source: chapter06/systemd.xml@ ba91030

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Last change on this file since ba91030 was ba91030, checked in by DJ Lucas <dj@…>, 7 years ago

Update to linux-4.12.2. Fixes #4113.
Update to expat-2.2.2. Fixes #4112.
Update to systemd-234. Fixes #4111.
Postpone systemd test suite until BLFS. Fixes #4107.

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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, disable two tests that always fail:</para>
44
45<screen><userinput remap="pre">sed -e 's@test/udev-test.pl @@' \
46 -e 's@test-copy$(EXEEXT) @@' \
47 -i Makefile.in</userinput></screen>
48
49 <para>Create a file to allow systemd to build when using Util-Linux
50 built in Chapter 5, to disable LTO by default, and to build without
51 xlstproc:</para>
52
53<screen><userinput remap="pre">cat &gt; config.cache &lt;&lt; "EOF"
54<literal>KILL=/bin/kill
55MOUNT_PATH=/bin/mount
56UMOUNT_PATH=/bin/umount
57HAVE_BLKID=1
58BLKID_LIBS="-lblkid"
59BLKID_CFLAGS="-I/tools/include/blkid"
60HAVE_LIBMOUNT=1
61MOUNT_LIBS="-lmount"
62MOUNT_CFLAGS="-I/tools/include/libmount"
63cc_cv_CFLAGS__flto=no
64SULOGIN="/sbin/sulogin"
65GPERF_LEN_TYPE=size_t
66XSLTPROC="/usr/bin/xsltproc"</literal>
67EOF</userinput></screen>
68
69 <para>LTO is disabled by default because it causes
70 <command>systemd</command> and other auxiliary programs to link to
71 <filename class="libraryfile">libgcc_s.so</filename>, slows the build down
72 and makes the compiled code larger.</para>
73
74 <para>Prepare systemd for compilation:</para>
75
76<screen><userinput remap="configure">./configure --prefix=/usr \
77 --sysconfdir=/etc \
78 --localstatedir=/var \
79 --config-cache \
80 --with-rootprefix= \
81 --with-rootlibdir=/lib \
82 --enable-split-usr \
83 --disable-firstboot \
84 --disable-ldconfig \
85 --disable-sysusers \
86 --without-python \
87 --with-default-dnssec=no \
88 --docdir=/usr/share/doc/systemd-&systemd-version;</userinput></screen>
89
90 <variablelist>
91 <title>The meaning of the configure options:</title>
92
93 <varlistentry>
94 <term><parameter>--config-cache</parameter></term>
95 <listitem>
96 <para>This switch tells the build system to use
97 the <filename>config.cache</filename> file which
98 was created earlier.</para>
99 </listitem>
100 </varlistentry>
101
102 <varlistentry>
103 <term><parameter>--with-root*</parameter></term>
104 <listitem>
105 <para>These switches ensure that core programs and
106 shared libraries are installed in the subdirectories
107 of the root partition.</para>
108 </listitem>
109 </varlistentry>
110
111 <varlistentry>
112 <term><parameter>--enable-split-usr</parameter></term>
113 <listitem>
114 <para>This switch ensures that systemd will work on
115 systems where /bin, /lib and /sbin directories are not
116 symlinks to their /usr counterparts.</para>
117 </listitem>
118 </varlistentry>
119
120 <varlistentry>
121 <term><parameter>--without-python</parameter></term>
122 <listitem>
123 <para>This switch prevents <command>configure</command>
124 from trying to use Python which isn't built
125 in LFS.</para>
126 </listitem>
127 </varlistentry>
128
129 <varlistentry>
130 <term><parameter>--disable-firstboot</parameter></term>
131 <listitem>
132 <para>This switch prevents installation of systemd
133 services responsible for setting up the system for
134 the first time. They are not useful for LFS because
135 everything is done manually.</para>
136 </listitem>
137 </varlistentry>
138
139 <varlistentry>
140 <term><parameter>--disable-ldconfig</parameter></term>
141 <listitem>
142 <para>This switch prevents installation of a systemd
143 unit that runs <command>ldconfig</command> at
144 boot, making the boot time longer. Remove it if the
145 described feature is desired, even though it's not
146 useful for source distributions such as LFS.</para>
147 </listitem>
148 </varlistentry>
149
150 <varlistentry>
151 <term><parameter>--disable-sysusers</parameter></term>
152 <listitem>
153 <para>This switch prevents installation of systemd
154 services responsible for setting up the
155 <filename>/etc/group</filename> and
156 <filename>/etc/passwd</filename> files. Both files
157 were created early in this chapter.</para>
158 </listitem>
159 </varlistentry>
160
161 <varlistentry>
162 <term><parameter>--with-default-dnssec=no</parameter></term>
163 <listitem>
164 <para>This switch turns off the experimental DNSSEC support.</para>
165 </listitem>
166 </varlistentry>
167
168 </variablelist>
169
170 <para>Compile the package:</para>
171
172<screen><userinput remap="make">make</userinput></screen>
173
174 <para>This package has a test suite, but it can only be run after the
175 package has been reinstalled in BLFS.</para>
176
177 <para>Install the package:</para>
178
179<screen><userinput remap="install">make install</userinput></screen>
180
181<!-- These get installed into /lib now by default.
