source: chapter06/systemd.xml@ ee46f60

7.9-systemd
Last change on this file since ee46f60 was 26ae89a, checked in by DJ Lucas <dj@…>, 8 years ago

Fix systemd chapter 6 build, move util-linux back to end of chapter 6, remove sysmlink for /etc/resolv.conf

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/branches/systemd@10985 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/::" $(grep -rl "blkid/blkid.h")</userinput></screen>
47
48 <para>Apply the following patch so that compat
49 <command>pkg-config</command> files get installed without installing compat
50 libs which are useless on LFS:</para>
51
52<screen><userinput remap="pre">patch -Np1 -i ../&systemd-compat-patch;</userinput></screen>
53
54 <para>Disable two tests that always fail:</para>
55
56<screen><userinput remap="pre">sed -e 's:test/udev-test.pl ::g' \
57 -e 's:test-copy$(EXEEXT) ::g' \
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 <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 <para>Create the <filename>/etc/machine-id</filename> file needed by
219 <command>systemd-journald</command>:</para>
220
221<screen><userinput remap="install">systemd-machine-id-setup</userinput></screen>
222
223 <para>Since the testsuite largely depends on the host system kernel
224 configuration, some tests may fail. It also needs a modification in
225 order not to look for a program that will be installed by Util-Linux
226 package later in this chapter. To test the results, issue:</para>
227
228<screen><userinput remap="test">sed -i "s:minix:ext4:g" src/test/test-path-util.c
229make LD_LIBRARY_PATH=/tools/lib -k check</userinput></screen>
230
231 </sect2>
232
233 <sect2 id="contents-systemd" role="content">
234 <title>Contents of systemd</title>
235
236 <segmentedlist>
237 <segtitle>Installed programs</segtitle>
238 <segtitle>Installed libraries</segtitle>
239 <segtitle>Installed directories</segtitle>
240
241 <seglistitem>
242 <seg>bootctl, busctl, coredumpctl, halt, hostnamectl, init, journalctl,
243 kernel-install, localectl, loginctl, machinectl, networkctl, poweroff,
244 reboot, runlevel, shutdown, systemctl, systemd-analyze,
245 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
246 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
247 systemd-inhibit, systemd-machine-id-setup, systemd-notify, systemd-nspawn,
248 systemd-path, systemd-run, systemd-stdio-bridge, systemd-tmpfiles,
249 systemd-tty-ask-password-agent, telinit, timedatectl, and udevadm</seg>
250 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2, libnss_resolve.so.2,
251 libsystemd.so, and libudev.so</seg>
252 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
253 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
254 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
255 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
256 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
257 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
258 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
259 </seglistitem>
260 </segmentedlist>
261
262 <variablelist>
263 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
264 <?dbfo list-presentation="list"?>
265 <?dbhtml list-presentation="table"?>
266
267 <varlistentry id="bootctl">
268 <term><command>bootctl</command></term>
269 <listitem>
270 <para>used to query the firmware and boot manager settings</para>
271 <indexterm zone="ch-system-systemd bootctl">
272 <primary sortas="b-bootctl">bootctl</primary>
273 </indexterm>
274 </listitem>
275 </varlistentry>
276
277 <varlistentry id="busctl">
278 <term><command>busctl</command></term>
279 <listitem>
280 <para>Used to introspect and monitor the D-Bus bus</para>
281 <indexterm zone="ch-system-systemd busctl">
282 <primary sortas="b-busctl">busctl</primary>
283 </indexterm>
284 </listitem>
285 </varlistentry>
286
287 <varlistentry id="coredumpctl">
288 <term><command>coredumpctl</command></term>
289 <listitem>
290 <para>Used to retrieve coredumps from the systemd Journal</para>
291 <indexterm zone="ch-system-systemd coredumpctl">
292 <primary sortas="b-coredumpctl">coredumpctl</primary>
293 </indexterm>
294 </listitem>
295 </varlistentry>
296
297 <varlistentry id="halt">
298 <term><command>halt</command></term>
299 <listitem>
300 <para>Normally invokes <command>shutdown</command> with the
301 <parameter>-h</parameter> option, except when already in run-level 0,
302 then it tells the kernel to halt the system; it notes in the
303 file <filename>/var/log/wtmp</filename> that the system is being
304 brought down</para>
305 <indexterm zone="ch-system-systemd halt">
