the first time. They are not useful for LFS because
122 everything is done manually.</para>
123 </listitem>
124 </varlistentry>
125
126 <varlistentry>
127 <term><parameter>-Dinstall-tests=false</parameter></term>
128 <listitem>
129 <para>This switch prevents installation of the compiled tests.</para>
130 </listitem>
131 </varlistentry>
132
133 <varlistentry>
134 <term><parameter>-Dldconfig=false</parameter></term>
135 <listitem>
136 <para>This switch prevents installation of a systemd unit that runs
137 <command>ldconfig</command> at boot, which is not useful for source
138 distributions such as LFS and makes the boot time longer. Remove it
139 if the described feature is desired.</para>
140 </listitem>
141 </varlistentry>
142
143 <varlistentry>
144 <term><parameter>-Droot*</parameter></term>
145 <listitem>
146 <para>These switches ensure that core programs and
147 shared libraries are installed in the subdirectories
148 of the root partition.</para>
149 </listitem>
150 </varlistentry>
151
152 <varlistentry>
153 <term><parameter>-Dsplit-usr=true</parameter></term>
154 <listitem>
155 <para>This switch ensures that systemd will work on
156 systems where /bin, /lib and /sbin directories are not
157 symlinks to their /usr counterparts.</para>
158 </listitem>
159 </varlistentry>
160
161 <varlistentry>
162 <term><parameter>-Dsysusers=false</parameter></term>
163 <listitem>
164 <para>This switch prevents installation of systemd
165 services responsible for setting up the
166 <filename>/etc/group</filename> and
167 <filename>/etc/passwd</filename> files. Both files
168 were created earlier in this chapter.</para>
169 </listitem>
170 </varlistentry>
171
172 </variablelist>
173
174 <para>Compile the package:</para>
175
176<screen><userinput remap="make">LANG=en_US.UTF-8 ninja</userinput></screen>
177<!--
178 <para>To test the package, execute the following command:</para>
179
180<screen><userinput remap="test">LANG=en_US.UTF-8 ninja test</userinput></screen>
181-->
182 <para>Install the package:</para>
183
184<screen><userinput remap="install">LANG=en_US.UTF-8 ninja install</userinput></screen>
185
186 <para>Remove an unnecessary directory:</para>
187
188<screen><userinput remap="install">rm -rfv /usr/lib/rpm</userinput></screen>
189
190 <para>Create the Sysvinit compatibility symlinks, so systemd is used
191 as the default init system:</para>
192
193<screen><userinput remap="install">for tool in runlevel reboot shutdown poweroff halt telinit; do
194 ln -sfv ../bin/systemctl /sbin/${tool}
195done
196ln -sfv ../lib/systemd/systemd /sbin/init</userinput></screen>
197
198 <para>Remove our earlier created symlink for xsltproc:</para>
199
200<screen><userinput remap="install">rm -f /usr/bin/xsltproc</userinput></screen>
201
202 <para>Create the <filename>/etc/machine-id</filename> file needed by
203 <command>systemd-journald</command>:</para>
204
205<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
206
207 <para>Create the <filename>/lib/systemd/systemd-user-sessions</filename>
208 script to allow unprivileged user logins without
209 <application>systemd-logind</application>:</para>
210
211<screen><userinput remap="adjust">cat &gt; /lib/systemd/systemd-user-sessions &lt;&lt; "EOF"
212#!/bin/bash
213rm -f /run/nologin
214EOF
215chmod 755 /lib/systemd/systemd-user-sessions</userinput></screen>
216
217 </sect2>
218
219 <sect2 id="contents-systemd" role="content">
220 <title>Contents of systemd</title>
221
222 <segmentedlist>
223 <segtitle>Installed programs</segtitle>
224 <segtitle>Installed libraries</segtitle>
225 <segtitle>Installed directories</segtitle>
226
227 <seglistitem>
228 <seg>bootctl, busctl, coredumpctl, halt, hostnamectl, init, journalctl,
229 kernel-install, localectl, loginctl, machinectl, networkctl, poweroff,
230 reboot, runlevel, shutdown, systemctl, systemd-analyze,
231 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
232 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
233 systemd-inhibit, systemd-machine-id-setup, systemd-mount,
234 systemd-notify, systemd-nspawn, systemd-path, systemd-resolve,
235 systemd-run, systemd-socket-activate,
236 systemd-stdio-bridge, systemd-tmpfiles, systemd-tty-ask-password-agent,
237 telinit, timedatectl, and udevadm</seg>
