source: chapter06/systemd.xml@ e053117

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Last change on this file since e053117 was e053117, checked in by DJ Lucas <dj@…>, 7 years ago

Moved /etc/resolv.conf symlink to Chapter 7.

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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/::" $(grep -rl "blkid/blkid.h")</userinput></screen>
47
48<!-- Not needed as of 231. -renodr
49 <para>Fix a potential security issue with framebuffer devices:</para>
50
51<screen><userinput remap="pre">sed -e 's@DRI and frame buffer@DRI@' \
52 -e '/SUBSYSTEM==\"graphics\", KERNEL==\"fb\*\"/d' \
53 -i src/login/70-uaccess.rules</userinput></screen>
54-->
55
56 <para>Disable two tests that always fail:</para>
57
58<screen><userinput remap="pre">sed -e 's@test/udev-test.pl @@' \
59 -e 's@test-copy$(EXEEXT) @@' \
60 -i Makefile.in</userinput></screen>
61
62 <para>Apply a patch to fix a security issue:</para>
63
64<screen><userinput remap="pre">patch -Np1 -i ../systemd-231-security_fix-1.patch</userinput></screen>
65
66 <para>Create a file to allow systemd to build when using Util-Linux
67 built in Chapter 5, to disable LTO by default, and to build without
68 xlstproc:</para>
69
70<screen><userinput remap="pre">cat &gt; config.cache &lt;&lt; "EOF"
71<literal>KILL=/bin/kill
72MOUNT_PATH=/bin/mount
73UMOUNT_PATH=/bin/umount
74HAVE_BLKID=1
75BLKID_LIBS="-lblkid"
76BLKID_CFLAGS="-I/tools/include/blkid"
77HAVE_LIBMOUNT=1
78MOUNT_LIBS="-lmount"
79MOUNT_CFLAGS="-I/tools/include/libmount"
80cc_cv_CFLAGS__flto=no
81XSLTPROC="/usr/bin/xsltproc"</literal>
82EOF</userinput></screen>
83
84 <para>LTO is disabled by default because it causes
85 <command>systemd</command> and other auxiliary programs to link to
86 <filename class="libraryfile">libgcc_s.so</filename>, slows the build down
87 and makes the compiled code larger.</para>
88
89 <para>Prepare systemd for compilation:</para>
90
91<screen><userinput remap="configure">./configure --prefix=/usr \
92 --sysconfdir=/etc \
93 --localstatedir=/var \
94 --config-cache \
95 --with-rootprefix= \
96 --with-rootlibdir=/lib \
97 --enable-split-usr \
98 --disable-firstboot \
99 --disable-ldconfig \
100 --disable-sysusers \
101 --without-python \
102 --with-default-dnssec=no \
103 --docdir=/usr/share/doc/systemd-&systemd-version;</userinput></screen>
104
105 <variablelist>
106 <title>The meaning of the configure options:</title>
107
108 <varlistentry>
109 <term><parameter>--config-cache</parameter></term>
110 <listitem>
111 <para>This switch tells the build system to use
112 the <filename>config.cache</filename> file which
113 was created earlier.</para>
114 </listitem>
115 </varlistentry>
116
117 <varlistentry>
118 <term><parameter>--with-root*</parameter></term>
119 <listitem>
120 <para>These switches ensure that core programs and
121 shared libraries are installed in the subdirectories
122 of the root partition.</para>
123 </listitem>
124 </varlistentry>
125
126 <varlistentry>
127 <term><parameter>--enable-split-usr</parameter></term>
128 <listitem>
129 <para>This switch ensures that systemd will work on
130 systems where /bin, /lib and /sbin directories are not
131 symlinks to their /usr counterparts.</para>
132 </listitem>
133 </varlistentry>
134
135 <varlistentry>
136 <term><parameter>--without-python</parameter></term>
137 <listitem>
138 <para>This switch prevents <command>configure</command>
139 from trying to use Python which isn't built
140 in LFS.</para>
141 </listitem>
142 </varlistentry>
143
144 <varlistentry>
145 <term><parameter>--disable-firstboot</parameter></term>
146 <listitem>
147 <para>This switch prevents installation of systemd
148 services responsible for setting up the system for
149 the first time. They are not useful for LFS because
150 everything is done manually.</para>
151 </listitem>
152 </varlistentry>
153
154 <varlistentry>
155 <term><parameter>--disable-ldconfig</parameter></term>
156 <listitem>
157 <para>This switch prevents installation of a systemd
