source: chapter06/systemd.xml@ f202da3b

7.7-systemd 7.8-systemd 7.9-systemd
Last change on this file since f202da3b was f202da3b, checked in by Krejzi <krejzi@…>, 9 years ago

Fix systemd-tmpfiles. Thanks to spiky for the report.

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/branches/systemd@10857 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 and disable LTO by default:</para>
45
46<screen><userinput remap="pre">cat &gt; config.cache &lt;&lt; "EOF"
47<literal>KILL=/bin/kill
48HAVE_BLKID=1
49BLKID_LIBS="-lblkid"
50BLKID_CFLAGS="-I/tools/include/blkid"
51HAVE_LIBMOUNT=1
52MOUNT_LIBS="-lmount"
53MOUNT_CFLAGS="-I/tools/include/libmount"
54cc_cv_CFLAGS__flto=no</literal>
55EOF</userinput></screen>
56
57 <para>LTO is disabled by default because it causes <command>systemd</command>
58 and other auxiliary programs to link to <filename
59 class="libraryfile">libgcc_s.so</filename>, slows the build down and makes the
60 compiled code larger.</para>
61
62 <para>Additionally, fix a build error when using Util-Linux built in
63 Chapter 5:</para>
64
65<screen><userinput remap="pre">sed -i "s:blkid/::" $(grep -rl "blkid/blkid.h")</userinput></screen>
66
67 <para>Apply the following patch so that compat <command>pkg-config</command> files
68 get installed without installing compat libs which are useless on LFS:</para>
69
70<screen><userinput remap="pre">patch -Np1 -i ../&systemd-compat-patch;</userinput></screen>
71
72 <para>Disable a test case that always fails:</para>
73
74<screen><userinput remap="pre">sed -i "s:test/udev-test.pl ::g" Makefile.in</userinput></screen>
75
76 <para>Prepare systemd for compilation:</para>
77
78<screen><userinput remap="configure">./configure --prefix=/usr \
79 --sysconfdir=/etc \
80 --localstatedir=/var \
81 --config-cache \
82 --with-rootprefix= \
83 --with-rootlibdir=/lib \
84 --enable-split-usr \
85 --disable-gudev \
86 --disable-firstboot \
87 --disable-ldconfig \
88 --disable-sysusers \
89 --without-python \
90 --docdir=/usr/share/doc/systemd-&systemd-version; \
91 --with-dbuspolicydir=/etc/dbus-1/system.d \
92 --with-dbussessionservicedir=/usr/share/dbus-1/services \
93 --with-dbussystemservicedir=/usr/share/dbus-1/system-services</userinput></screen>
94
95 <variablelist>
96 <title>The meaning of the configure options:</title>
97
98 <varlistentry>
99 <term><parameter>--config-cache</parameter></term>
100 <listitem>
101 <para>This switch tells the build system to use
102 the <filename>config.cache</filename> file which
103 was created earlier.</para>
104 </listitem>
105 </varlistentry>
106
107 <varlistentry>
108 <term><parameter>--with-root*</parameter></term>
109 <listitem>
110 <para>These switches ensure that core programs and
111 shared libraries are installed in the subdirectories
112 of the root partition.</para>
113 </listitem>
114 </varlistentry>
115
116 <varlistentry>
117 <term><parameter>--enable-split-usr</parameter></term>
118 <listitem>
119 <para>This switch ensures that systemd will work on
120 systems where /bin, /lib and /sbin directories are not
121 symlinks to their /usr counterparts.</para>
122 </listitem>
123 </varlistentry>
124
125 <varlistentry>
126 <term><parameter>--disable-gudev --without-python</parameter></term>
127 <listitem>
128 <para>These switches disable optional features because
129 LFS does not provide their dependencies.</para>
130 </listitem>
131 </varlistentry>
132
133 <varlistentry>
134 <term><parameter>--disable-firstboot</parameter></term>
135 <listitem>
136 <para>This switch prevents installation of systemd
137 services responsible for setting up the system for
138 the first time. They are not useful for LFS because
139 everything is done manually.</para>
140 </listitem>
141 </varlistentry>
142
143 <varlistentry>
144 <term><parameter>--disable-ldconfig</parameter></term>
145 <listitem>
146 <para>This switch prevents installation of a systemd
147 unit that runs <command>ldconfig</command> at
148 boot, making the boot time longer. Remove it if the
149 described feature is desired, even though it's not
150 useful for source distributions such as LFS.</para>
151 </listitem>
152 </varlistentry>
153
154 <varlistentry>