306 <primary sortas="b-halt">halt</primary>
307 </indexterm>
308 </listitem>
309 </varlistentry>
310
311 <varlistentry id="hostnamectl">
312 <term><command>hostnamectl</command></term>
313 <listitem>
314 <para>Used to query and change the system hostname and related
315 settings</para>
316 <indexterm zone="ch-system-systemd hostnamectl">
317 <primary sortas="b-hostnamectl">hostnamectl</primary>
318 </indexterm>
319 </listitem>
320 </varlistentry>
321
322 <varlistentry id="init">
323 <term><command>init</command></term>
324 <listitem>
325 <para>The first process to be started when the kernel has initialized
326 the hardware which takes over the boot process and starts all the
327 proceses it is instructed to</para>
328 <indexterm zone="ch-system-systemd init">
329 <primary sortas="b-init">init</primary>
330 </indexterm>
331 </listitem>
332 </varlistentry>
333
334 <varlistentry id="journalctl">
335 <term><command>journalctl</command></term>
336 <listitem>
337 <para>Used to query the contents of the systemd Journal</para>
338 <indexterm zone="ch-system-systemd journalctl">
339 <primary sortas="b-journalctl">journalctl</primary>
340 </indexterm>
341 </listitem>
342 </varlistentry>
343
344 <varlistentry id="kernel-install">
345 <term><command>kernel-install</command></term>
346 <listitem>
347 <para>Used to add and remove kernel and initramfs images to and
348 from /boot</para>
349 <indexterm zone="ch-system-systemd kernel-install">
350 <primary sortas="b-kernel-install">kernel-install</primary>
351 </indexterm>
352 </listitem>
353 </varlistentry>
354
355 <varlistentry id="localectl">
356 <term><command>localectl</command></term>
357 <listitem>
358 <para>Used to query and change the system locale and keyboard layout
359 settings</para>
360 <indexterm zone="ch-system-systemd localectl">
361 <primary sortas="b-localectl">localectl</primary>
362 </indexterm>
363 </listitem>
364 </varlistentry>
365
366 <varlistentry id="loginctl">
367 <term><command>loginctl</command></term>
368 <listitem>
369 <para>Used to introspect and control the state of the systemd Login
370 Manager</para>
371 <indexterm zone="ch-system-systemd loginctl">
372 <primary sortas="b-loginctl">loginctl</primary>
373 </indexterm>
374 </listitem>
375 </varlistentry>
376
377 <varlistentry id="machinectl">
378 <term><command>machinectl</command></term>
379 <listitem>
380 <para>Used to introspect and control the state of the systemd Virtual
381 Machine and Container Registration Manager</para>
382 <indexterm zone="ch-system-systemd machinectl">
383 <primary sortas="b-machinectl">machinectl</primary>
384 </indexterm>
385 </listitem>
386 </varlistentry>
387
388 <varlistentry id="networkctl">
389 <term><command>networkctl</command></term>
390 <listitem>
391 <para>Used to introspect the state of the network links as seen by
392 systemd-networkd</para>
393 <indexterm zone="ch-system-systemd networkctl">
394 <primary sortas="b-networkctl">networkctl</primary>
395 </indexterm>
396 </listitem>
397 </varlistentry>
398
399 <varlistentry id="poweroff">
400 <term><command>poweroff</command></term>
401 <listitem>
402 <para>Tells the kernel to halt the system and switch off the computer
403 (see <command>halt</command>)</para>
404 <indexterm zone="ch-system-systemd poweroff">
405 <primary sortas="b-poweroff">poweroff</primary>
406 </indexterm>
407 </listitem>
408 </varlistentry>
409
410 <varlistentry id="reboot">
411 <term><command>reboot</command></term>
412 <listitem>
413 <para>Tells the kernel to reboot the system (see
414 <command>halt</command>)</para>
415 <indexterm zone="ch-system-systemd reboot">
416 <primary sortas="b-reboot">reboot</primary>
417 </indexterm>
418 </listitem>
419 </varlistentry>
420
421 <varlistentry id="runlevel">
422 <term><command>runlevel</command></term>
423 <listitem>
424 <para>Reports the previous and the current run-level, as noted in the
425 last run-level record in <filename>/var/run/utmp</filename></para>
426 <indexterm zone="ch-system-systemd runlevel">
427 <primary sortas="b-runlevel">runlevel</primary>
428 </indexterm>
429 </listitem>
430 </varlistentry>
431
432 <varlistentry id="shutdown">
433 <term><command>shutdown</command></term>
434 <listitem>
435 <para>Brings the system down in a secure way, signaling all processes
436 and notifying all logged-in users</para>
437 <indexterm zone="ch-system-systemd shutdown">
438 <primary sortas="b-shutdown">shutdown</primary>
439 </indexterm>
440 </listitem>
441 </varlistentry>
442
443 <varlistentry id="systemctl">
444 <term><command>systemctl</command></term>
445 <listitem>