158 unit that runs <command>ldconfig</command> at
159 boot, making the boot time longer. Remove it if the
160 described feature is desired, even though it's not
161 useful for source distributions such as LFS.</para>
162 </listitem>
163 </varlistentry>
164
165 <varlistentry>
166 <term><parameter>--disable-sysusers</parameter></term>
167 <listitem>
168 <para>This switch prevents installation of systemd
169 services responsible for setting up the
170 <filename>/etc/group</filename> and
171 <filename>/etc/passwd</filename> files. Both files
172 were created early in this chapter.</para>
173 </listitem>
174 </varlistentry>
175
176 <varlistentry>
177 <term><parameter>--with-default-dnssec=no</parameter></term>
178 <listitem>
179 <para>This switch turns off the experimental DNSSEC suport.</para>
180 </listitem>
181 </varlistentry>
182
183 </variablelist>
184
185 <para>Compile the package:</para>
186
187<screen><userinput remap="make">make LIBRARY_PATH=/tools/lib</userinput></screen>
188
189 <para>This package has a test suite, but it can only be run after the
190 package has been installed.</para>
191
192 <para>Install the package:</para>
193
194<screen><userinput remap="install">make LD_LIBRARY_PATH=/tools/lib install</userinput></screen>
195
196 <para>Move the NSS libraries to <filename class="directory">/lib</filename>:</para>
197
198<screen><userinput remap="install">mv -v /usr/lib/libnss_{myhostname,mymachines,resolve}.so.2 /lib</userinput></screen>
199
200 <para>Remove an unnecessary directory:</para>
201
202<screen><userinput remap="install">rm -rfv /usr/lib/rpm</userinput></screen>
203
204 <para>Create the Sysvinit compatibility symlinks, so systemd is used
205 as the default init system:</para>
206
207<screen><userinput remap="install">for tool in runlevel reboot shutdown poweroff halt telinit; do
208 ln -sfv ../bin/systemctl /sbin/${tool}
209done
210ln -sfv ../lib/systemd/systemd /sbin/init</userinput></screen>
211
212<!--
213 <para>Remove a reference to a non-existent group:</para>
214
215<screen><userinput remap="install">sed -i "s:0775 root lock:0755 root root:g" /usr/lib/tmpfiles.d/legacy.conf</userinput></screen>
216-->
217
218 <para>Create the <filename>/etc/machine-id</filename> file needed by
219 <command>systemd-journald</command>:</para>
220
221<screen><userinput remap="install">systemd-machine-id-setup</userinput></screen>
222
223 <para>Since the testsuite largely depends on the host system kernel
224 configuration, some tests may fail. It also needs a modification in
225 order not to look for a program that will be installed by Util-Linux
226 package later in this chapter. To test the results, issue:</para>
227
228<screen><userinput remap="test">sed -i "s:minix:ext4:g" src/test/test-path-util.c
229make LD_LIBRARY_PATH=/tools/lib -k check</userinput></screen>
230
231 </sect2>
232
233 <sect2 id="contents-systemd" role="content">
234 <title>Contents of systemd</title>
235
236 <segmentedlist>
237 <segtitle>Installed programs</segtitle>
238 <segtitle>Installed libraries</segtitle>
239 <segtitle>Installed directories</segtitle>
240
241 <seglistitem>
242 <seg>bootctl, busctl, coredumpctl, halt, hostnamectl, init, journalctl,
243 kernel-install, localectl, loginctl, machinectl, networkctl, poweroff,
244 reboot, runlevel, shutdown, systemctl, systemd-analyze,
245 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
246 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
247 systemd-inhibit, systemd-machine-id-setup, systemd-notify,
248 systemd-nspawn, systemd-path, systemd-resolve, systemd-run,
249 systemd-stdio-bridge, systemd-tmpfiles, systemd-tty-ask-password-agent,
250 telinit, timedatectl, and udevadm</seg>
251 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
252 libnss_resolve.so.2, libsystemd.so, libsystemd-shared-231.so,
253 and libudev.so</seg>
254 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
255 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
