source: chapter06/systemd.xml@ f682fb5f

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Last change on this file since f682fb5f was 872899f, checked in by DJ Lucas <dj@…>, 7 years ago

Remove the rest of the test suite stuff from the systemd package.

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11272 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-system-systemd" role="wrap" revision="systemd">
9 <?dbhtml filename="systemd.html"?>
10
11 <sect1info condition="script">
12 <productname>systemd</productname>
13 <productnumber>&systemd-version;</productnumber>
14 <address>&systemd-url;</address>
15 </sect1info>
16
17 <title>Systemd-&systemd-version;</title>
18
19 <indexterm zone="ch-system-systemd">
20 <primary sortas="a-systemd">systemd</primary>
21 </indexterm>
22
23 <sect2 role="package">
24 <title/>
25
26 <para>The systemd package contains programs for controlling the startup,
27 running, and shutdown of the system.</para>
28
29 <segmentedlist>
30 <segtitle>&buildtime;</segtitle>
31 <segtitle>&diskspace;</segtitle>
32
33 <seglistitem>
34 <seg>&systemd-ch6-sbu;</seg>
35 <seg>&systemd-ch6-du;</seg>
36 </seglistitem>
37 </segmentedlist>
38 </sect2>
39
40 <sect2 role="installation">
41 <title>Installation of systemd</title>
42
43 <para>Create a 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
58SULOGIN="/sbin/sulogin"
59GPERF_LEN_TYPE=size_t
60XSLTPROC="/usr/bin/xsltproc"</literal>
61EOF</userinput></screen>
62
63 <para>LTO is disabled by default because it causes
64 <command>systemd</command> and other auxiliary programs to link to
65 <filename class="libraryfile">libgcc_s.so</filename>, slows the build down
66 and makes the compiled code larger.</para>
67
68 <para>Prepare systemd for compilation:</para>
69
70<screen><userinput remap="configure">./configure --prefix=/usr \
71 --sysconfdir=/etc \
72 --localstatedir=/var \
73 --config-cache \
74 --with-rootprefix= \
75 --with-rootlibdir=/lib \
76 --enable-split-usr \
77 --disable-firstboot \
78 --disable-ldconfig \
79 --disable-sysusers \
80 --without-python \
81 --with-default-dnssec=no \
82 --docdir=/usr/share/doc/systemd-&systemd-version;</userinput></screen>
83
84 <variablelist>
85 <title>The meaning of the configure options:</title>
86
87 <varlistentry>
88 <term><parameter>--config-cache</parameter></term>
89 <listitem>
90 <para>This switch tells the build system to use
91 the <filename>config.cache</filename> file which
92 was created earlier.</para>
93 </listitem>
94 </varlistentry>
95
96 <varlistentry>
97 <term><parameter>--with-root*</parameter></term>
98 <listitem>
99 <para>These switches ensure that core programs and
100 shared libraries are installed in the subdirectories
101 of the root partition.</para>
102 </listitem>
103 </varlistentry>
104
105 <varlistentry>
106 <term><parameter>--enable-split-usr</parameter></term>
107 <listitem>
108 <para>This switch ensures that systemd will work on
109 systems where /bin, /lib and /sbin directories are not
110 symlinks to their /usr counterparts.</para>
111 </listitem>
112 </varlistentry>
113
114 <varlistentry>
115 <term><parameter>--without-python</parameter></term>
116 <listitem>
117 <para>This switch prevents <command>configure</command>
118 from trying to use Python which isn't built
119 in LFS.</para>
120 </listitem>
121 </varlistentry>
122
123 <varlistentry>
124 <term><parameter>--disable-firstboot</parameter></term>
125 <listitem>
126 <para>This switch prevents installation of systemd
127 services responsible for setting up the system for
128 the first time. They are not useful for LFS because
129 everything is done manually.</para>
130 </listitem>
131 </varlistentry>
132
133 <varlistentry>
134 <term><parameter>--disable-ldconfig</parameter></term>
135 <listitem>
136 <para>This switch prevents installation of a systemd
137 unit that runs <command>ldconfig</command> at
138 boot, making the boot time longer. Remove it if the
139 described feature is desired, even though it's not
140 useful for source distributions such as LFS.</para>
141 </listitem>
142 </varlistentry>
143
144 <varlistentry>
145 <term><parameter>--disable-sysusers</parameter></term>
146 <listitem>
147 <para>This switch prevents installation of systemd
148 services responsible for setting up the
149 <filename>/etc/group</filename> and
150 <filename>/etc/passwd</filename> files. Both files
151 were created early in this chapter.</para>
152 </listitem>
153 </varlistentry>
154
155 <varlistentry>
156 <term><parameter>--with-default-dnssec=no</parameter></term>
157 <listitem>
158 <para>This switch turns off the experimental DNSSEC support.</para>
159 </listitem>
160 </varlistentry>
161
162 </variablelist>
163
164 <para>Compile the package:</para>
165
166<screen><userinput remap="make">make</userinput></screen>
167
168 <para>This package has a test suite, but it can only be run after the
169 package has been reinstalled in BLFS.</para>
170
171 <para>Install the package:</para>
172
173<screen><userinput remap="install">make install</userinput></screen>
174
175<!-- These get installed into /lib now by default.