155 <term><parameter>--disable-sysusers</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 <varlistentry>
166 <term><parameter>--with-dbus*</parameter></term>
167 <listitem>
168 <para>These switches ensure that D-Bus configuration files
169 get installed in the correct locations.</para>
170 </listitem>
171 </varlistentry>
172
173 </variablelist>
174
175 <para>Compile the package:</para>
176
177<screen><userinput remap="make">make LIBRARY_PATH=/tools/lib</userinput></screen>
178
179 <para>This package has a test suite, but it can only be run after the
180 package has been installed.</para>
181
182 <para>Install the package:</para>
183
184<screen><userinput remap="install">make LD_LIBRARY_PATH=/tools/lib install</userinput></screen>
185
186 <para>Move NSS libraries to <filename class="directory">/lib</filename>:</para>
187
188<screen><userinput remap="install">mv -v /usr/lib/libnss_{myhostname,mymachines,resolve}.so.2 /lib</userinput></screen>
189
190 <para>Remove an unnecessary directory:</para>
191
192<screen><userinput remap="install">rm -rfv /usr/lib/rpm</userinput></screen>
193
194 <para>Create the Sysvinit compatibility symlinks, so systemd is used
195 as the default init system:</para>
196
197<screen><userinput remap="install">for tool in runlevel reboot shutdown poweroff halt telinit; do
198 ln -sfv ../bin/systemctl /sbin/${tool}
199done
200ln -sfv ../lib/systemd/systemd /sbin/init</userinput></screen>
201
202 <para>Remove a reference to a non-existent group and fix
203 a configuration file so it doesn't cause
204 <command>systemd-tmpfiles</command> to fail at boot:</para>
205
206<screen><userinput remap="install">sed -i "s:0775 root lock:0755 root root:g" /usr/lib/tmpfiles.d/legacy.conf
207sed -i "/pam.d/d" /usr/lib/tmpfiles.d/etc.conf</userinput></screen>
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, systemd-nspawn,
239 systemd-path, systemd-run, systemd-stdio-bridge, systemd-tmpfiles,
240 systemd-tty-ask-password-agent, telinit, timedatectl, and udevadm</seg>
241 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2, libnss_resolve.so.2,
242 libsystemd.so, and libudev.so</seg>
243 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
244 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
245 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
246 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
247 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
248 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
249 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
250 </seglistitem>
251 </segmentedlist>
252
253 <variablelist>
254 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
255 <?dbfo list-presentation="list"?>
256 <?dbhtml list-presentation="table"?>
257
258 <varlistentry id="bootctl">
259 <term><command>bootctl</command></term>
260 <listitem>
261 <para>used to query the firmware and boot manager settings</para>
262 <indexterm zone="ch-system-systemd bootctl">
263 <primary sortas="b-bootctl">bootctl</primary>
264 </indexterm>
265 </listitem>
266 </varlistentry>
267
268 <varlistentry id="busctl">
269 <term><command>busctl</command></term>
270 <listitem>
271 <para>Used to introspect and monitor the D-Bus bus</para>
272 <indexterm zone="ch-system-systemd busctl">
273 <primary sortas="b-busctl">busctl</primary>
274 </indexterm>
275 </listitem>
276 </varlistentry>
277
278 <varlistentry id="coredumpctl">
279 <term><command>coredumpctl</command></term>
280 <listitem>
281 <para>Used to retrieve coredumps from the systemd Journal</para>
282 <indexterm zone="ch-system-systemd coredumpctl">
283 <primary sortas="b-coredumpctl">coredumpctl</primary>
284 </indexterm>
285 </listitem>
286 </varlistentry>
287
288 <varlistentry id="halt">
289 <term><command>halt</command></term>
290 <listitem>
291 <para>Normally invokes <command>shutdown</command> with the
292 <parameter>-h</parameter> option, except when already in run-level 0,
293 then it tells the kernel to halt the system; it notes in the
294 file <filename>/var/log/wtmp</filename> that the system is being
295 brought down</para>
296 <indexterm zone="ch-system-systemd halt">
297 <primary sortas="b-halt">halt</primary>
298 </indexterm>
