source: chapter06/systemd.xml@ de7a8b3

7.9-systemd 7.9-systemd-rc1 7.9-systemd-rc2 systemd
Last change on this file since de7a8b3 was de7a8b3, checked in by DJ Lucas <dj@…>, 6 years ago

Update to systemd-229.

git-svn-id: http://svn.linuxfromscratch.org/LFS/branches/systemd@11006 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">
9 <?dbhtml filename="systemd.html"?>
10
11 <sect1info condition="script">
12 <productname>systemd</productname>
13 <productnumber>&systemd-version;</productnumber>
14 <address>&systemd-url;</address>
15 </sect1info>
16
17 <title>Systemd-&systemd-version;</title>
18
19 <indexterm zone="ch-system-systemd">
20 <primary sortas="a-systemd">systemd</primary>
21 </indexterm>
22
23 <sect2 role="package">
24 <title/>
25
26 <para>The systemd package contains programs for controlling the startup,
27 running, and shutdown of the system.</para>
28
29 <segmentedlist>
30 <segtitle>&buildtime;</segtitle>
31 <segtitle>&diskspace;</segtitle>
32
33 <seglistitem>
34 <seg>&systemd-ch6-sbu;</seg>
35 <seg>&systemd-ch6-du;</seg>
36 </seglistitem>
37 </segmentedlist>
38 </sect2>
39
40 <sect2 role="installation">
41 <title>Installation of systemd</title>
42
43 <para>First, fix a build error when using Util-Linux built in
44 Chapter 5:</para>
45
46<screen><userinput remap="pre">sed -i "s:blkid/::" $(grep -rl "blkid/blkid.h")</userinput></screen>
47
48 <para>Apply the following patch so that compat
49 <command>pkg-config</command> files get installed without installing compat
50 libs which are useless on LFS:</para>
51
52<screen><userinput remap="pre">patch -Np1 -i ../&systemd-compat-patch;</userinput></screen>
53
54 <para>Disable two tests that always fail:</para>
55
56<screen><userinput remap="pre">sed -e 's@test/udev-test.pl @@' \
57 -e 's@test-copy$(EXEEXT) @@' \
58 -i Makefile.in</userinput></screen>
59
60 <para>Rebuild generated files after modifying Makefile.am and
61 Makefile.in:</para>
62
63<screen><userinput remap="pre">autoreconf -fi</userinput></screen>
64
65 <para>Create a file to allow systemd to build when using Util-Linux
66 built in Chapter 5, to disable LTO by default, and to build without
67 xlstproc:</para>
68
69<screen><userinput remap="pre">cat &gt; config.cache &lt;&lt; "EOF"
70<literal>KILL=/bin/kill
71MOUNT_PATH=/bin/mount
72UMOUNT_PATH=/bin/umount
73HAVE_BLKID=1
74BLKID_LIBS="-lblkid"
75BLKID_CFLAGS="-I/tools/include/blkid"
76HAVE_LIBMOUNT=1
77MOUNT_LIBS="-lmount"
78MOUNT_CFLAGS="-I/tools/include/libmount"
79cc_cv_CFLAGS__flto=no
80XSLTPROC="/usr/bin/xsltproc"</literal>
81EOF</userinput></screen>
82
83 <para>LTO is disabled by default because it causes
84 <command>systemd</command> and other auxiliary programs to link to
85 <filename class="libraryfile">libgcc_s.so</filename>, slows the build down
86 and makes the compiled code larger.</para>
87
88 <para>Prepare systemd for compilation:</para>
89
90<screen><userinput remap="configure">./configure --prefix=/usr \
91 --sysconfdir=/etc \
92 --localstatedir=/var \
93 --config-cache \
94 --with-rootprefix= \
95 --with-rootlibdir=/lib \
96 --enable-split-usr \
97 --disable-firstboot \
98 --disable-ldconfig \
99 --disable-sysusers \
100 --without-python \
101 --docdir=/usr/share/doc/systemd-&systemd-version; \
102 --with-dbuspolicydir=/etc/dbus-1/system.d \
103 --with-dbussessionservicedir=/usr/share/dbus-1/services \
104 --with-dbussystemservicedir=/usr/share/dbus-1/system-services</userinput></screen>
105
106 <variablelist>
107 <title>The meaning of the configure options:</title>
108
109 <varlistentry>
110 <term><parameter>--config-cache</parameter></term>
111 <listitem>
112 <para>This switch tells the build system to use
113 the <filename>config.cache</filename> file which
114 was created earlier.</para>
115 </listitem>
116 </varlistentry>
117
118 <varlistentry>
119 <term><parameter>--with-root*</parameter></term>
120 <listitem>
121 <para>These switches ensure that core programs and
122 shared libraries are installed in the subdirectories
123 of the root partition.</para>
124 </listitem>
125 </varlistentry>
126
127 <varlistentry>
128 <term><parameter>--enable-split-usr</parameter></term>
129 <listitem>
130 <para>This switch ensures that systemd will work on
131 systems where /bin, /lib and /sbin directories are not
132 symlinks to their /usr counterparts.</para>
133 </listitem>
134 </varlistentry>
135
136 <varlistentry>
137 <term><parameter>--without-python</parameter></term>
138 <listitem>
