source: chapter06/systemd.xml@ ebaee02

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Last change on this file since ebaee02 was ebaee02, checked in by Douglas R. Reno <renodr@…>, 3 years ago

In systemd, we specify removing a directory (/usr/lib/rpm). However, we remove the /usr/bin/xsltproc file in the same block, so expand the description

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11568 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-system-systemd" role="wrap" revision="systemd">
9 <?dbhtml filename="systemd.html"?>
10
11 <sect1info condition="script">
12 <productname>systemd</productname>
13 <productnumber>&systemd-version;</productnumber>
14 <address>&systemd-url;</address>
15 </sect1info>
16
17 <title>Systemd-&systemd-version;</title>
18
19 <indexterm zone="ch-system-systemd">
20 <primary sortas="a-systemd">systemd</primary>
21 </indexterm>
22
23 <sect2 role="package">
24 <title/>
25
26 <para>The systemd package contains programs for controlling the startup,
27 running, and shutdown of the system.</para>
28
29 <segmentedlist>
30 <segtitle>&buildtime;</segtitle>
31 <segtitle>&diskspace;</segtitle>
32
33 <seglistitem>
34 <seg>&systemd-ch6-sbu;</seg>
35 <seg>&systemd-ch6-du;</seg>
36 </seglistitem>
37 </segmentedlist>
38 </sect2>
39
40 <sect2 role="installation">
41 <title>Installation of systemd</title>
42 <!--
43 <para>Apply a patch to fix two critical security vulnerabilities:</para>
44
45<screen><userinput remap="pre">patch -Np1 -i ../systemd-240-security_fixes-2.patch</userinput></screen>
46 -->
47
48 <para>Create a symlink to work around missing xsltproc:</para>
49
50<screen><userinput remap="pre">ln -sf /tools/bin/true /usr/bin/xsltproc</userinput></screen>
51
52 <para>Because we have not yet installed the final version of Util-Linux,
53 create links to the libraries in the approprite location:</para>
54
55<screen><userinput remap="pre">for file in /tools/lib/lib{blkid,mount,uuid}*; do
56 ln -sf $file /usr/lib/
57done</userinput></screen>
58
59 <para>Set up the man pages:</para>
60
61<screen><userinput remap="pre">tar -xf ../systemd-man-pages-&systemd-version;.tar.xz</userinput></screen>
62
63 <para>Remove tests that cannot be built in chroot:</para>
64
65<screen><userinput remap="pre">sed '177,$ d' -i src/resolve/meson.build</userinput></screen>
66
67 <para>Remove an unneeded group,
68 <systemitem class="groupname">render</systemitem>, from the default udev
69 rules:</para>
70
71<screen><userinput remap="pre">sed -i 's/GROUP="render", //' rules/50-udev-default.rules.in</userinput></screen>
72
73 <para>Prepare systemd for compilation:</para>
74
75 <screen><userinput remap="configure">mkdir -p build
76cd build
77
78PKG_CONFIG_PATH="/usr/lib/pkgconfig:/tools/lib/pkgconfig" \
79LANG=en_US.UTF-8 \
80meson --prefix=/usr \
81 --sysconfdir=/etc \
82 --localstatedir=/var \
83 -Dblkid=true \
84 -Dbuildtype=release \
85 -Ddefault-dnssec=no \
86 -Dfirstboot=false \
87 -Dinstall-tests=false \
88 -Dkill-path=/bin/kill \
89 -Dkmod-path=/bin/kmod \
90 -Dldconfig=false \
91 -Dmount-path=/bin/mount \
92 -Drootprefix= \
93 -Drootlibdir=/lib \
94 -Dsplit-usr=true \
95 -Dsulogin-path=/sbin/sulogin \
96 -Dsysusers=false \
97 -Dumount-path=/bin/umount \
98 -Db_lto=false \
99 ..</userinput></screen>
100
101 <variablelist>
102 <title>The meaning of the meson options:</title>
103
104 <varlistentry>
105 <term><parameter>-D*-path=*</parameter></term>
106 <listitem>
107 <para>These switches provide location of binaries needed by
108 systemd at runtime that have not yet been installed, or who's
109 pkgconfig files are currently only in
110 <filename>/tools/lib/pkgconfig</filename>.</para>
111 </listitem>
112 </varlistentry>
113
114 <varlistentry>