256 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
257 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
258 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
259 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
260 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
261 </seglistitem>
262 </segmentedlist>
263
264 <variablelist>
265 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
266 <?dbfo list-presentation="list"?>
267 <?dbhtml list-presentation="table"?>
268
269 <varlistentry id="bootctl">
270 <term><command>bootctl</command></term>
271 <listitem>
272 <para>used to query the firmware and boot manager settings</para>
273 <indexterm zone="ch-system-systemd bootctl">
274 <primary sortas="b-bootctl">bootctl</primary>
275 </indexterm>
276 </listitem>
277 </varlistentry>
278
279 <varlistentry id="busctl">
280 <term><command>busctl</command></term>
281 <listitem>
282 <para>Used to introspect and monitor the D-Bus bus</para>
283 <indexterm zone="ch-system-systemd busctl">
284 <primary sortas="b-busctl">busctl</primary>
285 </indexterm>
286 </listitem>
287 </varlistentry>
288
289 <varlistentry id="coredumpctl">
290 <term><command>coredumpctl</command></term>
291 <listitem>
292 <para>Used to retrieve coredumps from the systemd Journal</para>
293 <indexterm zone="ch-system-systemd coredumpctl">
294 <primary sortas="b-coredumpctl">coredumpctl</primary>
295 </indexterm>
296 </listitem>
297 </varlistentry>
298
299 <varlistentry id="halt">
300 <term><command>halt</command></term>
301 <listitem>
302 <para>Normally invokes <command>shutdown</command> with the
303 <parameter>-h</parameter> option, except when already in run-level 0,
304 then it tells the kernel to halt the system; it notes in the
305 file <filename>/var/log/wtmp</filename> that the system is being
306 brought down</para>
307 <indexterm zone="ch-system-systemd halt">
308 <primary sortas="b-halt">halt</primary>
309 </indexterm>
310 </listitem>
311 </varlistentry>
312
313 <varlistentry id="hostnamectl">
314 <term><command>hostnamectl</command></term>
315 <listitem>
316 <para>Used to query and change the system hostname and related
317 settings</para>
318 <indexterm zone="ch-system-systemd hostnamectl">
319 <primary sortas="b-hostnamectl">hostnamectl</primary>
320 </indexterm>
321 </listitem>
322 </varlistentry>
323
324 <varlistentry id="init">
325 <term><command>init</command></term>
326 <listitem>
327 <para>The first process to be started when the kernel has initialized
328 the hardware which takes over the boot process and starts all the
329 proceses it is instructed to</para>
330 <indexterm zone="ch-system-systemd init">
331 <primary sortas="b-init">init</primary>
332 </indexterm>
333 </listitem>
334 </varlistentry>
335
336 <varlistentry id="journalctl">
337 <term><command>journalctl</command></term>
338 <listitem>
339 <para>Used to query the contents of the systemd Journal</para>
340 <indexterm zone="ch-system-systemd journalctl">
341 <primary sortas="b-journalctl">journalctl</primary>
342 </indexterm>
343 </listitem>
344 </varlistentry>
345
346 <varlistentry id="kernel-install">
347 <term><command>kernel-install</command></term>
348 <listitem>
349 <para>Used to add and remove kernel and initramfs images to and
350 from /boot</para>
351 <indexterm zone="ch-system-systemd kernel-install">
352 <primary sortas="b-kernel-install">kernel-install</primary>
353 </indexterm>
354 </listitem>
355 </varlistentry>
356
357 <varlistentry id="localectl">
358 <term><command>localectl</command></term>
359 <listitem>
360 <para>Used to query and change the system locale and keyboard layout
361 settings</para>
362 <indexterm zone="ch-system-systemd localectl">
363 <primary sortas="b-localectl">localectl</primary>
364 </indexterm>
365 </listitem>
366 </varlistentry>
367
368 <varlistentry id="loginctl">
369 <term><command>loginctl</command></term>
370 <listitem>
371 <para>Used to introspect and control the state of the systemd Login
372 Manager</para>
373 <indexterm zone="ch-system-systemd loginctl">
