source: chapter06/systemd.xml@ eece29d

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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>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/::" $(grep -rl "blkid/blkid.h")</userinput></screen>
47
48 <para>Fix a potential security issue with framebuffer devices:</para>
49
50<screen><userinput remap="pre">sed -e 's@DRI and frame buffer@DRI@' \
51 -e '/SUBSYSTEM==\"graphics\", KERNEL==\"fb\*\"/d' \
52 -i src/login/70-uaccess.rules</userinput></screen>
53
54 <para>Disable two tests that always fail:</para>
55
56<screen><userinput remap="pre">sed -e 's@test/udev-test.pl @@' \
57 -e 's@test-copy$(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 --with-default-dnssec=no \
102 --docdir=/usr/share/doc/systemd-&systemd-version;</userinput></screen>
103
104 <variablelist>
105 <title>The meaning of the configure options:</title>
106
107 <varlistentry>
108 <term><parameter>--config-cache</parameter></term>
109 <listitem>
110 <para>This switch tells the build system to use
111 the <filename>config.cache</filename> file which
112 was created earlier.</para>
113 </listitem>
114 </varlistentry>
115
116 <varlistentry>
117 <term><parameter>--with-root*</parameter></term>
118 <listitem>
119 <para>These switches ensure that core programs and
120 shared libraries are installed in the subdirectories
121 of the root partition.</para>
122 </listitem>
123 </varlistentry>
124
125 <varlistentry>
126 <term><parameter>--enable-split-usr</parameter></term>
127 <listitem>
128 <para>This switch ensures that systemd will work on
129 systems where /bin, /lib and /sbin directories are not
130 symlinks to their /usr counterparts.</para>
131 </listitem>
132 </varlistentry>
133
134 <varlistentry>
135 <term><parameter>--without-python</parameter></term>
136 <listitem>
137 <para>This switch prevents <command>configure</command>
138 from trying to use Python which isn't built
139 in LFS.</para>
140 </listitem>
141 </varlistentry>
142
143 <varlistentry>
144 <term><parameter>--disable-firstboot</parameter></term>
145 <listitem>
146 <para>This switch prevents installation of systemd
147 services responsible for setting up the system for
148 the first time. They are not useful for LFS because
149 everything is done manually.</para>
150 </listitem>
151 </varlistentry>
152
153 <varlistentry>
154 <term><parameter>--disable-ldconfig</parameter></term>
155 <listitem>
156 <para>This switch prevents installation of a systemd
157 unit that runs <command>ldconfig</command> at
158 boot, making the boot time longer. Remove it if the
159 described feature is desired, even though it's not
160 useful for source distributions such as LFS.</para>
161 </listitem>
162 </varlistentry>
163
164 <varlistentry>
165 <term><parameter>--disable-sysusers</parameter></term>
166 <listitem>
167 <para>This switch prevents installation of systemd
168 services responsible for setting up the
169 <filename>/etc/group</filename> and
170 <filename>/etc/passwd</filename> files. Both files
171 were created early in this chapter.</para>
172 </listitem>
173 </varlistentry>
174
175 <varlistentry>
176 <term><parameter>--with-default-dnssec=no</parameter></term>
177 <listitem>
178 <para>This switch turns off the experimental DNSSEC suport.</para>
179 </listitem>
180 </varlistentry>
181
182 </variablelist>
183
184 <para>Compile the package:</para>
185
186<screen><userinput remap="make">make LIBRARY_PATH=/tools/lib</userinput></screen>
187
188 <para>This package has a test suite, but it can only be run after the
189 package has been installed.</para>
190
191 <para>Install the package:</para>
192
193<screen><userinput remap="install">make LD_LIBRARY_PATH=/tools/lib install</userinput></screen>
194
195 <para>Move NSS libraries to <filename class="directory">/lib</filename>:</para>
196
197<screen><userinput remap="install">mv -v /usr/lib/libnss_{myhostname,mymachines,resolve}.so.2 /lib</userinput></screen>
198
199 <para>Remove an unnecessary directory:</para>
200
201<screen><userinput remap="install">rm -rfv /usr/lib/rpm</userinput></screen>
202
203 <para>Create the Sysvinit compatibility symlinks, so systemd is used
204 as the default init system:</para>
205
206<screen><userinput remap="install">for tool in runlevel reboot shutdown poweroff halt telinit; do
207 ln -sfv ../bin/systemctl /sbin/${tool}
208done
209ln -sfv ../lib/systemd/systemd /sbin/init</userinput></screen>
210
211<!--
212 <para>Remove a reference to a non-existent group:</para>
