source: chapter06/systemd.xml@ f5b18de

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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-system-systemd" role="wrap" revision="systemd">
9 <?dbhtml filename="systemd.html"?>
10
11 <sect1info condition="script">
12 <productname>systemd</productname>
13 <productnumber>&systemd-version;</productnumber>
14 <address>&systemd-url;</address>
15 </sect1info>
16
17 <title>Systemd-&systemd-version;</title>
18
19 <indexterm zone="ch-system-systemd">
20 <primary sortas="a-systemd">systemd</primary>
21 </indexterm>
22
23 <sect2 role="package">
24 <title/>
25
26 <para>The systemd package contains programs for controlling the startup,
27 running, and shutdown of the system.</para>
28
29 <segmentedlist>
30 <segtitle>&buildtime;</segtitle>
31 <segtitle>&diskspace;</segtitle>
32
33 <seglistitem>
34 <seg>&systemd-ch6-sbu;</seg>
35 <seg>&systemd-ch6-du;</seg>
36 </seglistitem>
37 </segmentedlist>
38 </sect2>
39
40 <sect2 role="installation">
41 <title>Installation of systemd</title>
42
43 <para>First, fix a build error when using Util-Linux built in
44 Chapter 5:</para>
45
46<screen><userinput remap="pre">sed -i "s:blkid/::" $(grep -rl "blkid/blkid.h")</userinput></screen>
47
48<!-- Not needed as of 231. -renodr
49 <para>Fix a potential security issue with framebuffer devices:</para>
50
51<screen><userinput remap="pre">sed -e 's@DRI and frame buffer@DRI@' \
52 -e '/SUBSYSTEM==\"graphics\", KERNEL==\"fb\*\"/d' \
53 -i src/login/70-uaccess.rules</userinput></screen>
54-->
55
56 <para>Disable two tests that always fail:</para>
57
58<screen><userinput remap="pre">sed -e 's@test/udev-test.pl @@' \
59 -e 's@test-copy$(EXEEXT) @@' \
60 -i Makefile.in</userinput></screen>
61
62 <para>Rebuild generated files after modifying Makefile.am and
63 Makefile.in:</para>
64
65<screen><userinput remap="pre">autoreconf -fi</userinput></screen>
66
67 <para>Create a file to allow systemd to build when using Util-Linux
68 built in Chapter 5, to disable LTO by default, and to build without
69 xlstproc:</para>
70
71<screen><userinput remap="pre">cat &gt; config.cache &lt;&lt; "EOF"
72<literal>KILL=/bin/kill
73MOUNT_PATH=/bin/mount
74UMOUNT_PATH=/bin/umount
75HAVE_BLKID=1
76BLKID_LIBS="-lblkid"
77BLKID_CFLAGS="-I/tools/include/blkid"
78HAVE_LIBMOUNT=1
79MOUNT_LIBS="-lmount"
80MOUNT_CFLAGS="-I/tools/include/libmount"
81cc_cv_CFLAGS__flto=no
82XSLTPROC="/usr/bin/xsltproc"</literal>
83EOF</userinput></screen>
84
85 <para>LTO is disabled by default because it causes
86 <command>systemd</command> and other auxiliary programs to link to
87 <filename class="libraryfile">libgcc_s.so</filename>, slows the build down
88 and makes the compiled code larger.</para>
89
90 <para>Prepare systemd for compilation:</para>
91
92<screen><userinput remap="configure">./configure --prefix=/usr \
93 --sysconfdir=/etc \
94 --localstatedir=/var \
95 --config-cache \
96 --with-rootprefix= \
97 --with-rootlibdir=/lib \
98 --enable-split-usr \
99 --disable-firstboot \
100 --disable-ldconfig \
101 --disable-sysusers \
102 --without-python \
103 --with-default-dnssec=no \
104 --docdir=/usr/share/doc/systemd-&systemd-version;</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-default-dnssec=no</parameter></term>
179 <listitem>
180 <para>This switch turns off the experimental DNSSEC suport.</para>
181 </listitem>
182 </varlistentry>
183
184 </variablelist>
185
186 <para>Compile the package:</para>
187
188<screen><userinput remap="make">make LIBRARY_PATH=/tools/lib</userinput></screen>
189
190 <para>This package has a test suite, but it can only be run after the
191 package has been installed.</para>
192
193 <para>Install the package:</para>
194
195<screen><userinput remap="install">make LD_LIBRARY_PATH=/tools/lib install</userinput></screen>