374 <primary sortas="b-loginctl">loginctl</primary>
375 </indexterm>
376 </listitem>
377 </varlistentry>
378
379 <varlistentry id="machinectl">
380 <term><command>machinectl</command></term>
381 <listitem>
382 <para>Used to introspect and control the state of the systemd Virtual
383 Machine and Container Registration Manager</para>
384 <indexterm zone="ch-system-systemd machinectl">
385 <primary sortas="b-machinectl">machinectl</primary>
386 </indexterm>
387 </listitem>
388 </varlistentry>
389
390 <varlistentry id="networkctl">
391 <term><command>networkctl</command></term>
392 <listitem>
393 <para>Used to introspect the state of the network links as seen by
394 systemd-networkd</para>
395 <indexterm zone="ch-system-systemd networkctl">
396 <primary sortas="b-networkctl">networkctl</primary>
397 </indexterm>
398 </listitem>
399 </varlistentry>
400
401 <varlistentry id="poweroff">
402 <term><command>poweroff</command></term>
403 <listitem>
404 <para>Tells the kernel to halt the system and switch off the computer
405 (see <command>halt</command>)</para>
406 <indexterm zone="ch-system-systemd poweroff">
407 <primary sortas="b-poweroff">poweroff</primary>
408 </indexterm>
409 </listitem>
410 </varlistentry>
411
412 <varlistentry id="reboot">
413 <term><command>reboot</command></term>
414 <listitem>
415 <para>Tells the kernel to reboot the system (see
416 <command>halt</command>)</para>
417 <indexterm zone="ch-system-systemd reboot">
418 <primary sortas="b-reboot">reboot</primary>
419 </indexterm>
420 </listitem>
421 </varlistentry>
422
423 <varlistentry id="runlevel">
424 <term><command>runlevel</command></term>
425 <listitem>
426 <para>Reports the previous and the current run-level, as noted in the
427 last run-level record in <filename>/var/run/utmp</filename></para>
428 <indexterm zone="ch-system-systemd runlevel">
429 <primary sortas="b-runlevel">runlevel</primary>
430 </indexterm>
431 </listitem>
432 </varlistentry>
433
434 <varlistentry id="shutdown">
435 <term><command>shutdown</command></term>
436 <listitem>
437 <para>Brings the system down in a secure way, signaling all processes
438 and notifying all logged-in users</para>
439 <indexterm zone="ch-system-systemd shutdown">
440 <primary sortas="b-shutdown">shutdown</primary>
441 </indexterm>
442 </listitem>
443 </varlistentry>
444
445 <varlistentry id="systemctl">
446 <term><command>systemctl</command></term>
447 <listitem>
448 <para>Used to introspect and control the state of the systemd system
449 and service manager</para>
450 <indexterm zone="ch-system-systemd systemctl">
451 <primary sortas="b-systemctl">systemctl</primary>
452 </indexterm>
453 </listitem>
454 </varlistentry>
455
456 <varlistentry id="systemd-analyze">
457 <term><command>systemd-analyze</command></term>
458 <listitem>
459 <para>Used to determine system boot-up performance of the current
460 boot</para>
461 <indexterm zone="ch-system-systemd systemd-analyze">
462 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
463 </indexterm>
464 </listitem>
465 </varlistentry>
466
467 <varlistentry id="systemd-ask-password">
468 <term><command>systemd-ask-password</command></term>
469 <listitem>
470 <para>Used to query a system password or passphrase from the user,
471 using a question message specified on the command line</para>
472 <indexterm zone="ch-system-systemd systemd-ask-password">
473 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
474 </indexterm>
475 </listitem>
476 </varlistentry>
477
478 <varlistentry id="systemd-cat">
479 <term><command>systemd-cat</command></term>
480 <listitem>
481 <para>Used to connect STDOUT and STDERR of a process with the Journal
482 </para>
483 <indexterm zone="ch-system-systemd systemd-cat">
484 <primary sortas="b-systemd-cat">systemd-cat</primary>
485 </indexterm>
486 </listitem>
487 </varlistentry>
488
489 <varlistentry id="systemd-cgls">
490 <term><command>systemd-cgls</command></term>
491 <listitem>
492 <para>Recursively shows the contents of the selected Linux control
