source: chapter06/systemd.xml@ f7cea72

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Last change on this file since f7cea72 was f7cea72, checked in by Douglas R. Reno <renodr@…>, 3 years ago

Update to systemd-240
Update to linux-4.19.12 (Not doing 4.20 yet)
Update to e2fsprogs-1.44.5
Update to bison-3.2.4
Update to sed-4.7
Update to grep-3.3
Update to Python-3.7.2
Update to groff-1.22.4

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11495 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 symlink to work around missing xsltproc:</para>
44
45<screen><userinput remap="pre">ln -sf /tools/bin/true /usr/bin/xsltproc</userinput></screen>
46
47 <para>Because we have not yet installed the final version of Util-Linux,
48 create links to the libraries in the approprite location:</para>
49
50<screen><userinput remap="pre">for file in /tools/lib/lib{blkid,mount,uuid}*; do
51 ln -sf $file /usr/lib/
52done</userinput></screen>
53
54 <para>Set up the man pages:</para>
55
56<screen><userinput remap="pre">tar -xf ../systemd-man-pages-&systemd-version;.tar.xz</userinput></screen>
57
58 <para>Remove tests that cannot be built in chroot:</para>
59
60<screen><userinput remap="pre">sed '177,$ d' -i src/resolve/meson.build</userinput></screen>
61
62 <para>Remove an unneeded group,
63 <systemitem class="groupname">render</systemitem>, from the default udev
64 rules:</para>
65
66<screen><userinput remap="pre">sed -i 's/GROUP="render", //' rules/50-udev-default.rules.in</userinput></screen>
67
68 <para>Prepare systemd for compilation:</para>
69
70 <screen><userinput remap="configure">mkdir -p build
71cd build
72
73PKG_CONFIG_PATH="/usr/lib/pkgconfig:/tools/lib/pkgconfig" \
74LANG=en_US.UTF-8 \
75meson --prefix=/usr \
76 --sysconfdir=/etc \
77 --localstatedir=/var \
78 -Dblkid=true \
79 -Dbuildtype=release \
80 -Ddefault-dnssec=no \
81 -Dfirstboot=false \
82 -Dinstall-tests=false \
83 -Dkill-path=/bin/kill \
84 -Dkmod-path=/bin/kmod \
85 -Dldconfig=false \
86 -Dmount-path=/bin/mount \
87 -Drootprefix= \
88 -Drootlibdir=/lib \
89 -Dsplit-usr=true \
90 -Dsulogin-path=/sbin/sulogin \
91 -Dsysusers=false \
92 -Dumount-path=/bin/umount \
93 -Db_lto=false \
94 ..</userinput></screen>
95
96 <variablelist>
97 <title>The meaning of the meson options:</title>
98
99 <varlistentry>
100 <term><parameter>-D*-path=*</parameter></term>
101 <listitem>
102 <para>These switches provide location of binaries needed by
103 systemd at runtime that have not yet been installed, or who's
104 pkgconfig files are currently only in
105 <filename>/tools/lib/pkgconfig</filename>.</para>
106 </listitem>
107 </varlistentry>
108
109 <varlistentry>
110 <term><parameter>-Ddefault-dnssec=no</parameter></term>
111 <listitem>
112 <para>This switch turns off the experimental DNSSEC support.</para>
113 </listitem>
114 </varlistentry>
115
116 <varlistentry>
117 <term><parameter>-Dfirstboot=false</parameter></term>
118 <listitem>
119 <para>This switch prevents installation of systemd
120 services responsible for setting up the system for
121 the first time. They are not useful for LFS because
122 everything is done manually.</para>
123 </listitem>
124 </varlistentry>
125
126 <varlistentry>
127 <term><parameter>-Dinstall-tests=false</parameter></term>
128 <listitem>
129 <para>This switch prevents installation of the compiled tests.</para>
130 </listitem>
131 </varlistentry>
132
133 <varlistentry>
134 <term><parameter>-Dldconfig=false</parameter></term>
135 <listitem>
136 <para>This switch prevents installation of a systemd unit that runs
137 <command>ldconfig</command> at boot, which is not useful for source
138 distributions such as LFS and makes the boot time longer. Remove it
139 if the described feature is desired.</para>
140 </listitem>
141 </varlistentry>
142
143 <varlistentry>
144 <term><parameter>-Droot*</parameter></term>
145 <listitem>
146 <para>These switches ensure that core programs and
147 shared libraries are installed in the subdirectories
148 of the root partition.</para>
149 </listitem>
150 </varlistentry>
151
152 <varlistentry>
153 <term><parameter>-Dsplit-usr=true</parameter></term>
154 <listitem>