139 <para>This switch prevents <command>configure</command>
140 from trying to use Python which isn't built
141 in LFS.</para>
142 </listitem>
143 </varlistentry>
144
145 <varlistentry>
146 <term><parameter>--disable-firstboot</parameter></term>
147 <listitem>
148 <para>This switch prevents installation of systemd
149 services responsible for setting up the system for
150 the first time. They are not useful for LFS because
151 everything is done manually.</para>
152 </listitem>
153 </varlistentry>
154
155 <varlistentry>
156 <term><parameter>--disable-ldconfig</parameter></term>
157 <listitem>
158 <para>This switch prevents installation of a systemd
159 unit that runs <command>ldconfig</command> at
160 boot, making the boot time longer. Remove it if the
161 described feature is desired, even though it's not
162 useful for source distributions such as LFS.</para>
163 </listitem>
164 </varlistentry>
165
166 <varlistentry>
167 <term><parameter>--disable-sysusers</parameter></term>
168 <listitem>
169 <para>This switch prevents installation of systemd
170 services responsible for setting up the
171 <filename>/etc/group</filename> and
172 <filename>/etc/passwd</filename> files. Both files
173 were created early in this chapter.</para>
174 </listitem>
175 </varlistentry>
176
177 <varlistentry>
178 <term><parameter>--with-dbus*</parameter></term>
179 <listitem>
180 <para>These switches ensure that D-Bus configuration files
181 get installed in the correct locations.</para>
182 </listitem>
183 </varlistentry>
184
185 </variablelist>
186
187 <para>Compile the package:</para>
188
189<screen><userinput remap="make">make LIBRARY_PATH=/tools/lib</userinput></screen>
190
191 <para>This package has a test suite, but it can only be run after the
192 package has been installed.</para>
193
194 <para>Install the package:</para>
195
196<screen><userinput remap="install">make LD_LIBRARY_PATH=/tools/lib install</userinput></screen>
197
198 <para>Move NSS libraries to <filename class="directory">/lib</filename>:</para>
199
200<screen><userinput remap="install">mv -v /usr/lib/libnss_{myhostname,mymachines,resolve}.so.2 /lib</userinput></screen>
201
202 <para>Remove an unnecessary directory:</para>
203
204<screen><userinput remap="install">rm -rfv /usr/lib/rpm</userinput></screen>
205
206 <para>Create the Sysvinit compatibility symlinks, so systemd is used
207 as the default init system:</para>
208
209<screen><userinput remap="install">for tool in runlevel reboot shutdown poweroff halt telinit; do
210 ln -sfv ../bin/systemctl /sbin/${tool}
211done
212ln -sfv ../lib/systemd/systemd /sbin/init</userinput></screen>
213
214<!--
215 <para>Remove a reference to a non-existent group:</para>
216
217<screen><userinput remap="install">sed -i "s:0775 root lock:0755 root root:g" /usr/lib/tmpfiles.d/legacy.conf</userinput></screen>
218-->
219
220 <para>Create the <filename>/etc/machine-id</filename> file needed by
221 <command>systemd-journald</command>:</para>
222
223<screen><userinput remap="install">systemd-machine-id-setup</userinput></screen>
224
225 <para>Since the testsuite largely depends on the host system kernel
226 configuration, some tests may fail. It also needs a modification in
227 order not to look for a program that will be installed by Util-Linux
228 package later in this chapter. To test the results, issue:</para>
229
230<screen><userinput remap="test">sed -i "s:minix:ext4:g" src/test/test-path-util.c
231make LD_LIBRARY_PATH=/tools/lib -k check</userinput></screen>
232
233 </sect2>
234
235 <sect2 id="contents-systemd" role="content">
236 <title>Contents of systemd</title>
237
238 <segmentedlist>
239 <segtitle>Installed programs</segtitle>
240 <segtitle>Installed libraries</segtitle>
241 <segtitle>Installed directories</segtitle>
242
243 <seglistitem>
244 <seg>bootctl, busctl, coredumpctl, halt, hostnamectl, init, journalctl,
245 kernel-install, localectl, loginctl, machinectl, networkctl, poweroff,
246 reboot, runlevel, shutdown, systemctl, systemd-analyze,
247 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
248 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
249 systemd-inhibit, systemd-machine-id-setup, systemd-notify,
250 systemd-nspawn, systemd-path, systemd-resolve, systemd-run,
251 systemd-stdio-bridge, systemd-tmpfiles, systemd-tty-ask-password-agent,
252 telinit, timedatectl, and udevadm</seg>
253 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
254 libnss_resolve.so.2, libsystemd.so, and libudev.so</seg>