213
214<screen><userinput remap="install">sed -i "s:0775 root lock:0755 root root:g" /usr/lib/tmpfiles.d/legacy.conf</userinput></screen>
215-->
216
217 <para>Create the <filename>/etc/machine-id</filename> file needed by
218 <command>systemd-journald</command>:</para>
219
220<screen><userinput remap="install">systemd-machine-id-setup</userinput></screen>
221
222 <para>Since the testsuite largely depends on the host system kernel
223 configuration, some tests may fail. It also needs a modification in
224 order not to look for a program that will be installed by Util-Linux
225 package later in this chapter. To test the results, issue:</para>
226
227<screen><userinput remap="test">sed -i "s:minix:ext4:g" src/test/test-path-util.c
228make LD_LIBRARY_PATH=/tools/lib -k check</userinput></screen>
229
230 </sect2>
231
232 <sect2 id="contents-systemd" role="content">
233 <title>Contents of systemd</title>
234
235 <segmentedlist>
236 <segtitle>Installed programs</segtitle>
237 <segtitle>Installed libraries</segtitle>
238 <segtitle>Installed directories</segtitle>
239
240 <seglistitem>
241 <seg>bootctl, busctl, coredumpctl, halt, hostnamectl, init, journalctl,
242 kernel-install, localectl, loginctl, machinectl, networkctl, poweroff,
243 reboot, runlevel, shutdown, systemctl, systemd-analyze,
244 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
245 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
246 systemd-inhibit, systemd-machine-id-setup, systemd-notify,
247 systemd-nspawn, systemd-path, systemd-resolve, systemd-run,
248 systemd-stdio-bridge, systemd-tmpfiles, systemd-tty-ask-password-agent,
249 telinit, timedatectl, and udevadm</seg>
250 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
251 libnss_resolve.so.2, libsystemd.so, and libudev.so</seg>
252 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
253 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
254 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
255 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
256 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
257 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
258 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
259 </seglistitem>
260 </segmentedlist>
261
262 <variablelist>
263 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
264 <?dbfo list-presentation="list"?>
265 <?dbhtml list-presentation="table"?>
266
267 <varlistentry id="bootctl">
268 <term><command>bootctl</command></term>
269 <listitem>
270 <para>used to query the firmware and boot manager settings</para>
271 <indexterm zone="ch-system-systemd bootctl">
272 <primary sortas="b-bootctl">bootctl</primary>
273 </indexterm>
274 </listitem>
275 </varlistentry>
276
277 <varlistentry id="busctl">
278 <term><command>busctl</command></term>
279 <listitem>
280 <para>Used to introspect and monitor the D-Bus bus</para>
281 <indexterm zone="ch-system-systemd busctl">
282 <primary sortas="b-busctl">busctl</primary>
283 </indexterm>
284 </listitem>
285 </varlistentry>
286
287 <varlistentry id="coredumpctl">
288 <term><command>coredumpctl</command></term>
289 <listitem>
290 <para>Used to retrieve coredumps from the systemd Journal</para>
291 <indexterm zone="ch-system-systemd coredumpctl">
292 <primary sortas="b-coredumpctl">coredumpctl</primary>
293 </indexterm>
294 </listitem>
295 </varlistentry>
296
297 <varlistentry id="halt">
298 <term><command>halt</command></term>
299 <listitem>
300 <para>Normally invokes <command>shutdown</command> with the
301 <parameter>-h</parameter> option, except when already in run-level 0,
302 then it tells the kernel to halt the system; it notes in the
303 file <filename>/var/log/wtmp</filename> that the system is being
304 brought down</para>
305 <indexterm zone="ch-system-systemd halt">
306 <primary sortas="b-halt">halt</primary>
307 </indexterm>
308 </listitem>
309 </varlistentry>
310
311 <varlistentry id="hostnamectl">
312 <term><command>hostnamectl</command></term>
313 <listitem>
314 <para>Used to query and change the system hostname and related
315 settings</para>
316 <indexterm zone="ch-system-systemd hostnamectl">
317 <primary sortas="b-hostnamectl">hostnamectl</primary>
318 </indexterm>
319 </listitem>
320 </varlistentry>
321
322 <varlistentry id="init">
323 <term><command>init</command></term>
324 <listitem>
325 <para>The first process to be started when the kernel has initialized
326 the hardware which takes over the boot process and starts all the