238 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
239 libnss_resolve.so.2, libnss_systemd.so.2,
240 libsystemd.so, libsystemd-shared-231.so,
241 and libudev.so</seg>
242 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
243 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
244 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
245 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
246 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
247 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
248 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
249 </seglistitem>
250 </segmentedlist>
251
252 <variablelist>
253 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
254 <?dbfo list-presentation="list"?>
255 <?dbhtml list-presentation="table"?>
256
257 <varlistentry id="bootctl">
258 <term><command>bootctl</command></term>
259 <listitem>
260 <para>Used to query the firmware and boot manager settings</para>
261 <indexterm zone="ch-system-systemd bootctl">
262 <primary sortas="b-bootctl">bootctl</primary>
263 </indexterm>
264 </listitem>
265 </varlistentry>
266
267 <varlistentry id="busctl">
268 <term><command>busctl</command></term>
269 <listitem>
270 <para>Used to introspect and monitor the D-Bus bus</para>
271 <indexterm zone="ch-system-systemd busctl">
272 <primary sortas="b-busctl">busctl</primary>
273 </indexterm>
274 </listitem>
275 </varlistentry>
276
277 <varlistentry id="coredumpctl">
278 <term><command>coredumpctl</command></term>
279 <listitem>
280 <para>Used to retrieve coredumps from the systemd Journal</para>
281 <indexterm zone="ch-system-systemd coredumpctl">
282 <primary sortas="b-coredumpctl">coredumpctl</primary>
283 </indexterm>
284 </listitem>
285 </varlistentry>
286
287 <varlistentry id="halt">
288 <term><command>halt</command></term>
289 <listitem>
290 <para>Normally invokes <command>shutdown</command> with the
291 <parameter>-h</parameter> option, except when already in run-level 0,
292 then it tells the kernel to halt the system; it notes in the
293 file <filename>/var/log/wtmp</filename> that the system is being
294 brought down</para>
295 <indexterm zone="ch-system-systemd halt">
296 <primary sortas="b-halt">halt</primary>
297 </indexterm>
298 </listitem>
299 </varlistentry>
300
301 <varlistentry id="hostnamectl">
302 <term><command>hostnamectl</command></term>
303 <listitem>
304 <para>Used to query and change the system hostname and related
305 settings</para>
306 <indexterm zone="ch-system-systemd hostnamectl">
307 <primary sortas="b-hostnamectl">hostnamectl</primary>
308 </indexterm>
309 </listitem>
310 </varlistentry>
311
312 <varlistentry id="init">
313 <term><command>init</command></term>
314 <listitem>
315 <para>The first process to be started when the kernel has initialized
316 the hardware which takes over the boot process and starts all
317 processes according to its configuration files</para>
318 <indexterm zone="ch-system-systemd init">
319 <primary sortas="b-init">init</primary>
320 </indexterm>
321 </listitem>
322 </varlistentry>
323
324 <varlistentry id="journalctl">
325 <term><command>journalctl</command></term>
326 <listitem>
327 <para>Used to query the contents of the systemd journal</para>
328 <indexterm zone="ch-system-systemd journalctl">
329 <primary sortas="b-journalctl">journalctl</primary>
330 </indexterm>
331 </listitem>
332 </varlistentry>
333
334 <varlistentry id="kernel-install">
335 <term><command>kernel-install</command></term>
336 <listitem>
337 <para>Used to add and remove kernel and initramfs images to and
338 from /boot</para>
339 <indexterm zone="ch-system-systemd kernel-install">
340 <primary sortas="b-kernel-install">kernel-install</primary>
341 </indexterm>
342 </listitem>
343 </varlistentry>
344
345 <varlistentry id="localectl">
346 <term><command>localectl</command></term>
347 <listitem>
348 <para>Used to query and change the system locale and keyboard layout
349 settings</para>
350 <indexterm zone="ch-system-systemd localectl">
351 <primary sortas="b-localectl">localectl</primary>
352 </indexterm>
353 </listitem>
354 </varlistentry>
355
356 <varlistentry id="loginctl">
357 <term><command>loginctl</command></term>
358 <listitem>
359 <para>Used to introspect and control the state of the systemd Login
360 Manager</para>