446 <para>Used to introspect and control the state of the systemd system and
447 service manager</para>
448 <indexterm zone="ch-system-systemd systemctl">
449 <primary sortas="b-systemctl">systemctl</primary>
450 </indexterm>
451 </listitem>
452 </varlistentry>
453
454 <varlistentry id="systemd-analyze">
455 <term><command>systemd-analyze</command></term>
456 <listitem>
457 <para>Used to determine system boot-up performance of the current boot
458 </para>
459 <indexterm zone="ch-system-systemd systemd-analyze">
460 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
461 </indexterm>
462 </listitem>
463 </varlistentry>
464
465 <varlistentry id="systemd-ask-password">
466 <term><command>systemd-ask-password</command></term>
467 <listitem>
468 <para>Used to query a system password or passphrase from the user, using a
469 question message specified on the command line</para>
470 <indexterm zone="ch-system-systemd systemd-ask-password">
471 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
472 </indexterm>
473 </listitem>
474 </varlistentry>
475
476 <varlistentry id="systemd-cat">
477 <term><command>systemd-cat</command></term>
478 <listitem>
479 <para>Used to connect STDOUT and STDERR of a process with the Journal
480 </para>
481 <indexterm zone="ch-system-systemd systemd-cat">
482 <primary sortas="b-systemd-cat">systemd-cat</primary>
483 </indexterm>
484 </listitem>
485 </varlistentry>
486
487 <varlistentry id="systemd-cgls">
488 <term><command>systemd-cgls</command></term>
489 <listitem>
490 <para>Recursively shows the contents of the selected Linux control group
491 hierarchy in a tree</para>
492 <indexterm zone="ch-system-systemd systemd-cgls">
493 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
494 </indexterm>
495 </listitem>
496 </varlistentry>
497
498 <varlistentry id="systemd-cgtop">
499 <term><command>systemd-cgtop</command></term>
500 <listitem>
501 <para>Shows the top control groups of the local Linux control group hierarchy,
502 ordered by their CPU, memory and disk I/O load</para>
503 <indexterm zone="ch-system-systemd systemd-cgtop">
504 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
505 </indexterm>
506 </listitem>
507 </varlistentry>
508
509 <varlistentry id="systemd-delta">
510 <term><command>systemd-delta</command></term>
511 <listitem>
512 <para>Used to identify and compare configuration files in
513 <filename class="directory">/etc</filename> that override default
514 counterparts in <filename class="directory">/usr</filename></para>
515 <indexterm zone="ch-system-systemd systemd-delta">
516 <primary sortas="b-systemd-delta">systemd-delta</primary>
517 </indexterm>
518 </listitem>
519 </varlistentry>
520
521 <varlistentry id="systemd-detect-virt">
522 <term><command>systemd-detect-virt</command></term>
523 <listitem>
524 <para>Detects execution in a virtualized environment</para>
525 <indexterm zone="ch-system-systemd systemd-detect-virt">
526 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
527 </indexterm>
528 </listitem>
529 </varlistentry>
530
531 <varlistentry id="systemd-escape">
532 <term><command>systemd-escape</command></term>
533 <listitem>
534 <para>Used to escape strings for inclusion in systemd unit names</para>
535 <indexterm zone="ch-system-systemd systemd-escape">
536 <primary sortas="b-systemd-escape">systemd-escape</primary>
537 </indexterm>
538 </listitem>
539 </varlistentry>
540
541 <varlistentry id="systemd-hwdb">
542 <term><command>systemd-hwdb</command></term>
543 <listitem>
544 <para>Used to manage hardware database (hwdb)</para>
545 <indexterm zone="ch-system-systemd systemd-hwdb">
546 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
547 </indexterm>
548 </listitem>
549 </varlistentry>
550
551 <varlistentry id="systemd-inhibit">
552 <term><command>systemd-inhibit</command></term>
553 <listitem>
554 <para>Used to execute a program with a shutdown, sleep or idle inhibitor lock
555 taken</para>
556 <indexterm zone="ch-system-systemd systemd-inhibit">
557 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
558 </indexterm>
559 </listitem>
560 </varlistentry>
561
562 <varlistentry id="systemd-machine-id-setup">
563 <term><command>systemd-machine-id-setup</command></term>
564 <listitem>
565 <para>Used by system installer tools to initialize the machine ID stored in
566 <filename>/etc/machine-id</filename> at install time with a randomly
567 generated ID</para>
568 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
569 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
570 </indexterm>
571 </listitem>
572 </varlistentry>
573
