source: chapter06/systemd.xml@ 8a0d39ee

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Last change on this file since 8a0d39ee was 8a0d39ee, checked in by Douglas R. Reno <renodr@…>, 5 years ago

Update to systemd-243. BLFS portion coming whenever utility power is restored here.

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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, apply a patch to fix issues with udev and evdev
44 device node assignment:</para>
45
46<screen><userinput remap="pre">patch -Np1 -i ../systemd-&systemd-version;-udev_fix-1.patch</userinput></screen>
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}.so*; 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 -Dkmod-path=/bin/kmod \
89 -Dldconfig=false \
90 -Dmount-path=/bin/mount \
91 -Drootprefix= \
92 -Drootlibdir=/lib \
93 -Dsplit-usr=true \
94 -Dsulogin-path=/sbin/sulogin \
95 -Dsysusers=false \
96 -Dumount-path=/bin/umount \
97 -Db_lto=false \
98 -Drpmmacrosdir=no \
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 <varlistentry>
178 <term><parameter>-Drpmmacrosdir=no</parameter></term>
179 <listitem>
180 <para>This switch disables installation of RPM Macros
181 for use with systemd because LFS does not support RPM.</para>
182 </listitem>
183 </varlistentry>
184 </variablelist>
185
186 <para>Compile the package:</para>
187
188<screen><userinput remap="make">LANG=en_US.UTF-8 ninja</userinput></screen>
189<!--
190 <para>To test the package, execute the following command:</para>
191
192<screen><userinput remap="test">LANG=en_US.UTF-8 ninja test</userinput></screen>
193-->
194 <para>Install the package:</para>
195
196<screen><userinput remap="install">LANG=en_US.UTF-8 ninja install</userinput></screen>
197
198 <para>Remove an unnecessary symbolic link:</para>
199
200<screen><userinput remap="install">rm -f /usr/bin/xsltproc</userinput></screen>
201
202 <para>Create the <filename>/etc/machine-id</filename> file needed by
203 <command>systemd-journald</command>:</para>
204
205<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
206
207 <para>Setup the basic target structure:</para>
208
209<screen><userinput remap="adjust">systemctl preset-all</userinput></screen>
210
211 <para>Remove symbolic links to Util-Linux libraries:</para>
212
213<screen><userinput remap="adjust">rm -fv /usr/lib/lib{blkid,uuid,mount}.so*</userinput></screen>
214
215 <para>Prevent systemd from creating <filename>/run/nologin</filename>
216 to allow unprivileged user logins without
217 <application>systemd-logind</application>:</para>
218
219<screen><userinput remap="adjust">rm -f /usr/lib/tmpfiles.d/systemd-nologin.conf</userinput></screen>
220
221 </sect2>
222
223 <sect2 id="contents-systemd" role="content">
224 <title>Contents of systemd</title>
225
226 <segmentedlist>
227 <segtitle>Installed programs</segtitle>
228 <segtitle>Installed libraries</segtitle>
229 <segtitle>Installed directories</segtitle>
230
231 <seglistitem>
232 <seg>bootctl, busctl, coredumpctl, halt (symlink to systemctl),
233 hostnamectl, init, journalctl, kernel-install, localectl, loginctl,
234 machinectl, networkctl, portablectl, poweroff (symlink to
235 systemctl), reboot (symlink to systemctl), resolvconf (symlink to
236 resolvectl), resolvectl, runlevel (symlink to systemctl), shutdown
237 (symlink to systemctl), systemctl, systemd-analyze,
238 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
239 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
240 systemd-id128, systemd-inhibit, systemd-machine-id-setup,
241 systemd-mount, systemd-notify, systemd-nspawn, systemd-path,
242 systemd-resolve (symlink to resolvectl), systemd-run,
243 systemd-socket-activate, systemd-stdio-bridge, systemd-tmpfiles,
244 systemd-tty-ask-password-agent, systemd-umount (symlink to
245 systemd-mount), telinit (symlink to systemctl), timedatectl, and
246 udevadm</seg>
247 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
248 libnss_resolve.so.2, libnss_systemd.so.2,
249 libsystemd.so, libsystemd-shared-&systemd-version;.so (in /lib/systemd),
250 and libudev.so</seg>
251 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
252 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
253 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
254 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
255 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
256 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
257 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
258 </seglistitem>
259 </segmentedlist>
260
261 <variablelist>