327 proceses it is instructed to</para>
328 <indexterm zone="ch-system-systemd init">
329 <primary sortas="b-init">init</primary>
330 </indexterm>
331 </listitem>
332 </varlistentry>
333
334 <varlistentry id="journalctl">
335 <term><command>journalctl</command></term>
336 <listitem>
337 <para>Used to query the contents of the systemd Journal</para>
338 <indexterm zone="ch-system-systemd journalctl">
339 <primary sortas="b-journalctl">journalctl</primary>
340 </indexterm>
341 </listitem>
342 </varlistentry>
343
344 <varlistentry id="kernel-install">
345 <term><command>kernel-install</command></term>
346 <listitem>
347 <para>Used to add and remove kernel and initramfs images to and
348 from /boot</para>
349 <indexterm zone="ch-system-systemd kernel-install">
350 <primary sortas="b-kernel-install">kernel-install</primary>
351 </indexterm>
352 </listitem>
353 </varlistentry>
354
355 <varlistentry id="localectl">
356 <term><command>localectl</command></term>
357 <listitem>
358 <para>Used to query and change the system locale and keyboard layout
359 settings</para>
360 <indexterm zone="ch-system-systemd localectl">
361 <primary sortas="b-localectl">localectl</primary>
362 </indexterm>
363 </listitem>
364 </varlistentry>
365
366 <varlistentry id="loginctl">
367 <term><command>loginctl</command></term>
368 <listitem>
369 <para>Used to introspect and control the state of the systemd Login
370 Manager</para>
371 <indexterm zone="ch-system-systemd loginctl">
372 <primary sortas="b-loginctl">loginctl</primary>
373 </indexterm>
374 </listitem>
375 </varlistentry>
376
377 <varlistentry id="machinectl">
378 <term><command>machinectl</command></term>
379 <listitem>
380 <para>Used to introspect and control the state of the systemd Virtual
381 Machine and Container Registration Manager</para>
382 <indexterm zone="ch-system-systemd machinectl">
383 <primary sortas="b-machinectl">machinectl</primary>
384 </indexterm>
385 </listitem>
386 </varlistentry>
387
388 <varlistentry id="networkctl">
389 <term><command>networkctl</command></term>
390 <listitem>
391 <para>Used to introspect the state of the network links as seen by
392 systemd-networkd</para>
393 <indexterm zone="ch-system-systemd networkctl">
394 <primary sortas="b-networkctl">networkctl</primary>
395 </indexterm>
396 </listitem>
397 </varlistentry>
398
399 <varlistentry id="poweroff">
400 <term><command>poweroff</command></term>
401 <listitem>
402 <para>Tells the kernel to halt the system and switch off the computer
403 (see <command>halt</command>)</para>
404 <indexterm zone="ch-system-systemd poweroff">
405 <primary sortas="b-poweroff">poweroff</primary>
406 </indexterm>
407 </listitem>
408 </varlistentry>
409
410 <varlistentry id="reboot">
411 <term><command>reboot</command></term>
412 <listitem>
413 <para>Tells the kernel to reboot the system (see
414 <command>halt</command>)</para>
415 <indexterm zone="ch-system-systemd reboot">
416 <primary sortas="b-reboot">reboot</primary>
417 </indexterm>
418 </listitem>
419 </varlistentry>
420
421 <varlistentry id="runlevel">
422 <term><command>runlevel</command></term>
423 <listitem>
424 <para>Reports the previous and the current run-level, as noted in the
425 last run-level record in <filename>/var/run/utmp</filename></para>
426 <indexterm zone="ch-system-systemd runlevel">
427 <primary sortas="b-runlevel">runlevel</primary>
428 </indexterm>
429 </listitem>
430 </varlistentry>
431
432 <varlistentry id="shutdown">
433 <term><command>shutdown</command></term>
434 <listitem>
435 <para>Brings the system down in a secure way, signaling all processes
436 and notifying all logged-in users</para>
437 <indexterm zone="ch-system-systemd shutdown">
438 <primary sortas="b-shutdown">shutdown</primary>
439 </indexterm>
440 </listitem>
441 </varlistentry>
442
443 <varlistentry id="systemctl">
444 <term><command>systemctl</command></term>
445 <listitem>
446 <para>Used to introspect and control the state of the systemd system
447 and service manager</para>
448 <indexterm zone="ch-system-systemd systemctl">
449 <primary sortas="b-systemctl">systemctl</primary>
450 </indexterm>
451 </listitem>
452 </varlistentry>
453
454 <varlistentry id="systemd-analyze">
455 <term><command>systemd-analyze</command></term>
456 <listitem>
457 <para>Used to determine system boot-up performance of the current
458 boot</para>
459 <indexterm zone="ch-system-systemd systemd-analyze">
460 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
461 </indexterm>