176 <para>Move the NSS libraries to <filename class="directory">/lib</filename>:</para>
177
178<screen><userinput remap="install">mv -v /usr/lib/libnss_{myhostname,mymachines,resolve}.so.2 /lib</userinput></screen>
179-->
180
181 <para>Remove an unnecessary directory:</para>
182
183<screen><userinput remap="install">rm -rfv /usr/lib/rpm</userinput></screen>
184
185 <para>Create the Sysvinit compatibility symlinks, so systemd is used
186 as the default init system:</para>
187
188<screen><userinput remap="install">for tool in runlevel reboot shutdown poweroff halt telinit; do
189 ln -sfv ../bin/systemctl /sbin/${tool}
190done
191ln -sfv ../lib/systemd/systemd /sbin/init</userinput></screen>
192
193 <para>Create the <filename>/etc/machine-id</filename> file needed by
194 <command>systemd-journald</command>:</para>
195
196<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
197
198 </sect2>
199
200 <sect2 id="contents-systemd" role="content">
201 <title>Contents of systemd</title>
202
203 <segmentedlist>
204 <segtitle>Installed programs</segtitle>
205 <segtitle>Installed libraries</segtitle>
206 <segtitle>Installed directories</segtitle>
207
208 <seglistitem>
209 <seg>bootctl, busctl, coredumpctl, halt, hostnamectl, init, journalctl,
210 kernel-install, localectl, loginctl, machinectl, networkctl, poweroff,
211 reboot, runlevel, shutdown, systemctl, systemd-analyze,
212 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
213 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
214 systemd-inhibit, systemd-machine-id-setup, systemd-mount,
215 systemd-notify, systemd-nspawn, systemd-path, systemd-resolve,
216 systemd-run, systemd-socket-activate,
217 systemd-stdio-bridge, systemd-tmpfiles, systemd-tty-ask-password-agent,
218 telinit, timedatectl, and udevadm</seg>
219 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
220 libnss_resolve.so.2, libnss_systemd.so.2,
221 libsystemd.so, libsystemd-shared-231.so,
222 and libudev.so</seg>
223 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
224 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
225 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
226 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
227 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
228 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
229 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
230 </seglistitem>
231 </segmentedlist>
232
233 <variablelist>
234 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
235 <?dbfo list-presentation="list"?>
236 <?dbhtml list-presentation="table"?>
237
238 <varlistentry id="bootctl">
239 <term><command>bootctl</command></term>
240 <listitem>
241 <para>used to query the firmware and boot manager settings</para>
242 <indexterm zone="ch-system-systemd bootctl">
243 <primary sortas="b-bootctl">bootctl</primary>
244 </indexterm>
245 </listitem>
246 </varlistentry>
247
248 <varlistentry id="busctl">
249 <term><command>busctl</command></term>
250 <listitem>
251 <para>Used to introspect and monitor the D-Bus bus</para>
252 <indexterm zone="ch-system-systemd busctl">
253 <primary sortas="b-busctl">busctl</primary>
254 </indexterm>
255 </listitem>
256 </varlistentry>
257
258 <varlistentry id="coredumpctl">
259 <term><command>coredumpctl</command></term>
260 <listitem>
261 <para>Used to retrieve coredumps from the systemd Journal</para>
262 <indexterm zone="ch-system-systemd coredumpctl">
263 <primary sortas="b-coredumpctl">coredumpctl</primary>
264 </indexterm>
265 </listitem>
266 </varlistentry>
267
268 <varlistentry id="halt">
269 <term><command>halt</command></term>
270 <listitem>
271 <para>Normally invokes <command>shutdown</command> with the
272 <parameter>-h</parameter> option, except when already in run-level 0,
273 then it tells the kernel to halt the system; it notes in the