262 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
263 <?dbfo list-presentation="list"?>
264 <?dbhtml list-presentation="table"?>
265
266 <varlistentry id="bootctl">
267 <term><command>bootctl</command></term>
268 <listitem>
269 <para>Used to query the firmware and boot manager settings</para>
270 <indexterm zone="ch-system-systemd bootctl">
271 <primary sortas="b-bootctl">bootctl</primary>
272 </indexterm>
273 </listitem>
274 </varlistentry>
275
276 <varlistentry id="busctl">
277 <term><command>busctl</command></term>
278 <listitem>
279 <para>Used to introspect and monitor the D-Bus bus</para>
280 <indexterm zone="ch-system-systemd busctl">
281 <primary sortas="b-busctl">busctl</primary>
282 </indexterm>
283 </listitem>
284 </varlistentry>
285
286 <varlistentry id="coredumpctl">
287 <term><command>coredumpctl</command></term>
288 <listitem>
289 <para>Used to retrieve coredumps from the systemd journal</para>
290 <indexterm zone="ch-system-systemd coredumpctl">
291 <primary sortas="b-coredumpctl">coredumpctl</primary>
292 </indexterm>
293 </listitem>
294 </varlistentry>
295
296 <varlistentry id="halt">
297 <term><command>halt</command></term>
298 <listitem>
299 <para>Normally invokes <command>shutdown</command> with the
300 <parameter>-h</parameter> option, except when already in run-level 0,
301 then it tells the kernel to halt the system; it notes in the
302 file <filename>/var/log/wtmp</filename> that the system is being
303 brought down</para>
304 <indexterm zone="ch-system-systemd halt">
305 <primary sortas="b-halt">halt</primary>
306 </indexterm>
307 </listitem>
308 </varlistentry>
309
310 <varlistentry id="hostnamectl">
311 <term><command>hostnamectl</command></term>
312 <listitem>
313 <para>Used to query and change the system hostname and related
314 settings</para>
315 <indexterm zone="ch-system-systemd hostnamectl">
316 <primary sortas="b-hostnamectl">hostnamectl</primary>
317 </indexterm>
318 </listitem>
319 </varlistentry>
320
321 <varlistentry id="init">
322 <term><command>init</command></term>
323 <listitem>
324 <para>The first process to be started when the kernel has initialized
325 the hardware which takes over the boot process and starts all
326 processes according to its configuration files</para>
327 <indexterm zone="ch-system-systemd init">
328 <primary sortas="b-init">init</primary>
329 </indexterm>
330 </listitem>
331 </varlistentry>
332
333 <varlistentry id="journalctl">
334 <term><command>journalctl</command></term>
335 <listitem>
336 <para>Used to query the contents of the systemd journal</para>
337 <indexterm zone="ch-system-systemd journalctl">
338 <primary sortas="b-journalctl">journalctl</primary>
339 </indexterm>
340 </listitem>
341 </varlistentry>
342
343 <varlistentry id="kernel-install">
344 <term><command>kernel-install</command></term>
345 <listitem>
346 <para>Used to add and remove kernel and initramfs images to and
347 from /boot</para>
348 <indexterm zone="ch-system-systemd kernel-install">
349 <primary sortas="b-kernel-install">kernel-install</primary>
350 </indexterm>
351 </listitem>
352 </varlistentry>
353
354 <varlistentry id="localectl">
355 <term><command>localectl</command></term>
356 <listitem>
357 <para>Used to query and change the system locale and keyboard layout
358 settings</para>
359 <indexterm zone="ch-system-systemd localectl">
360 <primary sortas="b-localectl">localectl</primary>
361 </indexterm>
362 </listitem>
363 </varlistentry>
364
365 <varlistentry id="loginctl">
366 <term><command>loginctl</command></term>
367 <listitem>
368 <para>Used to introspect and control the state of the systemd Login
369 Manager</para>
370 <indexterm zone="ch-system-systemd loginctl">
371 <primary sortas="b-loginctl">loginctl</primary>
372 </indexterm>
373 </listitem>
374 </varlistentry>
375
376 <varlistentry id="machinectl">
377 <term><command>machinectl</command></term>
378 <listitem>
379 <para>Used to introspect and control the state of the systemd Virtual
380 Machine and Container Registration Manager</para>
381 <indexterm zone="ch-system-systemd machinectl">
382 <primary sortas="b-machinectl">machinectl</primary>
383 </indexterm>
384 </listitem>
385 </varlistentry>
386
387 <varlistentry id="networkctl">
388 <term><command>networkctl</command></term>
389 <listitem>
390 <para>Used to introspect the state of the network links as seen by
391 systemd-networkd</para>
392 <indexterm zone="ch-system-systemd networkctl">
393 <primary sortas="b-networkctl">networkctl</primary>
394 </indexterm>
395 </listitem>
396 </varlistentry>
397
