source: chapter08/systemd.xml@ 6dff9ef

11.3 11.3-rc1 12.0 12.0-rc1 12.1 12.1-rc1 12.2 12.2-rc1 bdubbs/gcc13 multilib renodr/libudev-from-systemd trunk xry111/arm64 xry111/arm64-12.0 xry111/clfs-ng xry111/loongarch xry111/loongarch-12.0 xry111/loongarch-12.1 xry111/loongarch-12.2 xry111/mips64el xry111/multilib xry111/pip3 xry111/update-glibc
Last change on this file since 6dff9ef was 172185a9, checked in by Douglas R. Reno <renodr@…>, 2 years ago

Update to systemd-252.

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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-fin-sbu;</seg>
35 <seg>&systemd-fin-du;</seg>
36 </seglistitem>
37 </segmentedlist>
38 </sect2>
39
40 <sect2 role="installation">
41 <title>Installation of systemd</title>
42
43<!--
44 <para>First, fix an issue introduced by glibc-2.36.</para>
45
46<screen><userinput remap="pre">patch -Np1 -i ../&systemd-upstream-patch;</userinput></screen>
47-->
48
49 <para>Remove two unneeded groups,
50 <systemitem class="groupname">render</systemitem> and
51 <systemitem class="groupname">sgx</systemitem>, from the default udev
52 rules:</para>
53
54 <screen><userinput remap="pre">sed -i -e 's/GROUP="render"/GROUP="video"/' \
55 -e 's/GROUP="sgx", //' rules.d/50-udev-default.rules.in</userinput></screen>
56
57 <para>Prepare systemd for compilation:</para>
58
59<screen><userinput remap="configure">mkdir -p build
60cd build
61
62meson --prefix=/usr \
63 --buildtype=release \
64 -Ddefault-dnssec=no \
65 -Dfirstboot=false \
66 -Dinstall-tests=false \
67 -Dldconfig=false \
68 -Dsysusers=false \
69 -Drpmmacrosdir=no \
70 -Dhomed=false \
71 -Duserdb=false \
72 -Dman=false \
73 -Dmode=release \
74 -Dpamconfdir=no \
75 -Ddocdir=/usr/share/doc/systemd-&systemd-version; \
76 ..</userinput></screen>
77
78 <variablelist>
79 <title>The meaning of the meson options:</title>
80
81 <varlistentry>
82 <term><parameter>--buildtype=release</parameter></term>
83 <listitem>
84 <para>This switch overrides the default buildtype
85 (<quote>debug</quote>), which would produce unoptimized
86 binaries.</para>
87 </listitem>
88 </varlistentry>
89
90 <varlistentry>
91 <term><parameter>-Ddefault-dnssec=no</parameter></term>
92 <listitem>
93 <para>This switch turns off the experimental DNSSEC support.</para>
94 </listitem>
95 </varlistentry>
96
97 <varlistentry>
98 <term><parameter>-Dfirstboot=false</parameter></term>
99 <listitem>
100 <para>This switch prevents installation of systemd
101 services responsible for setting up the system for
102 the first time. They are not useful for LFS because
103 everything is done manually.</para>
104 </listitem>
105 </varlistentry>
106
107 <varlistentry>
108 <term><parameter>-Dinstall-tests=false</parameter></term>
109 <listitem>
110 <para>This switch prevents installation of the compiled tests.</para>
111 </listitem>
112 </varlistentry>
113
114 <varlistentry>
115 <term><parameter>-Dldconfig=false</parameter></term>
116 <listitem>
117 <para>This switch prevents installation of a systemd unit that runs
118 <command>ldconfig</command> at boot, which is not useful for source
119 distributions such as LFS and makes the boot time longer. Remove it
120 if the described feature is desired.</para>
121 </listitem>
122 </varlistentry>
123
124 <varlistentry>
125 <term><parameter>-Dsysusers=false</parameter></term>
126 <listitem>
127 <para>This switch prevents installation of systemd
128 services responsible for setting up the
129 <filename>/etc/group</filename> and
130 <filename>/etc/passwd</filename> files. Both files
131 were created in the previous chapter. This daemon is not useful
132 on an LFS system since user accounts are manually created.</para>
133 </listitem>
134 </varlistentry>
135
136 <varlistentry>
137 <term><parameter>-Drpmmacrosdir=no</parameter></term>
138 <listitem>
139 <para>This switch disables installation of RPM Macros
140 for use with systemd because LFS does not support RPM.</para>
141 </listitem>
142 </varlistentry>
143
144 <varlistentry>
145 <term><parameter>-D{userdb,homed}=false</parameter></term>
146 <listitem>
147 <para>Remove two daemons that have dependencies that do not fit
148 the scope of LFS.</para>
149 </listitem>
150 </varlistentry>
151
152 <varlistentry>
153 <term><parameter>-Dman=false</parameter></term>
154 <listitem>
155 <para>Prevent the generation of man pages to avoid extra
156 dependencies. We will install pre-generated man pages for systemd
157 from a tarball later.</para>
158 </listitem>
159 </varlistentry>
160
161 <varlistentry>
162 <term><parameter>-Dmode=release</parameter></term>
163 <listitem>
164 <para>Disable some features considered experimental by upstream.