493 group hierarchy in a tree</para>
494 <indexterm zone="ch-system-systemd systemd-cgls">
495 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
496 </indexterm>
497 </listitem>
498 </varlistentry>
499
500 <varlistentry id="systemd-cgtop">
501 <term><command>systemd-cgtop</command></term>
502 <listitem>
503 <para>Shows the top control groups of the local Linux control group
504 hierarchy, ordered by their CPU, memory and disk I/O load</para>
505 <indexterm zone="ch-system-systemd systemd-cgtop">
506 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
507 </indexterm>
508 </listitem>
509 </varlistentry>
510
511 <varlistentry id="systemd-delta">
512 <term><command>systemd-delta</command></term>
513 <listitem>
514 <para>Used to identify and compare configuration files in
515 <filename class="directory">/etc</filename> that override default
516 counterparts in <filename class="directory">/usr</filename></para>
517 <indexterm zone="ch-system-systemd systemd-delta">
518 <primary sortas="b-systemd-delta">systemd-delta</primary>
519 </indexterm>
520 </listitem>
521 </varlistentry>
522
523 <varlistentry id="systemd-detect-virt">
524 <term><command>systemd-detect-virt</command></term>
525 <listitem>
526 <para>Detects execution in a virtualized environment</para>
527 <indexterm zone="ch-system-systemd systemd-detect-virt">
528 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
529 </indexterm>
530 </listitem>
531 </varlistentry>
532
533 <varlistentry id="systemd-escape">
534 <term><command>systemd-escape</command></term>
535 <listitem>
536 <para>Used to escape strings for inclusion in systemd unit
537 names</para>
538 <indexterm zone="ch-system-systemd systemd-escape">
539 <primary sortas="b-systemd-escape">systemd-escape</primary>
540 </indexterm>
541 </listitem>
542 </varlistentry>
543
544 <varlistentry id="systemd-hwdb">
545 <term><command>systemd-hwdb</command></term>
546 <listitem>
547 <para>Used to manage hardware database (hwdb)</para>
548 <indexterm zone="ch-system-systemd systemd-hwdb">
549 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
550 </indexterm>
551 </listitem>
552 </varlistentry>
553
554 <varlistentry id="systemd-inhibit">
555 <term><command>systemd-inhibit</command></term>
556 <listitem>
557 <para>Used to execute a program with a shutdown, sleep or idle
558 inhibitor lock taken</para>
559 <indexterm zone="ch-system-systemd systemd-inhibit">
560 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
561 </indexterm>
562 </listitem>
563 </varlistentry>
564
565 <varlistentry id="systemd-machine-id-setup">
566 <term><command>systemd-machine-id-setup</command></term>
567 <listitem>
568 <para>Used by system installer tools to initialize the machine ID
569 stored in <filename>/etc/machine-id</filename> at install time with a
570 randomly generated ID</para>
571 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
572 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
573 </indexterm>
574 </listitem>
575 </varlistentry>
576
577 <varlistentry id="systemd-notify">
578 <term><command>systemd-notify</command></term>
579 <listitem>
580 <para>Used by daemon scripts to notify the init system about status
581 changes</para>
582 <indexterm zone="ch-system-systemd systemd-notify">
583 <primary sortas="b-systemd-notify">systemd-notify</primary>
584 </indexterm>
585 </listitem>
586 </varlistentry>
587
588 <varlistentry id="systemd-nspawn">
589 <term><command>systemd-nspawn</command></term>
590 <listitem>
591 <para>Used to run a command or OS in a light-weight namespace
592 container</para>
593 <indexterm zone="ch-system-systemd systemd-nspawn">
594 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
595 </indexterm>
596 </listitem>
597 </varlistentry>
598
599 <varlistentry id="systemd-path">
600 <term><command>systemd-path</command></term>
601 <listitem>
602 <para>Used to query system and user paths</para>
603 <indexterm zone="ch-system-systemd systemd-path">
604 <primary sortas="b-systemd-path">systemd-path</primary>
