source: chapter06/systemd.xml@ 9220470

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Last change on this file since 9220470 was 9220470, checked in by DJ Lucas <dj@…>, 4 years ago

Update to D-Bus-1.10.24. Fixes #4143.
Update to Systemd-235. Fixes #4147.
Create /lib/systemd/systemd-user-sessions script to allow user login without systemd-logind.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11312 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 -s /tools/bin/true /usr/bin/xsltproc</userinput></screen>
46
47 <para>Prepare systemd for compilation:</para>
48
49<screen><userinput remap="configure">PKG_CONFIG_PATH=/usr/lib/pkgconfig:/tools/lib/pkgconfig \
50LANG=en_US.UTF-8 \
51 meson --prefix /usr \
52 --sysconfdir /etc \
53 --localstatedir /var \
54 -Dblkid=true \
55 -Dbuildtype=release \
56 -Ddefault-dnssec=no \
57 -Dfirstboot=false \
58 -Dkill-path=/bin/kill \
59 -Dkmod-path=/bin/kmod \
60 -Dldconfig=false \
61 -Dmount-path=/bin/mount \
62 -Drootprefix= \
63 -Drootlibdir=/lib \
64 -Dsplit-usr=true \
65 -Dsulogin-path=/sbin/sulogin \
66 -Dsysusers=false \
67 -Dumount-path=/bin/umount \
68 -Db_lto=false \
69 -Dc_link_args="-lblkid -lmount" \
70 -Dc_args="-I/tools/include/blkid -I/tools/include/libmount" \
71 $PWD build</userinput></screen>
72
73 <variablelist>
74 <title>The meaning of the meson options:</title>
75
76 <varlistentry>
77 <term><parameter>-D*-path=*</parameter></term>
78 <listitem>
79 <para>These switches provide location of binaries needed by
80 systemd at runtime that have not yet been installed, or who's
81 pkgconfig files are currently only in
82 <filename>/tools/lib/pkgconfig</filename>.</para>
83 </listitem>
84 </varlistentry>
85
86 <varlistentry>
87 <term><parameter>-Ddefault-dnssec=no</parameter></term>
88 <listitem>
89 <para>This switch turns off the experimental DNSSEC support.</para>
90 </listitem>
91 </varlistentry>
92
93 <varlistentry>
94 <term><parameter>-Dfirstboot=false</parameter></term>
95 <listitem>
96 <para>This switch prevents installation of systemd
97 services responsible for setting up the system for
98 the first time. They are not useful for LFS because
99 everything is done manually.</para>
100 </listitem>
101 </varlistentry>
102
103 <varlistentry>
104 <term><parameter>-Dldconfig=no</parameter></term>
105 <listitem>
106 <para>This switch prevents installation of a systemd
107 unit that runs <command>ldconfig</command> at
108 boot, making the boot time longer. Remove it if the
109 described feature is desired, even though it's not
110 useful for source distributions such as LFS.</para>
111 </listitem>
112 </varlistentry>
113
114 <varlistentry>
115 <term><parameter>-Droot*</parameter></term>
116 <listitem>
117 <para>These switches ensure that core programs and
118 shared libraries are installed in the subdirectories
119 of the root partition.</para>
120 </listitem>
121 </varlistentry>
122
123 <varlistentry>
124 <term><parameter>-Dsplit-usr=true</parameter></term>
125 <listitem>
126 <para>This switch ensures that systemd will work on
127 systems where /bin, /lib and /sbin directories are not
128 symlinks to their /usr counterparts.</para>
129 </listitem>
130 </varlistentry>
131
132 <varlistentry>
133 <term><parameter>-Dsysusers=false</parameter></term>
134 <listitem>
135 <para>This switch prevents installation of systemd
136 services responsible for setting up the
137 <filename>/etc/group</filename> and
138 <filename>/etc/passwd</filename> files. Both files
139 were created early in this chapter.</para>
140 </listitem>
141 </varlistentry>
142
143 <varlistentry>
144 <term><parameter>-Dc_link_args="-lblkid -lmount"</parameter></term>
145 <listitem>
146 <para>This switch manually adds libblkid and libmount to the
147 linker flags as they only exist in <filename>/tools/lib</filename>
148 until <application>Util-Linux</application> is installed later in
149 this chapter.</para>
150 </listitem>
151 </varlistentry>
152
153 <varlistentry>