165 </para>
166 </listitem>
167 </varlistentry>
168
169 <varlistentry>
170 <term><parameter>-Dpamconfdir=no</parameter></term>
171 <listitem>
172 <para>Prevent the installation of a PAM configuration file not
173 functional on LFS.</para>
174 </listitem>
175 </varlistentry>
176 </variablelist>
177
178 <para>Compile the package:</para>
179
180<screen><userinput remap="make">ninja</userinput></screen>
181
182 <para>Install the package:</para>
183
184<screen><userinput remap="install">ninja install</userinput></screen>
185
186 <para>Install the man pages:</para>
187
188 <!-- Please make sure systemd man pages tarball has a common leading
189 component in the path. -->
190<screen><userinput remap="install">tar -xf ../../systemd-man-pages-&systemd-man-version;.tar.xz --strip-components=1 -C /usr/share/man</userinput></screen>
191
192 <para>Create the <filename>/etc/machine-id</filename> file needed by
193 <command>systemd-journald</command>:</para>
194
195<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
196
197 <para>Setup the basic target structure:</para>
198
199<screen><userinput remap="adjust">systemctl preset-all</userinput></screen>
200
201 <para>Disable a service for upgrading binary distros. It's useless for
202 a basic Linux system built from source, and it will report an error if
203 it's enabled but not configured:</para>
204
205<screen><userinput remap="adjust">systemctl disable systemd-sysupdate</userinput></screen>
206
207 <para>Also disable that unit's timer:</para>
208
209<screen><userinput remap="adjust">systemd disable systemd-sysupdate-reboot.timer</userinput></screen>
210
211<!-- dev: 50-pid-max.conf is not removed in BLFS, so I commented the following out.
212 If it causes any trouble, we can add this back and also copy it into BLFS -->
213<!--
214 <para>Prevent systemd from resetting the maximum PID value which causes
215 some problems with packages and units in BLFS:</para>
216
217<screen><userinput remap="adjust">rm -f /usr/lib/sysctl.d/50-pid-max.conf</userinput></screen>
218-->
219
220 </sect2>
221
222 <sect2 id="contents-systemd" role="content">
223 <title>Contents of systemd</title>
224
225 <segmentedlist>
226 <segtitle>Installed programs</segtitle>
227 <segtitle>Installed libraries</segtitle>
228 <segtitle>Installed directories</segtitle>
229
230 <seglistitem>
231 <seg>busctl, coredumpctl, halt (symlink to systemctl),
232 hostnamectl, init, journalctl, kernel-install, localectl, loginctl,
233 machinectl, networkctl, oomctl, portablectl, poweroff (symlink to
234 systemctl), reboot (symlink to systemctl), resolvconf (symlink to
235 resolvectl), resolvectl, runlevel (symlink to systemctl), shutdown
236 (symlink to systemctl), systemctl, systemd-analyze,
237 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
238 systemd-creds, systemd-delta, systemd-detect-virt,
239 systemd-dissect, systemd-escape, systemd-hwdb, systemd-id128,
240 systemd-inhibit, systemd-machine-id-setup,
241 systemd-mount, systemd-notify, systemd-nspawn, systemd-path,
242 systemd-repart, systemd-resolve (symlink to resolvectl), systemd-run,
243 systemd-socket-activate, systemd-stdio-bridge, systemd-sysext,
244 systemd-tmpfiles, systemd-tty-ask-password-agent,
245 systemd-umount (symlink to systemd-mount),
246 telinit (symlink to systemctl), timedatectl, and 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 /usr/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, /usr/lib/systemd, /usr/lib/udev, /usr/include/systemd,
254 /usr/lib/binfmt.d, /usr/lib/environment.d, /usr/lib/kernel,
255 /usr/lib/modules-load.d, /usr/lib/sysctl.d, /usr/lib/systemd,
256 /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="busctl">
268 <term><command>busctl</command></term>
269 <listitem>
270 <para>Is used to introspect and monitor the D-Bus bus</para>
271 <indexterm zone="ch-system-systemd busctl">