182 <para>Move the NSS libraries to <filename class="directory">/lib</filename>:</para>
183
184<screen><userinput remap="install">mv -v /usr/lib/libnss_{myhostname,mymachines,resolve}.so.2 /lib</userinput></screen>
185-->
186
187 <para>Remove an unnecessary directory:</para>
188
189<screen><userinput remap="install">rm -rfv /usr/lib/rpm</userinput></screen>
190
191 <para>Create the Sysvinit compatibility symlinks, so systemd is used
192 as the default init system:</para>
193
194<screen><userinput remap="install">for tool in runlevel reboot shutdown poweroff halt telinit; do
195 ln -sfv ../bin/systemctl /sbin/${tool}
196done
197ln -sfv ../lib/systemd/systemd /sbin/init</userinput></screen>
198
199<!--
200 <para>Remove a reference to a non-existent group:</para>
201
202<screen><userinput remap="install">sed -i "s:0775 root lock:0755 root root:g" /usr/lib/tmpfiles.d/legacy.conf</userinput></screen>
203-->
204
205 <para>Create the <filename>/etc/machine-id</filename> file needed by
206 <command>systemd-journald</command>:</para>
207
208<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
209
210 <para>Since the testsuite largely depends on the host system kernel
211 configuration, some tests may fail. It also needs a modification in
212 order not to look for a program that will be installed by Util-Linux
213 package later in this chapter. To test the results, issue:</para>
214
215<screen><userinput remap="test">sed -i "s:minix:ext4:g" src/test/test-path-util.c
216make -k check</userinput></screen>
217
218 </sect2>
219
220 <sect2 id="contents-systemd" role="content">
221 <title>Contents of systemd</title>
222
223 <segmentedlist>
224 <segtitle>Installed programs</segtitle>
225 <segtitle>Installed libraries</segtitle>
226 <segtitle>Installed directories</segtitle>
227
228 <seglistitem>
229 <seg>bootctl, busctl, coredumpctl, halt, hostnamectl, init, journalctl,
230 kernel-install, localectl, loginctl, machinectl, networkctl, poweroff,
231 reboot, runlevel, shutdown, systemctl, systemd-analyze,
232 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
233 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
234 systemd-inhibit, systemd-machine-id-setup, systemd-mount,
235 systemd-notify, systemd-nspawn, systemd-path, systemd-resolve,
236 systemd-run, systemd-socket-activate,
237 systemd-stdio-bridge, systemd-tmpfiles, systemd-tty-ask-password-agent,
238 telinit, timedatectl, and udevadm</seg>
239 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
240 libnss_resolve.so.2, libnss_systemd.so.2,
241 libsystemd.so, libsystemd-shared-231.so,
242 and libudev.so</seg>
243 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
244 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
245 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
246 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
247 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
248 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
249 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
250 </seglistitem>
251 </segmentedlist>
252
253 <variablelist>
254 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
255 <?dbfo list-presentation="list"?>
256 <?dbhtml list-presentation="table"?>
257
258 <varlistentry id="bootctl">
259 <term><command>bootctl</command></term>
260 <listitem>
261 <para>used to query the firmware and boot manager settings</para>
262 <indexterm zone="ch-system-systemd bootctl">
263 <primary sortas="b-bootctl">bootctl</primary>
264 </indexterm>
265 </listitem>
266 </varlistentry>
267
268 <varlistentry id="busctl">
269 <term><command>busctl</command></term>
270 <listitem>
271 <para>Used to introspect and monitor the D-Bus bus</para>
272 <indexterm zone="ch-system-systemd busctl">
273 <primary sortas="b-busctl">busctl</primary>
274 </indexterm>
275 </listitem>
276 </varlistentry>
277
278 <varlistentry id="coredumpctl">
279 <term><command>coredumpctl</command></term>
