source: chapter06/systemd.xml@ 6e13139

7.9-systemd
Last change on this file since 6e13139 was 131c907, checked in by DJ Lucas <dj@…>, 8 years ago

Sync with trunk r10891, update to udev-1.10.6, update to systemd-228.

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/branches/systemd@10982 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">
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, create a file to allow systemd to build when using Util-Linux
44 built in Chapter 5, to disable LTO by default, and to build without
45 xlstproc:</para>
46
47<screen><userinput remap="pre">cat &gt; config.cache &lt;&lt; "EOF"
48<literal>KILL=/bin/kill
49MOUNT_PATH=/bin/mount
50UMOUNT_PATH=/bin/umount
51HAVE_BLKID=1
52BLKID_LIBS="-lblkid"
53BLKID_CFLAGS="-I/tools/include/blkid"
54HAVE_LIBMOUNT=1
55MOUNT_LIBS="-lmount"
56MOUNT_CFLAGS="-I/tools/include/libmount"
57cc_cv_CFLAGS__flto=no
58XSLTPROC="/usr/bin/xsltproc"</literal>
59EOF</userinput></screen>
60
61 <para>LTO is disabled by default because it causes <command>systemd</command>
62 and other auxiliary programs to link to <filename
63 class="libraryfile">libgcc_s.so</filename>, slows the build down and makes the
64 compiled code larger.</para>
65
66 <para>Additionally, fix a build error when using Util-Linux built in
67 Chapter 5:</para>
68
69<screen><userinput remap="pre">sed -i "s:blkid/::" $(grep -rl "blkid/blkid.h")</userinput></screen>
70
71 <para>Apply the following patch so that compat <command>pkg-config</command> files
72 get installed without installing compat libs which are useless on LFS:</para>
73
74<screen><userinput remap="pre">patch -Np1 -i ../&systemd-compat-patch;</userinput></screen>
75
76 <para>Disable two tests that always fail:</para>
77
78<screen><userinput remap="pre">sed -e 's:test/udev-test.pl ::g' \
79 -e 's:test-copy$(EXEEXT) ::g' \
80 -i Makefile.in</userinput></screen>
81
82 <para>Prepare systemd for compilation:</para>
83
84<screen><userinput remap="configure">./configure --prefix=/usr \
85 --sysconfdir=/etc \
86 --localstatedir=/var \
87 --config-cache \
88 --with-rootprefix= \
89 --with-rootlibdir=/lib \
90 --enable-split-usr \
91 --disable-firstboot \
92 --disable-ldconfig \
93 --disable-sysusers \
94 --without-python \
95 --docdir=/usr/share/doc/systemd-&systemd-version; \
96 --with-dbuspolicydir=/etc/dbus-1/system.d \
97 --with-dbussessionservicedir=/usr/share/dbus-1/services \
98 --with-dbussystemservicedir=/usr/share/dbus-1/system-services</userinput></screen>
99
100 <variablelist>
101 <title>The meaning of the configure options:</title>
102
103 <varlistentry>
104 <term><parameter>--config-cache</parameter></term>
105 <listitem>
106 <para>This switch tells the build system to use
107 the <filename>config.cache</filename> file which
108 was created earlier.</para>
109 </listitem>
110 </varlistentry>
111
112 <varlistentry>
113 <term><parameter>--with-root*</parameter></term>
114 <listitem>
115 <para>These switches ensure that core programs and
116 shared libraries are installed in the subdirectories
117 of the root partition.</para>
118 </listitem>
119 </varlistentry>
120
121 <varlistentry>
122 <term><parameter>--enable-split-usr</parameter></term>
123 <listitem>
124 <para>This switch ensures that systemd will work on
125 systems where /bin, /lib and /sbin directories are not
126 symlinks to their /usr counterparts.</para>
127 </listitem>
128 </varlistentry>
129
130 <varlistentry>
131 <term><parameter>--without-python</parameter></term>
132 <listitem>
133 <para>This switch prevents <command>configure</command>
134 from trying to use Python which isn't built
135 in LFS.</para>
136 </listitem>
137 </varlistentry>
138
139 <varlistentry>
140 <term><parameter>--disable-firstboot</parameter></term>
141 <listitem>
142 <para>This switch prevents installation of systemd
143 services responsible for setting up the system for
144 the first time. They are not useful for LFS because
145 everything is done manually.</para>
146 </listitem>
147 </varlistentry>
148
149 <varlistentry>
150 <term><parameter>--disable-ldconfig</parameter></term>
151 <listitem>
152 <para>This switch prevents installation of a systemd
153 unit that runs <command>ldconfig</command> at
154 boot, making the boot time longer. Remove it if the
155 described feature is desired, even though it's not
156 useful for source distributions such as LFS.</para>
157 </listitem>
158 </varlistentry>
159
160 <varlistentry>
161 <term><parameter>--disable-sysusers</parameter></term>
162 <listitem>
163 <para>This switch prevents installation of systemd