196
197 <para>Move the NSS libraries to <filename class="directory">/lib</filename>:</para>
198
199<screen><userinput remap="install">mv -v /usr/lib/libnss_{myhostname,mymachines,resolve}.so.2 /lib</userinput></screen>
200
201 <para>Remove an unnecessary directory:</para>
202
203<screen><userinput remap="install">rm -rfv /usr/lib/rpm</userinput></screen>
204
205 <para>Create the Sysvinit compatibility symlinks, so systemd is used
206 as the default init system:</para>
207
208<screen><userinput remap="install">for tool in runlevel reboot shutdown poweroff halt telinit; do
209 ln -sfv ../bin/systemctl /sbin/${tool}
210done
211ln -sfv ../lib/systemd/systemd /sbin/init</userinput></screen>
212
213<!--
214 <para>Remove a reference to a non-existent group:</para>
215
216<screen><userinput remap="install">sed -i "s:0775 root lock:0755 root root:g" /usr/lib/tmpfiles.d/legacy.conf</userinput></screen>
217-->
218
219 <para>Create the <filename>/etc/machine-id</filename> file needed by
220 <command>systemd-journald</command>:</para>
221
222<screen><userinput remap="install">systemd-machine-id-setup</userinput></screen>
223
224 <para>Fix a broken symlink created by the systemd installation process:</para>
225<screen><userinput remap="install">rm -fv /etc/resolv.conf
226ln -s ../lib/systemd/resolv.conf /etc/resolv.conf</userinput></screen>
227
228 <para>Since the testsuite largely depends on the host system kernel
229 configuration, some tests may fail. It also needs a modification in
230 order not to look for a program that will be installed by Util-Linux
231 package later in this chapter. To test the results, issue:</para>
232
233<screen><userinput remap="test">sed -i "s:minix:ext4:g" src/test/test-path-util.c
234make LD_LIBRARY_PATH=/tools/lib -k check</userinput></screen>
235
236 </sect2>
237
238 <sect2 id="contents-systemd" role="content">
239 <title>Contents of systemd</title>
240
241 <segmentedlist>
242 <segtitle>Installed programs</segtitle>
243 <segtitle>Installed libraries</segtitle>
244 <segtitle>Installed directories</segtitle>
245
246 <seglistitem>
247 <seg>bootctl, busctl, coredumpctl, halt, hostnamectl, init, journalctl,
248 kernel-install, localectl, loginctl, machinectl, networkctl, poweroff,
249 reboot, runlevel, shutdown, systemctl, systemd-analyze,
250 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
251 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
252 systemd-inhibit, systemd-machine-id-setup, systemd-notify,
253 systemd-nspawn, systemd-path, systemd-resolve, systemd-run,
254 systemd-stdio-bridge, systemd-tmpfiles, systemd-tty-ask-password-agent,
255 telinit, timedatectl, and udevadm</seg>
256 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
257 libnss_resolve.so.2, libsystemd.so, libsystemd-shared-231.so,
258 and libudev.so</seg>
259 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
260 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
261 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
262 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
263 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
264 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
265 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
266 </seglistitem>
267 </segmentedlist>
268
269 <variablelist>
270 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
271 <?dbfo list-presentation="list"?>
272 <?dbhtml list-presentation="table"?>
273
274 <varlistentry id="bootctl">
275 <term><command>bootctl</command></term>
276 <listitem>
277 <para>used to query the firmware and boot manager settings</para>
278 <indexterm zone="ch-system-systemd bootctl">
279 <primary sortas="b-bootctl">bootctl</primary>
280 </indexterm>
281 </listitem>
282 </varlistentry>
283
284 <varlistentry id="busctl">