274 file <filename>/var/log/wtmp</filename> that the system is being
275 brought down</para>
276 <indexterm zone="ch-system-systemd halt">
277 <primary sortas="b-halt">halt</primary>
278 </indexterm>
279 </listitem>
280 </varlistentry>
281
282 <varlistentry id="hostnamectl">
283 <term><command>hostnamectl</command></term>
284 <listitem>
285 <para>Used to query and change the system hostname and related
286 settings</para>
287 <indexterm zone="ch-system-systemd hostnamectl">
288 <primary sortas="b-hostnamectl">hostnamectl</primary>
289 </indexterm>
290 </listitem>
291 </varlistentry>
292
293 <varlistentry id="init">
294 <term><command>init</command></term>
295 <listitem>
296 <para>The first process to be started when the kernel has initialized
297 the hardware which takes over the boot process and starts all the
298 proceses it is instructed to</para>
299 <indexterm zone="ch-system-systemd init">
300 <primary sortas="b-init">init</primary>
301 </indexterm>
302 </listitem>
303 </varlistentry>
304
305 <varlistentry id="journalctl">
306 <term><command>journalctl</command></term>
307 <listitem>
308 <para>Used to query the contents of the systemd Journal</para>
309 <indexterm zone="ch-system-systemd journalctl">
310 <primary sortas="b-journalctl">journalctl</primary>
311 </indexterm>
312 </listitem>
313 </varlistentry>
314
315 <varlistentry id="kernel-install">
316 <term><command>kernel-install</command></term>
317 <listitem>
318 <para>Used to add and remove kernel and initramfs images to and
319 from /boot</para>
320 <indexterm zone="ch-system-systemd kernel-install">
321 <primary sortas="b-kernel-install">kernel-install</primary>
322 </indexterm>
323 </listitem>
324 </varlistentry>
325
326 <varlistentry id="localectl">
327 <term><command>localectl</command></term>
328 <listitem>
329 <para>Used to query and change the system locale and keyboard layout
330 settings</para>
331 <indexterm zone="ch-system-systemd localectl">
332 <primary sortas="b-localectl">localectl</primary>
333 </indexterm>
334 </listitem>
335 </varlistentry>
336
337 <varlistentry id="loginctl">
338 <term><command>loginctl</command></term>
339 <listitem>
340 <para>Used to introspect and control the state of the systemd Login
341 Manager</para>
342 <indexterm zone="ch-system-systemd loginctl">
343 <primary sortas="b-loginctl">loginctl</primary>
344 </indexterm>
345 </listitem>
346 </varlistentry>
347
348 <varlistentry id="machinectl">
349 <term><command>machinectl</command></term>
350 <listitem>
351 <para>Used to introspect and control the state of the systemd Virtual
352 Machine and Container Registration Manager</para>
353 <indexterm zone="ch-system-systemd machinectl">
354 <primary sortas="b-machinectl">machinectl</primary>
355 </indexterm>
356 </listitem>
357 </varlistentry>
358
359 <varlistentry id="networkctl">
360 <term><command>networkctl</command></term>
361 <listitem>
362 <para>Used to introspect the state of the network links as seen by
363 systemd-networkd</para>
364 <indexterm zone="ch-system-systemd networkctl">
365 <primary sortas="b-networkctl">networkctl</primary>
366 </indexterm>
367 </listitem>
368 </varlistentry>
369
370 <varlistentry id="poweroff">
371 <term><command>poweroff</command></term>
372 <listitem>
373 <para>Tells the kernel to halt the system and switch off the computer
374 (see <command>halt</command>)</para>
375 <indexterm zone="ch-system-systemd poweroff">
376 <primary sortas="b-poweroff">poweroff</primary>
377 </indexterm>
378 </listitem>
379 </varlistentry>
380
381 <varlistentry id="reboot">
382 <term><command>reboot</command></term>
383 <listitem>
384 <para>Tells the kernel to reboot the system (see
385 <command>halt</command>)</para>
386 <indexterm zone="ch-system-systemd reboot">
387 <primary sortas="b-reboot">reboot</primary>
388 </indexterm>
389 </listitem>
390 </varlistentry>
391
392 <varlistentry id="runlevel">
