source: chapter06/systemd.xml@ 77ab7f3

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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">
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>First, fix a build error when using Util-Linux built in
44 Chapter 5:</para>
45
46<screen><userinput remap="pre">sed -i "s:blkid/::" $(grep -rl "blkid/blkid.h")</userinput></screen>
47
48 <para>Apply the following patch so that compat
49 <command>pkg-config</command> files get installed without installing compat
50 libs which are useless on LFS:</para>
51
52<screen><userinput remap="pre">patch -Np1 -i ../&systemd-compat-patch;</userinput></screen>
53
54 <para>Disable two tests that always fail:</para>
55
56<screen><userinput remap="pre">sed -e 's@test/udev-test.pl @@' \
57 -e 's@test-copy$(EXEEXT) @@' \
58 -i Makefile.in</userinput></screen>
59
60 <para>Rebuild generated files after modifying Makefile.am and
61 Makefile.in:</para>
62
63<screen><userinput remap="pre">autoreconf -fi</userinput></screen>
64
65 <para>Create a file to allow systemd to build when using Util-Linux
66 built in Chapter 5, to disable LTO by default, and to build without
67 xlstproc:</para>
68
69<screen><userinput remap="pre">cat &gt; config.cache &lt;&lt; "EOF"
70<literal>KILL=/bin/kill
71MOUNT_PATH=/bin/mount
72UMOUNT_PATH=/bin/umount
73HAVE_BLKID=1
74BLKID_LIBS="-lblkid"
75BLKID_CFLAGS="-I/tools/include/blkid"
76HAVE_LIBMOUNT=1
77MOUNT_LIBS="-lmount"
78MOUNT_CFLAGS="-I/tools/include/libmount"
79cc_cv_CFLAGS__flto=no
80XSLTPROC="/usr/bin/xsltproc"</literal>
81EOF</userinput></screen>
82
83 <para>LTO is disabled by default because it causes
84 <command>systemd</command> and other auxiliary programs to link to
85 <filename class="libraryfile">libgcc_s.so</filename>, slows the build down
86 and makes the compiled code larger.</para>
87
88 <para>Prepare systemd for compilation:</para>
89
90<screen><userinput remap="configure">./configure --prefix=/usr \
91 --sysconfdir=/etc \
92 --localstatedir=/var \
93 --config-cache \
94 --with-rootprefix= \
95 --with-rootlibdir=/lib \
96 --enable-split-usr \
97 --disable-firstboot \
98 --disable-ldconfig \
99 --disable-sysusers \
100 --without-python \
101 --docdir=/usr/share/doc/systemd-&systemd-version;</userinput></screen>
102
103 <variablelist>
104 <title>The meaning of the configure options:</title>
105
106 <varlistentry>
107 <term><parameter>--config-cache</parameter></term>
108 <listitem>
109 <para>This switch tells the build system to use
110 the <filename>config.cache</filename> file which
111 was created earlier.</para>
112 </listitem>
113 </varlistentry>
114
115 <varlistentry>
116 <term><parameter>--with-root*</parameter></term>
117 <listitem>
118 <para>These switches ensure that core programs and
119 shared libraries are installed in the subdirectories
120 of the root partition.</para>
121 </listitem>
122 </varlistentry>
123
124 <varlistentry>
125 <term><parameter>--enable-split-usr</parameter></term>
126 <listitem>
127 <para>This switch ensures that systemd will work on
128 systems where /bin, /lib and /sbin directories are not
129 symlinks to their /usr counterparts.</para>
130 </listitem>
131 </varlistentry>
132
133 <varlistentry>
134 <term><parameter>--without-python</parameter></term>
135 <listitem>
136 <para>This switch prevents <command>configure</command>
137 from trying to use Python which isn't built
138 in LFS.</para>
139 </listitem>
140 </varlistentry>
141
142 <varlistentry>
143 <term><parameter>--disable-firstboot</parameter></term>
144 <listitem>
145 <para>This switch prevents installation of systemd
146 services responsible for setting up the system for
147 the first time. They are not useful for LFS because
148 everything is done manually.</para>
149 </listitem>
150 </varlistentry>
151
152 <varlistentry>
153 <term><parameter>--disable-ldconfig</parameter></term>
154 <listitem>
155 <para>This switch prevents installation of a systemd