154 <term><parameter>-Dc_args="-I/tools/include/blkid -I/tools/include/libmount"</parameter></term>
155 <listitem>
156 <para>This switch manually adds the include paths for libblkid and
157 libmount to the CFLAGS variable as the packages are not yet installed
158 in the final system.</para>
159 </listitem>
160 </varlistentry>
161
162 </variablelist>
163
164 <para>Compile the package:</para>
165
166<screen><userinput remap="make">tar -xf ../systemd-man-pages-&systemd-version;.tar.xz
167cd build
168LANG=en_US.UTF-8 ninja</userinput></screen>
169<!--
170 <para>To test the package, execute the following command:</para>
171
172<screen><userinput remap="test">LANG=en_US.UTF-8 ninja test</userinput></screen>
173-->
174 <para>Install the package:</para>
175
176<screen><userinput remap="install">LANG=en_US.UTF-8 ninja install</userinput></screen>
177
178 <para>Remove an unnecessary directory:</para>
179
180<screen><userinput remap="install">rm -rfv /usr/lib/rpm</userinput></screen>
181
182 <para>Create the Sysvinit compatibility symlinks, so systemd is used
183 as the default init system:</para>
184
185<screen><userinput remap="install">for tool in runlevel reboot shutdown poweroff halt telinit; do
186 ln -sfv ../bin/systemctl /sbin/${tool}
187done
188ln -sfv ../lib/systemd/systemd /sbin/init</userinput></screen>
189
190 <para>Remove our earlier created symlink for xsltproc:</para>
191
192<screen><userinput remap="install">rm -f /usr/bin/xsltproc</userinput></screen>
193
194 <para>Create the <filename>/etc/machine-id</filename> file needed by
195 <command>systemd-journald</command>:</para>
196
197<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
198
199 <para>Create the <filename>/lib/systemd/systemd-user-sessions</filename>
200 script to allow unprivileged user logins without
201 <application>systemd-logind</application>:</para>
202
203<screen><userinput remap="adjust">cat &gt; /lib/systemd/systemd-user-sessions &lt;&lt; "EOF"
204#!/bin/bash
205rm -f /run/nologin
206EOF
207chmod 755 /lib/systemd/systemd-user-sessions</userinput></screen>
208
209 </sect2>
210
211 <sect2 id="contents-systemd" role="content">
212 <title>Contents of systemd</title>
213
214 <segmentedlist>
215 <segtitle>Installed programs</segtitle>
216 <segtitle>Installed libraries</segtitle>
217 <segtitle>Installed directories</segtitle>
218
219 <seglistitem>
220 <seg>bootctl, busctl, coredumpctl, halt, hostnamectl, init, journalctl,
221 kernel-install, localectl, loginctl, machinectl, networkctl, poweroff,
222 reboot, runlevel, shutdown, systemctl, systemd-analyze,
223 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
224 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
225 systemd-inhibit, systemd-machine-id-setup, systemd-mount,
226 systemd-notify, systemd-nspawn, systemd-path, systemd-resolve,
227 systemd-run, systemd-socket-activate,
228 systemd-stdio-bridge, systemd-tmpfiles, systemd-tty-ask-password-agent,
229 telinit, timedatectl, and udevadm</seg>
230 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
231 libnss_resolve.so.2, libnss_systemd.so.2,
232 libsystemd.so, libsystemd-shared-231.so,
233 and libudev.so</seg>
234 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
235 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
236 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
237 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
238 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
239 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
240 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
241 </seglistitem>
242 </segmentedlist>
243
244 <variablelist>
245 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
246 <?dbfo list-presentation="list"?>
247 <?dbhtml list-presentation="table"?>
248
249 <varlistentry id="bootctl">
250 <term><command>bootctl</command></term>
251 <listitem>
252 <para>used to query the firmware and boot manager settings</para>
253 <indexterm zone="ch-system-systemd bootctl">
254 <primary sortas="b-bootctl">bootctl</primary>
255 </indexterm>