280 <listitem>
281 <para>Used to retrieve coredumps from the systemd Journal</para>
282 <indexterm zone="ch-system-systemd coredumpctl">
283 <primary sortas="b-coredumpctl">coredumpctl</primary>
284 </indexterm>
285 </listitem>
286 </varlistentry>
287
288 <varlistentry id="halt">
289 <term><command>halt</command></term>
290 <listitem>
291 <para>Normally invokes <command>shutdown</command> with the
292 <parameter>-h</parameter> option, except when already in run-level 0,
293 then it tells the kernel to halt the system; it notes in the
294 file <filename>/var/log/wtmp</filename> that the system is being
295 brought down</para>
296 <indexterm zone="ch-system-systemd halt">
297 <primary sortas="b-halt">halt</primary>
298 </indexterm>
299 </listitem>
300 </varlistentry>
301
302 <varlistentry id="hostnamectl">
303 <term><command>hostnamectl</command></term>
304 <listitem>
305 <para>Used to query and change the system hostname and related
306 settings</para>
307 <indexterm zone="ch-system-systemd hostnamectl">
308 <primary sortas="b-hostnamectl">hostnamectl</primary>
309 </indexterm>
310 </listitem>
311 </varlistentry>
312
313 <varlistentry id="init">
314 <term><command>init</command></term>
315 <listitem>
316 <para>The first process to be started when the kernel has initialized
317 the hardware which takes over the boot process and starts all the
318 proceses it is instructed to</para>
319 <indexterm zone="ch-system-systemd init">
320 <primary sortas="b-init">init</primary>
321 </indexterm>
322 </listitem>
323 </varlistentry>
324
325 <varlistentry id="journalctl">
326 <term><command>journalctl</command></term>
327 <listitem>
328 <para>Used to query the contents of the systemd Journal</para>
329 <indexterm zone="ch-system-systemd journalctl">
330 <primary sortas="b-journalctl">journalctl</primary>
331 </indexterm>
332 </listitem>
333 </varlistentry>
334
335 <varlistentry id="kernel-install">
336 <term><command>kernel-install</command></term>
337 <listitem>
338 <para>Used to add and remove kernel and initramfs images to and
339 from /boot</para>
340 <indexterm zone="ch-system-systemd kernel-install">
341 <primary sortas="b-kernel-install">kernel-install</primary>
342 </indexterm>
343 </listitem>
344 </varlistentry>
345
346 <varlistentry id="localectl">
347 <term><command>localectl</command></term>
348 <listitem>
349 <para>Used to query and change the system locale and keyboard layout
350 settings</para>
351 <indexterm zone="ch-system-systemd localectl">
352 <primary sortas="b-localectl">localectl</primary>
353 </indexterm>
354 </listitem>
355 </varlistentry>
356
357 <varlistentry id="loginctl">
358 <term><command>loginctl</command></term>
359 <listitem>
360 <para>Used to introspect and control the state of the systemd Login
361 Manager</para>
362 <indexterm zone="ch-system-systemd loginctl">
363 <primary sortas="b-loginctl">loginctl</primary>
364 </indexterm>
365 </listitem>
366 </varlistentry>
367
368 <varlistentry id="machinectl">
369 <term><command>machinectl</command></term>
370 <listitem>
371 <para>Used to introspect and control the state of the systemd Virtual
372 Machine and Container Registration Manager</para>
373 <indexterm zone="ch-system-systemd machinectl">
374 <primary sortas="b-machinectl">machinectl</primary>
375 </indexterm>
376 </listitem>
377 </varlistentry>
378
379 <varlistentry id="networkctl">
380 <term><command>networkctl</command></term>
381 <listitem>
382 <para>Used to introspect the state of the network links as seen by
383 systemd-networkd</para>
384 <indexterm zone="ch-system-systemd networkctl">
385 <primary sortas="b-networkctl">networkctl</primary>
386 </indexterm>
387 </listitem>
388 </varlistentry>
389
390 <varlistentry id="poweroff">
391 <term><command>poweroff</command></term>
392 <listitem>
393 <para>Tells the kernel to halt the system and switch off the computer