115 <term><parameter>-Ddefault-dnssec=no</parameter></term>
116 <listitem>
117 <para>This switch turns off the experimental DNSSEC support.</para>
118 </listitem>
119 </varlistentry>
120
121 <varlistentry>
122 <term><parameter>-Dfirstboot=false</parameter></term>
123 <listitem>
124 <para>This switch prevents installation of systemd
125 services responsible for setting up the system for
126 the first time. They are not useful for LFS because
127 everything is done manually.</para>
128 </listitem>
129 </varlistentry>
130
131 <varlistentry>
132 <term><parameter>-Dinstall-tests=false</parameter></term>
133 <listitem>
134 <para>This switch prevents installation of the compiled tests.</para>
135 </listitem>
136 </varlistentry>
137
138 <varlistentry>
139 <term><parameter>-Dldconfig=false</parameter></term>
140 <listitem>
141 <para>This switch prevents installation of a systemd unit that runs
142 <command>ldconfig</command> at boot, which is not useful for source
143 distributions such as LFS and makes the boot time longer. Remove it
144 if the described feature is desired.</para>
145 </listitem>
146 </varlistentry>
147
148 <varlistentry>
149 <term><parameter>-Droot*</parameter></term>
150 <listitem>
151 <para>These switches ensure that core programs and
152 shared libraries are installed in the subdirectories
153 of the root partition.</para>
154 </listitem>
155 </varlistentry>
156
157 <varlistentry>
158 <term><parameter>-Dsplit-usr=true</parameter></term>
159 <listitem>
160 <para>This switch ensures that systemd will work on
161 systems where /bin, /lib and /sbin directories are not
162 symlinks to their /usr counterparts.</para>
163 </listitem>
164 </varlistentry>
165
166 <varlistentry>
167 <term><parameter>-Dsysusers=false</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 earlier in this chapter.</para>
174 </listitem>
175 </varlistentry>
176
177 </variablelist>
178
179 <para>Compile the package:</para>
180
181<screen><userinput remap="make">LANG=en_US.UTF-8 ninja</userinput></screen>
182<!--
183 <para>To test the package, execute the following command:</para>
184
185<screen><userinput remap="test">LANG=en_US.UTF-8 ninja test</userinput></screen>
186-->
187 <para>Install the package:</para>
188
189<screen><userinput remap="install">LANG=en_US.UTF-8 ninja install</userinput></screen>
190
191 <para>Remove an unnecessary directory and file:</para>
192
193<screen><userinput remap="install">rm -rfv /usr/lib/rpm
194rm -f /usr/bin/xsltproc</userinput></screen>
195
196 <para>Create the <filename>/etc/machine-id</filename> file needed by
197 <command>systemd-journald</command>:</para>
198
199<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
200
201 <para>Create the <filename>/lib/systemd/systemd-user-sessions</filename>
202 script to allow unprivileged user logins without
203 <application>systemd-logind</application>:</para>
204
205<screen><userinput remap="adjust">cat &gt; /lib/systemd/systemd-user-sessions &lt;&lt; "EOF"
206#!/bin/bash
207rm -f /run/nologin
208EOF
209chmod 755 /lib/systemd/systemd-user-sessions</userinput></screen>
210
211 </sect2>
212
213 <sect2 id="contents-systemd" role="content">
214 <title>Contents of systemd</title>
215
216 <segmentedlist>
217 <segtitle>Installed programs</segtitle>
218 <segtitle>Installed libraries</segtitle>
219 <segtitle>Installed directories</segtitle>
220
221 <seglistitem>
222 <seg>bootctl, busctl, coredumpctl, halt (symlink to systemctl),
223 hostnamectl, init, journalctl, kernel-install, localectl, loginctl,
224 machinectl, networkctl, portablectl, poweroff (symlink to
225 systemctl), reboot (symlink to systemctl), resolvconf (symlink to
226 resolvectl), resolvectl, runlevel (symlink to systemctl), shutdown
227 (symlink to systemctl), systemctl, systemd-analyze,