462 </listitem>
463 </varlistentry>
464
465 <varlistentry id="systemd-ask-password">
466 <term><command>systemd-ask-password</command></term>
467 <listitem>
468 <para>Used to query a system password or passphrase from the user,
469 using a question message specified on the command line</para>
470 <indexterm zone="ch-system-systemd systemd-ask-password">
471 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
472 </indexterm>
473 </listitem>
474 </varlistentry>
475
476 <varlistentry id="systemd-cat">
477 <term><command>systemd-cat</command></term>
478 <listitem>
479 <para>Used to connect STDOUT and STDERR of a process with the Journal
480 </para>
481 <indexterm zone="ch-system-systemd systemd-cat">
482 <primary sortas="b-systemd-cat">systemd-cat</primary>
483 </indexterm>
484 </listitem>
485 </varlistentry>
486
487 <varlistentry id="systemd-cgls">
488 <term><command>systemd-cgls</command></term>
489 <listitem>
490 <para>Recursively shows the contents of the selected Linux control
491 group hierarchy in a tree</para>
492 <indexterm zone="ch-system-systemd systemd-cgls">
493 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
494 </indexterm>
495 </listitem>
496 </varlistentry>
497
498 <varlistentry id="systemd-cgtop">
499 <term><command>systemd-cgtop</command></term>
500 <listitem>
501 <para>Shows the top control groups of the local Linux control group
502 hierarchy, ordered by their CPU, memory and disk I/O load</para>
503 <indexterm zone="ch-system-systemd systemd-cgtop">
504 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
505 </indexterm>
506 </listitem>
507 </varlistentry>
508
509 <varlistentry id="systemd-delta">
510 <term><command>systemd-delta</command></term>
511 <listitem>
512 <para>Used to identify and compare configuration files in
513 <filename class="directory">/etc</filename> that override default
514 counterparts in <filename class="directory">/usr</filename></para>
515 <indexterm zone="ch-system-systemd systemd-delta">
516 <primary sortas="b-systemd-delta">systemd-delta</primary>
517 </indexterm>
518 </listitem>
519 </varlistentry>
520
521 <varlistentry id="systemd-detect-virt">
522 <term><command>systemd-detect-virt</command></term>
523 <listitem>
524 <para>Detects execution in a virtualized environment</para>
525 <indexterm zone="ch-system-systemd systemd-detect-virt">
526 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
527 </indexterm>
528 </listitem>
529 </varlistentry>
530
531 <varlistentry id="systemd-escape">
532 <term><command>systemd-escape</command></term>
533 <listitem>
534 <para>Used to escape strings for inclusion in systemd unit
535 names</para>
536 <indexterm zone="ch-system-systemd systemd-escape">
537 <primary sortas="b-systemd-escape">systemd-escape</primary>
538 </indexterm>
539 </listitem>
540 </varlistentry>
541
542 <varlistentry id="systemd-hwdb">
543 <term><command>systemd-hwdb</command></term>
544 <listitem>
545 <para>Used to manage hardware database (hwdb)</para>
546 <indexterm zone="ch-system-systemd systemd-hwdb">
547 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
548 </indexterm>
549 </listitem>
550 </varlistentry>
551
552 <varlistentry id="systemd-inhibit">
553 <term><command>systemd-inhibit</command></term>
554 <listitem>
555 <para>Used to execute a program with a shutdown, sleep or idle
556 inhibitor lock taken</para>
557 <indexterm zone="ch-system-systemd systemd-inhibit">
558 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
559 </indexterm>
560 </listitem>
561 </varlistentry>
562
563 <varlistentry id="systemd-machine-id-setup">
564 <term><command>systemd-machine-id-setup</command></term>
565 <listitem>
566 <para>Used by system installer tools to initialize the machine ID
567 stored in <filename>/etc/machine-id</filename> at install time with a
568 randomly generated ID</para>
569 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
570 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
571 </indexterm>
572 </listitem>
573 </varlistentry>
574
575 <varlistentry id="systemd-notify">
576 <term><command>systemd-notify</command></term>
577 <listitem>
578 <para>Used by daemon scripts to notify the init system about status
579 changes</para>
580 <indexterm zone="ch-system-systemd systemd-notify">
581 <primary sortas="b-systemd-notify">systemd-notify</primary>
582 </indexterm>
583 </listitem>
584 </varlistentry>
585
586 <varlistentry id="systemd-nspawn">
587 <term><command>systemd-nspawn</command></term>
588 <listitem>