272 <primary sortas="b-busctl">busctl</primary>
273 </indexterm>
274 </listitem>
275 </varlistentry>
276
277 <varlistentry id="coredumpctl">
278 <term><command>coredumpctl</command></term>
279 <listitem>
280 <para>Is used to retrieve coredumps from the systemd journal</para>
281 <indexterm zone="ch-system-systemd coredumpctl">
282 <primary sortas="b-coredumpctl">coredumpctl</primary>
283 </indexterm>
284 </listitem>
285 </varlistentry>
286
287 <varlistentry id="halt">
288 <term><command>halt</command></term>
289 <listitem>
290 <para>Normally invokes <command>shutdown</command> with the
291 <parameter>-h</parameter> option, except when already in run-level 0,
292 then it tells the kernel to halt the system; it notes in the
293 file <filename>/var/log/wtmp</filename> that the system is being
294 brought down</para>
295 <indexterm zone="ch-system-systemd halt">
296 <primary sortas="b-halt">halt</primary>
297 </indexterm>
298 </listitem>
299 </varlistentry>
300
301 <varlistentry id="hostnamectl">
302 <term><command>hostnamectl</command></term>
303 <listitem>
304 <para>Is used to query and change the system hostname and related
305 settings</para>
306 <indexterm zone="ch-system-systemd hostnamectl">
307 <primary sortas="b-hostnamectl">hostnamectl</primary>
308 </indexterm>
309 </listitem>
310 </varlistentry>
311
312 <varlistentry id="init">
313 <term><command>init</command></term>
314 <listitem>
315 <para>Is the first process to be started when the kernel has initialized
316 the hardware which takes over the boot process and starts all
317 processes according to its configuration files. In this case, it starts
318 systemd</para>
319 <indexterm zone="ch-system-systemd init">
320 <primary sortas="b-init">init</primary>
321 </indexterm>
322 </listitem>
323 </varlistentry>
324
325 <varlistentry id="journalctl">
326 <term><command>journalctl</command></term>
327 <listitem>
328 <para>Is used to query the contents of the systemd journal</para>
329 <indexterm zone="ch-system-systemd journalctl">
330 <primary sortas="b-journalctl">journalctl</primary>
331 </indexterm>
332 </listitem>
333 </varlistentry>
334
335 <varlistentry id="kernel-install">
336 <term><command>kernel-install</command></term>
337 <listitem>
338 <para>Is used to add and remove kernel and initramfs images to and
339 from /boot. In LFS, this is done manually</para>
340 <indexterm zone="ch-system-systemd kernel-install">
341 <primary sortas="b-kernel-install">kernel-install</primary>
342 </indexterm>
343 </listitem>
344 </varlistentry>
345
346 <varlistentry id="localectl">
347 <term><command>localectl</command></term>
348 <listitem>
349 <para>Is used to query and change the system locale and keyboard layout
350 settings</para>
351 <indexterm zone="ch-system-systemd localectl">
352 <primary sortas="b-localectl">localectl</primary>
353 </indexterm>
354 </listitem>
355 </varlistentry>
356
357 <varlistentry id="loginctl">
358 <term><command>loginctl</command></term>
359 <listitem>
360 <para>Is used to introspect and control the state of the systemd Login
361 Manager</para>
362 <indexterm zone="ch-system-systemd loginctl">
363 <primary sortas="b-loginctl">loginctl</primary>
364 </indexterm>
365 </listitem>
366 </varlistentry>
367
368 <varlistentry id="machinectl">
369 <term><command>machinectl</command></term>
370 <listitem>
371 <para>Is used to introspect and control the state of the systemd Virtual
372 Machine and Container Registration Manager</para>
373 <indexterm zone="ch-system-systemd machinectl">
374 <primary sortas="b-machinectl">machinectl</primary>
375 </indexterm>
376 </listitem>
377 </varlistentry>
378
379 <varlistentry id="networkctl">
380 <term><command>networkctl</command></term>
381 <listitem>
382 <para>Is used to introspect and configure the state of the network
383 links configured by systemd-networkd</para>