256 </listitem>
257 </varlistentry>
258
259 <varlistentry id="busctl">
260 <term><command>busctl</command></term>
261 <listitem>
262 <para>Used to introspect and monitor the D-Bus bus</para>
263 <indexterm zone="ch-system-systemd busctl">
264 <primary sortas="b-busctl">busctl</primary>
265 </indexterm>
266 </listitem>
267 </varlistentry>
268
269 <varlistentry id="coredumpctl">
270 <term><command>coredumpctl</command></term>
271 <listitem>
272 <para>Used to retrieve coredumps from the systemd Journal</para>
273 <indexterm zone="ch-system-systemd coredumpctl">
274 <primary sortas="b-coredumpctl">coredumpctl</primary>
275 </indexterm>
276 </listitem>
277 </varlistentry>
278
279 <varlistentry id="halt">
280 <term><command>halt</command></term>
281 <listitem>
282 <para>Normally invokes <command>shutdown</command> with the
283 <parameter>-h</parameter> option, except when already in run-level 0,
284 then it tells the kernel to halt the system; it notes in the
285 file <filename>/var/log/wtmp</filename> that the system is being
286 brought down</para>
287 <indexterm zone="ch-system-systemd halt">
288 <primary sortas="b-halt">halt</primary>
289 </indexterm>
290 </listitem>
291 </varlistentry>
292
293 <varlistentry id="hostnamectl">
294 <term><command>hostnamectl</command></term>
295 <listitem>
296 <para>Used to query and change the system hostname and related
297 settings</para>
298 <indexterm zone="ch-system-systemd hostnamectl">
299 <primary sortas="b-hostnamectl">hostnamectl</primary>
300 </indexterm>
301 </listitem>
302 </varlistentry>
303
304 <varlistentry id="init">
305 <term><command>init</command></term>
306 <listitem>
307 <para>The first process to be started when the kernel has initialized
308 the hardware which takes over the boot process and starts all the
309 proceses it is instructed to</para>
310 <indexterm zone="ch-system-systemd init">
311 <primary sortas="b-init">init</primary>
312 </indexterm>
313 </listitem>
314 </varlistentry>
315
316 <varlistentry id="journalctl">
317 <term><command>journalctl</command></term>
318 <listitem>
319 <para>Used to query the contents of the systemd Journal</para>
320 <indexterm zone="ch-system-systemd journalctl">
321 <primary sortas="b-journalctl">journalctl</primary>
322 </indexterm>
323 </listitem>
324 </varlistentry>
325
326 <varlistentry id="kernel-install">
327 <term><command>kernel-install</command></term>
328 <listitem>
329 <para>Used to add and remove kernel and initramfs images to and
330 from /boot</para>
331 <indexterm zone="ch-system-systemd kernel-install">
332 <primary sortas="b-kernel-install">kernel-install</primary>
333 </indexterm>
334 </listitem>
335 </varlistentry>
336
337 <varlistentry id="localectl">
338 <term><command>localectl</command></term>
339 <listitem>
340 <para>Used to query and change the system locale and keyboard layout
341 settings</para>
342 <indexterm zone="ch-system-systemd localectl">
343 <primary sortas="b-localectl">localectl</primary>
344 </indexterm>
345 </listitem>
346 </varlistentry>
347
348 <varlistentry id="loginctl">
349 <term><command>loginctl</command></term>
350 <listitem>
351 <para>Used to introspect and control the state of the systemd Login
352 Manager</para>
353 <indexterm zone="ch-system-systemd loginctl">
354 <primary sortas="b-loginctl">loginctl</primary>
355 </indexterm>
356 </listitem>
357 </varlistentry>
358
359 <varlistentry id="machinectl">
360 <term><command>machinectl</command></term>
361 <listitem>
362 <para>Used to introspect and control the state of the systemd Virtual
363 Machine and Container Registration Manager</para>
364 <indexterm zone="ch-system-systemd machinectl">
365 <primary sortas="b-machinectl">machinectl</primary>
366 </indexterm>
367 </listitem>
368 </varlistentry>
369
370 <varlistentry id="networkctl">
371 <term><command>networkctl</command></term>
372 <listitem>
373 <para>Used to introspect the state of the network links as seen by
374 systemd-networkd</para>
375 <indexterm zone="ch-system-systemd networkctl">