155 <para>This switch ensures that systemd will work on
156 systems where /bin, /lib and /sbin directories are not
157 symlinks to their /usr counterparts.</para>
158 </listitem>
159 </varlistentry>
160
161 <varlistentry>
162 <term><parameter>-Dsysusers=false</parameter></term>
163 <listitem>
164 <para>This switch prevents installation of systemd
165 services responsible for setting up the
166 <filename>/etc/group</filename> and
167 <filename>/etc/passwd</filename> files. Both files
168 were created earlier in this chapter.</para>
169 </listitem>
170 </varlistentry>
171
172 </variablelist>
173
174 <para>Compile the package:</para>
175
176<screen><userinput remap="make">LANG=en_US.UTF-8 ninja</userinput></screen>
177<!--
178 <para>To test the package, execute the following command:</para>
179
180<screen><userinput remap="test">LANG=en_US.UTF-8 ninja test</userinput></screen>
181-->
182 <para>Install the package:</para>
183
184<screen><userinput remap="install">LANG=en_US.UTF-8 ninja install</userinput></screen>
185
186 <para>Remove an unnecessary directory:</para>
187
188<screen><userinput remap="install">rm -rfv /usr/lib/rpm
189rm -f /usr/bin/xsltproc</userinput></screen>
190
191 <para>Create the <filename>/etc/machine-id</filename> file needed by
192 <command>systemd-journald</command>:</para>
193
194<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
195
196 <para>Create the <filename>/lib/systemd/systemd-user-sessions</filename>
197 script to allow unprivileged user logins without
198 <application>systemd-logind</application>:</para>
199
200<screen><userinput remap="adjust">cat &gt; /lib/systemd/systemd-user-sessions &lt;&lt; "EOF"
201#!/bin/bash
202rm -f /run/nologin
203EOF
204chmod 755 /lib/systemd/systemd-user-sessions</userinput></screen>
205
206 </sect2>
207
208 <sect2 id="contents-systemd" role="content">
209 <title>Contents of systemd</title>
210
211 <segmentedlist>
212 <segtitle>Installed programs</segtitle>
213 <segtitle>Installed libraries</segtitle>
214 <segtitle>Installed directories</segtitle>
215
216 <seglistitem>
217 <seg>bootctl, busctl, coredumpctl, halt, hostnamectl, init, journalctl,
218 kernel-install, localectl, loginctl, machinectl, networkctl, poweroff,
219 reboot, runlevel, shutdown, systemctl, systemd-analyze,
220 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
221 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
222 systemd-inhibit, systemd-machine-id-setup, systemd-mount,
223 systemd-notify, systemd-nspawn, systemd-path, systemd-resolve,
224 systemd-run, systemd-socket-activate,
225 systemd-stdio-bridge, systemd-tmpfiles, systemd-tty-ask-password-agent,
226 telinit, timedatectl, and udevadm</seg>
227 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
228 libnss_resolve.so.2, libnss_systemd.so.2,
229 libsystemd.so, libsystemd-shared-231.so,
230 and libudev.so</seg>
231 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
232 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
233 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
234 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
235 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
236 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
237 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
238 </seglistitem>
239 </segmentedlist>
240
241 <variablelist>
242 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
243 <?dbfo list-presentation="list"?>
244 <?dbhtml list-presentation="table"?>
245
246 <varlistentry id="bootctl">
247 <term><command>bootctl</command></term>
248 <listitem>
249 <para>Used to query the firmware and boot manager settings</para>
250 <indexterm zone="ch-system-systemd bootctl">
251 <primary sortas="b-bootctl">bootctl</primary>
252 </indexterm>
253 </listitem>
254 </varlistentry>
255
256 <varlistentry id="busctl">
257 <term><command>busctl</command></term>
258 <listitem>
259 <para>Used to introspect and monitor the D-Bus bus</para>
260 <indexterm zone="ch-system-systemd busctl">
261 <primary sortas="b-busctl">busctl</primary>
262 </indexterm>
263 </listitem>
264 </varlistentry>
265
266 <varlistentry id="coredumpctl">