393 <term><command>runlevel</command></term>
394 <listitem>
395 <para>Reports the previous and the current run-level, as noted in the
396 last run-level record in <filename>/var/run/utmp</filename></para>
397 <indexterm zone="ch-system-systemd runlevel">
398 <primary sortas="b-runlevel">runlevel</primary>
399 </indexterm>
400 </listitem>
401 </varlistentry>
402
403 <varlistentry id="shutdown">
404 <term><command>shutdown</command></term>
405 <listitem>
406 <para>Brings the system down in a secure way, signaling all processes
407 and notifying all logged-in users</para>
408 <indexterm zone="ch-system-systemd shutdown">
409 <primary sortas="b-shutdown">shutdown</primary>
410 </indexterm>
411 </listitem>
412 </varlistentry>
413
414 <varlistentry id="systemctl">
415 <term><command>systemctl</command></term>
416 <listitem>
417 <para>Used to introspect and control the state of the systemd system
418 and service manager</para>
419 <indexterm zone="ch-system-systemd systemctl">
420 <primary sortas="b-systemctl">systemctl</primary>
421 </indexterm>
422 </listitem>
423 </varlistentry>
424
425 <varlistentry id="systemd-analyze">
426 <term><command>systemd-analyze</command></term>
427 <listitem>
428 <para>Used to determine system boot-up performance of the current
429 boot</para>
430 <indexterm zone="ch-system-systemd systemd-analyze">
431 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
432 </indexterm>
433 </listitem>
434 </varlistentry>
435
436 <varlistentry id="systemd-ask-password">
437 <term><command>systemd-ask-password</command></term>
438 <listitem>
439 <para>Used to query a system password or passphrase from the user,
440 using a question message specified on the command line</para>
441 <indexterm zone="ch-system-systemd systemd-ask-password">
442 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
443 </indexterm>
444 </listitem>
445 </varlistentry>
446
447 <varlistentry id="systemd-cat">
448 <term><command>systemd-cat</command></term>
449 <listitem>
450 <para>Used to connect STDOUT and STDERR of a process with the Journal
451 </para>
452 <indexterm zone="ch-system-systemd systemd-cat">
453 <primary sortas="b-systemd-cat">systemd-cat</primary>
454 </indexterm>
455 </listitem>
456 </varlistentry>
457
458 <varlistentry id="systemd-cgls">
459 <term><command>systemd-cgls</command></term>
460 <listitem>
461 <para>Recursively shows the contents of the selected Linux control
462 group hierarchy in a tree</para>
463 <indexterm zone="ch-system-systemd systemd-cgls">
464 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
465 </indexterm>
466 </listitem>
467 </varlistentry>
468
469 <varlistentry id="systemd-cgtop">
470 <term><command>systemd-cgtop</command></term>
471 <listitem>
472 <para>Shows the top control groups of the local Linux control group
473 hierarchy, ordered by their CPU, memory and disk I/O load</para>
474 <indexterm zone="ch-system-systemd systemd-cgtop">
475 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
476 </indexterm>
477 </listitem>
478 </varlistentry>
479
480 <varlistentry id="systemd-delta">
481 <term><command>systemd-delta</command></term>
482 <listitem>
483 <para>Used to identify and compare configuration files in
484 <filename class="directory">/etc</filename> that override default
485 counterparts in <filename class="directory">/usr</filename></para>
486 <indexterm zone="ch-system-systemd systemd-delta">
487 <primary sortas="b-systemd-delta">systemd-delta</primary>
488 </indexterm>
489 </listitem>
490 </varlistentry>
491
492 <varlistentry id="systemd-detect-virt">
493 <term><command>systemd-detect-virt</command></term>
494 <listitem>
495 <para>Detects execution in a virtualized environment</para>
496 <indexterm zone="ch-system-systemd systemd-detect-virt">
497 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
498 </indexterm>