589 <para>Used to run a command or OS in a light-weight namespace
590 container</para>
591 <indexterm zone="ch-system-systemd systemd-nspawn">
592 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
593 </indexterm>
594 </listitem>
595 </varlistentry>
596
597 <varlistentry id="systemd-path">
598 <term><command>systemd-path</command></term>
599 <listitem>
600 <para>Used to query system and user paths</para>
601 <indexterm zone="ch-system-systemd systemd-path">
602 <primary sortas="b-systemd-path">systemd-path</primary>
603 </indexterm>
604 </listitem>
605 </varlistentry>
606
607 <varlistentry id="systemd-resolve">
608 <term><command>systemd-resolve</command></term>
609 <listitem>
610 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
611 resource records, and services</para>
612 <indexterm zone="ch-system-systemd systemd-resolve">
613 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
614 </indexterm>
615 </listitem>
616 </varlistentry>
617
618 <varlistentry id="systemd-run">
619 <term><command>systemd-run</command></term>
620 <listitem>
621 <para>Used to create and start a transient .service or a .scope unit
622 and run the specified command in it</para>
623 <indexterm zone="ch-system-systemd systemd-run">
624 <primary sortas="b-systemd-run">systemd-run</primary>
625 </indexterm>
626 </listitem>
627 </varlistentry>
628
629 <!-- <varlistentry id="systemd-stdio-bridge">
630 <term><command>systemd-stdio-bridge</command></term>
631 <listitem>
632 <para>To be completed</para>
633 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
634 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
635 </indexterm>
636 </listitem>
637 </varlistentry> -->
638
639 <varlistentry id="systemd-tmpfiles">
640 <term><command>systemd-tmpfiles</command></term>
641 <listitem>
642 <para>Creates, deletes and cleans up volatile and temporary files and
643 directories, based on the configuration file format and location
644 specified in
645 <filename class="directory">tmpfiles.d</filename> directories</para>
646 <indexterm zone="ch-system-systemd systemd-tmpfiles">
647 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
648 </indexterm>
649 </listitem>
650 </varlistentry>
651
652 <varlistentry id="systemd-tty-ask-password-agent">
653 <term><command>systemd-tty-ask-password-agent</command></term>
654 <listitem>
655 <para>Used to list or process pending systemd password requests</para>
656 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
657 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
658 </indexterm>
659 </listitem>
660 </varlistentry>
661
662 <varlistentry id="telinit">
663 <term><command>telinit</command></term>
664 <listitem>
665 <para>Tells <command>init</command> which run-level to change
666 to</para>
667 <indexterm zone="ch-system-systemd telinit">
668 <primary sortas="b-telinit">telinit</primary>
669 </indexterm>
670 </listitem>
671 </varlistentry>
672
673 <varlistentry id="timedatectl">
674 <term><command>timedatectl</command></term>
675 <listitem>
676 <para>Used to query and change the system clock and its settings
677 </para>
678 <indexterm zone="ch-system-systemd timedatectl">
679 <primary sortas="b-timedatectl">timedatectl</primary>
680 </indexterm>
681 </listitem>
682 </varlistentry>
683
684 <varlistentry id="udevadm">
685 <term><command>udevadm</command></term>
686 <listitem>
687 <para>Generic Udev administration tool: controls the udevd daemon,
688 provides info from the Udev database, monitors uevents, waits for
689 uevents to finish, tests Udev configuration, and triggers uevents
690 for a given device</para>
691 <indexterm zone="ch-system-systemd udevadm">
692 <primary sortas="b-udevadm">udevadm</primary>
693 </indexterm>
694 </listitem>
695 </varlistentry>
696
697 <varlistentry id="libsystemd">
698 <term><filename class="libraryfile">libsystemd</filename></term>
699 <listitem>
700 <para>systemd utility library</para>
701 <indexterm zone="ch-system-systemd libsystemd">
702 <primary sortas="c-libsystemd">libsystemd</primary>
703 </indexterm>
704 </listitem>
705 </varlistentry>
706
707 <varlistentry id="libudev">
708 <term><filename class="libraryfile">libudev</filename></term>
709 <listitem>
710 <para>A library to access Udev device information</para>
711 <indexterm zone="ch-system-systemd libudev">
712 <primary sortas="c-libudev">libudev</primary>
713 </indexterm>
714 </listitem>
715 </varlistentry>
716
717 </variablelist>
718
719 </sect2>
720
721</sect1>
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