398 <varlistentry id="portablectl">
399 <term><command>portablectl</command></term>
400 <listitem>
401 <para>Used to attach or detach portable services from the local
402 system</para>
403 <indexterm zone="ch-system-systemd portablectl">
404 <primary sortas="b-portablectl">portablectl</primary>
405 </indexterm>
406 </listitem>
407 </varlistentry>
408
409 <varlistentry id="poweroff">
410 <term><command>poweroff</command></term>
411 <listitem>
412 <para>Tells the kernel to halt the system and switch off the computer
413 (see <command>halt</command>)</para>
414 <indexterm zone="ch-system-systemd poweroff">
415 <primary sortas="b-poweroff">poweroff</primary>
416 </indexterm>
417 </listitem>
418 </varlistentry>
419
420 <varlistentry id="reboot">
421 <term><command>reboot</command></term>
422 <listitem>
423 <para>Tells the kernel to reboot the system (see
424 <command>halt</command>)</para>
425 <indexterm zone="ch-system-systemd reboot">
426 <primary sortas="b-reboot">reboot</primary>
427 </indexterm>
428 </listitem>
429 </varlistentry>
430
431 <varlistentry id="resolvconf">
432 <term><command>resolvconf</command></term>
433 <listitem>
434 <para>Register DNS server and domain configuration with
435 <command>systemd-resolved</command></para>
436 <indexterm zone="ch-system-systemd resolvconf">
437 <primary sortas="b-resolvconf">resolvconf</primary>
438 </indexterm>
439 </listitem>
440 </varlistentry>
441
442 <varlistentry id="resolvectl">
443 <term><command>resolvectl</command></term>
444 <listitem>
445 <para>Send control commands to the network name resolution
446 manager, or resolve domain names, IPv4 and IPv6 addresses,
447 DNS records, and services.</para>
448 <indexterm zone="ch-system-systemd resolvectl">
449 <primary sortas="b-resolvectl">resolvectl</primary>
450 </indexterm>
451 </listitem>
452 </varlistentry>
453
454 <varlistentry id="runlevel">
455 <term><command>runlevel</command></term>
456 <listitem>
457 <para>Reports the previous and the current run-level, as noted in the
458 last run-level record in <filename>/var/run/utmp</filename></para>
459 <indexterm zone="ch-system-systemd runlevel">
460 <primary sortas="b-runlevel">runlevel</primary>
461 </indexterm>
462 </listitem>
463 </varlistentry>
464
465 <varlistentry id="shutdown">
466 <term><command>shutdown</command></term>
467 <listitem>
468 <para>Brings the system down in a secure way, signaling all processes
469 and notifying all logged-in users</para>
470 <indexterm zone="ch-system-systemd shutdown">
471 <primary sortas="b-shutdown">shutdown</primary>
472 </indexterm>
473 </listitem>
474 </varlistentry>
475
476 <varlistentry id="systemctl">
477 <term><command>systemctl</command></term>
478 <listitem>
479 <para>Used to introspect and control the state of the systemd system
480 and service manager</para>
481 <indexterm zone="ch-system-systemd systemctl">
482 <primary sortas="b-systemctl">systemctl</primary>
483 </indexterm>
484 </listitem>
485 </varlistentry>
486
487 <varlistentry id="systemd-analyze">
488 <term><command>systemd-analyze</command></term>
489 <listitem>
490 <para>Used to determine system boot-up performance of the current
491 boot</para>
492 <indexterm zone="ch-system-systemd systemd-analyze">
493 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
494 </indexterm>
495 </listitem>
496 </varlistentry>
497
498 <varlistentry id="systemd-ask-password">
499 <term><command>systemd-ask-password</command></term>
500 <listitem>
501 <para>Used to query a system password or passphrase from the user,
502 using a question message specified on the command line</para>
503 <indexterm zone="ch-system-systemd systemd-ask-password">
504 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
505 </indexterm>
506 </listitem>
507 </varlistentry>
508
509 <varlistentry id="systemd-cat">
510 <term><command>systemd-cat</command></term>
511 <listitem>
512 <para>Used to connect STDOUT and STDERR of a process with the Journal
513 </para>
514 <indexterm zone="ch-system-systemd systemd-cat">
515 <primary sortas="b-systemd-cat">systemd-cat</primary>
516 </indexterm>
517 </listitem>
518 </varlistentry>
519
520 <varlistentry id="systemd-cgls">
521 <term><command>systemd-cgls</command></term>
522 <listitem>
523 <para>Recursively shows the contents of the selected Linux control
524 group hierarchy in a tree</para>
525 <indexterm zone="ch-system-systemd systemd-cgls">
526 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
527 </indexterm>
528 </listitem>
529 </varlistentry>
530
531 <varlistentry id="systemd-cgtop">
532 <term><command>systemd-cgtop</command></term>