285 <term><command>busctl</command></term>
286 <listitem>
287 <para>Used to introspect and monitor the D-Bus bus</para>
288 <indexterm zone="ch-system-systemd busctl">
289 <primary sortas="b-busctl">busctl</primary>
290 </indexterm>
291 </listitem>
292 </varlistentry>
293
294 <varlistentry id="coredumpctl">
295 <term><command>coredumpctl</command></term>
296 <listitem>
297 <para>Used to retrieve coredumps from the systemd Journal</para>
298 <indexterm zone="ch-system-systemd coredumpctl">
299 <primary sortas="b-coredumpctl">coredumpctl</primary>
300 </indexterm>
301 </listitem>
302 </varlistentry>
303
304 <varlistentry id="halt">
305 <term><command>halt</command></term>
306 <listitem>
307 <para>Normally invokes <command>shutdown</command> with the
308 <parameter>-h</parameter> option, except when already in run-level 0,
309 then it tells the kernel to halt the system; it notes in the
310 file <filename>/var/log/wtmp</filename> that the system is being
311 brought down</para>
312 <indexterm zone="ch-system-systemd halt">
313 <primary sortas="b-halt">halt</primary>
314 </indexterm>
315 </listitem>
316 </varlistentry>
317
318 <varlistentry id="hostnamectl">
319 <term><command>hostnamectl</command></term>
320 <listitem>
321 <para>Used to query and change the system hostname and related
322 settings</para>
323 <indexterm zone="ch-system-systemd hostnamectl">
324 <primary sortas="b-hostnamectl">hostnamectl</primary>
325 </indexterm>
326 </listitem>
327 </varlistentry>
328
329 <varlistentry id="init">
330 <term><command>init</command></term>
331 <listitem>
332 <para>The first process to be started when the kernel has initialized
333 the hardware which takes over the boot process and starts all the
334 proceses it is instructed to</para>
335 <indexterm zone="ch-system-systemd init">
336 <primary sortas="b-init">init</primary>
337 </indexterm>
338 </listitem>
339 </varlistentry>
340
341 <varlistentry id="journalctl">
342 <term><command>journalctl</command></term>
343 <listitem>
344 <para>Used to query the contents of the systemd Journal</para>
345 <indexterm zone="ch-system-systemd journalctl">
346 <primary sortas="b-journalctl">journalctl</primary>
347 </indexterm>
348 </listitem>
349 </varlistentry>
350
351 <varlistentry id="kernel-install">
352 <term><command>kernel-install</command></term>
353 <listitem>
354 <para>Used to add and remove kernel and initramfs images to and
355 from /boot</para>
356 <indexterm zone="ch-system-systemd kernel-install">
357 <primary sortas="b-kernel-install">kernel-install</primary>
358 </indexterm>
359 </listitem>
360 </varlistentry>
361
362 <varlistentry id="localectl">
363 <term><command>localectl</command></term>
364 <listitem>
365 <para>Used to query and change the system locale and keyboard layout
366 settings</para>
367 <indexterm zone="ch-system-systemd localectl">
368 <primary sortas="b-localectl">localectl</primary>
369 </indexterm>
370 </listitem>
371 </varlistentry>
372
373 <varlistentry id="loginctl">
374 <term><command>loginctl</command></term>
375 <listitem>
376 <para>Used to introspect and control the state of the systemd Login
377 Manager</para>
378 <indexterm zone="ch-system-systemd loginctl">
379 <primary sortas="b-loginctl">loginctl</primary>
380 </indexterm>
381 </listitem>
382 </varlistentry>
383
384 <varlistentry id="machinectl">
385 <term><command>machinectl</command></term>
386 <listitem>
387 <para>Used to introspect and control the state of the systemd Virtual
388 Machine and Container Registration Manager</para>
389 <indexterm zone="ch-system-systemd machinectl">
390 <primary sortas="b-machinectl">machinectl</primary>
391 </indexterm>
392 </listitem>
393 </varlistentry>
394
395 <varlistentry id="networkctl">
396 <term><command>networkctl</command></term>
397 <listitem>