384 <indexterm zone="ch-system-systemd networkctl">
385 <primary sortas="b-networkctl">networkctl</primary>
386 </indexterm>
387 </listitem>
388 </varlistentry>
389
390 <varlistentry id="oomctl">
391 <term><command>oomctl</command></term>
392 <listitem>
393 <para>Controls the systemd Out Of Memory daemon</para>
394 <indexterm zone="ch-system-systemd oomctl">
395 <primary sortas="b-oomctl">oomctl</primary>
396 </indexterm>
397 </listitem>
398 </varlistentry>
399
400 <varlistentry id="portablectl">
401 <term><command>portablectl</command></term>
402 <listitem>
403 <para>Is used to attach or detach portable services from the local
404 system</para>
405 <indexterm zone="ch-system-systemd portablectl">
406 <primary sortas="b-portablectl">portablectl</primary>
407 </indexterm>
408 </listitem>
409 </varlistentry>
410
411 <varlistentry id="poweroff">
412 <term><command>poweroff</command></term>
413 <listitem>
414 <para>Instructs the kernel to halt the system and switch off the computer
415 (see <command>halt</command>)</para>
416 <indexterm zone="ch-system-systemd poweroff">
417 <primary sortas="b-poweroff">poweroff</primary>
418 </indexterm>
419 </listitem>
420 </varlistentry>
421
422 <varlistentry id="reboot">
423 <term><command>reboot</command></term>
424 <listitem>
425 <para>Instructs the kernel to reboot the system (see
426 <command>halt</command>)</para>
427 <indexterm zone="ch-system-systemd reboot">
428 <primary sortas="b-reboot">reboot</primary>
429 </indexterm>
430 </listitem>
431 </varlistentry>
432
433 <varlistentry id="resolvconf">
434 <term><command>resolvconf</command></term>
435 <listitem>
436 <para>Registers DNS server and domain configuration with
437 <command>systemd-resolved</command></para>
438 <indexterm zone="ch-system-systemd resolvconf">
439 <primary sortas="b-resolvconf">resolvconf</primary>
440 </indexterm>
441 </listitem>
442 </varlistentry>
443
444 <varlistentry id="resolvectl">
445 <term><command>resolvectl</command></term>
446 <listitem>
447 <para>Sends control commands to the network name resolution
448 manager, or resolves domain names, IPv4 and IPv6 addresses,
449 DNS records, and services</para>
450 <indexterm zone="ch-system-systemd resolvectl">
451 <primary sortas="b-resolvectl">resolvectl</primary>
452 </indexterm>
453 </listitem>
454 </varlistentry>
455
456 <varlistentry id="runlevel">
457 <term><command>runlevel</command></term>
458 <listitem>
459 <para>Outputs the previous and the current run-level, as noted in the
460 last run-level record in <filename>/run/utmp</filename></para>
461 <indexterm zone="ch-system-systemd runlevel">
462 <primary sortas="b-runlevel">runlevel</primary>
463 </indexterm>
464 </listitem>
465 </varlistentry>
466
467 <varlistentry id="shutdown">
468 <term><command>shutdown</command></term>
469 <listitem>
470 <para>Brings the system down in a safe and secure manner, signaling
471 all processes and notifying all logged-in users</para>
472 <indexterm zone="ch-system-systemd shutdown">
473 <primary sortas="b-shutdown">shutdown</primary>
474 </indexterm>
475 </listitem>
476 </varlistentry>
477
478 <varlistentry id="systemctl">
479 <term><command>systemctl</command></term>
480 <listitem>
481 <para>Is used to introspect and control the state of the systemd system
482 and service manager</para>
483 <indexterm zone="ch-system-systemd systemctl">
484 <primary sortas="b-systemctl">systemctl</primary>
485 </indexterm>
486 </listitem>
487 </varlistentry>
488
489 <varlistentry id="systemd-analyze">
490 <term><command>systemd-analyze</command></term>
491 <listitem>
492 <para>Is used to determine system startup performance of the current
493 boot, as well as identify troublesome systemd units</para>
494 <indexterm zone="ch-system-systemd systemd-analyze">
495 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
496 </indexterm>
497 </listitem>