299 </listitem>
300 </varlistentry>
301
302 <varlistentry id="hostnamectl">
303 <term><command>hostnamectl</command></term>
304 <listitem>
305 <para>Used to query and change the system hostname and related
306 settings</para>
307 <indexterm zone="ch-system-systemd hostnamectl">
308 <primary sortas="b-hostnamectl">hostnamectl</primary>
309 </indexterm>
310 </listitem>
311 </varlistentry>
312
313 <varlistentry id="init">
314 <term><command>init</command></term>
315 <listitem>
316 <para>The first process to be started when the kernel has initialized
317 the hardware which takes over the boot process and starts all the
318 proceses it is instructed to</para>
319 <indexterm zone="ch-system-systemd init">
320 <primary sortas="b-init">init</primary>
321 </indexterm>
322 </listitem>
323 </varlistentry>
324
325 <varlistentry id="journalctl">
326 <term><command>journalctl</command></term>
327 <listitem>
328 <para>Used to query the contents of the systemd Journal</para>
329 <indexterm zone="ch-system-systemd journalctl">
330 <primary sortas="b-journalctl">journalctl</primary>
331 </indexterm>
332 </listitem>
333 </varlistentry>
334
335 <varlistentry id="kernel-install">
336 <term><command>kernel-install</command></term>
337 <listitem>
338 <para>Used to add and remove kernel and initramfs images to and
339 from /boot</para>
340 <indexterm zone="ch-system-systemd kernel-install">
341 <primary sortas="b-kernel-install">kernel-install</primary>
342 </indexterm>
343 </listitem>
344 </varlistentry>
345
346 <varlistentry id="localectl">
347 <term><command>localectl</command></term>
348 <listitem>
349 <para>Used to query and change the system locale and keyboard layout
350 settings</para>
351 <indexterm zone="ch-system-systemd localectl">
352 <primary sortas="b-localectl">localectl</primary>
353 </indexterm>
354 </listitem>
355 </varlistentry>
356
357 <varlistentry id="loginctl">
358 <term><command>loginctl</command></term>
359 <listitem>
360 <para>Used to introspect and control the state of the systemd Login
361 Manager</para>
362 <indexterm zone="ch-system-systemd loginctl">
363 <primary sortas="b-loginctl">loginctl</primary>
364 </indexterm>
365 </listitem>
366 </varlistentry>
367
368 <varlistentry id="machinectl">
369 <term><command>machinectl</command></term>
370 <listitem>
371 <para>Used to introspect and control the state of the systemd Virtual
372 Machine and Container Registration Manager</para>
373 <indexterm zone="ch-system-systemd machinectl">
374 <primary sortas="b-machinectl">machinectl</primary>
375 </indexterm>
376 </listitem>
377 </varlistentry>
378
379 <varlistentry id="networkctl">
380 <term><command>networkctl</command></term>
381 <listitem>
382 <para>Used to introspect the state of the network links as seen by
383 systemd-networkd</para>
384 <indexterm zone="ch-system-systemd networkctl">
385 <primary sortas="b-networkctl">networkctl</primary>
386 </indexterm>
387 </listitem>
388 </varlistentry>
389
390 <varlistentry id="poweroff">
391 <term><command>poweroff</command></term>
392 <listitem>
393 <para>Tells the kernel to halt the system and switch off the computer
394 (see <command>halt</command>)</para>
395 <indexterm zone="ch-system-systemd poweroff">
396 <primary sortas="b-poweroff">poweroff</primary>
397 </indexterm>
398 </listitem>
399 </varlistentry>
400
401 <varlistentry id="reboot">
402 <term><command>reboot</command></term>
403 <listitem>
404 <para>Tells the kernel to reboot the system (see
405 <command>halt</command>)</para>
406 <indexterm zone="ch-system-systemd reboot">
407 <primary sortas="b-reboot">reboot</primary>
408 </indexterm>
409 </listitem>
410 </varlistentry>
411
412 <varlistentry id="runlevel">
413 <term><command>runlevel</command></term>
414 <listitem>
415 <para>Reports the previous and the current run-level, as noted in the
416 last run-level record in <filename>/var/run/utmp</filename></para>
417 <indexterm zone="ch-system-systemd runlevel">
418 <primary sortas="b-runlevel">runlevel</primary>
419 </indexterm>
420 </listitem>
421 </varlistentry>
422
423 <varlistentry id="shutdown">
424 <term><command>shutdown</command></term>
425 <listitem>
426 <para>Brings the system down in a secure way, signaling all processes