398 <para>Used to introspect the state of the network links as seen by
399 systemd-networkd</para>
400 <indexterm zone="ch-system-systemd networkctl">
401 <primary sortas="b-networkctl">networkctl</primary>
402 </indexterm>
403 </listitem>
404 </varlistentry>
405
406 <varlistentry id="poweroff">
407 <term><command>poweroff</command></term>
408 <listitem>
409 <para>Tells the kernel to halt the system and switch off the computer
410 (see <command>halt</command>)</para>
411 <indexterm zone="ch-system-systemd poweroff">
412 <primary sortas="b-poweroff">poweroff</primary>
413 </indexterm>
414 </listitem>
415 </varlistentry>
416
417 <varlistentry id="reboot">
418 <term><command>reboot</command></term>
419 <listitem>
420 <para>Tells the kernel to reboot the system (see
421 <command>halt</command>)</para>
422 <indexterm zone="ch-system-systemd reboot">
423 <primary sortas="b-reboot">reboot</primary>
424 </indexterm>
425 </listitem>
426 </varlistentry>
427
428 <varlistentry id="runlevel">
429 <term><command>runlevel</command></term>
430 <listitem>
431 <para>Reports the previous and the current run-level, as noted in the
432 last run-level record in <filename>/var/run/utmp</filename></para>
433 <indexterm zone="ch-system-systemd runlevel">
434 <primary sortas="b-runlevel">runlevel</primary>
435 </indexterm>
436 </listitem>
437 </varlistentry>
438
439 <varlistentry id="shutdown">
440 <term><command>shutdown</command></term>
441 <listitem>
442 <para>Brings the system down in a secure way, signaling all processes
443 and notifying all logged-in users</para>
444 <indexterm zone="ch-system-systemd shutdown">
445 <primary sortas="b-shutdown">shutdown</primary>
446 </indexterm>
447 </listitem>
448 </varlistentry>
449
450 <varlistentry id="systemctl">
451 <term><command>systemctl</command></term>
452 <listitem>
453 <para>Used to introspect and control the state of the systemd system
454 and service manager</para>
455 <indexterm zone="ch-system-systemd systemctl">
456 <primary sortas="b-systemctl">systemctl</primary>
457 </indexterm>
458 </listitem>
459 </varlistentry>
460
461 <varlistentry id="systemd-analyze">
462 <term><command>systemd-analyze</command></term>
463 <listitem>
464 <para>Used to determine system boot-up performance of the current
465 boot</para>
466 <indexterm zone="ch-system-systemd systemd-analyze">
467 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
468 </indexterm>
469 </listitem>
470 </varlistentry>
471
472 <varlistentry id="systemd-ask-password">
473 <term><command>systemd-ask-password</command></term>
474 <listitem>
475 <para>Used to query a system password or passphrase from the user,
476 using a question message specified on the command line</para>
477 <indexterm zone="ch-system-systemd systemd-ask-password">
478 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
479 </indexterm>
480 </listitem>
481 </varlistentry>
482
483 <varlistentry id="systemd-cat">
484 <term><command>systemd-cat</command></term>
485 <listitem>
486 <para>Used to connect STDOUT and STDERR of a process with the Journal
487 </para>
488 <indexterm zone="ch-system-systemd systemd-cat">
489 <primary sortas="b-systemd-cat">systemd-cat</primary>
490 </indexterm>
491 </listitem>
492 </varlistentry>
493
494 <varlistentry id="systemd-cgls">
495 <term><command>systemd-cgls</command></term>
496 <listitem>
497 <para>Recursively shows the contents of the selected Linux control
498 group hierarchy in a tree</para>
499 <indexterm zone="ch-system-systemd systemd-cgls">
500 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
501 </indexterm>
502 </listitem>
503 </varlistentry>
504
505 <varlistentry id="systemd-cgtop">
506 <term><command>systemd-cgtop</command></term>
507 <listitem>
508 <para>Shows the top control groups of the local Linux control group