228 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
229 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
230 systemd-id128, systemd-inhibit, systemd-machine-id-setup,
231 systemd-mount, systemd-notify, systemd-nspawn, systemd-path,
232 systemd-resolve (symlink to resolvectl), systemd-run,
233 systemd-socket-activate, systemd-stdio-bridge, systemd-tmpfiles,
234 systemd-tty-ask-password-agent, systemd-umount (symlink to
235 systemd-mount), telinit (symlink to systemctl), timedatectl, and
236 udevadm</seg>
237 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
238 libnss_resolve.so.2, libnss_systemd.so.2,
239 libsystemd.so, libsystemd-shared-&systemd-version;.so (in /lib/systemd),
240 and libudev.so</seg>
241 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
242 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
243 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
244 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
245 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
246 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
247 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
248 </seglistitem>
249 </segmentedlist>
250
251 <variablelist>
252 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
253 <?dbfo list-presentation="list"?>
254 <?dbhtml list-presentation="table"?>
255
256 <varlistentry id="bootctl">
257 <term><command>bootctl</command></term>
258 <listitem>
259 <para>Used to query the firmware and boot manager settings</para>
260 <indexterm zone="ch-system-systemd bootctl">
261 <primary sortas="b-bootctl">bootctl</primary>
262 </indexterm>
263 </listitem>
264 </varlistentry>
265
266 <varlistentry id="busctl">
267 <term><command>busctl</command></term>
268 <listitem>
269 <para>Used to introspect and monitor the D-Bus bus</para>
270 <indexterm zone="ch-system-systemd busctl">
271 <primary sortas="b-busctl">busctl</primary>
272 </indexterm>
273 </listitem>
274 </varlistentry>
275
276 <varlistentry id="coredumpctl">
277 <term><command>coredumpctl</command></term>
278 <listitem>
279 <para>Used to retrieve coredumps from the systemd journal</para>
280 <indexterm zone="ch-system-systemd coredumpctl">
281 <primary sortas="b-coredumpctl">coredumpctl</primary>
282 </indexterm>
283 </listitem>
284 </varlistentry>
285
286 <varlistentry id="halt">
287 <term><command>halt</command></term>
288 <listitem>
289 <para>Normally invokes <command>shutdown</command> with the
290 <parameter>-h</parameter> option, except when already in run-level 0,
291 then it tells the kernel to halt the system; it notes in the
292 file <filename>/var/log/wtmp</filename> that the system is being
293 brought down</para>
294 <indexterm zone="ch-system-systemd halt">
295 <primary sortas="b-halt">halt</primary>
296 </indexterm>
297 </listitem>
298 </varlistentry>
299
300 <varlistentry id="hostnamectl">
301 <term><command>hostnamectl</command></term>
302 <listitem>
303 <para>Used to query and change the system hostname and related
304 settings</para>
305 <indexterm zone="ch-system-systemd hostnamectl">
306 <primary sortas="b-hostnamectl">hostnamectl</primary>
307 </indexterm>
308 </listitem>
309 </varlistentry>
310
311 <varlistentry id="init">
312 <term><command>init</command></term>
313 <listitem>
314 <para>The first process to be started when the kernel has initialized
315 the hardware which takes over the boot process and starts all
316 processes according to its configuration files</para>
317 <indexterm zone="ch-system-systemd init">
318 <primary sortas="b-init">init</primary>
319 </indexterm>
320 </listitem>
321 </varlistentry>
322
323 <varlistentry id="journalctl">
324 <term><command>journalctl</command></term>
325 <listitem>