156 unit that runs <command>ldconfig</command> at
157 boot, making the boot time longer. Remove it if the
158 described feature is desired, even though it's not
159 useful for source distributions such as LFS.</para>
160 </listitem>
161 </varlistentry>
162
163 <varlistentry>
164 <term><parameter>--disable-sysusers</parameter></term>
165 <listitem>
166 <para>This switch prevents installation of systemd
167 services responsible for setting up the
168 <filename>/etc/group</filename> and
169 <filename>/etc/passwd</filename> files. Both files
170 were created early in this chapter.</para>
171 </listitem>
172 </varlistentry>
173
174 </variablelist>
175
176 <para>Compile the package:</para>
177
178<screen><userinput remap="make">make LIBRARY_PATH=/tools/lib</userinput></screen>
179
180 <para>This package has a test suite, but it can only be run after the
181 package has been installed.</para>
182
183 <para>Install the package:</para>
184
185<screen><userinput remap="install">make LD_LIBRARY_PATH=/tools/lib install</userinput></screen>
186
187 <para>Move NSS libraries to <filename class="directory">/lib</filename>:</para>
188
189<screen><userinput remap="install">mv -v /usr/lib/libnss_{myhostname,mymachines,resolve}.so.2 /lib</userinput></screen>
190
191 <para>Remove an unnecessary directory:</para>
192
193<screen><userinput remap="install">rm -rfv /usr/lib/rpm</userinput></screen>
194
195 <para>Create the Sysvinit compatibility symlinks, so systemd is used
196 as the default init system:</para>
197
198<screen><userinput remap="install">for tool in runlevel reboot shutdown poweroff halt telinit; do
199 ln -sfv ../bin/systemctl /sbin/${tool}
200done
201ln -sfv ../lib/systemd/systemd /sbin/init</userinput></screen>
202
203<!--
204 <para>Remove a reference to a non-existent group:</para>
205
206<screen><userinput remap="install">sed -i "s:0775 root lock:0755 root root:g" /usr/lib/tmpfiles.d/legacy.conf</userinput></screen>
207-->
208
209 <para>Create the <filename>/etc/machine-id</filename> file needed by
210 <command>systemd-journald</command>:</para>
211
212<screen><userinput remap="install">systemd-machine-id-setup</userinput></screen>
213
214 <para>Since the testsuite largely depends on the host system kernel
215 configuration, some tests may fail. It also needs a modification in
216 order not to look for a program that will be installed by Util-Linux
217 package later in this chapter. To test the results, issue:</para>
218
219<screen><userinput remap="test">sed -i "s:minix:ext4:g" src/test/test-path-util.c
220make LD_LIBRARY_PATH=/tools/lib -k check</userinput></screen>
221
222 </sect2>
223
224 <sect2 id="contents-systemd" role="content">
225 <title>Contents of systemd</title>
226
227 <segmentedlist>
228 <segtitle>Installed programs</segtitle>
229 <segtitle>Installed libraries</segtitle>
230 <segtitle>Installed directories</segtitle>
231
232 <seglistitem>
233 <seg>bootctl, busctl, coredumpctl, halt, hostnamectl, init, journalctl,
234 kernel-install, localectl, loginctl, machinectl, networkctl, poweroff,
235 reboot, runlevel, shutdown, systemctl, systemd-analyze,
236 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
237 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
238 systemd-inhibit, systemd-machine-id-setup, systemd-notify,
239 systemd-nspawn, systemd-path, systemd-resolve, systemd-run,
240 systemd-stdio-bridge, systemd-tmpfiles, systemd-tty-ask-password-agent,
241 telinit, timedatectl, and udevadm</seg>
242 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
243 libnss_resolve.so.2, libsystemd.so, and libudev.so</seg>
244 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
245 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
246 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
247 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
248 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
249 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