164 services responsible for setting up the
165 <filename>/etc/group</filename> and
166 <filename>/etc/passwd</filename> files. Both files
167 were created early in this chapter.</para>
168 </listitem>
169 </varlistentry>
170
171 <varlistentry>
172 <term><parameter>--with-dbus*</parameter></term>
173 <listitem>
174 <para>These switches ensure that D-Bus configuration files
175 get installed in the correct locations.</para>
176 </listitem>
177 </varlistentry>
178
179 </variablelist>
180
181 <para>Compile the package:</para>
182
183<screen><userinput remap="make">make LIBRARY_PATH=/tools/lib</userinput></screen>
184
185 <para>This package has a test suite, but it can only be run after the
186 package has been installed.</para>
187
188 <para>Install the package:</para>
189
190<screen><userinput remap="install">make LD_LIBRARY_PATH=/tools/lib install</userinput></screen>
191
192 <para>Move NSS libraries to <filename class="directory">/lib</filename>:</para>
193
194<screen><userinput remap="install">mv -v /usr/lib/libnss_{myhostname,mymachines,resolve}.so.2 /lib</userinput></screen>
195
196 <para>Remove an unnecessary directory:</para>
197
198<screen><userinput remap="install">rm -rfv /usr/lib/rpm</userinput></screen>
199
200 <para>Create the Sysvinit compatibility symlinks, so systemd is used
201 as the default init system:</para>
202
203<screen><userinput remap="install">for tool in runlevel reboot shutdown poweroff halt telinit; do
204 ln -sfv ../bin/systemctl /sbin/${tool}
205done
206ln -sfv ../lib/systemd/systemd /sbin/init</userinput></screen>
207
208 <para>Remove a reference to a non-existent group:</para>
209
210<screen><userinput remap="install">sed -i "s:0775 root lock:0755 root root:g" /usr/lib/tmpfiles.d/legacy.conf</userinput></screen>
211
212 <para>Create the <filename>/etc/machine-id</filename> file needed by
213 <command>systemd-journald</command>:</para>
214
215<screen><userinput remap="install">systemd-machine-id-setup</userinput></screen>
216
217 <para>Since the testsuite largely depends on the host system kernel
218 configuration, some tests may fail. It also needs a modification in
219 order not to look for a program that will be installed by Util-Linux
220 package later in this chapter. To test the results, issue:</para>
221
222<screen><userinput remap="test">sed -i "s:minix:ext4:g" src/test/test-path-util.c
223make LD_LIBRARY_PATH=/tools/lib -k check</userinput></screen>
224
225 </sect2>
226
227 <sect2 id="contents-systemd" role="content">
228 <title>Contents of systemd</title>
229
230 <segmentedlist>
231 <segtitle>Installed programs</segtitle>
232 <segtitle>Installed libraries</segtitle>
233 <segtitle>Installed directories</segtitle>
234
235 <seglistitem>
236 <seg>bootctl, busctl, coredumpctl, halt, hostnamectl, init, journalctl,
237 kernel-install, localectl, loginctl, machinectl, networkctl, poweroff,
238 reboot, runlevel, shutdown, systemctl, systemd-analyze,
239 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
240 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
241 systemd-inhibit, systemd-machine-id-setup, systemd-notify, systemd-nspawn,
242 systemd-path, systemd-run, systemd-stdio-bridge, systemd-tmpfiles,
243 systemd-tty-ask-password-agent, telinit, timedatectl, and udevadm</seg>
244 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2, libnss_resolve.so.2,
245 libsystemd.so, and libudev.so</seg>
246 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
247 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
248 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
249 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
250 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
251 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
252 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
253 </seglistitem>
254 </segmentedlist>
255
256 <variablelist>
257 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
258 <?dbfo list-presentation="list"?>
259 <?dbhtml list-presentation="table"?>
260
261 <varlistentry id="bootctl">
262 <term><command>bootctl</command></term>
263 <listitem>
264 <para>used to query the firmware and boot manager settings</para>
265 <indexterm zone="ch-system-systemd bootctl">
266 <primary sortas="b-bootctl">bootctl</primary>
267 </indexterm>
268 </listitem>
269 </varlistentry>
270
271 <varlistentry id="busctl">
272 <term><command>busctl</command></term>
273 <listitem>
274 <para>Used to introspect and monitor the D-Bus bus</para>
275 <indexterm zone="ch-system-systemd busctl">