361 <indexterm zone="ch-system-systemd loginctl">
362 <primary sortas="b-loginctl">loginctl</primary>
363 </indexterm>
364 </listitem>
365 </varlistentry>
366
367 <varlistentry id="machinectl">
368 <term><command>machinectl</command></term>
369 <listitem>
370 <para>Used to introspect and control the state of the systemd Virtual
371 Machine and Container Registration Manager</para>
372 <indexterm zone="ch-system-systemd machinectl">
373 <primary sortas="b-machinectl">machinectl</primary>
374 </indexterm>
375 </listitem>
376 </varlistentry>
377
378 <varlistentry id="networkctl">
379 <term><command>networkctl</command></term>
380 <listitem>
381 <para>Used to introspect the state of the network links as seen by
382 systemd-networkd</para>
383 <indexterm zone="ch-system-systemd networkctl">
384 <primary sortas="b-networkctl">networkctl</primary>
385 </indexterm>
386 </listitem>
387 </varlistentry>
388
389 <varlistentry id="poweroff">
390 <term><command>poweroff</command></term>
391 <listitem>
392 <para>Tells the kernel to halt the system and switch off the computer
393 (see <command>halt</command>)</para>
394 <indexterm zone="ch-system-systemd poweroff">
395 <primary sortas="b-poweroff">poweroff</primary>
396 </indexterm>
397 </listitem>
398 </varlistentry>
399
400 <varlistentry id="reboot">
401 <term><command>reboot</command></term>
402 <listitem>
403 <para>Tells the kernel to reboot the system (see
404 <command>halt</command>)</para>
405 <indexterm zone="ch-system-systemd reboot">
406 <primary sortas="b-reboot">reboot</primary>
407 </indexterm>
408 </listitem>
409 </varlistentry>
410
411 <varlistentry id="runlevel">
412 <term><command>runlevel</command></term>
413 <listitem>
414 <para>Reports the previous and the current run-level, as noted in the
415 last run-level record in <filename>/var/run/utmp</filename></para>
416 <indexterm zone="ch-system-systemd runlevel">
417 <primary sortas="b-runlevel">runlevel</primary>
418 </indexterm>
419 </listitem>
420 </varlistentry>
421
422 <varlistentry id="shutdown">
423 <term><command>shutdown</command></term>
424 <listitem>
425 <para>Brings the system down in a secure way, signaling all processes
426 and notifying all logged-in users</para>
427 <indexterm zone="ch-system-systemd shutdown">
428 <primary sortas="b-shutdown">shutdown</primary>
429 </indexterm>
430 </listitem>
431 </varlistentry>
432
433 <varlistentry id="systemctl">
434 <term><command>systemctl</command></term>
435 <listitem>
436 <para>Used to introspect and control the state of the systemd system
437 and service manager</para>
438 <indexterm zone="ch-system-systemd systemctl">
439 <primary sortas="b-systemctl">systemctl</primary>
440 </indexterm>
441 </listitem>
442 </varlistentry>
443
444 <varlistentry id="systemd-analyze">
445 <term><command>systemd-analyze</command></term>
446 <listitem>
447 <para>Used to determine system boot-up performance of the current
448 boot</para>
449 <indexterm zone="ch-system-systemd systemd-analyze">
450 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
451 </indexterm>
452 </listitem>
453 </varlistentry>
454
455 <varlistentry id="systemd-ask-password">
456 <term><command>systemd-ask-password</command></term>
457 <listitem>
458 <para>Used to query a system password or passphrase from the user,
459 using a question message specified on the command line</para>
460 <indexterm zone="ch-system-systemd systemd-ask-password">
461 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
462 </indexterm>
463 </listitem>
464 </varlistentry>
465
466 <varlistentry id="systemd-cat">
467 <term><command>systemd-cat</command></term>
468 <listitem>
469 <para>Used to connect STDOUT and STDERR of a process with the Journal
470 </para>
471 <indexterm zone="ch-system-systemd systemd-cat">
472 <primary sortas="b-systemd-cat">systemd-cat</primary>
473 </indexterm>
474 </listitem>
475 </varlistentry>
476
477 <varlistentry id="systemd-cgls">
478 <term><command>systemd-cgls</command></term>
479 <listitem>
480 <para>Recursively shows the contents of the selected Linux control
481 group hierarchy in a tree</para>
482 <indexterm zone="ch-system-systemd systemd-cgls">
483 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
484 </indexterm>
485 </listitem>
486 </varlistentry>