605 </indexterm>
606 </listitem>
607 </varlistentry>
608
609 <varlistentry id="systemd-resolve">
610 <term><command>systemd-resolve</command></term>
611 <listitem>
612 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
613 resource records, and services</para>
614 <indexterm zone="ch-system-systemd systemd-resolve">
615 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
616 </indexterm>
617 </listitem>
618 </varlistentry>
619
620 <varlistentry id="systemd-run">
621 <term><command>systemd-run</command></term>
622 <listitem>
623 <para>Used to create and start a transient .service or a .scope unit
624 and run the specified command in it</para>
625 <indexterm zone="ch-system-systemd systemd-run">
626 <primary sortas="b-systemd-run">systemd-run</primary>
627 </indexterm>
628 </listitem>
629 </varlistentry>
630
631 <!-- <varlistentry id="systemd-stdio-bridge">
632 <term><command>systemd-stdio-bridge</command></term>
633 <listitem>
634 <para>To be completed</para>
635 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
636 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
637 </indexterm>
638 </listitem>
639 </varlistentry> -->
640
641 <varlistentry id="systemd-tmpfiles">
642 <term><command>systemd-tmpfiles</command></term>
643 <listitem>
644 <para>Creates, deletes and cleans up volatile and temporary files and
645 directories, based on the configuration file format and location
646 specified in
647 <filename class="directory">tmpfiles.d</filename> directories</para>
648 <indexterm zone="ch-system-systemd systemd-tmpfiles">
649 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
650 </indexterm>
651 </listitem>
652 </varlistentry>
653
654 <varlistentry id="systemd-tty-ask-password-agent">
655 <term><command>systemd-tty-ask-password-agent</command></term>
656 <listitem>
657 <para>Used to list or process pending systemd password requests</para>
658 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
659 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
660 </indexterm>
661 </listitem>
662 </varlistentry>
663
664 <varlistentry id="telinit">
665 <term><command>telinit</command></term>
666 <listitem>
667 <para>Tells <command>init</command> which run-level to change
668 to</para>
669 <indexterm zone="ch-system-systemd telinit">
670 <primary sortas="b-telinit">telinit</primary>
671 </indexterm>
672 </listitem>
673 </varlistentry>
674
675 <varlistentry id="timedatectl">
676 <term><command>timedatectl</command></term>
677 <listitem>
678 <para>Used to query and change the system clock and its settings
679 </para>
680 <indexterm zone="ch-system-systemd timedatectl">
681 <primary sortas="b-timedatectl">timedatectl</primary>
682 </indexterm>
683 </listitem>
684 </varlistentry>
685
686 <varlistentry id="udevadm">
687 <term><command>udevadm</command></term>
688 <listitem>
689 <para>Generic Udev administration tool: controls the udevd daemon,
690 provides info from the Udev database, monitors uevents, waits for
691 uevents to finish, tests Udev configuration, and triggers uevents
692 for a given device</para>
693 <indexterm zone="ch-system-systemd udevadm">
694 <primary sortas="b-udevadm">udevadm</primary>
695 </indexterm>
696 </listitem>
697 </varlistentry>
698
699 <varlistentry id="libsystemd">
700 <term><filename class="libraryfile">libsystemd</filename></term>
701 <listitem>
702 <para>systemd utility library</para>
703 <indexterm zone="ch-system-systemd libsystemd">
704 <primary sortas="c-libsystemd">libsystemd</primary>
705 </indexterm>
706 </listitem>
707 </varlistentry>
708
709 <varlistentry id="libudev">
710 <term><filename class="libraryfile">libudev</filename></term>
711 <listitem>
712 <para>A library to access Udev device information</para>
713 <indexterm zone="ch-system-systemd libudev">
714 <primary sortas="c-libudev">libudev</primary>
715 </indexterm>
716 </listitem>
717 </varlistentry>
718
719 </variablelist>
720
721 </sect2>
722
723</sect1>
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