498 </varlistentry>
499
500 <varlistentry id="systemd-ask-password">
501 <term><command>systemd-ask-password</command></term>
502 <listitem>
503 <para>Is used to query a system password or passphrase from the user,
504 using a question message specified on the command line</para>
505 <indexterm zone="ch-system-systemd systemd-ask-password">
506 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
507 </indexterm>
508 </listitem>
509 </varlistentry>
510
511 <varlistentry id="systemd-cat">
512 <term><command>systemd-cat</command></term>
513 <listitem>
514 <para>Is used to connect the STDOUT and STDERR outputs of a process
515 with the systemd journal
516 </para>
517 <indexterm zone="ch-system-systemd systemd-cat">
518 <primary sortas="b-systemd-cat">systemd-cat</primary>
519 </indexterm>
520 </listitem>
521 </varlistentry>
522
523 <varlistentry id="systemd-cgls">
524 <term><command>systemd-cgls</command></term>
525 <listitem>
526 <para>Recursively shows the contents of the selected Linux control
527 group hierarchy in a tree</para>
528 <indexterm zone="ch-system-systemd systemd-cgls">
529 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
530 </indexterm>
531 </listitem>
532 </varlistentry>
533
534 <varlistentry id="systemd-cgtop">
535 <term><command>systemd-cgtop</command></term>
536 <listitem>
537 <para>Shows the top control groups of the local Linux control group
538 hierarchy, ordered by their CPU, memory and disk I/O load</para>
539 <indexterm zone="ch-system-systemd systemd-cgtop">
540 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
541 </indexterm>
542 </listitem>
543 </varlistentry>
544
545 <varlistentry id="systemd-creds">
546 <term><command>systemd-creds</command></term>
547 <listitem>
548 <para>Displays and processes credentials</para>
549 <indexterm zone="ch-system-systemd systemd-creds">
550 <primary sortas="b-systemd-creds">systemd-creds</primary>
551 </indexterm>
552 </listitem>
553 </varlistentry>
554
555 <varlistentry id="systemd-delta">
556 <term><command>systemd-delta</command></term>
557 <listitem>
558 <para>Is used to identify and compare configuration files in
559 <filename class="directory">/etc</filename> that override default
560 counterparts in <filename class="directory">/usr</filename></para>
561 <indexterm zone="ch-system-systemd systemd-delta">
562 <primary sortas="b-systemd-delta">systemd-delta</primary>
563 </indexterm>
564 </listitem>
565 </varlistentry>
566
567 <varlistentry id="systemd-detect-virt">
568 <term><command>systemd-detect-virt</command></term>
569 <listitem>
570 <para>Detects whether the system is being run in a virtual
571 environment, and adjusts udev accordingly</para>
572 <indexterm zone="ch-system-systemd systemd-detect-virt">
573 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
574 </indexterm>
575 </listitem>
576 </varlistentry>
577
578 <varlistentry id="systemd-dissect">
579 <term><command>systemd-dissect</command></term>
580 <listitem>
581 <para>Is used to inspect OS disk images</para>
582 <indexterm zone="ch-system-systemd systemd-dissect">
583 <primary sortas="b-systemd-dissect">systemd-dissect</primary>
584 </indexterm>
585 </listitem>
586 </varlistentry>
587
588 <varlistentry id="systemd-escape">
589 <term><command>systemd-escape</command></term>
590 <listitem>
591 <para>Is used to escape strings for inclusion in systemd unit
592 names</para>
593 <indexterm zone="ch-system-systemd systemd-escape">
594 <primary sortas="b-systemd-escape">systemd-escape</primary>
595 </indexterm>
596 </listitem>
597 </varlistentry>
598
599 <varlistentry id="systemd-hwdb">
600 <term><command>systemd-hwdb</command></term>
601 <listitem>
602 <para>Is used to manage the hardware database (hwdb)</para>
603 <indexterm zone="ch-system-systemd systemd-hwdb">
604 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
605 </indexterm>
606 </listitem>