394 (see <command>halt</command>)</para>
395 <indexterm zone="ch-system-systemd poweroff">
396 <primary sortas="b-poweroff">poweroff</primary>
397 </indexterm>
398 </listitem>
399 </varlistentry>
400
401 <varlistentry id="reboot">
402 <term><command>reboot</command></term>
403 <listitem>
404 <para>Tells the kernel to reboot the system (see
405 <command>halt</command>)</para>
406 <indexterm zone="ch-system-systemd reboot">
407 <primary sortas="b-reboot">reboot</primary>
408 </indexterm>
409 </listitem>
410 </varlistentry>
411
412 <varlistentry id="runlevel">
413 <term><command>runlevel</command></term>
414 <listitem>
415 <para>Reports the previous and the current run-level, as noted in the
416 last run-level record in <filename>/var/run/utmp</filename></para>
417 <indexterm zone="ch-system-systemd runlevel">
418 <primary sortas="b-runlevel">runlevel</primary>
419 </indexterm>
420 </listitem>
421 </varlistentry>
422
423 <varlistentry id="shutdown">
424 <term><command>shutdown</command></term>
425 <listitem>
426 <para>Brings the system down in a secure way, signaling all processes
427 and notifying all logged-in users</para>
428 <indexterm zone="ch-system-systemd shutdown">
429 <primary sortas="b-shutdown">shutdown</primary>
430 </indexterm>
431 </listitem>
432 </varlistentry>
433
434 <varlistentry id="systemctl">
435 <term><command>systemctl</command></term>
436 <listitem>
437 <para>Used to introspect and control the state of the systemd system
438 and service manager</para>
439 <indexterm zone="ch-system-systemd systemctl">
440 <primary sortas="b-systemctl">systemctl</primary>
441 </indexterm>
442 </listitem>
443 </varlistentry>
444
445 <varlistentry id="systemd-analyze">
446 <term><command>systemd-analyze</command></term>
447 <listitem>
448 <para>Used to determine system boot-up performance of the current
449 boot</para>
450 <indexterm zone="ch-system-systemd systemd-analyze">
451 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
452 </indexterm>
453 </listitem>
454 </varlistentry>
455
456 <varlistentry id="systemd-ask-password">
457 <term><command>systemd-ask-password</command></term>
458 <listitem>
459 <para>Used to query a system password or passphrase from the user,
460 using a question message specified on the command line</para>
461 <indexterm zone="ch-system-systemd systemd-ask-password">
462 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
463 </indexterm>
464 </listitem>
465 </varlistentry>
466
467 <varlistentry id="systemd-cat">
468 <term><command>systemd-cat</command></term>
469 <listitem>
470 <para>Used to connect STDOUT and STDERR of a process with the Journal
471 </para>
472 <indexterm zone="ch-system-systemd systemd-cat">
473 <primary sortas="b-systemd-cat">systemd-cat</primary>
474 </indexterm>
475 </listitem>
476 </varlistentry>
477
478 <varlistentry id="systemd-cgls">
479 <term><command>systemd-cgls</command></term>
480 <listitem>
481 <para>Recursively shows the contents of the selected Linux control
482 group hierarchy in a tree</para>
483 <indexterm zone="ch-system-systemd systemd-cgls">
484 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
485 </indexterm>
486 </listitem>
487 </varlistentry>
488
489 <varlistentry id="systemd-cgtop">
490 <term><command>systemd-cgtop</command></term>
491 <listitem>
492 <para>Shows the top control groups of the local Linux control group
493 hierarchy, ordered by their CPU, memory and disk I/O load</para>
494 <indexterm zone="ch-system-systemd systemd-cgtop">
495 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
496 </indexterm>
497 </listitem>
498 </varlistentry>
499
500 <varlistentry id="systemd-delta">
501 <term><command>systemd-delta</command></term>
502 <listitem>
503 <para>Used to identify and compare configuration files in
504 <filename class="directory">/etc</filename> that override default
505 counterparts in <filename class="directory">/usr</filename></para>