267 <term><command>coredumpctl</command></term>
268 <listitem>
269 <para>Used to retrieve coredumps from the systemd journal</para>
270 <indexterm zone="ch-system-systemd coredumpctl">
271 <primary sortas="b-coredumpctl">coredumpctl</primary>
272 </indexterm>
273 </listitem>
274 </varlistentry>
275
276 <varlistentry id="halt">
277 <term><command>halt</command></term>
278 <listitem>
279 <para>Normally invokes <command>shutdown</command> with the
280 <parameter>-h</parameter> option, except when already in run-level 0,
281 then it tells the kernel to halt the system; it notes in the
282 file <filename>/var/log/wtmp</filename> that the system is being
283 brought down</para>
284 <indexterm zone="ch-system-systemd halt">
285 <primary sortas="b-halt">halt</primary>
286 </indexterm>
287 </listitem>
288 </varlistentry>
289
290 <varlistentry id="hostnamectl">
291 <term><command>hostnamectl</command></term>
292 <listitem>
293 <para>Used to query and change the system hostname and related
294 settings</para>
295 <indexterm zone="ch-system-systemd hostnamectl">
296 <primary sortas="b-hostnamectl">hostnamectl</primary>
297 </indexterm>
298 </listitem>
299 </varlistentry>
300
301 <varlistentry id="init">
302 <term><command>init</command></term>
303 <listitem>
304 <para>The first process to be started when the kernel has initialized
305 the hardware which takes over the boot process and starts all
306 processes according to its configuration files</para>
307 <indexterm zone="ch-system-systemd init">
308 <primary sortas="b-init">init</primary>
309 </indexterm>
310 </listitem>
311 </varlistentry>
312
313 <varlistentry id="journalctl">
314 <term><command>journalctl</command></term>
315 <listitem>
316 <para>Used to query the contents of the systemd journal</para>
317 <indexterm zone="ch-system-systemd journalctl">
318 <primary sortas="b-journalctl">journalctl</primary>
319 </indexterm>
320 </listitem>
321 </varlistentry>
322
323 <varlistentry id="kernel-install">
324 <term><command>kernel-install</command></term>
325 <listitem>
326 <para>Used to add and remove kernel and initramfs images to and
327 from /boot</para>
328 <indexterm zone="ch-system-systemd kernel-install">
329 <primary sortas="b-kernel-install">kernel-install</primary>
330 </indexterm>
331 </listitem>
332 </varlistentry>
333
334 <varlistentry id="localectl">
335 <term><command>localectl</command></term>
336 <listitem>
337 <para>Used to query and change the system locale and keyboard layout
338 settings</para>
339 <indexterm zone="ch-system-systemd localectl">
340 <primary sortas="b-localectl">localectl</primary>
341 </indexterm>
342 </listitem>
343 </varlistentry>
344
345 <varlistentry id="loginctl">
346 <term><command>loginctl</command></term>
347 <listitem>
348 <para>Used to introspect and control the state of the systemd Login
349 Manager</para>
350 <indexterm zone="ch-system-systemd loginctl">
351 <primary sortas="b-loginctl">loginctl</primary>
352 </indexterm>
353 </listitem>
354 </varlistentry>
355
356 <varlistentry id="machinectl">
357 <term><command>machinectl</command></term>
358 <listitem>
359 <para>Used to introspect and control the state of the systemd Virtual
360 Machine and Container Registration Manager</para>
361 <indexterm zone="ch-system-systemd machinectl">
362 <primary sortas="b-machinectl">machinectl</primary>
363 </indexterm>
364 </listitem>
365 </varlistentry>
366
367 <varlistentry id="networkctl">
368 <term><command>networkctl</command></term>
369 <listitem>
370 <para>Used to introspect the state of the network links as seen by
371 systemd-networkd</para>
372 <indexterm zone="ch-system-systemd networkctl">
373 <primary sortas="b-networkctl">networkctl</primary>
374 </indexterm>
375 </listitem>
376 </varlistentry>
377
378 <varlistentry id="poweroff">
379 <term><command>poweroff</command></term>
380 <listitem>
381 <para>Tells the kernel to halt the system and switch off the computer
382 (see <command>halt</command>)</para>
383 <indexterm zone="ch-system-systemd poweroff">
384 <primary sortas="b-poweroff">poweroff</primary>
385 </indexterm>
386 </listitem>
387 </varlistentry>
388
389 <varlistentry id="reboot">