607 </varlistentry>
608
609 <varlistentry id="systemd-id128">
610 <term><command>systemd-id128</command></term>
611 <listitem>
612 <para>Generates and prints id128 strings</para>
613 <indexterm zone="ch-system-systemd systemd-id128">
614 <primary sortas="b-systemd-id128">systemd-id128</primary>
615 </indexterm>
616 </listitem>
617 </varlistentry>
618
619 <varlistentry id="systemd-inhibit">
620 <term><command>systemd-inhibit</command></term>
621 <listitem>
622 <para>Is used to execute a program with a shutdown, sleep or idle
623 inhibitor lock taken, preventing an action such as a system shutdown
624 until the process is completed</para>
625 <indexterm zone="ch-system-systemd systemd-inhibit">
626 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
627 </indexterm>
628 </listitem>
629 </varlistentry>
630
631 <varlistentry id="systemd-machine-id-setup">
632 <term><command>systemd-machine-id-setup</command></term>
633 <listitem>
634 <para>Is used by system installer tools to initialize the machine ID
635 stored in <filename>/etc/machine-id</filename> at install time with a
636 randomly generated ID</para>
637 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
638 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
639 </indexterm>
640 </listitem>
641 </varlistentry>
642
643 <varlistentry id="systemd-mount">
644 <term><command>systemd-mount</command></term>
645 <listitem>
646 <para>Is used to temporarily mount or automount disks</para>
647 <indexterm zone="ch-system-systemd systemd-mount">
648 <primary sortas="b-systemd-mount">systemd-mount</primary>
649 </indexterm>
650 </listitem>
651 </varlistentry>
652
653 <varlistentry id="systemd-notify">
654 <term><command>systemd-notify</command></term>
655 <listitem>
656 <para>Is used by daemon scripts to notify the init system about status
657 changes</para>
658 <indexterm zone="ch-system-systemd systemd-notify">
659 <primary sortas="b-systemd-notify">systemd-notify</primary>
660 </indexterm>
661 </listitem>
662 </varlistentry>
663
664 <varlistentry id="systemd-nspawn">
665 <term><command>systemd-nspawn</command></term>
666 <listitem>
667 <para>Is used to run a command or OS in a light-weight namespace
668 container</para>
669 <indexterm zone="ch-system-systemd systemd-nspawn">
670 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
671 </indexterm>
672 </listitem>
673 </varlistentry>
674
675 <varlistentry id="systemd-path">
676 <term><command>systemd-path</command></term>
677 <listitem>
678 <para>Is used to query system and user paths</para>
679 <indexterm zone="ch-system-systemd systemd-path">
680 <primary sortas="b-systemd-path">systemd-path</primary>
681 </indexterm>
682 </listitem>
683 </varlistentry>
684
685 <varlistentry id="systemd-repart">
686 <term><command>systemd-repart</command></term>
687 <listitem>
688 <para>Is used to grow and add partitions to a partition table when
689 systemd is used in an OS image (e.g. a container)</para>
690 <indexterm zone="ch-system-systemd systemd-repart">
691 <primary sortas="b-systemd-repart">systemd-repart</primary>
692 </indexterm>
693 </listitem>
694 </varlistentry>
695
696 <varlistentry id="systemd-resolve">
697 <term><command>systemd-resolve</command></term>
698 <listitem>
699 <para>Is used to resolve domain names, IPV4 and IPv6 addresses, DNS
700 resource records, and services</para>
701 <indexterm zone="ch-system-systemd systemd-resolve">
702 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
703 </indexterm>
704 </listitem>
705 </varlistentry>
706
707 <varlistentry id="systemd-run">
708 <term><command>systemd-run</command></term>
709 <listitem>
710 <para>Is used to create and start a transient .service or a .scope
711 unit and run the specified command in it. This is useful for
712 validating systemd units</para>
713 <indexterm zone="ch-system-systemd systemd-run">