533 <listitem>
534 <para>Shows the top control groups of the local Linux control group
535 hierarchy, ordered by their CPU, memory and disk I/O load</para>
536 <indexterm zone="ch-system-systemd systemd-cgtop">
537 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
538 </indexterm>
539 </listitem>
540 </varlistentry>
541
542 <varlistentry id="systemd-delta">
543 <term><command>systemd-delta</command></term>
544 <listitem>
545 <para>Used to identify and compare configuration files in
546 <filename class="directory">/etc</filename> that override default
547 counterparts in <filename class="directory">/usr</filename></para>
548 <indexterm zone="ch-system-systemd systemd-delta">
549 <primary sortas="b-systemd-delta">systemd-delta</primary>
550 </indexterm>
551 </listitem>
552 </varlistentry>
553
554 <varlistentry id="systemd-detect-virt">
555 <term><command>systemd-detect-virt</command></term>
556 <listitem>
557 <para>Detects execution in a virtualized environment</para>
558 <indexterm zone="ch-system-systemd systemd-detect-virt">
559 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
560 </indexterm>
561 </listitem>
562 </varlistentry>
563
564 <varlistentry id="systemd-escape">
565 <term><command>systemd-escape</command></term>
566 <listitem>
567 <para>Used to escape strings for inclusion in systemd unit
568 names</para>
569 <indexterm zone="ch-system-systemd systemd-escape">
570 <primary sortas="b-systemd-escape">systemd-escape</primary>
571 </indexterm>
572 </listitem>
573 </varlistentry>
574
575 <varlistentry id="systemd-hwdb">
576 <term><command>systemd-hwdb</command></term>
577 <listitem>
578 <para>Used to manage hardware database (hwdb)</para>
579 <indexterm zone="ch-system-systemd systemd-hwdb">
580 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
581 </indexterm>
582 </listitem>
583 </varlistentry>
584
585 <varlistentry id="systemd-id128">
586 <term><command>systemd-id128</command></term>
587 <listitem>
588 <para>Generate and print id128 strings</para>
589 <indexterm zone="ch-system-systemd systemd-id128">
590 <primary sortas="b-systemd-id128">systemd-id128</primary>
591 </indexterm>
592 </listitem>
593 </varlistentry>
594
595 <varlistentry id="systemd-inhibit">
596 <term><command>systemd-inhibit</command></term>
597 <listitem>
598 <para>Used to execute a program with a shutdown, sleep or idle
599 inhibitor lock taken</para>
600 <indexterm zone="ch-system-systemd systemd-inhibit">
601 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
602 </indexterm>
603 </listitem>
604 </varlistentry>
605
606 <varlistentry id="systemd-machine-id-setup">
607 <term><command>systemd-machine-id-setup</command></term>
608 <listitem>
609 <para>Used by system installer tools to initialize the machine ID
610 stored in <filename>/etc/machine-id</filename> at install time with a
611 randomly generated ID</para>
612 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
613 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
614 </indexterm>
615 </listitem>
616 </varlistentry>
617
618 <varlistentry id="systemd-mount">
619 <term><command>systemd-mount</command></term>
620 <listitem>
621 <para>A tool to temporarily mount or auto-mount a drive.</para>
622 <indexterm zone="ch-system-systemd systemd-mount">
623 <primary sortas="b-systemd-mount">systemd-mount</primary>
624 </indexterm>
625 </listitem>
626 </varlistentry>
627
628 <varlistentry id="systemd-notify">
629 <term><command>systemd-notify</command></term>
630 <listitem>
631 <para>Used by daemon scripts to notify the init system about status
632 changes</para>
633 <indexterm zone="ch-system-systemd systemd-notify">
634 <primary sortas="b-systemd-notify">systemd-notify</primary>
635 </indexterm>
636 </listitem>
637 </varlistentry>
638
639 <varlistentry id="systemd-nspawn">
640 <term><command>systemd-nspawn</command></term>
641 <listitem>
642 <para>Used to run a command or OS in a light-weight namespace
643 container</para>
644 <indexterm zone="ch-system-systemd systemd-nspawn">
645 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
646 </indexterm>
647 </listitem>
648 </varlistentry>
649
650 <varlistentry id="systemd-path">
651 <term><command>systemd-path</command></term>
652 <listitem>
653 <para>Used to query system and user paths</para>
654 <indexterm zone="ch-system-systemd systemd-path">
655 <primary sortas="b-systemd-path">systemd-path</primary>
656 </indexterm>
657 </listitem>
658 </varlistentry>
659
660 <varlistentry id="systemd-resolve">
661 <term><command>systemd-resolve</command></term>