509 hierarchy, ordered by their CPU, memory and disk I/O load</para>
510 <indexterm zone="ch-system-systemd systemd-cgtop">
511 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
512 </indexterm>
513 </listitem>
514 </varlistentry>
515
516 <varlistentry id="systemd-delta">
517 <term><command>systemd-delta</command></term>
518 <listitem>
519 <para>Used to identify and compare configuration files in
520 <filename class="directory">/etc</filename> that override default
521 counterparts in <filename class="directory">/usr</filename></para>
522 <indexterm zone="ch-system-systemd systemd-delta">
523 <primary sortas="b-systemd-delta">systemd-delta</primary>
524 </indexterm>
525 </listitem>
526 </varlistentry>
527
528 <varlistentry id="systemd-detect-virt">
529 <term><command>systemd-detect-virt</command></term>
530 <listitem>
531 <para>Detects execution in a virtualized environment</para>
532 <indexterm zone="ch-system-systemd systemd-detect-virt">
533 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
534 </indexterm>
535 </listitem>
536 </varlistentry>
537
538 <varlistentry id="systemd-escape">
539 <term><command>systemd-escape</command></term>
540 <listitem>
541 <para>Used to escape strings for inclusion in systemd unit
542 names</para>
543 <indexterm zone="ch-system-systemd systemd-escape">
544 <primary sortas="b-systemd-escape">systemd-escape</primary>
545 </indexterm>
546 </listitem>
547 </varlistentry>
548
549 <varlistentry id="systemd-hwdb">
550 <term><command>systemd-hwdb</command></term>
551 <listitem>
552 <para>Used to manage hardware database (hwdb)</para>
553 <indexterm zone="ch-system-systemd systemd-hwdb">
554 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
555 </indexterm>
556 </listitem>
557 </varlistentry>
558
559 <varlistentry id="systemd-inhibit">
560 <term><command>systemd-inhibit</command></term>
561 <listitem>
562 <para>Used to execute a program with a shutdown, sleep or idle
563 inhibitor lock taken</para>
564 <indexterm zone="ch-system-systemd systemd-inhibit">
565 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
566 </indexterm>
567 </listitem>
568 </varlistentry>
569
570 <varlistentry id="systemd-machine-id-setup">
571 <term><command>systemd-machine-id-setup</command></term>
572 <listitem>
573 <para>Used by system installer tools to initialize the machine ID
574 stored in <filename>/etc/machine-id</filename> at install time with a
575 randomly generated ID</para>
576 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
577 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
578 </indexterm>
579 </listitem>
580 </varlistentry>
581
582 <varlistentry id="systemd-notify">
583 <term><command>systemd-notify</command></term>
584 <listitem>
585 <para>Used by daemon scripts to notify the init system about status
586 changes</para>
587 <indexterm zone="ch-system-systemd systemd-notify">
588 <primary sortas="b-systemd-notify">systemd-notify</primary>
589 </indexterm>
590 </listitem>
591 </varlistentry>
592
593 <varlistentry id="systemd-nspawn">
594 <term><command>systemd-nspawn</command></term>
595 <listitem>
596 <para>Used to run a command or OS in a light-weight namespace
597 container</para>
598 <indexterm zone="ch-system-systemd systemd-nspawn">
599 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
600 </indexterm>
601 </listitem>
602 </varlistentry>
603
604 <varlistentry id="systemd-path">
605 <term><command>systemd-path</command></term>
606 <listitem>
607 <para>Used to query system and user paths</para>
608 <indexterm zone="ch-system-systemd systemd-path">
609 <primary sortas="b-systemd-path">systemd-path</primary>
610 </indexterm>
611 </listitem>
612 </varlistentry>
613
614 <varlistentry id="systemd-resolve">
615 <term><command>systemd-resolve</command></term>
616 <listitem>