487
488 <varlistentry id="systemd-cgtop">
489 <term><command>systemd-cgtop</command></term>
490 <listitem>
491 <para>Shows the top control groups of the local Linux control group
492 hierarchy, ordered by their CPU, memory and disk I/O load</para>
493 <indexterm zone="ch-system-systemd systemd-cgtop">
494 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
495 </indexterm>
496 </listitem>
497 </varlistentry>
498
499 <varlistentry id="systemd-delta">
500 <term><command>systemd-delta</command></term>
501 <listitem>
502 <para>Used to identify and compare configuration files in
503 <filename class="directory">/etc</filename> that override default
504 counterparts in <filename class="directory">/usr</filename></para>
505 <indexterm zone="ch-system-systemd systemd-delta">
506 <primary sortas="b-systemd-delta">systemd-delta</primary>
507 </indexterm>
508 </listitem>
509 </varlistentry>
510
511 <varlistentry id="systemd-detect-virt">
512 <term><command>systemd-detect-virt</command></term>
513 <listitem>
514 <para>Detects execution in a virtualized environment</para>
515 <indexterm zone="ch-system-systemd systemd-detect-virt">
516 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
517 </indexterm>
518 </listitem>
519 </varlistentry>
520
521 <varlistentry id="systemd-escape">
522 <term><command>systemd-escape</command></term>
523 <listitem>
524 <para>Used to escape strings for inclusion in systemd unit
525 names</para>
526 <indexterm zone="ch-system-systemd systemd-escape">
527 <primary sortas="b-systemd-escape">systemd-escape</primary>
528 </indexterm>
529 </listitem>
530 </varlistentry>
531
532 <varlistentry id="systemd-hwdb">
533 <term><command>systemd-hwdb</command></term>
534 <listitem>
535 <para>Used to manage hardware database (hwdb)</para>
536 <indexterm zone="ch-system-systemd systemd-hwdb">
537 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
538 </indexterm>
539 </listitem>
540 </varlistentry>
541
542 <varlistentry id="systemd-inhibit">
543 <term><command>systemd-inhibit</command></term>
544 <listitem>
545 <para>Used to execute a program with a shutdown, sleep or idle
546 inhibitor lock taken</para>
547 <indexterm zone="ch-system-systemd systemd-inhibit">
548 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
549 </indexterm>
550 </listitem>
551 </varlistentry>
552
553 <varlistentry id="systemd-machine-id-setup">
554 <term><command>systemd-machine-id-setup</command></term>
555 <listitem>
556 <para>Used by system installer tools to initialize the machine ID
557 stored in <filename>/etc/machine-id</filename> at install time with a
558 randomly generated ID</para>
559 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
560 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
561 </indexterm>
562 </listitem>
563 </varlistentry>
564
565 <varlistentry id="systemd-mount">
566 <term><command>systemd-mount</command></term>
567 <listitem>
568 <para>A tool to temporarily mount or auto-mount a drive.</para>
569 <indexterm zone="ch-system-systemd systemd-mount">
570 <primary sortas="b-systemd-mount">systemd-mount</primary>
571 </indexterm>
572 </listitem>
573 </varlistentry>
574
575 <varlistentry id="systemd-notify">
576 <term><command>systemd-notify</command></term>
577 <listitem>
578 <para>Used by daemon scripts to notify the init system about status
579 changes</para>
580 <indexterm zone="ch-system-systemd systemd-notify">
581 <primary sortas="b-systemd-notify">systemd-notify</primary>
582 </indexterm>
583 </listitem>
584 </varlistentry>
585
586 <varlistentry id="systemd-nspawn">
587 <term><command>systemd-nspawn</command></term>
588 <listitem>
589 <para>Used to run a command or OS in a light-weight namespace
590 container</para>
591 <indexterm zone="ch-system-systemd systemd-nspawn">
592 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
593 </indexterm>
594 </listitem>
595 </varlistentry>
596
597 <varlistentry id="systemd-path">
598 <term><command>systemd-path</command></term>
599 <listitem>
600 <para>Used to query system and user paths</para>
601 <indexterm zone="ch-system-systemd systemd-path">
602 <primary sortas="b-systemd-path">systemd-path</primary>
603 </indexterm>
604 </listitem>
605 </varlistentry>
606
607 <varlistentry id="systemd-resolve">