662 <listitem>
663 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
664 resource records, and services</para>
665 <indexterm zone="ch-system-systemd systemd-resolve">
666 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
667 </indexterm>
668 </listitem>
669 </varlistentry>
670
671 <varlistentry id="systemd-run">
672 <term><command>systemd-run</command></term>
673 <listitem>
674 <para>Used to create and start a transient .service or a .scope unit
675 and run the specified command in it</para>
676 <indexterm zone="ch-system-systemd systemd-run">
677 <primary sortas="b-systemd-run">systemd-run</primary>
678 </indexterm>
679 </listitem>
680 </varlistentry>
681
682 <!-- <varlistentry id="systemd-stdio-bridge">
683 <term><command>systemd-stdio-bridge</command></term>
684 <listitem>
685 <para>To be completed</para>
686 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
687 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
688 </indexterm>
689 </listitem>
690 </varlistentry> -->
691
692 <varlistentry id="systemd-socket-activate">
693 <term><command>systemd-socket-activate</command></term>
694 <listitem>
695 <para>A tool to listen on socket devices and launch a process upon
696 connection.</para>
697 <indexterm zone="ch-system-systemd systemd-socket-activate">
698 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
699 </indexterm>
700 </listitem>
701 </varlistentry>
702
703 <varlistentry id="systemd-tmpfiles">
704 <term><command>systemd-tmpfiles</command></term>
705 <listitem>
706 <para>Creates, deletes and cleans up volatile and temporary files and
707 directories, based on the configuration file format and location
708 specified in
709 <filename class="directory">tmpfiles.d</filename> directories</para>
710 <indexterm zone="ch-system-systemd systemd-tmpfiles">
711 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
712 </indexterm>
713 </listitem>
714 </varlistentry>
715
716 <varlistentry id="systemd-umount">
717 <term><command>systemd-umount</command></term>
718 <listitem>
719 <para>Unmount mount points</para>
720 <indexterm zone="ch-system-systemd systemd-umount">
721 <primary sortas="b-systemd-umount">systemd-umount</primary>
722 </indexterm>
723 </listitem>
724 </varlistentry>
725
726 <varlistentry id="systemd-tty-ask-password-agent">
727 <term><command>systemd-tty-ask-password-agent</command></term>
728 <listitem>
729 <para>Used to list or process pending systemd password requests</para>
730 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
731 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
732 </indexterm>
733 </listitem>
734 </varlistentry>
735
736 <varlistentry id="telinit">
737 <term><command>telinit</command></term>
738 <listitem>
739 <para>Tells <command>init</command> which run-level to change
740 to</para>
741 <indexterm zone="ch-system-systemd telinit">
742 <primary sortas="b-telinit">telinit</primary>
743 </indexterm>
744 </listitem>
745 </varlistentry>
746
747 <varlistentry id="timedatectl">
748 <term><command>timedatectl</command></term>
749 <listitem>
750 <para>Used to query and change the system clock and its settings
751 </para>
752 <indexterm zone="ch-system-systemd timedatectl">
753 <primary sortas="b-timedatectl">timedatectl</primary>
754 </indexterm>
755 </listitem>
756 </varlistentry>
757
758 <varlistentry id="udevadm">
759 <term><command>udevadm</command></term>
760 <listitem>
761 <para>Generic udev administration tool: controls the udevd daemon,
762 provides info from the Udev database, monitors uevents, waits for
763 uevents to finish, tests udev configuration, and triggers uevents
764 for a given device</para>
765 <indexterm zone="ch-system-systemd udevadm">
766 <primary sortas="b-udevadm">udevadm</primary>
767 </indexterm>
768 </listitem>
769 </varlistentry>
770
771 <varlistentry id="libsystemd">
772 <term><filename class="libraryfile">libsystemd</filename></term>
773 <listitem>
774 <para>The main systemd utility library</para>
775 <indexterm zone="ch-system-systemd libsystemd">
776 <primary sortas="c-libsystemd">libsystemd</primary>
777 </indexterm>
778 </listitem>
779 </varlistentry>
780
781 <varlistentry id="libudev">
782 <term><filename class="libraryfile">libudev</filename></term>
783 <listitem>
784 <para>A library to access Udev device information</para>
785 <indexterm zone="ch-system-systemd libudev">
786 <primary sortas="c-libudev">libudev</primary>
787 </indexterm>
788 </listitem>
789 </varlistentry>
790
791 </variablelist>
792
793 </sect2>
794
795</sect1>
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