390 <term><command>reboot</command></term>
391 <listitem>
392 <para>Tells the kernel to reboot the system (see
393 <command>halt</command>)</para>
394 <indexterm zone="ch-system-systemd reboot">
395 <primary sortas="b-reboot">reboot</primary>
396 </indexterm>
397 </listitem>
398 </varlistentry>
399
400 <varlistentry id="runlevel">
401 <term><command>runlevel</command></term>
402 <listitem>
403 <para>Reports the previous and the current run-level, as noted in the
404 last run-level record in <filename>/var/run/utmp</filename></para>
405 <indexterm zone="ch-system-systemd runlevel">
406 <primary sortas="b-runlevel">runlevel</primary>
407 </indexterm>
408 </listitem>
409 </varlistentry>
410
411 <varlistentry id="shutdown">
412 <term><command>shutdown</command></term>
413 <listitem>
414 <para>Brings the system down in a secure way, signaling all processes
415 and notifying all logged-in users</para>
416 <indexterm zone="ch-system-systemd shutdown">
417 <primary sortas="b-shutdown">shutdown</primary>
418 </indexterm>
419 </listitem>
420 </varlistentry>
421
422 <varlistentry id="systemctl">
423 <term><command>systemctl</command></term>
424 <listitem>
425 <para>Used to introspect and control the state of the systemd system
426 and service manager</para>
427 <indexterm zone="ch-system-systemd systemctl">
428 <primary sortas="b-systemctl">systemctl</primary>
429 </indexterm>
430 </listitem>
431 </varlistentry>
432
433 <varlistentry id="systemd-analyze">
434 <term><command>systemd-analyze</command></term>
435 <listitem>
436 <para>Used to determine system boot-up performance of the current
437 boot</para>
438 <indexterm zone="ch-system-systemd systemd-analyze">
439 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
440 </indexterm>
441 </listitem>
442 </varlistentry>
443
444 <varlistentry id="systemd-ask-password">
445 <term><command>systemd-ask-password</command></term>
446 <listitem>
447 <para>Used to query a system password or passphrase from the user,
448 using a question message specified on the command line</para>
449 <indexterm zone="ch-system-systemd systemd-ask-password">
450 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
451 </indexterm>
452 </listitem>
453 </varlistentry>
454
455 <varlistentry id="systemd-cat">
456 <term><command>systemd-cat</command></term>
457 <listitem>
458 <para>Used to connect STDOUT and STDERR of a process with the Journal
459 </para>
460 <indexterm zone="ch-system-systemd systemd-cat">
461 <primary sortas="b-systemd-cat">systemd-cat</primary>
462 </indexterm>
463 </listitem>
464 </varlistentry>
465
466 <varlistentry id="systemd-cgls">
467 <term><command>systemd-cgls</command></term>
468 <listitem>
469 <para>Recursively shows the contents of the selected Linux control
470 group hierarchy in a tree</para>
471 <indexterm zone="ch-system-systemd systemd-cgls">
472 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
473 </indexterm>
474 </listitem>
475 </varlistentry>
476
477 <varlistentry id="systemd-cgtop">
478 <term><command>systemd-cgtop</command></term>
479 <listitem>
480 <para>Shows the top control groups of the local Linux control group
481 hierarchy, ordered by their CPU, memory and disk I/O load</para>
482 <indexterm zone="ch-system-systemd systemd-cgtop">
483 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
484 </indexterm>
485 </listitem>
486 </varlistentry>
487
488 <varlistentry id="systemd-delta">
489 <term><command>systemd-delta</command></term>
490 <listitem>
491 <para>Used to identify and compare configuration files in
492 <filename class="directory">/etc</filename> that override default
493 counterparts in <filename class="directory">/usr</filename></para>
494 <indexterm zone="ch-system-systemd systemd-delta">
495 <primary sortas="b-systemd-delta">systemd-delta</primary>
496 </indexterm>
497 </listitem>
498 </varlistentry>
499
500 <varlistentry id="systemd-detect-virt">
501 <term><command>systemd-detect-virt</command></term>
502 <listitem>
503 <para>Detects execution in a virtualized environment</para>
504 <indexterm zone="ch-system-systemd systemd-detect-virt">
505 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