608 <term><command>systemd-resolve</command></term>
609 <listitem>
610 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
611 resource records, and services</para>
612 <indexterm zone="ch-system-systemd systemd-resolve">
613 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
614 </indexterm>
615 </listitem>
616 </varlistentry>
617
618 <varlistentry id="systemd-run">
619 <term><command>systemd-run</command></term>
620 <listitem>
621 <para>Used to create and start a transient .service or a .scope unit
622 and run the specified command in it</para>
623 <indexterm zone="ch-system-systemd systemd-run">
624 <primary sortas="b-systemd-run">systemd-run</primary>
625 </indexterm>
626 </listitem>
627 </varlistentry>
628
629 <!-- <varlistentry id="systemd-stdio-bridge">
630 <term><command>systemd-stdio-bridge</command></term>
631 <listitem>
632 <para>To be completed</para>
633 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
634 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
635 </indexterm>
636 </listitem>
637 </varlistentry> -->
638
639 <varlistentry id="systemd-socket-activate">
640 <term><command>systemd-socket-activate</command></term>
641 <listitem>
642 <para>A tool to listen on socket devices and launch a process upon
643 connection.</para>
644 <indexterm zone="ch-system-systemd systemd-socket-activate">
645 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
646 </indexterm>
647 </listitem>
648 </varlistentry>
649
650 <varlistentry id="systemd-tmpfiles">
651 <term><command>systemd-tmpfiles</command></term>
652 <listitem>
653 <para>Creates, deletes and cleans up volatile and temporary files and
654 directories, based on the configuration file format and location
655 specified in
656 <filename class="directory">tmpfiles.d</filename> directories</para>
657 <indexterm zone="ch-system-systemd systemd-tmpfiles">
658 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
659 </indexterm>
660 </listitem>
661 </varlistentry>
662
663 <varlistentry id="systemd-tty-ask-password-agent">
664 <term><command>systemd-tty-ask-password-agent</command></term>
665 <listitem>
666 <para>Used to list or process pending systemd password requests</para>
667 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
668 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
669 </indexterm>
670 </listitem>
671 </varlistentry>
672
673 <varlistentry id="telinit">
674 <term><command>telinit</command></term>
675 <listitem>
676 <para>Tells <command>init</command> which run-level to change
677 to</para>
678 <indexterm zone="ch-system-systemd telinit">
679 <primary sortas="b-telinit">telinit</primary>
680 </indexterm>
681 </listitem>
682 </varlistentry>
683
684 <varlistentry id="timedatectl">
685 <term><command>timedatectl</command></term>
686 <listitem>
687 <para>Used to query and change the system clock and its settings
688 </para>
689 <indexterm zone="ch-system-systemd timedatectl">
690 <primary sortas="b-timedatectl">timedatectl</primary>
691 </indexterm>
692 </listitem>
693 </varlistentry>
694
695 <varlistentry id="udevadm">
696 <term><command>udevadm</command></term>
697 <listitem>
698 <para>Generic udev administration tool: controls the udevd daemon,
699 provides info from the Udev database, monitors uevents, waits for
700 uevents to finish, tests udev configuration, and triggers uevents
701 for a given device</para>
702 <indexterm zone="ch-system-systemd udevadm">
703 <primary sortas="b-udevadm">udevadm</primary>
704 </indexterm>
705 </listitem>
706 </varlistentry>
707
708 <varlistentry id="libsystemd">
709 <term><filename class="libraryfile">libsystemd</filename></term>
710 <listitem>
711 <para>The main systemd utility library</para>
712 <indexterm zone="ch-system-systemd libsystemd">
713 <primary sortas="c-libsystemd">libsystemd</primary>
714 </indexterm>
715 </listitem>
716 </varlistentry>
717
718 <varlistentry id="libudev">
719 <term><filename class="libraryfile">libudev</filename></term>
720 <listitem>
721 <para>A library to access Udev device information</para>
722 <indexterm zone="ch-system-systemd libudev">
723 <primary sortas="c-libudev">libudev</primary>
724 </indexterm>
725 </listitem>
726 </varlistentry>
727
728 </variablelist>
729
730 </sect2>
731
732</sect1>
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