276 <primary sortas="b-busctl">busctl</primary>
277 </indexterm>
278 </listitem>
279 </varlistentry>
280
281 <varlistentry id="coredumpctl">
282 <term><command>coredumpctl</command></term>
283 <listitem>
284 <para>Used to retrieve coredumps from the systemd Journal</para>
285 <indexterm zone="ch-system-systemd coredumpctl">
286 <primary sortas="b-coredumpctl">coredumpctl</primary>
287 </indexterm>
288 </listitem>
289 </varlistentry>
290
291 <varlistentry id="halt">
292 <term><command>halt</command></term>
293 <listitem>
294 <para>Normally invokes <command>shutdown</command> with the
295 <parameter>-h</parameter> option, except when already in run-level 0,
296 then it tells the kernel to halt the system; it notes in the
297 file <filename>/var/log/wtmp</filename> that the system is being
298 brought down</para>
299 <indexterm zone="ch-system-systemd halt">
300 <primary sortas="b-halt">halt</primary>
301 </indexterm>
302 </listitem>
303 </varlistentry>
304
305 <varlistentry id="hostnamectl">
306 <term><command>hostnamectl</command></term>
307 <listitem>
308 <para>Used to query and change the system hostname and related
309 settings</para>
310 <indexterm zone="ch-system-systemd hostnamectl">
311 <primary sortas="b-hostnamectl">hostnamectl</primary>
312 </indexterm>
313 </listitem>
314 </varlistentry>
315
316 <varlistentry id="init">
317 <term><command>init</command></term>
318 <listitem>
319 <para>The first process to be started when the kernel has initialized
320 the hardware which takes over the boot process and starts all the
321 proceses it is instructed to</para>
322 <indexterm zone="ch-system-systemd init">
323 <primary sortas="b-init">init</primary>
324 </indexterm>
325 </listitem>
326 </varlistentry>
327
328 <varlistentry id="journalctl">
329 <term><command>journalctl</command></term>
330 <listitem>
331 <para>Used to query the contents of the systemd Journal</para>
332 <indexterm zone="ch-system-systemd journalctl">
333 <primary sortas="b-journalctl">journalctl</primary>
334 </indexterm>
335 </listitem>
336 </varlistentry>
337
338 <varlistentry id="kernel-install">
339 <term><command>kernel-install</command></term>
340 <listitem>
341 <para>Used to add and remove kernel and initramfs images to and
342 from /boot</para>
343 <indexterm zone="ch-system-systemd kernel-install">
344 <primary sortas="b-kernel-install">kernel-install</primary>
345 </indexterm>
346 </listitem>
347 </varlistentry>
348
349 <varlistentry id="localectl">
350 <term><command>localectl</command></term>
351 <listitem>
352 <para>Used to query and change the system locale and keyboard layout
353 settings</para>
354 <indexterm zone="ch-system-systemd localectl">
355 <primary sortas="b-localectl">localectl</primary>
356 </indexterm>
357 </listitem>
358 </varlistentry>
359
360 <varlistentry id="loginctl">
361 <term><command>loginctl</command></term>
362 <listitem>
363 <para>Used to introspect and control the state of the systemd Login
364 Manager</para>
365 <indexterm zone="ch-system-systemd loginctl">
366 <primary sortas="b-loginctl">loginctl</primary>
367 </indexterm>
368 </listitem>
369 </varlistentry>
370
371 <varlistentry id="machinectl">
372 <term><command>machinectl</command></term>
373 <listitem>
374 <para>Used to introspect and control the state of the systemd Virtual
375 Machine and Container Registration Manager</para>
376 <indexterm zone="ch-system-systemd machinectl">
377 <primary sortas="b-machinectl">machinectl</primary>
378 </indexterm>
379 </listitem>
380 </varlistentry>
381
382 <varlistentry id="networkctl">
383 <term><command>networkctl</command></term>
384 <listitem>
385 <para>Used to introspect the state of the network links as seen by
386 systemd-networkd</para>
387 <indexterm zone="ch-system-systemd networkctl">
388 <primary sortas="b-networkctl">networkctl</primary>
389 </indexterm>
390 </listitem>
391 </varlistentry>
392
393 <varlistentry id="poweroff">
394 <term><command>poweroff</command></term>
395 <listitem>
396 <para>Tells the kernel to halt the system and switch off the computer
397 (see <command>halt</command>)</para>
398 <indexterm zone="ch-system-systemd poweroff">
399 <primary sortas="b-poweroff">poweroff</primary>
400 </indexterm>
401 </listitem>
402 </varlistentry>
403
404 <varlistentry id="reboot">
405 <term><command>reboot</command></term>
406 <listitem>
407 <para>Tells the kernel to reboot the system (see
408 <command>halt</command>)</para>
409 <indexterm zone="ch-system-systemd reboot">
410 <primary sortas="b-reboot">reboot</primary>
411 </indexterm>
412 </listitem>