255 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
256 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
257 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
258 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
259 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
260 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
261 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
262 </seglistitem>
263 </segmentedlist>
264
265 <variablelist>
266 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
267 <?dbfo list-presentation="list"?>
268 <?dbhtml list-presentation="table"?>
269
270 <varlistentry id="bootctl">
271 <term><command>bootctl</command></term>
272 <listitem>
273 <para>used to query the firmware and boot manager settings</para>
274 <indexterm zone="ch-system-systemd bootctl">
275 <primary sortas="b-bootctl">bootctl</primary>
276 </indexterm>
277 </listitem>
278 </varlistentry>
279
280 <varlistentry id="busctl">
281 <term><command>busctl</command></term>
282 <listitem>
283 <para>Used to introspect and monitor the D-Bus bus</para>
284 <indexterm zone="ch-system-systemd busctl">
285 <primary sortas="b-busctl">busctl</primary>
286 </indexterm>
287 </listitem>
288 </varlistentry>
289
290 <varlistentry id="coredumpctl">
291 <term><command>coredumpctl</command></term>
292 <listitem>
293 <para>Used to retrieve coredumps from the systemd Journal</para>
294 <indexterm zone="ch-system-systemd coredumpctl">
295 <primary sortas="b-coredumpctl">coredumpctl</primary>
296 </indexterm>
297 </listitem>
298 </varlistentry>
299
300 <varlistentry id="halt">
301 <term><command>halt</command></term>
302 <listitem>
303 <para>Normally invokes <command>shutdown</command> with the
304 <parameter>-h</parameter> option, except when already in run-level 0,
305 then it tells the kernel to halt the system; it notes in the
306 file <filename>/var/log/wtmp</filename> that the system is being
307 brought down</para>
308 <indexterm zone="ch-system-systemd halt">
309 <primary sortas="b-halt">halt</primary>
310 </indexterm>
311 </listitem>
312 </varlistentry>
313
314 <varlistentry id="hostnamectl">
315 <term><command>hostnamectl</command></term>
316 <listitem>
317 <para>Used to query and change the system hostname and related
318 settings</para>
319 <indexterm zone="ch-system-systemd hostnamectl">
320 <primary sortas="b-hostnamectl">hostnamectl</primary>
321 </indexterm>
322 </listitem>
323 </varlistentry>
324
325 <varlistentry id="init">
326 <term><command>init</command></term>
327 <listitem>
328 <para>The first process to be started when the kernel has initialized
329 the hardware which takes over the boot process and starts all the
330 proceses it is instructed to</para>
331 <indexterm zone="ch-system-systemd init">
332 <primary sortas="b-init">init</primary>
333 </indexterm>
334 </listitem>
335 </varlistentry>
336
337 <varlistentry id="journalctl">
338 <term><command>journalctl</command></term>
339 <listitem>
340 <para>Used to query the contents of the systemd Journal</para>
341 <indexterm zone="ch-system-systemd journalctl">
342 <primary sortas="b-journalctl">journalctl</primary>
343 </indexterm>
344 </listitem>
345 </varlistentry>
346
347 <varlistentry id="kernel-install">
348 <term><command>kernel-install</command></term>
349 <listitem>
350 <para>Used to add and remove kernel and initramfs images to and
351 from /boot</para>
352 <indexterm zone="ch-system-systemd kernel-install">
353 <primary sortas="b-kernel-install">kernel-install</primary>
354 </indexterm>
355 </listitem>
356 </varlistentry>
357
358 <varlistentry id="localectl">
359 <term><command>localectl</command></term>
360 <listitem>
361 <para>Used to query and change the system locale and keyboard layout
362 settings</para>
363 <indexterm zone="ch-system-systemd localectl">
364 <primary sortas="b-localectl">localectl</primary>
365 </indexterm>
366 </listitem>
367 </varlistentry>
368
369 <varlistentry id="loginctl">
370 <term><command>loginctl</command></term>
371 <listitem>
372 <para>Used to introspect and control the state of the systemd Login
373 Manager</para>
374 <indexterm zone="ch-system-systemd loginctl">
375 <primary sortas="b-loginctl">loginctl</primary>
376 </indexterm>
377 </listitem>
378 </varlistentry>
379
380 <varlistentry id="machinectl">
381 <term><command>machinectl</command></term>
382 <listitem>
383 <para>Used to introspect and control the state of the systemd Virtual