250 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
251 </seglistitem>
252 </segmentedlist>
253
254 <variablelist>
255 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
256 <?dbfo list-presentation="list"?>
257 <?dbhtml list-presentation="table"?>
258
259 <varlistentry id="bootctl">
260 <term><command>bootctl</command></term>
261 <listitem>
262 <para>used to query the firmware and boot manager settings</para>
263 <indexterm zone="ch-system-systemd bootctl">
264 <primary sortas="b-bootctl">bootctl</primary>
265 </indexterm>
266 </listitem>
267 </varlistentry>
268
269 <varlistentry id="busctl">
270 <term><command>busctl</command></term>
271 <listitem>
272 <para>Used to introspect and monitor the D-Bus bus</para>
273 <indexterm zone="ch-system-systemd busctl">
274 <primary sortas="b-busctl">busctl</primary>
275 </indexterm>
276 </listitem>
277 </varlistentry>
278
279 <varlistentry id="coredumpctl">
280 <term><command>coredumpctl</command></term>
281 <listitem>
282 <para>Used to retrieve coredumps from the systemd Journal</para>
283 <indexterm zone="ch-system-systemd coredumpctl">
284 <primary sortas="b-coredumpctl">coredumpctl</primary>
285 </indexterm>
286 </listitem>
287 </varlistentry>
288
289 <varlistentry id="halt">
290 <term><command>halt</command></term>
291 <listitem>
292 <para>Normally invokes <command>shutdown</command> with the
293 <parameter>-h</parameter> option, except when already in run-level 0,
294 then it tells the kernel to halt the system; it notes in the
295 file <filename>/var/log/wtmp</filename> that the system is being
296 brought down</para>
297 <indexterm zone="ch-system-systemd halt">
298 <primary sortas="b-halt">halt</primary>
299 </indexterm>
300 </listitem>
301 </varlistentry>
302
303 <varlistentry id="hostnamectl">
304 <term><command>hostnamectl</command></term>
305 <listitem>
306 <para>Used to query and change the system hostname and related
307 settings</para>
308 <indexterm zone="ch-system-systemd hostnamectl">
309 <primary sortas="b-hostnamectl">hostnamectl</primary>
310 </indexterm>
311 </listitem>
312 </varlistentry>
313
314 <varlistentry id="init">
315 <term><command>init</command></term>
316 <listitem>
317 <para>The first process to be started when the kernel has initialized
318 the hardware which takes over the boot process and starts all the
319 proceses it is instructed to</para>
320 <indexterm zone="ch-system-systemd init">
321 <primary sortas="b-init">init</primary>
322 </indexterm>
323 </listitem>
324 </varlistentry>
325
326 <varlistentry id="journalctl">
327 <term><command>journalctl</command></term>
328 <listitem>
329 <para>Used to query the contents of the systemd Journal</para>
330 <indexterm zone="ch-system-systemd journalctl">
331 <primary sortas="b-journalctl">journalctl</primary>
332 </indexterm>
333 </listitem>
334 </varlistentry>
335
336 <varlistentry id="kernel-install">
337 <term><command>kernel-install</command></term>
338 <listitem>
339 <para>Used to add and remove kernel and initramfs images to and
340 from /boot</para>
341 <indexterm zone="ch-system-systemd kernel-install">
342 <primary sortas="b-kernel-install">kernel-install</primary>
343 </indexterm>
344 </listitem>
345 </varlistentry>
346
347 <varlistentry id="localectl">
348 <term><command>localectl</command></term>
349 <listitem>
350 <para>Used to query and change the system locale and keyboard layout
351 settings</para>
352 <indexterm zone="ch-system-systemd localectl">
353 <primary sortas="b-localectl">localectl</primary>
354 </indexterm>
355 </listitem>
356 </varlistentry>
357
358 <varlistentry id="loginctl">
359 <term><command>loginctl</command></term>
360 <listitem>
361 <para>Used to introspect and control the state of the systemd Login
362 Manager</para>
363 <indexterm zone="ch-system-systemd loginctl">
364 <primary sortas="b-loginctl">loginctl</primary>
365 </indexterm>
366 </listitem>
367 </varlistentry>
368
369 <varlistentry id="machinectl">