413 </varlistentry>
414
415 <varlistentry id="runlevel">
416 <term><command>runlevel</command></term>
417 <listitem>
418 <para>Reports the previous and the current run-level, as noted in the
419 last run-level record in <filename>/var/run/utmp</filename></para>
420 <indexterm zone="ch-system-systemd runlevel">
421 <primary sortas="b-runlevel">runlevel</primary>
422 </indexterm>
423 </listitem>
424 </varlistentry>
425
426 <varlistentry id="shutdown">
427 <term><command>shutdown</command></term>
428 <listitem>
429 <para>Brings the system down in a secure way, signaling all processes
430 and notifying all logged-in users</para>
431 <indexterm zone="ch-system-systemd shutdown">
432 <primary sortas="b-shutdown">shutdown</primary>
433 </indexterm>
434 </listitem>
435 </varlistentry>
436
437 <varlistentry id="systemctl">
438 <term><command>systemctl</command></term>
439 <listitem>
440 <para>Used to introspect and control the state of the systemd system and
441 service manager</para>
442 <indexterm zone="ch-system-systemd systemctl">
443 <primary sortas="b-systemctl">systemctl</primary>
444 </indexterm>
445 </listitem>
446 </varlistentry>
447
448 <varlistentry id="systemd-analyze">
449 <term><command>systemd-analyze</command></term>
450 <listitem>
451 <para>Used to determine system boot-up performance of the current boot
452 </para>
453 <indexterm zone="ch-system-systemd systemd-analyze">
454 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
455 </indexterm>
456 </listitem>
457 </varlistentry>
458
459 <varlistentry id="systemd-ask-password">
460 <term><command>systemd-ask-password</command></term>
461 <listitem>
462 <para>Used to query a system password or passphrase from the user, using a
463 question message specified on the command line</para>
464 <indexterm zone="ch-system-systemd systemd-ask-password">
465 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
466 </indexterm>
467 </listitem>
468 </varlistentry>
469
470 <varlistentry id="systemd-cat">
471 <term><command>systemd-cat</command></term>
472 <listitem>
473 <para>Used to connect STDOUT and STDERR of a process with the Journal
474 </para>
475 <indexterm zone="ch-system-systemd systemd-cat">
476 <primary sortas="b-systemd-cat">systemd-cat</primary>
477 </indexterm>
478 </listitem>
479 </varlistentry>
480
481 <varlistentry id="systemd-cgls">
482 <term><command>systemd-cgls</command></term>
483 <listitem>
484 <para>Recursively shows the contents of the selected Linux control group
485 hierarchy in a tree</para>
486 <indexterm zone="ch-system-systemd systemd-cgls">
487 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
488 </indexterm>
489 </listitem>
490 </varlistentry>
491
492 <varlistentry id="systemd-cgtop">
493 <term><command>systemd-cgtop</command></term>
494 <listitem>
495 <para>Shows the top control groups of the local Linux control group hierarchy,
496 ordered by their CPU, memory and disk I/O load</para>
497 <indexterm zone="ch-system-systemd systemd-cgtop">
498 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
499 </indexterm>
500 </listitem>
501 </varlistentry>
502
503 <varlistentry id="systemd-delta">
504 <term><command>systemd-delta</command></term>
505 <listitem>
506 <para>Used to identify and compare configuration files in
507 <filename class="directory">/etc</filename> that override default
508 counterparts in <filename class="directory">/usr</filename></para>
509 <indexterm zone="ch-system-systemd systemd-delta">
510 <primary sortas="b-systemd-delta">systemd-delta</primary>
511 </indexterm>
512 </listitem>
513 </varlistentry>
514
515 <varlistentry id="systemd-detect-virt">
516 <term><command>systemd-detect-virt</command></term>
517 <listitem>
518 <para>Detects execution in a virtualized environment</para>
519 <indexterm zone="ch-system-systemd systemd-detect-virt">
520 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
521 </indexterm>
522 </listitem>
523 </varlistentry>
524
525 <varlistentry id="systemd-escape">
526 <term><command>systemd-escape</command></term>
527 <listitem>
528 <para>Used to escape strings for inclusion in systemd unit names</para>
529 <indexterm zone="ch-system-systemd systemd-escape">
530 <primary sortas="b-systemd-escape">systemd-escape</primary>
531 </indexterm>
532 </listitem>
533 </varlistentry>
534
535 <varlistentry id="systemd-hwdb">
536 <term><command>systemd-hwdb</command></term>
537 <listitem>
538 <para>Used to manage hardware database (hwdb)</para>
539 <indexterm zone="ch-system-systemd systemd-hwdb">
540 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