384 Machine and Container Registration Manager</para>
385 <indexterm zone="ch-system-systemd machinectl">
386 <primary sortas="b-machinectl">machinectl</primary>
387 </indexterm>
388 </listitem>
389 </varlistentry>
390
391 <varlistentry id="networkctl">
392 <term><command>networkctl</command></term>
393 <listitem>
394 <para>Used to introspect the state of the network links as seen by
395 systemd-networkd</para>
396 <indexterm zone="ch-system-systemd networkctl">
397 <primary sortas="b-networkctl">networkctl</primary>
398 </indexterm>
399 </listitem>
400 </varlistentry>
401
402 <varlistentry id="poweroff">
403 <term><command>poweroff</command></term>
404 <listitem>
405 <para>Tells the kernel to halt the system and switch off the computer
406 (see <command>halt</command>)</para>
407 <indexterm zone="ch-system-systemd poweroff">
408 <primary sortas="b-poweroff">poweroff</primary>
409 </indexterm>
410 </listitem>
411 </varlistentry>
412
413 <varlistentry id="reboot">
414 <term><command>reboot</command></term>
415 <listitem>
416 <para>Tells the kernel to reboot the system (see
417 <command>halt</command>)</para>
418 <indexterm zone="ch-system-systemd reboot">
419 <primary sortas="b-reboot">reboot</primary>
420 </indexterm>
421 </listitem>
422 </varlistentry>
423
424 <varlistentry id="runlevel">
425 <term><command>runlevel</command></term>
426 <listitem>
427 <para>Reports the previous and the current run-level, as noted in the
428 last run-level record in <filename>/var/run/utmp</filename></para>
429 <indexterm zone="ch-system-systemd runlevel">
430 <primary sortas="b-runlevel">runlevel</primary>
431 </indexterm>
432 </listitem>
433 </varlistentry>
434
435 <varlistentry id="shutdown">
436 <term><command>shutdown</command></term>
437 <listitem>
438 <para>Brings the system down in a secure way, signaling all processes
439 and notifying all logged-in users</para>
440 <indexterm zone="ch-system-systemd shutdown">
441 <primary sortas="b-shutdown">shutdown</primary>
442 </indexterm>
443 </listitem>
444 </varlistentry>
445
446 <varlistentry id="systemctl">
447 <term><command>systemctl</command></term>
448 <listitem>
449 <para>Used to introspect and control the state of the systemd system
450 and service manager</para>
451 <indexterm zone="ch-system-systemd systemctl">
452 <primary sortas="b-systemctl">systemctl</primary>
453 </indexterm>
454 </listitem>
455 </varlistentry>
456
457 <varlistentry id="systemd-analyze">
458 <term><command>systemd-analyze</command></term>
459 <listitem>
460 <para>Used to determine system boot-up performance of the current
461 boot</para>
462 <indexterm zone="ch-system-systemd systemd-analyze">
463 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
464 </indexterm>
465 </listitem>
466 </varlistentry>
467
468 <varlistentry id="systemd-ask-password">
469 <term><command>systemd-ask-password</command></term>
470 <listitem>
471 <para>Used to query a system password or passphrase from the user,
472 using a question message specified on the command line</para>
473 <indexterm zone="ch-system-systemd systemd-ask-password">
474 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
475 </indexterm>
476 </listitem>
477 </varlistentry>
478
479 <varlistentry id="systemd-cat">
480 <term><command>systemd-cat</command></term>
481 <listitem>
482 <para>Used to connect STDOUT and STDERR of a process with the Journal
483 </para>
484 <indexterm zone="ch-system-systemd systemd-cat">
485 <primary sortas="b-systemd-cat">systemd-cat</primary>
486 </indexterm>
487 </listitem>
488 </varlistentry>
489
490 <varlistentry id="systemd-cgls">
491 <term><command>systemd-cgls</command></term>
492 <listitem>
493 <para>Recursively shows the contents of the selected Linux control
494 group hierarchy in a tree</para>
495 <indexterm zone="ch-system-systemd systemd-cgls">
496 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
497 </indexterm>
498 </listitem>
499 </varlistentry>
500
501 <varlistentry id="systemd-cgtop">
502 <term><command>systemd-cgtop</command></term>
503 <listitem>
504 <para>Shows the top control groups of the local Linux control group
505 hierarchy, ordered by their CPU, memory and disk I/O load</para>
506 <indexterm zone="ch-system-systemd systemd-cgtop">
507 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
508 </indexterm>
509 </listitem>
510 </varlistentry>
511
512 <varlistentry id="systemd-delta">
513 <term><command>systemd-delta</command></term>
514 <listitem>