326 <para>Used to query the contents of the systemd journal</para>
327 <indexterm zone="ch-system-systemd journalctl">
328 <primary sortas="b-journalctl">journalctl</primary>
329 </indexterm>
330 </listitem>
331 </varlistentry>
332
333 <varlistentry id="kernel-install">
334 <term><command>kernel-install</command></term>
335 <listitem>
336 <para>Used to add and remove kernel and initramfs images to and
337 from /boot</para>
338 <indexterm zone="ch-system-systemd kernel-install">
339 <primary sortas="b-kernel-install">kernel-install</primary>
340 </indexterm>
341 </listitem>
342 </varlistentry>
343
344 <varlistentry id="localectl">
345 <term><command>localectl</command></term>
346 <listitem>
347 <para>Used to query and change the system locale and keyboard layout
348 settings</para>
349 <indexterm zone="ch-system-systemd localectl">
350 <primary sortas="b-localectl">localectl</primary>
351 </indexterm>
352 </listitem>
353 </varlistentry>
354
355 <varlistentry id="loginctl">
356 <term><command>loginctl</command></term>
357 <listitem>
358 <para>Used to introspect and control the state of the systemd Login
359 Manager</para>
360 <indexterm zone="ch-system-systemd loginctl">
361 <primary sortas="b-loginctl">loginctl</primary>
362 </indexterm>
363 </listitem>
364 </varlistentry>
365
366 <varlistentry id="machinectl">
367 <term><command>machinectl</command></term>
368 <listitem>
369 <para>Used to introspect and control the state of the systemd Virtual
370 Machine and Container Registration Manager</para>
371 <indexterm zone="ch-system-systemd machinectl">
372 <primary sortas="b-machinectl">machinectl</primary>
373 </indexterm>
374 </listitem>
375 </varlistentry>
376
377 <varlistentry id="networkctl">
378 <term><command>networkctl</command></term>
379 <listitem>
380 <para>Used to introspect the state of the network links as seen by
381 systemd-networkd</para>
382 <indexterm zone="ch-system-systemd networkctl">
383 <primary sortas="b-networkctl">networkctl</primary>
384 </indexterm>
385 </listitem>
386 </varlistentry>
387
388 <varlistentry id="portablectl">
389 <term><command>portablectl</command></term>
390 <listitem>
391 <para>Used to attach or detach portable services from the local
392 system</para>
393 <indexterm zone="ch-system-systemd portablectl">
394 <primary sortas="b-portablectl">portablectl</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="resolvconf">
422 <term><command>resolvconf</command></term>
423 <listitem>
424 <para>Register DNS server and domain configuration with
425 <command>systemd-resolved</command></para>
426 <indexterm zone="ch-system-systemd resolvconf">
427 <primary sortas="b-resolvconf">resolvconf</primary>
428 </indexterm>
429 </listitem>
430 </varlistentry>
431
432 <varlistentry id="resolvectl">
433 <term><command>resolvectl</command></term>
434 <listitem>
435 <para>Send control commands to the network name resolution
436 manager, or resolve domain names, IPv4 and IPv6 addresses,
437 DNS records, and services.</para>
438 <indexterm zone="ch-system-systemd resolvectl">
439 <primary sortas="b-resolvectl">resolvectl</primary>
440 </indexterm>
441 </listitem>
442 </varlistentry>
443
444 <varlistentry id="runlevel">
445 <term><command>runlevel</command></term>
446 <listitem>
447 <para>Reports the previous and the current run-level, as noted in the
448 last run-level record in <filename>/var/run/utmp</filename></para>
449 <indexterm zone="ch-system-systemd runlevel">
450 <primary sortas="b-runlevel">runlevel</primary>
451 </indexterm>
452 </listitem>
453 </varlistentry>
454
455 <varlistentry id="shutdown">
456 <term><command>shutdown</command></term>
457 <listitem>
458 <para>Brings the system down in a secure way, signaling all processes
459 and notifying all logged-in users</para>