376 <primary sortas="b-networkctl">networkctl</primary>
377 </indexterm>
378 </listitem>
379 </varlistentry>
380
381 <varlistentry id="poweroff">
382 <term><command>poweroff</command></term>
383 <listitem>
384 <para>Tells the kernel to halt the system and switch off the computer
385 (see <command>halt</command>)</para>
386 <indexterm zone="ch-system-systemd poweroff">
387 <primary sortas="b-poweroff">poweroff</primary>
388 </indexterm>
389 </listitem>
390 </varlistentry>
391
392 <varlistentry id="reboot">
393 <term><command>reboot</command></term>
394 <listitem>
395 <para>Tells the kernel to reboot the system (see
396 <command>halt</command>)</para>
397 <indexterm zone="ch-system-systemd reboot">
398 <primary sortas="b-reboot">reboot</primary>
399 </indexterm>
400 </listitem>
401 </varlistentry>
402
403 <varlistentry id="runlevel">
404 <term><command>runlevel</command></term>
405 <listitem>
406 <para>Reports the previous and the current run-level, as noted in the
407 last run-level record in <filename>/var/run/utmp</filename></para>
408 <indexterm zone="ch-system-systemd runlevel">
409 <primary sortas="b-runlevel">runlevel</primary>
410 </indexterm>
411 </listitem>
412 </varlistentry>
413
414 <varlistentry id="shutdown">
415 <term><command>shutdown</command></term>
416 <listitem>
417 <para>Brings the system down in a secure way, signaling all processes
418 and notifying all logged-in users</para>
419 <indexterm zone="ch-system-systemd shutdown">
420 <primary sortas="b-shutdown">shutdown</primary>
421 </indexterm>
422 </listitem>
423 </varlistentry>
424
425 <varlistentry id="systemctl">
426 <term><command>systemctl</command></term>
427 <listitem>
428 <para>Used to introspect and control the state of the systemd system
429 and service manager</para>
430 <indexterm zone="ch-system-systemd systemctl">
431 <primary sortas="b-systemctl">systemctl</primary>
432 </indexterm>
433 </listitem>
434 </varlistentry>
435
436 <varlistentry id="systemd-analyze">
437 <term><command>systemd-analyze</command></term>
438 <listitem>
439 <para>Used to determine system boot-up performance of the current
440 boot</para>
441 <indexterm zone="ch-system-systemd systemd-analyze">
442 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
443 </indexterm>
444 </listitem>
445 </varlistentry>
446
447 <varlistentry id="systemd-ask-password">
448 <term><command>systemd-ask-password</command></term>
449 <listitem>
450 <para>Used to query a system password or passphrase from the user,
451 using a question message specified on the command line</para>
452 <indexterm zone="ch-system-systemd systemd-ask-password">
453 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
454 </indexterm>
455 </listitem>
456 </varlistentry>
457
458 <varlistentry id="systemd-cat">
459 <term><command>systemd-cat</command></term>
460 <listitem>
461 <para>Used to connect STDOUT and STDERR of a process with the Journal
462 </para>
463 <indexterm zone="ch-system-systemd systemd-cat">
464 <primary sortas="b-systemd-cat">systemd-cat</primary>
465 </indexterm>
466 </listitem>
467 </varlistentry>
468
469 <varlistentry id="systemd-cgls">
470 <term><command>systemd-cgls</command></term>
471 <listitem>
472 <para>Recursively shows the contents of the selected Linux control
473 group hierarchy in a tree</para>
474 <indexterm zone="ch-system-systemd systemd-cgls">
475 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
476 </indexterm>
477 </listitem>
478 </varlistentry>
479
480 <varlistentry id="systemd-cgtop">
481 <term><command>systemd-cgtop</command></term>
482 <listitem>
483 <para>Shows the top control groups of the local Linux control group
484 hierarchy, ordered by their CPU, memory and disk I/O load</para>
485 <indexterm zone="ch-system-systemd systemd-cgtop">
486 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
487 </indexterm>
488 </listitem>
489 </varlistentry>
490
491 <varlistentry id="systemd-delta">
492 <term><command>systemd-delta</command></term>
493 <listitem>