370 <term><command>machinectl</command></term>
371 <listitem>
372 <para>Used to introspect and control the state of the systemd Virtual
373 Machine and Container Registration Manager</para>
374 <indexterm zone="ch-system-systemd machinectl">
375 <primary sortas="b-machinectl">machinectl</primary>
376 </indexterm>
377 </listitem>
378 </varlistentry>
379
380 <varlistentry id="networkctl">
381 <term><command>networkctl</command></term>
382 <listitem>
383 <para>Used to introspect the state of the network links as seen by
384 systemd-networkd</para>
385 <indexterm zone="ch-system-systemd networkctl">
386 <primary sortas="b-networkctl">networkctl</primary>
387 </indexterm>
388 </listitem>
389 </varlistentry>
390
391 <varlistentry id="poweroff">
392 <term><command>poweroff</command></term>
393 <listitem>
394 <para>Tells the kernel to halt the system and switch off the computer
395 (see <command>halt</command>)</para>
396 <indexterm zone="ch-system-systemd poweroff">
397 <primary sortas="b-poweroff">poweroff</primary>
398 </indexterm>
399 </listitem>
400 </varlistentry>
401
402 <varlistentry id="reboot">
403 <term><command>reboot</command></term>
404 <listitem>
405 <para>Tells the kernel to reboot the system (see
406 <command>halt</command>)</para>
407 <indexterm zone="ch-system-systemd reboot">
408 <primary sortas="b-reboot">reboot</primary>
409 </indexterm>
410 </listitem>
411 </varlistentry>
412
413 <varlistentry id="runlevel">
414 <term><command>runlevel</command></term>
415 <listitem>
416 <para>Reports the previous and the current run-level, as noted in the
417 last run-level record in <filename>/var/run/utmp</filename></para>
418 <indexterm zone="ch-system-systemd runlevel">
419 <primary sortas="b-runlevel">runlevel</primary>
420 </indexterm>
421 </listitem>
422 </varlistentry>
423
424 <varlistentry id="shutdown">
425 <term><command>shutdown</command></term>
426 <listitem>
427 <para>Brings the system down in a secure way, signaling all processes
428 and notifying all logged-in users</para>
429 <indexterm zone="ch-system-systemd shutdown">
430 <primary sortas="b-shutdown">shutdown</primary>
431 </indexterm>
432 </listitem>
433 </varlistentry>
434
435 <varlistentry id="systemctl">
436 <term><command>systemctl</command></term>
437 <listitem>
438 <para>Used to introspect and control the state of the systemd system
439 and service manager</para>
440 <indexterm zone="ch-system-systemd systemctl">
441 <primary sortas="b-systemctl">systemctl</primary>
442 </indexterm>
443 </listitem>
444 </varlistentry>
445
446 <varlistentry id="systemd-analyze">
447 <term><command>systemd-analyze</command></term>
448 <listitem>
449 <para>Used to determine system boot-up performance of the current
450 boot</para>
451 <indexterm zone="ch-system-systemd systemd-analyze">
452 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
453 </indexterm>
454 </listitem>
455 </varlistentry>
456
457 <varlistentry id="systemd-ask-password">
458 <term><command>systemd-ask-password</command></term>
459 <listitem>
460 <para>Used to query a system password or passphrase from the user,
461 using a question message specified on the command line</para>
462 <indexterm zone="ch-system-systemd systemd-ask-password">
463 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
464 </indexterm>
465 </listitem>
466 </varlistentry>
467
468 <varlistentry id="systemd-cat">
469 <term><command>systemd-cat</command></term>
470 <listitem>
471 <para>Used to connect STDOUT and STDERR of a process with the Journal
472 </para>
473 <indexterm zone="ch-system-systemd systemd-cat">
474 <primary sortas="b-systemd-cat">systemd-cat</primary>
475 </indexterm>
476 </listitem>
477 </varlistentry>
478
479 <varlistentry id="systemd-cgls">
480 <term><command>systemd-cgls</command></term>
481 <listitem>
482 <para>Recursively shows the contents of the selected Linux control
483 group hierarchy in a tree</para>
484 <indexterm zone="ch-system-systemd systemd-cgls">