460 <indexterm zone="ch-system-systemd shutdown">
461 <primary sortas="b-shutdown">shutdown</primary>
462 </indexterm>
463 </listitem>
464 </varlistentry>
465
466 <varlistentry id="systemctl">
467 <term><command>systemctl</command></term>
468 <listitem>
469 <para>Used to introspect and control the state of the systemd system
470 and service manager</para>
471 <indexterm zone="ch-system-systemd systemctl">
472 <primary sortas="b-systemctl">systemctl</primary>
473 </indexterm>
474 </listitem>
475 </varlistentry>
476
477 <varlistentry id="systemd-analyze">
478 <term><command>systemd-analyze</command></term>
479 <listitem>
480 <para>Used to determine system boot-up performance of the current
481 boot</para>
482 <indexterm zone="ch-system-systemd systemd-analyze">
483 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
484 </indexterm>
485 </listitem>
486 </varlistentry>
487
488 <varlistentry id="systemd-ask-password">
489 <term><command>systemd-ask-password</command></term>
490 <listitem>
491 <para>Used to query a system password or passphrase from the user,
492 using a question message specified on the command line</para>
493 <indexterm zone="ch-system-systemd systemd-ask-password">
494 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
495 </indexterm>
496 </listitem>
497 </varlistentry>
498
499 <varlistentry id="systemd-cat">
500 <term><command>systemd-cat</command></term>
501 <listitem>
502 <para>Used to connect STDOUT and STDERR of a process with the Journal
503 </para>
504 <indexterm zone="ch-system-systemd systemd-cat">
505 <primary sortas="b-systemd-cat">systemd-cat</primary>
506 </indexterm>
507 </listitem>
508 </varlistentry>
509
510 <varlistentry id="systemd-cgls">
511 <term><command>systemd-cgls</command></term>
512 <listitem>
513 <para>Recursively shows the contents of the selected Linux control
514 group hierarchy in a tree</para>
515 <indexterm zone="ch-system-systemd systemd-cgls">
516 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
517 </indexterm>
518 </listitem>
519 </varlistentry>
520
521 <varlistentry id="systemd-cgtop">
522 <term><command>systemd-cgtop</command></term>
523 <listitem>
524 <para>Shows the top control groups of the local Linux control group
525 hierarchy, ordered by their CPU, memory and disk I/O load</para>
526 <indexterm zone="ch-system-systemd systemd-cgtop">
527 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
528 </indexterm>
529 </listitem>
530 </varlistentry>
531
532 <varlistentry id="systemd-delta">
533 <term><command>systemd-delta</command></term>
534 <listitem>
535 <para>Used to identify and compare configuration files in
536 <filename class="directory">/etc</filename> that override default
537 counterparts in <filename class="directory">/usr</filename></para>
538 <indexterm zone="ch-system-systemd systemd-delta">
539 <primary sortas="b-systemd-delta">systemd-delta</primary>
540 </indexterm>
541 </listitem>
542 </varlistentry>
543
544 <varlistentry id="systemd-detect-virt">
545 <term><command>systemd-detect-virt</command></term>
546 <listitem>
547 <para>Detects execution in a virtualized environment</para>
548 <indexterm zone="ch-system-systemd systemd-detect-virt">
549 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
550 </indexterm>
551 </listitem>
552 </varlistentry>
553
554 <varlistentry id="systemd-escape">
555 <term><command>systemd-escape</command></term>
556 <listitem>
557 <para>Used to escape strings for inclusion in systemd unit
558 names</para>
559 <indexterm zone="ch-system-systemd systemd-escape">
560 <primary sortas="b-systemd-escape">systemd-escape</primary>
561 </indexterm>
562 </listitem>
563 </varlistentry>
564
565 <varlistentry id="systemd-hwdb">
566 <term><command>systemd-hwdb</command></term>