515 <para>Used to identify and compare configuration files in
516 <filename class="directory">/etc</filename> that override default
517 counterparts in <filename class="directory">/usr</filename></para>
518 <indexterm zone="ch-system-systemd systemd-delta">
519 <primary sortas="b-systemd-delta">systemd-delta</primary>
520 </indexterm>
521 </listitem>
522 </varlistentry>
523
524 <varlistentry id="systemd-detect-virt">
525 <term><command>systemd-detect-virt</command></term>
526 <listitem>
527 <para>Detects execution in a virtualized environment</para>
528 <indexterm zone="ch-system-systemd systemd-detect-virt">
529 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
530 </indexterm>
531 </listitem>
532 </varlistentry>
533
534 <varlistentry id="systemd-escape">
535 <term><command>systemd-escape</command></term>
536 <listitem>
537 <para>Used to escape strings for inclusion in systemd unit
538 names</para>
539 <indexterm zone="ch-system-systemd systemd-escape">
540 <primary sortas="b-systemd-escape">systemd-escape</primary>
541 </indexterm>
542 </listitem>
543 </varlistentry>
544
545 <varlistentry id="systemd-hwdb">
546 <term><command>systemd-hwdb</command></term>
547 <listitem>
548 <para>Used to manage hardware database (hwdb)</para>
549 <indexterm zone="ch-system-systemd systemd-hwdb">
550 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
551 </indexterm>
552 </listitem>
553 </varlistentry>
554
555 <varlistentry id="systemd-inhibit">
556 <term><command>systemd-inhibit</command></term>
557 <listitem>
558 <para>Used to execute a program with a shutdown, sleep or idle
559 inhibitor lock taken</para>
560 <indexterm zone="ch-system-systemd systemd-inhibit">
561 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
562 </indexterm>
563 </listitem>
564 </varlistentry>
565
566 <varlistentry id="systemd-machine-id-setup">
567 <term><command>systemd-machine-id-setup</command></term>
568 <listitem>
569 <para>Used by system installer tools to initialize the machine ID
570 stored in <filename>/etc/machine-id</filename> at install time with a
571 randomly generated ID</para>
572 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
573 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
574 </indexterm>
575 </listitem>
576 </varlistentry>
577
578 <varlistentry id="systemd-notify">
579 <term><command>systemd-notify</command></term>
580 <listitem>
581 <para>Used by daemon scripts to notify the init system about status
582 changes</para>
583 <indexterm zone="ch-system-systemd systemd-notify">
584 <primary sortas="b-systemd-notify">systemd-notify</primary>
585 </indexterm>
586 </listitem>
587 </varlistentry>
588
589 <varlistentry id="systemd-nspawn">
590 <term><command>systemd-nspawn</command></term>
591 <listitem>
592 <para>Used to run a command or OS in a light-weight namespace
593 container</para>
594 <indexterm zone="ch-system-systemd systemd-nspawn">
595 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
596 </indexterm>
597 </listitem>
598 </varlistentry>
599
600 <varlistentry id="systemd-path">
601 <term><command>systemd-path</command></term>
602 <listitem>
603 <para>Used to query system and user paths</para>
604 <indexterm zone="ch-system-systemd systemd-path">
605 <primary sortas="b-systemd-path">systemd-path</primary>
606 </indexterm>
607 </listitem>
608 </varlistentry>
609
610 <varlistentry id="systemd-resolve">
611 <term><command>systemd-resolve</command></term>
612 <listitem>
613 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
614 resource records, and services</para>
615 <indexterm zone="ch-system-systemd systemd-resolve">
616 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
617 </indexterm>
618 </listitem>
619 </varlistentry>
620
621 <varlistentry id="systemd-run">
622 <term><command>systemd-run</command></term>
623 <listitem>
624 <para>Used to create and start a transient .service or a .scope unit
625 and run the specified command in it</para>
626 <indexterm zone="ch-system-systemd systemd-run">
627 <primary sortas="b-systemd-run">systemd-run</primary>
628 </indexterm>
629 </listitem>
630 </varlistentry>
631
632 <!-- <varlistentry id="systemd-stdio-bridge">
633 <term><command>systemd-stdio-bridge</command></term>
634 <listitem>
635 <para>To be completed</para>
636 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
637 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</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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