494 <para>Used to identify and compare configuration files in
495 <filename class="directory">/etc</filename> that override default
496 counterparts in <filename class="directory">/usr</filename></para>
497 <indexterm zone="ch-system-systemd systemd-delta">
498 <primary sortas="b-systemd-delta">systemd-delta</primary>
499 </indexterm>
500 </listitem>
501 </varlistentry>
502
503 <varlistentry id="systemd-detect-virt">
504 <term><command>systemd-detect-virt</command></term>
505 <listitem>
506 <para>Detects execution in a virtualized environment</para>
507 <indexterm zone="ch-system-systemd systemd-detect-virt">
508 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
509 </indexterm>
510 </listitem>
511 </varlistentry>
512
513 <varlistentry id="systemd-escape">
514 <term><command>systemd-escape</command></term>
515 <listitem>
516 <para>Used to escape strings for inclusion in systemd unit
517 names</para>
518 <indexterm zone="ch-system-systemd systemd-escape">
519 <primary sortas="b-systemd-escape">systemd-escape</primary>
520 </indexterm>
521 </listitem>
522 </varlistentry>
523
524 <varlistentry id="systemd-hwdb">
525 <term><command>systemd-hwdb</command></term>
526 <listitem>
527 <para>Used to manage hardware database (hwdb)</para>
528 <indexterm zone="ch-system-systemd systemd-hwdb">
529 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
530 </indexterm>
531 </listitem>
532 </varlistentry>
533
534 <varlistentry id="systemd-inhibit">
535 <term><command>systemd-inhibit</command></term>
536 <listitem>
537 <para>Used to execute a program with a shutdown, sleep or idle
538 inhibitor lock taken</para>
539 <indexterm zone="ch-system-systemd systemd-inhibit">
540 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
541 </indexterm>
542 </listitem>
543 </varlistentry>
544
545 <varlistentry id="systemd-machine-id-setup">
546 <term><command>systemd-machine-id-setup</command></term>
547 <listitem>
548 <para>Used by system installer tools to initialize the machine ID
549 stored in <filename>/etc/machine-id</filename> at install time with a
550 randomly generated ID</para>
551 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
552 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
553 </indexterm>
554 </listitem>
555 </varlistentry>
556
557 <varlistentry id="systemd-mount">
558 <term><command>systemd-mount</command></term>
559 <listitem>
560 <para>is a tool to temporarily mount or auto-mount a drive.</para>
561 <indexterm zone="ch-system-systemd systemd-mount">
562 <primary sortas="b-systemd-mount">systemd-mount</primary>
563 </indexterm>
564 </listitem>
565 </varlistentry>
566
567 <varlistentry id="systemd-notify">
568 <term><command>systemd-notify</command></term>
569 <listitem>
570 <para>Used by daemon scripts to notify the init system about status
571 changes</para>
572 <indexterm zone="ch-system-systemd systemd-notify">
573 <primary sortas="b-systemd-notify">systemd-notify</primary>
574 </indexterm>
575 </listitem>
576 </varlistentry>
577
578 <varlistentry id="systemd-nspawn">
579 <term><command>systemd-nspawn</command></term>
580 <listitem>
581 <para>Used to run a command or OS in a light-weight namespace
582 container</para>
583 <indexterm zone="ch-system-systemd systemd-nspawn">
584 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
585 </indexterm>
586 </listitem>
587 </varlistentry>
588
589 <varlistentry id="systemd-path">
590 <term><command>systemd-path</command></term>
591 <listitem>
592 <para>Used to query system and user paths</para>
593 <indexterm zone="ch-system-systemd systemd-path">
594 <primary sortas="b-systemd-path">systemd-path</primary>
595 </indexterm>
596 </listitem>
597 </varlistentry>
598
599 <varlistentry id="systemd-resolve">
600 <term><command>systemd-resolve</command></term>
601 <listitem>
602 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
603 resource records, and services</para>
604 <indexterm zone="ch-system-systemd systemd-resolve">
605 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