567 <listitem>
568 <para>Used to manage hardware database (hwdb)</para>
569 <indexterm zone="ch-system-systemd systemd-hwdb">
570 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
571 </indexterm>
572 </listitem>
573 </varlistentry>
574
575 <varlistentry id="systemd-id128">
576 <term><command>systemd-id128</command></term>
577 <listitem>
578 <para>Generate and print id128 strings</para>
579 <indexterm zone="ch-system-systemd systemd-id128">
580 <primary sortas="b-systemd-id128">systemd-id128</primary>
581 </indexterm>
582 </listitem>
583 </varlistentry>
584
585 <varlistentry id="systemd-inhibit">
586 <term><command>systemd-inhibit</command></term>
587 <listitem>
588 <para>Used to execute a program with a shutdown, sleep or idle
589 inhibitor lock taken</para>
590 <indexterm zone="ch-system-systemd systemd-inhibit">
591 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
592 </indexterm>
593 </listitem>
594 </varlistentry>
595
596 <varlistentry id="systemd-machine-id-setup">
597 <term><command>systemd-machine-id-setup</command></term>
598 <listitem>
599 <para>Used by system installer tools to initialize the machine ID
600 stored in <filename>/etc/machine-id</filename> at install time with a
601 randomly generated ID</para>
602 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
603 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
604 </indexterm>
605 </listitem>
606 </varlistentry>
607
608 <varlistentry id="systemd-mount">
609 <term><command>systemd-mount</command></term>
610 <listitem>
611 <para>A tool to temporarily mount or auto-mount a drive.</para>
612 <indexterm zone="ch-system-systemd systemd-mount">
613 <primary sortas="b-systemd-mount">systemd-mount</primary>
614 </indexterm>
615 </listitem>
616 </varlistentry>
617
618 <varlistentry id="systemd-notify">
619 <term><command>systemd-notify</command></term>
620 <listitem>
621 <para>Used by daemon scripts to notify the init system about status
622 changes</para>
623 <indexterm zone="ch-system-systemd systemd-notify">
624 <primary sortas="b-systemd-notify">systemd-notify</primary>
625 </indexterm>
626 </listitem>
627 </varlistentry>
628
629 <varlistentry id="systemd-nspawn">
630 <term><command>systemd-nspawn</command></term>
631 <listitem>
632 <para>Used to run a command or OS in a light-weight namespace
633 container</para>
634 <indexterm zone="ch-system-systemd systemd-nspawn">
635 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
636 </indexterm>
637 </listitem>
638 </varlistentry>
639
640 <varlistentry id="systemd-path">
641 <term><command>systemd-path</command></term>
642 <listitem>
643 <para>Used to query system and user paths</para>
644 <indexterm zone="ch-system-systemd systemd-path">
645 <primary sortas="b-systemd-path">systemd-path</primary>
646 </indexterm>
647 </listitem>
648 </varlistentry>
649
650 <varlistentry id="systemd-resolve">
651 <term><command>systemd-resolve</command></term>
652 <listitem>
653 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
654 resource records, and services</para>
655 <indexterm zone="ch-system-systemd systemd-resolve">
656 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
657 </indexterm>
658 </listitem>
659 </varlistentry>
660
661 <varlistentry id="systemd-run">
662 <term><command>systemd-run</command></term>
663 <listitem>
664 <para>Used to create and start a transient .service or a .scope unit
665 and run the specified command in it</para>
666 <indexterm zone="ch-system-systemd systemd-run">
667 <primary sortas="b-systemd-run">systemd-run</primary>
668 </indexterm>
669 </listitem>
670 </varlistentry>
671
672 <!-- <varlistentry id="systemd-stdio-bridge">
673 <term><command>systemd-stdio-bridge</command></term>
674 <listitem>
675 <para>To be completed</para>