617 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
618 resource records, and services</para>
619 <indexterm zone="ch-system-systemd systemd-resolve">
620 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
621 </indexterm>
622 </listitem>
623 </varlistentry>
624
625 <varlistentry id="systemd-run">
626 <term><command>systemd-run</command></term>
627 <listitem>
628 <para>Used to create and start a transient .service or a .scope unit
629 and run the specified command in it</para>
630 <indexterm zone="ch-system-systemd systemd-run">
631 <primary sortas="b-systemd-run">systemd-run</primary>
632 </indexterm>
633 </listitem>
634 </varlistentry>
635
636 <!-- <varlistentry id="systemd-stdio-bridge">
637 <term><command>systemd-stdio-bridge</command></term>
638 <listitem>
639 <para>To be completed</para>
640 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
641 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
642 </indexterm>
643 </listitem>
644 </varlistentry> -->
645
646 <varlistentry id="systemd-tmpfiles">
647 <term><command>systemd-tmpfiles</command></term>
648 <listitem>
649 <para>Creates, deletes and cleans up volatile and temporary files and
650 directories, based on the configuration file format and location
651 specified in
652 <filename class="directory">tmpfiles.d</filename> directories</para>
653 <indexterm zone="ch-system-systemd systemd-tmpfiles">
654 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
655 </indexterm>
656 </listitem>
657 </varlistentry>
658
659 <varlistentry id="systemd-tty-ask-password-agent">
660 <term><command>systemd-tty-ask-password-agent</command></term>
661 <listitem>
662 <para>Used to list or process pending systemd password requests</para>
663 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
664 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
665 </indexterm>
666 </listitem>
667 </varlistentry>
668
669 <varlistentry id="telinit">
670 <term><command>telinit</command></term>
671 <listitem>
672 <para>Tells <command>init</command> which run-level to change
673 to</para>
674 <indexterm zone="ch-system-systemd telinit">
675 <primary sortas="b-telinit">telinit</primary>
676 </indexterm>
677 </listitem>
678 </varlistentry>
679
680 <varlistentry id="timedatectl">
681 <term><command>timedatectl</command></term>
682 <listitem>
683 <para>Used to query and change the system clock and its settings
684 </para>
685 <indexterm zone="ch-system-systemd timedatectl">
686 <primary sortas="b-timedatectl">timedatectl</primary>
687 </indexterm>
688 </listitem>
689 </varlistentry>
690
691 <varlistentry id="udevadm">
692 <term><command>udevadm</command></term>
693 <listitem>
694 <para>Generic Udev administration tool: controls the udevd daemon,
695 provides info from the Udev database, monitors uevents, waits for
696 uevents to finish, tests Udev configuration, and triggers uevents
697 for a given device</para>
698 <indexterm zone="ch-system-systemd udevadm">
699 <primary sortas="b-udevadm">udevadm</primary>
700 </indexterm>
701 </listitem>
702 </varlistentry>
703
704 <varlistentry id="libsystemd">
705 <term><filename class="libraryfile">libsystemd</filename></term>
706 <listitem>
707 <para>systemd utility library</para>
708 <indexterm zone="ch-system-systemd libsystemd">
709 <primary sortas="c-libsystemd">libsystemd</primary>
710 </indexterm>
711 </listitem>
712 </varlistentry>
713
714 <varlistentry id="libudev">
715 <term><filename class="libraryfile">libudev</filename></term>
716 <listitem>
717 <para>A library to access Udev device information</para>
718 <indexterm zone="ch-system-systemd libudev">
719 <primary sortas="c-libudev">libudev</primary>
720 </indexterm>
721 </listitem>
722 </varlistentry>
723
724 </variablelist>
725
726 </sect2>
727
728</sect1>
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