541 </indexterm>
542 </listitem>
543 </varlistentry>
544
545 <varlistentry id="systemd-inhibit">
546 <term><command>systemd-inhibit</command></term>
547 <listitem>
548 <para>Used to execute a program with a shutdown, sleep or idle inhibitor lock
549 taken</para>
550 <indexterm zone="ch-system-systemd systemd-inhibit">
551 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
552 </indexterm>
553 </listitem>
554 </varlistentry>
555
556 <varlistentry id="systemd-machine-id-setup">
557 <term><command>systemd-machine-id-setup</command></term>
558 <listitem>
559 <para>Used by system installer tools to initialize the machine ID stored in
560 <filename>/etc/machine-id</filename> at install time with a randomly
561 generated ID</para>
562 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
563 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</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 changes
572 </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 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-run">
600 <term><command>systemd-run</command></term>
601 <listitem>
602 <para>Used to create and start a transient .service or a .scope unit and
603 run the specified command in it</para>
604 <indexterm zone="ch-system-systemd systemd-run">
605 <primary sortas="b-systemd-run">systemd-run</primary>
606 </indexterm>
607 </listitem>
608 </varlistentry>
609
610 <!-- <varlistentry id="systemd-stdio-bridge">
611 <term><command>systemd-stdio-bridge</command></term>
612 <listitem>
613 <para>To be completed</para>
614 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
615 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
616 </indexterm>
617 </listitem>
618 </varlistentry> -->
619
620 <varlistentry id="systemd-tmpfiles">
621 <term><command>systemd-tmpfiles</command></term>
622 <listitem>
623 <para>Creates, deletes and cleans up volatile and temporary files and directories,
624 based on the configuration file format and location specified in
625 <filename class="directory">tmpfiles.d</filename> directories</para>
626 <indexterm zone="ch-system-systemd systemd-tmpfiles">
627 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
628 </indexterm>
629 </listitem>
630 </varlistentry>
631
632 <varlistentry id="systemd-tty-ask-password-agent">
633 <term><command>systemd-tty-ask-password-agent</command></term>
634 <listitem>
635 <para>Used to list or process pending systemd password requests</para>
636 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
637 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
638 </indexterm>
639 </listitem>
640 </varlistentry>
641
642 <varlistentry id="telinit">
643 <term><command>telinit</command></term>
644 <listitem>
645 <para>Tells <command>init</command> which run-level to change to</para>
646 <indexterm zone="ch-system-systemd telinit">
647 <primary sortas="b-telinit">telinit</primary>
648 </indexterm>
649 </listitem>
650 </varlistentry>
651
652 <varlistentry id="timedatectl">
653 <term><command>timedatectl</command></term>
654 <listitem>
655 <para>Used to query and change the system clock and its settings
656 </para>
657 <indexterm zone="ch-system-systemd timedatectl">
658 <primary sortas="b-timedatectl">timedatectl</primary>
659 </indexterm>
660 </listitem>
661 </varlistentry>
662
663 <varlistentry id="udevadm">
664 <term><command>udevadm</command></term>
665 <listitem>
666 <para>Generic Udev administration tool: controls the udevd daemon,
667 provides info from the Udev database, monitors uevents, waits for
668 uevents to finish, tests Udev configuration, and triggers uevents
669 for a given device</para>
670 <indexterm zone="ch-system-systemd udevadm">
671 <primary sortas="b-udevadm">udevadm</primary>
672 </indexterm>
673 </listitem>
674 </varlistentry>
675
676 <varlistentry id="libsystemd">
677 <term><filename class="libraryfile">libsystemd</filename></term>
678 <listitem>
679 <para>systemd utility library</para>
680 <indexterm zone="ch-system-systemd libsystemd">
681 <primary sortas="c-libsystemd">libsystemd</primary>
682 </indexterm>
683 </listitem>
684 </varlistentry>
685
686 <varlistentry id="libudev">
687 <term><filename class="libraryfile">libudev</filename></term>
688 <listitem>
689 <para>A library to access Udev device information</para>
690 <indexterm zone="ch-system-systemd libudev">
691 <primary sortas="c-libudev">libudev</primary>
692 </indexterm>
693 </listitem>
694 </varlistentry>
695
696 </variablelist>
697
698 </sect2>
699
700</sect1>
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