485 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
486 </indexterm>
487 </listitem>
488 </varlistentry>
489
490 <varlistentry id="systemd-cgtop">
491 <term><command>systemd-cgtop</command></term>
492 <listitem>
493 <para>Shows the top control groups of the local Linux control group
494 hierarchy, ordered by their CPU, memory and disk I/O load</para>
495 <indexterm zone="ch-system-systemd systemd-cgtop">
496 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
497 </indexterm>
498 </listitem>
499 </varlistentry>
500
501 <varlistentry id="systemd-delta">
502 <term><command>systemd-delta</command></term>
503 <listitem>
504 <para>Used to identify and compare configuration files in
505 <filename class="directory">/etc</filename> that override default
506 counterparts in <filename class="directory">/usr</filename></para>
507 <indexterm zone="ch-system-systemd systemd-delta">
508 <primary sortas="b-systemd-delta">systemd-delta</primary>
509 </indexterm>
510 </listitem>
511 </varlistentry>
512
513 <varlistentry id="systemd-detect-virt">
514 <term><command>systemd-detect-virt</command></term>
515 <listitem>
516 <para>Detects execution in a virtualized environment</para>
517 <indexterm zone="ch-system-systemd systemd-detect-virt">
518 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
519 </indexterm>
520 </listitem>
521 </varlistentry>
522
523 <varlistentry id="systemd-escape">
524 <term><command>systemd-escape</command></term>
525 <listitem>
526 <para>Used to escape strings for inclusion in systemd unit
527 names</para>
528 <indexterm zone="ch-system-systemd systemd-escape">
529 <primary sortas="b-systemd-escape">systemd-escape</primary>
530 </indexterm>
531 </listitem>
532 </varlistentry>
533
534 <varlistentry id="systemd-hwdb">
535 <term><command>systemd-hwdb</command></term>
536 <listitem>
537 <para>Used to manage hardware database (hwdb)</para>
538 <indexterm zone="ch-system-systemd systemd-hwdb">
539 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
540 </indexterm>
541 </listitem>
542 </varlistentry>
543
544 <varlistentry id="systemd-inhibit">
545 <term><command>systemd-inhibit</command></term>
546 <listitem>
547 <para>Used to execute a program with a shutdown, sleep or idle
548 inhibitor lock taken</para>
549 <indexterm zone="ch-system-systemd systemd-inhibit">
550 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
551 </indexterm>
552 </listitem>
553 </varlistentry>
554
555 <varlistentry id="systemd-machine-id-setup">
556 <term><command>systemd-machine-id-setup</command></term>
557 <listitem>
558 <para>Used by system installer tools to initialize the machine ID
559 stored in <filename>/etc/machine-id</filename> at install time with a
560 randomly generated ID</para>
561 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
562 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
563 </indexterm>
564 </listitem>
565 </varlistentry>
566
567 <varlistentry id="systemd-notify">
568 <term><command>systemd-notify</command></term>
569 <listitem>
570 <para>Used by daemon scripts to notify the init system about status
571 changes</para>
572 <indexterm zone="ch-system-systemd systemd-notify">
573 <primary sortas="b-systemd-notify">systemd-notify</primary>
574 </indexterm>
575 </listitem>
576 </varlistentry>
577
578 <varlistentry id="systemd-nspawn">
579 <term><command>systemd-nspawn</command></term>
580 <listitem>
581 <para>Used to run a command or OS in a light-weight namespace
582 container</para>
583 <indexterm zone="ch-system-systemd systemd-nspawn">
584 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
585 </indexterm>
586 </listitem>
587 </varlistentry>
588
589 <varlistentry id="systemd-path">
590 <term><command>systemd-path</command></term>
591 <listitem>
592 <para>Used to query system and user paths</para>
593 <indexterm zone="ch-system-systemd systemd-path">
594 <primary sortas="b-systemd-path">systemd-path</primary>
595 </indexterm>
596 </listitem>