499 </listitem>
500 </varlistentry>
501
502 <varlistentry id="systemd-escape">
503 <term><command>systemd-escape</command></term>
504 <listitem>
505 <para>Used to escape strings for inclusion in systemd unit
506 names</para>
507 <indexterm zone="ch-system-systemd systemd-escape">
508 <primary sortas="b-systemd-escape">systemd-escape</primary>
509 </indexterm>
510 </listitem>
511 </varlistentry>
512
513 <varlistentry id="systemd-hwdb">
514 <term><command>systemd-hwdb</command></term>
515 <listitem>
516 <para>Used to manage hardware database (hwdb)</para>
517 <indexterm zone="ch-system-systemd systemd-hwdb">
518 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
519 </indexterm>
520 </listitem>
521 </varlistentry>
522
523 <varlistentry id="systemd-inhibit">
524 <term><command>systemd-inhibit</command></term>
525 <listitem>
526 <para>Used to execute a program with a shutdown, sleep or idle
527 inhibitor lock taken</para>
528 <indexterm zone="ch-system-systemd systemd-inhibit">
529 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
530 </indexterm>
531 </listitem>
532 </varlistentry>
533
534 <varlistentry id="systemd-machine-id-setup">
535 <term><command>systemd-machine-id-setup</command></term>
536 <listitem>
537 <para>Used by system installer tools to initialize the machine ID
538 stored in <filename>/etc/machine-id</filename> at install time with a
539 randomly generated ID</para>
540 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
541 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
542 </indexterm>
543 </listitem>
544 </varlistentry>
545
546 <varlistentry id="systemd-mount">
547 <term><command>systemd-mount</command></term>
548 <listitem>
549 <para>is a tool to temporarily mount or auto-mount a drive.</para>
550 <indexterm zone="ch-system-systemd systemd-mount">
551 <primary sortas="b-systemd-mount">systemd-mount</primary>
552 </indexterm>
553 </listitem>
554 </varlistentry>
555
556 <varlistentry id="systemd-notify">
557 <term><command>systemd-notify</command></term>
558 <listitem>
559 <para>Used by daemon scripts to notify the init system about status
560 changes</para>
561 <indexterm zone="ch-system-systemd systemd-notify">
562 <primary sortas="b-systemd-notify">systemd-notify</primary>
563 </indexterm>
564 </listitem>
565 </varlistentry>
566
567 <varlistentry id="systemd-nspawn">
568 <term><command>systemd-nspawn</command></term>
569 <listitem>
570 <para>Used to run a command or OS in a light-weight namespace
571 container</para>
572 <indexterm zone="ch-system-systemd systemd-nspawn">
573 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
574 </indexterm>
575 </listitem>
576 </varlistentry>
577
578 <varlistentry id="systemd-path">
579 <term><command>systemd-path</command></term>
580 <listitem>
581 <para>Used to query system and user paths</para>
582 <indexterm zone="ch-system-systemd systemd-path">
583 <primary sortas="b-systemd-path">systemd-path</primary>
584 </indexterm>
585 </listitem>
586 </varlistentry>
587
588 <varlistentry id="systemd-resolve">
589 <term><command>systemd-resolve</command></term>
590 <listitem>
591 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
592 resource records, and services</para>
593 <indexterm zone="ch-system-systemd systemd-resolve">
594 <primary sortas="b-systemd-resolve">systemd-resolve</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
603 and 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-socket-activate">
621 <term><command>systemd-socket-activate</command></term>
622 <listitem>
623 <para>is a tool to listen on socket devices and launch a process upon
624 connection.</para>
625 <indexterm zone="ch-system-systemd systemd-socket-activate">
626 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</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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