574 <varlistentry id="systemd-notify">
575 <term><command>systemd-notify</command></term>
576 <listitem>
577 <para>Used by daemon scripts to notify the init system about status changes
578 </para>
579 <indexterm zone="ch-system-systemd systemd-notify">
580 <primary sortas="b-systemd-notify">systemd-notify</primary>
581 </indexterm>
582 </listitem>
583 </varlistentry>
584
585 <varlistentry id="systemd-nspawn">
586 <term><command>systemd-nspawn</command></term>
587 <listitem>
588 <para>Used to run a command or OS in a light-weight namespace container</para>
589 <indexterm zone="ch-system-systemd systemd-nspawn">
590 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
591 </indexterm>
592 </listitem>
593 </varlistentry>
594
595 <varlistentry id="systemd-path">
596 <term><command>systemd-path</command></term>
597 <listitem>
598 <para>Used to query system and user paths</para>
599 <indexterm zone="ch-system-systemd systemd-path">
600 <primary sortas="b-systemd-path">systemd-path</primary>
601 </indexterm>
602 </listitem>
603 </varlistentry>
604
605 <varlistentry id="systemd-run">
606 <term><command>systemd-run</command></term>
607 <listitem>
608 <para>Used to create and start a transient .service or a .scope unit and
609 run the specified command in it</para>
610 <indexterm zone="ch-system-systemd systemd-run">
611 <primary sortas="b-systemd-run">systemd-run</primary>
612 </indexterm>
613 </listitem>
614 </varlistentry>
615
616 <!-- <varlistentry id="systemd-stdio-bridge">
617 <term><command>systemd-stdio-bridge</command></term>
618 <listitem>
619 <para>To be completed</para>
620 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
621 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
622 </indexterm>
623 </listitem>
624 </varlistentry> -->
625
626 <varlistentry id="systemd-tmpfiles">
627 <term><command>systemd-tmpfiles</command></term>
628 <listitem>
629 <para>Creates, deletes and cleans up volatile and temporary files and directories,
630 based on the configuration file format and location specified in
631 <filename class="directory">tmpfiles.d</filename> directories</para>
632 <indexterm zone="ch-system-systemd systemd-tmpfiles">
633 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
634 </indexterm>
635 </listitem>
636 </varlistentry>
637
638 <varlistentry id="systemd-tty-ask-password-agent">
639 <term><command>systemd-tty-ask-password-agent</command></term>
640 <listitem>
641 <para>Used to list or process pending systemd password requests</para>
642 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
643 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
644 </indexterm>
645 </listitem>
646 </varlistentry>
647
648 <varlistentry id="telinit">
649 <term><command>telinit</command></term>
650 <listitem>
651 <para>Tells <command>init</command> which run-level to change to</para>
652 <indexterm zone="ch-system-systemd telinit">
653 <primary sortas="b-telinit">telinit</primary>
654 </indexterm>
655 </listitem>
656 </varlistentry>
657
658 <varlistentry id="timedatectl">
659 <term><command>timedatectl</command></term>
660 <listitem>
661 <para>Used to query and change the system clock and its settings
662 </para>
663 <indexterm zone="ch-system-systemd timedatectl">
664 <primary sortas="b-timedatectl">timedatectl</primary>
665 </indexterm>
666 </listitem>
667 </varlistentry>
668
669 <varlistentry id="udevadm">
670 <term><command>udevadm</command></term>
671 <listitem>
672 <para>Generic Udev administration tool: controls the udevd daemon,
673 provides info from the Udev database, monitors uevents, waits for
674 uevents to finish, tests Udev configuration, and triggers uevents
675 for a given device</para>
676 <indexterm zone="ch-system-systemd udevadm">
677 <primary sortas="b-udevadm">udevadm</primary>
678 </indexterm>
679 </listitem>
680 </varlistentry>
681
682 <varlistentry id="libsystemd">
683 <term><filename class="libraryfile">libsystemd</filename></term>
684 <listitem>
685 <para>systemd utility library</para>
686 <indexterm zone="ch-system-systemd libsystemd">
687 <primary sortas="c-libsystemd">libsystemd</primary>
688 </indexterm>
689 </listitem>
690 </varlistentry>
691
692 <varlistentry id="libudev">
693 <term><filename class="libraryfile">libudev</filename></term>
694 <listitem>
695 <para>A library to access Udev device information</para>
696 <indexterm zone="ch-system-systemd libudev">
697 <primary sortas="c-libudev">libudev</primary>
698 </indexterm>
699 </listitem>
700 </varlistentry>
701
702 </variablelist>
703
704 </sect2>
705
706</sect1>
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