597 </varlistentry>
598
599 <varlistentry id="systemd-resolve">
600 <term><command>systemd-resolve</command></term>
601 <listitem>
602 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
603 resource records, and services</para>
604 <indexterm zone="ch-system-systemd systemd-resolve">
605 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
606 </indexterm>
607 </listitem>
608 </varlistentry>
609
610 <varlistentry id="systemd-run">
611 <term><command>systemd-run</command></term>
612 <listitem>
613 <para>Used to create and start a transient .service or a .scope unit
614 and run the specified command in it</para>
615 <indexterm zone="ch-system-systemd systemd-run">
616 <primary sortas="b-systemd-run">systemd-run</primary>
617 </indexterm>
618 </listitem>
619 </varlistentry>
620
621 <!-- <varlistentry id="systemd-stdio-bridge">
622 <term><command>systemd-stdio-bridge</command></term>
623 <listitem>
624 <para>To be completed</para>
625 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
626 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
627 </indexterm>
628 </listitem>
629 </varlistentry> -->
630
631 <varlistentry id="systemd-tmpfiles">
632 <term><command>systemd-tmpfiles</command></term>
633 <listitem>
634 <para>Creates, deletes and cleans up volatile and temporary files and
635 directories, based on the configuration file format and location
636 specified in
637 <filename class="directory">tmpfiles.d</filename> directories</para>
638 <indexterm zone="ch-system-systemd systemd-tmpfiles">
639 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
640 </indexterm>
641 </listitem>
642 </varlistentry>
643
644 <varlistentry id="systemd-tty-ask-password-agent">
645 <term><command>systemd-tty-ask-password-agent</command></term>
646 <listitem>
647 <para>Used to list or process pending systemd password requests</para>
648 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
649 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
650 </indexterm>
651 </listitem>
652 </varlistentry>
653
654 <varlistentry id="telinit">
655 <term><command>telinit</command></term>
656 <listitem>
657 <para>Tells <command>init</command> which run-level to change
658 to</para>
659 <indexterm zone="ch-system-systemd telinit">
660 <primary sortas="b-telinit">telinit</primary>
661 </indexterm>
662 </listitem>
663 </varlistentry>
664
665 <varlistentry id="timedatectl">
666 <term><command>timedatectl</command></term>
667 <listitem>
668 <para>Used to query and change the system clock and its settings
669 </para>
670 <indexterm zone="ch-system-systemd timedatectl">
671 <primary sortas="b-timedatectl">timedatectl</primary>
672 </indexterm>
673 </listitem>
674 </varlistentry>
675
676 <varlistentry id="udevadm">
677 <term><command>udevadm</command></term>
678 <listitem>
679 <para>Generic Udev administration tool: controls the udevd daemon,
680 provides info from the Udev database, monitors uevents, waits for
681 uevents to finish, tests Udev configuration, and triggers uevents
682 for a given device</para>
683 <indexterm zone="ch-system-systemd udevadm">
684 <primary sortas="b-udevadm">udevadm</primary>
685 </indexterm>
686 </listitem>
687 </varlistentry>
688
689 <varlistentry id="libsystemd">
690 <term><filename class="libraryfile">libsystemd</filename></term>
691 <listitem>
692 <para>systemd utility library</para>
693 <indexterm zone="ch-system-systemd libsystemd">
694 <primary sortas="c-libsystemd">libsystemd</primary>
695 </indexterm>
696 </listitem>
697 </varlistentry>
698
699 <varlistentry id="libudev">
700 <term><filename class="libraryfile">libudev</filename></term>
701 <listitem>
702 <para>A library to access Udev device information</para>
703 <indexterm zone="ch-system-systemd libudev">
704 <primary sortas="c-libudev">libudev</primary>
705 </indexterm>
706 </listitem>
707 </varlistentry>
708
709 </variablelist>
710
711 </sect2>
712
713</sect1>
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