676 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
677 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
678 </indexterm>
679 </listitem>
680 </varlistentry> -->
681
682 <varlistentry id="systemd-socket-activate">
683 <term><command>systemd-socket-activate</command></term>
684 <listitem>
685 <para>A tool to listen on socket devices and launch a process upon
686 connection.</para>
687 <indexterm zone="ch-system-systemd systemd-socket-activate">
688 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
689 </indexterm>
690 </listitem>
691 </varlistentry>
692
693 <varlistentry id="systemd-tmpfiles">
694 <term><command>systemd-tmpfiles</command></term>
695 <listitem>
696 <para>Creates, deletes and cleans up volatile and temporary files and
697 directories, based on the configuration file format and location
698 specified in
699 <filename class="directory">tmpfiles.d</filename> directories</para>
700 <indexterm zone="ch-system-systemd systemd-tmpfiles">
701 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
702 </indexterm>
703 </listitem>
704 </varlistentry>
705
706 <varlistentry id="systemd-umount">
707 <term><command>systemd-umount</command></term>
708 <listitem>
709 <para>Unmount mount points</para>
710 <indexterm zone="ch-system-systemd systemd-umount">
711 <primary sortas="b-systemd-umount">systemd-umount</primary>
712 </indexterm>
713 </listitem>
714 </varlistentry>
715
716 <varlistentry id="systemd-tty-ask-password-agent">
717 <term><command>systemd-tty-ask-password-agent</command></term>
718 <listitem>
719 <para>Used to list or process pending systemd password requests</para>
720 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
721 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
722 </indexterm>
723 </listitem>
724 </varlistentry>
725
726 <varlistentry id="telinit">
727 <term><command>telinit</command></term>
728 <listitem>
729 <para>Tells <command>init</command> which run-level to change
730 to</para>
731 <indexterm zone="ch-system-systemd telinit">
732 <primary sortas="b-telinit">telinit</primary>
733 </indexterm>
734 </listitem>
735 </varlistentry>
736
737 <varlistentry id="timedatectl">
738 <term><command>timedatectl</command></term>
739 <listitem>
740 <para>Used to query and change the system clock and its settings
741 </para>
742 <indexterm zone="ch-system-systemd timedatectl">
743 <primary sortas="b-timedatectl">timedatectl</primary>
744 </indexterm>
745 </listitem>
746 </varlistentry>
747
748 <varlistentry id="udevadm">
749 <term><command>udevadm</command></term>
750 <listitem>
751 <para>Generic udev administration tool: controls the udevd daemon,
752 provides info from the Udev database, monitors uevents, waits for
753 uevents to finish, tests udev configuration, and triggers uevents
754 for a given device</para>
755 <indexterm zone="ch-system-systemd udevadm">
756 <primary sortas="b-udevadm">udevadm</primary>
757 </indexterm>
758 </listitem>
759 </varlistentry>
760
761 <varlistentry id="libsystemd">
762 <term><filename class="libraryfile">libsystemd</filename></term>
763 <listitem>
764 <para>The main systemd utility library</para>
765 <indexterm zone="ch-system-systemd libsystemd">
766 <primary sortas="c-libsystemd">libsystemd</primary>
767 </indexterm>
768 </listitem>
769 </varlistentry>
770
771 <varlistentry id="libudev">
772 <term><filename class="libraryfile">libudev</filename></term>
773 <listitem>
774 <para>A library to access Udev device information</para>
775 <indexterm zone="ch-system-systemd libudev">
776 <primary sortas="c-libudev">libudev</primary>
777 </indexterm>
778 </listitem>
779 </varlistentry>
780
781 </variablelist>
782
783 </sect2>
784
785</sect1>
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