427 and notifying all logged-in users</para>
428 <indexterm zone="ch-system-systemd shutdown">
429 <primary sortas="b-shutdown">shutdown</primary>
430 </indexterm>
431 </listitem>
432 </varlistentry>
433
434 <varlistentry id="systemctl">
435 <term><command>systemctl</command></term>
436 <listitem>
437 <para>Used to introspect and control the state of the systemd system and
438 service manager</para>
439 <indexterm zone="ch-system-systemd systemctl">
440 <primary sortas="b-systemctl">systemctl</primary>
441 </indexterm>
442 </listitem>
443 </varlistentry>
444
445 <varlistentry id="systemd-analyze">
446 <term><command>systemd-analyze</command></term>
447 <listitem>
448 <para>Used to determine system boot-up performance of the current boot
449 </para>
450 <indexterm zone="ch-system-systemd systemd-analyze">
451 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
452 </indexterm>
453 </listitem>
454 </varlistentry>
455
456 <varlistentry id="systemd-ask-password">
457 <term><command>systemd-ask-password</command></term>
458 <listitem>
459 <para>Used to query a system password or passphrase from the user, using a
460 question message specified on the command line</para>
461 <indexterm zone="ch-system-systemd systemd-ask-password">
462 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
463 </indexterm>
464 </listitem>
465 </varlistentry>
466
467 <varlistentry id="systemd-cat">
468 <term><command>systemd-cat</command></term>
469 <listitem>
470 <para>Used to connect STDOUT and STDERR of a process with the Journal
471 </para>
472 <indexterm zone="ch-system-systemd systemd-cat">
473 <primary sortas="b-systemd-cat">systemd-cat</primary>
474 </indexterm>
475 </listitem>
476 </varlistentry>
477
478 <varlistentry id="systemd-cgls">
479 <term><command>systemd-cgls</command></term>
480 <listitem>
481 <para>Recursively shows the contents of the selected Linux control group
482 hierarchy in a tree</para>
483 <indexterm zone="ch-system-systemd systemd-cgls">
484 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
485 </indexterm>
486 </listitem>
487 </varlistentry>
488
489 <varlistentry id="systemd-cgtop">
490 <term><command>systemd-cgtop</command></term>
491 <listitem>
492 <para>Shows the top control groups of the local Linux control group hierarchy,
493 ordered by their CPU, memory and disk I/O load</para>
494 <indexterm zone="ch-system-systemd systemd-cgtop">
495 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
496 </indexterm>
497 </listitem>
498 </varlistentry>
499
500 <varlistentry id="systemd-delta">
501 <term><command>systemd-delta</command></term>
502 <listitem>
503 <para>Used to identify and compare configuration files in
504 <filename class="directory">/etc</filename> that override default
505 counterparts in <filename class="directory">/usr</filename></para>
506 <indexterm zone="ch-system-systemd systemd-delta">
507 <primary sortas="b-systemd-delta">systemd-delta</primary>
508 </indexterm>
509 </listitem>
510 </varlistentry>
511
512 <varlistentry id="systemd-detect-virt">
513 <term><command>systemd-detect-virt</command></term>
514 <listitem>
515 <para>Detects execution in a virtualized environment</para>
516 <indexterm zone="ch-system-systemd systemd-detect-virt">
517 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
518 </indexterm>
519 </listitem>
520 </varlistentry>
521
522 <varlistentry id="systemd-escape">
523 <term><command>systemd-escape</command></term>
524 <listitem>
525 <para>Used to escape strings for inclusion in systemd unit 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 inhibitor lock
546 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 stored in
557 <filename>/etc/machine-id</filename> at install time with a randomly
558 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-notify">
566 <term><command>systemd-notify</command></term>
567 <listitem>
568 <para>Used by daemon scripts to notify the init system about status changes
569 </para>
570 <indexterm zone="ch-system-systemd systemd-notify">
571 <primary sortas="b-systemd-notify">systemd-notify</primary>
572 </indexterm>
573 </listitem>
574 </varlistentry>
575
576 <varlistentry id="systemd-nspawn">