606 </indexterm>
607 </listitem>
608 </varlistentry>
609
610 <varlistentry id="systemd-run">
611 <term><command>systemd-run</command></term>
612 <listitem>
613 <para>Used to create and start a transient .service or a .scope unit
614 and run the specified command in it</para>
615 <indexterm zone="ch-system-systemd systemd-run">
616 <primary sortas="b-systemd-run">systemd-run</primary>
617 </indexterm>
618 </listitem>
619 </varlistentry>
620
621 <!-- <varlistentry id="systemd-stdio-bridge">
622 <term><command>systemd-stdio-bridge</command></term>
623 <listitem>
624 <para>To be completed</para>
625 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
626 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
627 </indexterm>
628 </listitem>
629 </varlistentry> -->
630
631 <varlistentry id="systemd-socket-activate">
632 <term><command>systemd-socket-activate</command></term>
633 <listitem>
634 <para>is a tool to listen on socket devices and launch a process upon
635 connection.</para>
636 <indexterm zone="ch-system-systemd systemd-socket-activate">
637 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
638 </indexterm>
639 </listitem>
640 </varlistentry>
641
642 <varlistentry id="systemd-tmpfiles">
643 <term><command>systemd-tmpfiles</command></term>
644 <listitem>
645 <para>Creates, deletes and cleans up volatile and temporary files and
646 directories, based on the configuration file format and location
647 specified in
648 <filename class="directory">tmpfiles.d</filename> directories</para>
649 <indexterm zone="ch-system-systemd systemd-tmpfiles">
650 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
651 </indexterm>
652 </listitem>
653 </varlistentry>
654
655 <varlistentry id="systemd-tty-ask-password-agent">
656 <term><command>systemd-tty-ask-password-agent</command></term>
657 <listitem>
658 <para>Used to list or process pending systemd password requests</para>
659 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
660 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
661 </indexterm>
662 </listitem>
663 </varlistentry>
664
665 <varlistentry id="telinit">
666 <term><command>telinit</command></term>
667 <listitem>
668 <para>Tells <command>init</command> which run-level to change
669 to</para>
670 <indexterm zone="ch-system-systemd telinit">
671 <primary sortas="b-telinit">telinit</primary>
672 </indexterm>
673 </listitem>
674 </varlistentry>
675
676 <varlistentry id="timedatectl">
677 <term><command>timedatectl</command></term>
678 <listitem>
679 <para>Used to query and change the system clock and its settings
680 </para>
681 <indexterm zone="ch-system-systemd timedatectl">
682 <primary sortas="b-timedatectl">timedatectl</primary>
683 </indexterm>
684 </listitem>
685 </varlistentry>
686
687 <varlistentry id="udevadm">
688 <term><command>udevadm</command></term>
689 <listitem>
690 <para>Generic Udev administration tool: controls the udevd daemon,
691 provides info from the Udev database, monitors uevents, waits for
692 uevents to finish, tests Udev configuration, and triggers uevents
693 for a given device</para>
694 <indexterm zone="ch-system-systemd udevadm">
695 <primary sortas="b-udevadm">udevadm</primary>
696 </indexterm>
697 </listitem>
698 </varlistentry>
699
700 <varlistentry id="libsystemd">
701 <term><filename class="libraryfile">libsystemd</filename></term>
702 <listitem>
703 <para>systemd utility library</para>
704 <indexterm zone="ch-system-systemd libsystemd">
705 <primary sortas="c-libsystemd">libsystemd</primary>
706 </indexterm>
707 </listitem>
708 </varlistentry>
709
710 <varlistentry id="libudev">
711 <term><filename class="libraryfile">libudev</filename></term>
712 <listitem>
713 <para>A library to access Udev device information</para>
714 <indexterm zone="ch-system-systemd libudev">
715 <primary sortas="c-libudev">libudev</primary>
716 </indexterm>
717 </listitem>
718 </varlistentry>
719
720 </variablelist>
721
722 </sect2>
723
724</sect1>
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