506 <indexterm zone="ch-system-systemd systemd-delta">
507 <primary sortas="b-systemd-delta">systemd-delta</primary>
508 </indexterm>
509 </listitem>
510 </varlistentry>
511
512 <varlistentry id="systemd-detect-virt">
513 <term><command>systemd-detect-virt</command></term>
514 <listitem>
515 <para>Detects execution in a virtualized environment</para>
516 <indexterm zone="ch-system-systemd systemd-detect-virt">
517 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
518 </indexterm>
519 </listitem>
520 </varlistentry>
521
522 <varlistentry id="systemd-escape">
523 <term><command>systemd-escape</command></term>
524 <listitem>
525 <para>Used to escape strings for inclusion in systemd unit
526 names</para>
527 <indexterm zone="ch-system-systemd systemd-escape">
528 <primary sortas="b-systemd-escape">systemd-escape</primary>
529 </indexterm>
530 </listitem>
531 </varlistentry>
532
533 <varlistentry id="systemd-hwdb">
534 <term><command>systemd-hwdb</command></term>
535 <listitem>
536 <para>Used to manage hardware database (hwdb)</para>
537 <indexterm zone="ch-system-systemd systemd-hwdb">
538 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
539 </indexterm>
540 </listitem>
541 </varlistentry>
542
543 <varlistentry id="systemd-inhibit">
544 <term><command>systemd-inhibit</command></term>
545 <listitem>
546 <para>Used to execute a program with a shutdown, sleep or idle
547 inhibitor lock taken</para>
548 <indexterm zone="ch-system-systemd systemd-inhibit">
549 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
550 </indexterm>
551 </listitem>
552 </varlistentry>
553
554 <varlistentry id="systemd-machine-id-setup">
555 <term><command>systemd-machine-id-setup</command></term>
556 <listitem>
557 <para>Used by system installer tools to initialize the machine ID
558 stored in <filename>/etc/machine-id</filename> at install time with a
559 randomly generated ID</para>
560 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
561 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
562 </indexterm>
563 </listitem>
564 </varlistentry>
565
566 <varlistentry id="systemd-mount">
567 <term><command>systemd-mount</command></term>
568 <listitem>
569 <para>is a tool to temporarily mount or auto-mount a drive.</para>
570 <indexterm zone="ch-system-systemd systemd-mount">
571 <primary sortas="b-systemd-mount">systemd-mount</primary>
572 </indexterm>
573 </listitem>
574 </varlistentry>
575
576 <varlistentry id="systemd-notify">
577 <term><command>systemd-notify</command></term>
578 <listitem>
579 <para>Used by daemon scripts to notify the init system about status
580 changes</para>
581 <indexterm zone="ch-system-systemd systemd-notify">
582 <primary sortas="b-systemd-notify">systemd-notify</primary>
583 </indexterm>
584 </listitem>
585 </varlistentry>
586
587 <varlistentry id="systemd-nspawn">
588 <term><command>systemd-nspawn</command></term>
589 <listitem>
590 <para>Used to run a command or OS in a light-weight namespace
591 container</para>
592 <indexterm zone="ch-system-systemd systemd-nspawn">
593 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
594 </indexterm>
595 </listitem>
596 </varlistentry>
597
598 <varlistentry id="systemd-path">
599 <term><command>systemd-path</command></term>
600 <listitem>
601 <para>Used to query system and user paths</para>
602 <indexterm zone="ch-system-systemd systemd-path">
603 <primary sortas="b-systemd-path">systemd-path</primary>
604 </indexterm>
605 </listitem>
606 </varlistentry>
607
608 <varlistentry id="systemd-resolve">
609 <term><command>systemd-resolve</command></term>
610 <listitem>
611 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
612 resource records, and services</para>
613 <indexterm zone="ch-system-systemd systemd-resolve">
614 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
615 </indexterm>
616 </listitem>
617 </varlistentry>
618
619 <varlistentry id="systemd-run">