577 <term><command>systemd-nspawn</command></term>
578 <listitem>
579 <para>Used to run a command or OS in a light-weight namespace container</para>
580 <indexterm zone="ch-system-systemd systemd-nspawn">
581 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
582 </indexterm>
583 </listitem>
584 </varlistentry>
585
586 <varlistentry id="systemd-path">
587 <term><command>systemd-path</command></term>
588 <listitem>
589 <para>Used to query system and user paths</para>
590 <indexterm zone="ch-system-systemd systemd-path">
591 <primary sortas="b-systemd-path">systemd-path</primary>
592 </indexterm>
593 </listitem>
594 </varlistentry>
595
596 <varlistentry id="systemd-run">
597 <term><command>systemd-run</command></term>
598 <listitem>
599 <para>Used to create and start a transient .service or a .scope unit and
600 run the specified command in it</para>
601 <indexterm zone="ch-system-systemd systemd-run">
602 <primary sortas="b-systemd-run">systemd-run</primary>
603 </indexterm>
604 </listitem>
605 </varlistentry>
606
607 <!-- <varlistentry id="systemd-stdio-bridge">
608 <term><command>systemd-stdio-bridge</command></term>
609 <listitem>
610 <para>To be completed</para>
611 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
612 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
613 </indexterm>
614 </listitem>
615 </varlistentry> -->
616
617 <varlistentry id="systemd-tmpfiles">
618 <term><command>systemd-tmpfiles</command></term>
619 <listitem>
620 <para>Creates, deletes and cleans up volatile and temporary files and directories,
621 based on the configuration file format and location specified in
622 <filename class="directory">tmpfiles.d</filename> directories</para>
623 <indexterm zone="ch-system-systemd systemd-tmpfiles">
624 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
625 </indexterm>
626 </listitem>
627 </varlistentry>
628
629 <varlistentry id="systemd-tty-ask-password-agent">
630 <term><command>systemd-tty-ask-password-agent</command></term>
631 <listitem>
632 <para>Used to list or process pending systemd password requests</para>
633 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
634 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
635 </indexterm>
636 </listitem>
637 </varlistentry>
638
639 <varlistentry id="telinit">
640 <term><command>telinit</command></term>
641 <listitem>
642 <para>Tells <command>init</command> which run-level to change to</para>
643 <indexterm zone="ch-system-systemd telinit">
644 <primary sortas="b-telinit">telinit</primary>
645 </indexterm>
646 </listitem>
647 </varlistentry>
648
649 <varlistentry id="timedatectl">
650 <term><command>timedatectl</command></term>
651 <listitem>
652 <para>Used to query and change the system clock and its settings
653 </para>
654 <indexterm zone="ch-system-systemd timedatectl">
655 <primary sortas="b-timedatectl">timedatectl</primary>
656 </indexterm>
657 </listitem>
658 </varlistentry>
659
660 <varlistentry id="udevadm">
661 <term><command>udevadm</command></term>
662 <listitem>
663 <para>Generic Udev administration tool: controls the udevd daemon,
664 provides info from the Udev database, monitors uevents, waits for
665 uevents to finish, tests Udev configuration, and triggers uevents
666 for a given device</para>
667 <indexterm zone="ch-system-systemd udevadm">
668 <primary sortas="b-udevadm">udevadm</primary>
669 </indexterm>
670 </listitem>
671 </varlistentry>
672
673 <varlistentry id="libsystemd">
674 <term><filename class="libraryfile">libsystemd</filename></term>
675 <listitem>
676 <para>systemd utility library</para>
677 <indexterm zone="ch-system-systemd libsystemd">
678 <primary sortas="c-libsystemd">libsystemd</primary>
679 </indexterm>
680 </listitem>
681 </varlistentry>
682
683 <varlistentry id="libudev">
684 <term><filename class="libraryfile">libudev</filename></term>
685 <listitem>
686 <para>A library to access Udev device information</para>
687 <indexterm zone="ch-system-systemd libudev">
688 <primary sortas="c-libudev">libudev</primary>
689 </indexterm>
690 </listitem>
691 </varlistentry>
692
693 </variablelist>
694
695 </sect2>
696
697</sect1>
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