506 </indexterm>
507 </listitem>
508 </varlistentry>
509
510 <varlistentry id="systemd-escape">
511 <term><command>systemd-escape</command></term>
512 <listitem>
513 <para>Used to escape strings for inclusion in systemd unit
514 names</para>
515 <indexterm zone="ch-system-systemd systemd-escape">
516 <primary sortas="b-systemd-escape">systemd-escape</primary>
517 </indexterm>
518 </listitem>
519 </varlistentry>
520
521 <varlistentry id="systemd-hwdb">
522 <term><command>systemd-hwdb</command></term>
523 <listitem>
524 <para>Used to manage hardware database (hwdb)</para>
525 <indexterm zone="ch-system-systemd systemd-hwdb">
526 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
527 </indexterm>
528 </listitem>
529 </varlistentry>
530
531 <varlistentry id="systemd-inhibit">
532 <term><command>systemd-inhibit</command></term>
533 <listitem>
534 <para>Used to execute a program with a shutdown, sleep or idle
535 inhibitor lock taken</para>
536 <indexterm zone="ch-system-systemd systemd-inhibit">
537 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
538 </indexterm>
539 </listitem>
540 </varlistentry>
541
542 <varlistentry id="systemd-machine-id-setup">
543 <term><command>systemd-machine-id-setup</command></term>
544 <listitem>
545 <para>Used by system installer tools to initialize the machine ID
546 stored in <filename>/etc/machine-id</filename> at install time with a
547 randomly generated ID</para>
548 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
549 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
550 </indexterm>
551 </listitem>
552 </varlistentry>
553
554 <varlistentry id="systemd-mount">
555 <term><command>systemd-mount</command></term>
556 <listitem>
557 <para>A tool to temporarily mount or auto-mount a drive.</para>
558 <indexterm zone="ch-system-systemd systemd-mount">
559 <primary sortas="b-systemd-mount">systemd-mount</primary>
560 </indexterm>
561 </listitem>
562 </varlistentry>
563
564 <varlistentry id="systemd-notify">
565 <term><command>systemd-notify</command></term>
566 <listitem>
567 <para>Used by daemon scripts to notify the init system about status
568 changes</para>
569 <indexterm zone="ch-system-systemd systemd-notify">
570 <primary sortas="b-systemd-notify">systemd-notify</primary>
571 </indexterm>
572 </listitem>
573 </varlistentry>
574
575 <varlistentry id="systemd-nspawn">
576 <term><command>systemd-nspawn</command></term>
577 <listitem>
578 <para>Used to run a command or OS in a light-weight namespace
579 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-resolve">
597 <term><command>systemd-resolve</command></term>
598 <listitem>
599 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
600 resource records, and services</para>
601 <indexterm zone="ch-system-systemd systemd-resolve">
602 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
603 </indexterm>
604 </listitem>
605 </varlistentry>
606
607 <varlistentry id="systemd-run">
608 <term><command>systemd-run</command></term>
609 <listitem>
610 <para>Used to create and start a transient .service or a .scope unit
611 and run the specified command in it</para>
612 <indexterm zone="ch-system-systemd systemd-run">
613 <primary sortas="b-systemd-run">systemd-run</primary>
614 </indexterm>
615 </listitem>
616 </varlistentry>
617
618 <!-- <varlistentry id="systemd-stdio-bridge">
619 <term><command>systemd-stdio-bridge</command></term>
620 <listitem>
621 <para>To be completed</para>
622 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
623 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
624 </indexterm>
625 </listitem>
626 </varlistentry> -->
627
628 <varlistentry id="systemd-socket-activate">
629 <term><command>systemd-socket-activate</command></term>
630 <listitem>
631 <para>A tool to listen on socket devices and launch a process upon
632 connection.</para>
633 <indexterm zone="ch-system-systemd systemd-socket-activate">
634 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</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>The main 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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