source: chapter06/systemd.xml@ 4a7709f

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Last change on this file since 4a7709f was 4a7709f, checked in by Bruce Dubbs <bdubbs@…>, 5 years ago

Minor rewording

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