620 <term><command>systemd-run</command></term>
621 <listitem>
622 <para>Used to create and start a transient .service or a .scope unit
623 and run the specified command in it</para>
624 <indexterm zone="ch-system-systemd systemd-run">
625 <primary sortas="b-systemd-run">systemd-run</primary>
626 </indexterm>
627 </listitem>
628 </varlistentry>
629
630 <!-- <varlistentry id="systemd-stdio-bridge">
631 <term><command>systemd-stdio-bridge</command></term>
632 <listitem>
633 <para>To be completed</para>
634 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
635 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
636 </indexterm>
637 </listitem>
638 </varlistentry> -->
639
640 <varlistentry id="systemd-socket-activate">
641 <term><command>systemd-socket-activate</command></term>
642 <listitem>
643 <para>is a tool to listen on socket devices and launch a process upon
644 connection.</para>
645 <indexterm zone="ch-system-systemd systemd-socket-activate">
646 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
647 </indexterm>
648 </listitem>
649 </varlistentry>
650
651 <varlistentry id="systemd-tmpfiles">
652 <term><command>systemd-tmpfiles</command></term>
653 <listitem>
654 <para>Creates, deletes and cleans up volatile and temporary files and
655 directories, based on the configuration file format and location
656 specified in
657 <filename class="directory">tmpfiles.d</filename> directories</para>
658 <indexterm zone="ch-system-systemd systemd-tmpfiles">
659 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
660 </indexterm>
661 </listitem>
662 </varlistentry>
663
664 <varlistentry id="systemd-tty-ask-password-agent">
665 <term><command>systemd-tty-ask-password-agent</command></term>
666 <listitem>
667 <para>Used to list or process pending systemd password requests</para>
668 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
669 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
670 </indexterm>
671 </listitem>
672 </varlistentry>
673
674 <varlistentry id="telinit">
675 <term><command>telinit</command></term>
676 <listitem>
677 <para>Tells <command>init</command> which run-level to change
678 to</para>
679 <indexterm zone="ch-system-systemd telinit">
680 <primary sortas="b-telinit">telinit</primary>
681 </indexterm>
682 </listitem>
683 </varlistentry>
684
685 <varlistentry id="timedatectl">
686 <term><command>timedatectl</command></term>
687 <listitem>
688 <para>Used to query and change the system clock and its settings
689 </para>
690 <indexterm zone="ch-system-systemd timedatectl">
691 <primary sortas="b-timedatectl">timedatectl</primary>
692 </indexterm>
693 </listitem>
694 </varlistentry>
695
696 <varlistentry id="udevadm">
697 <term><command>udevadm</command></term>
698 <listitem>
699 <para>Generic Udev administration tool: controls the udevd daemon,
700 provides info from the Udev database, monitors uevents, waits for
701 uevents to finish, tests Udev configuration, and triggers uevents
702 for a given device</para>
703 <indexterm zone="ch-system-systemd udevadm">
704 <primary sortas="b-udevadm">udevadm</primary>
705 </indexterm>
706 </listitem>
707 </varlistentry>
708
709 <varlistentry id="libsystemd">
710 <term><filename class="libraryfile">libsystemd</filename></term>
711 <listitem>
712 <para>systemd utility library</para>
713 <indexterm zone="ch-system-systemd libsystemd">
714 <primary sortas="c-libsystemd">libsystemd</primary>
715 </indexterm>
716 </listitem>
717 </varlistentry>
718
719 <varlistentry id="libudev">
720 <term><filename class="libraryfile">libudev</filename></term>
721 <listitem>
722 <para>A library to access Udev device information</para>
723 <indexterm zone="ch-system-systemd libudev">
724 <primary sortas="c-libudev">libudev</primary>
725 </indexterm>
726 </listitem>
727 </varlistentry>
728
729 </variablelist>
730
731 </sect2>
732
733</sect1>
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