714 <primary sortas="b-systemd-run">systemd-run</primary>
715 </indexterm>
716 </listitem>
717 </varlistentry>
718
719 <varlistentry id="systemd-socket-activate">
720 <term><command>systemd-socket-activate</command></term>
721 <listitem>
722 <para>Is used to listen on socket devices and launch a process upon
723 a successful connection to the socket</para>
724 <indexterm zone="ch-system-systemd systemd-socket-activate">
725 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
726 </indexterm>
727 </listitem>
728 </varlistentry>
729
730 <varlistentry id="systemd-sysext">
731 <term><command>systemd-sysext</command></term>
732 <listitem>
733 <para>Activates system extension images</para>
734 <indexterm zone="ch-system-systemd systemd-sysext">
735 <primary sortas="b-systemd-sysext">systemd-sysext</primary>
736 </indexterm>
737 </listitem>
738 </varlistentry>
739
740 <varlistentry id="systemd-tmpfiles">
741 <term><command>systemd-tmpfiles</command></term>
742 <listitem>
743 <para>Creates, deletes and cleans up volatile and temporary files and
744 directories, based on the configuration file format and location
745 specified in
746 <filename class="directory">tmpfiles.d</filename> directories</para>
747 <indexterm zone="ch-system-systemd systemd-tmpfiles">
748 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
749 </indexterm>
750 </listitem>
751 </varlistentry>
752
753 <varlistentry id="systemd-umount">
754 <term><command>systemd-umount</command></term>
755 <listitem>
756 <para>Unmounts mount points</para>
757 <indexterm zone="ch-system-systemd systemd-umount">
758 <primary sortas="b-systemd-umount">systemd-umount</primary>
759 </indexterm>
760 </listitem>
761 </varlistentry>
762
763 <varlistentry id="systemd-tty-ask-password-agent">
764 <term><command>systemd-tty-ask-password-agent</command></term>
765 <listitem>
766 <para>Is used to list and/or process pending systemd password
767 requests</para>
768 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
769 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
770 </indexterm>
771 </listitem>
772 </varlistentry>
773
774 <varlistentry id="telinit">
775 <term><command>telinit</command></term>
776 <listitem>
777 <para>Tells <command>init</command> which run-level to change
778 to</para>
779 <indexterm zone="ch-system-systemd telinit">
780 <primary sortas="b-telinit">telinit</primary>
781 </indexterm>
782 </listitem>
783 </varlistentry>
784
785 <varlistentry id="timedatectl">
786 <term><command>timedatectl</command></term>
787 <listitem>
788 <para>Is used to query and change the system clock and its settings
789 </para>
790 <indexterm zone="ch-system-systemd timedatectl">
791 <primary sortas="b-timedatectl">timedatectl</primary>
792 </indexterm>
793 </listitem>
794 </varlistentry>
795
796 <varlistentry id="udevadm">
797 <term><command>udevadm</command></term>
798 <listitem>
799 <para>Is a generic udev administration tool which controls the udevd
800 daemon, provides info from the Udev hardware database, monitors
801 uevents, waits for uevents to finish, tests udev configuration, and
802 triggers uevents for a given device</para>
803 <indexterm zone="ch-system-systemd udevadm">
804 <primary sortas="b-udevadm">udevadm</primary>
805 </indexterm>
806 </listitem>
807 </varlistentry>
808
809 <varlistentry id="libsystemd">
810 <term><filename class="libraryfile">libsystemd</filename></term>
811 <listitem>
812 <para>Is the main systemd utility library</para>
813 <indexterm zone="ch-system-systemd libsystemd">
814 <primary sortas="c-libsystemd">libsystemd</primary>
815 </indexterm>
816 </listitem>
817 </varlistentry>
818
819 <varlistentry id="libudev">
820 <term><filename class="libraryfile">libudev</filename></term>
821 <listitem>
822 <para>Is a library to access Udev device information</para>
823 <indexterm zone="ch-system-systemd libudev">
824 <primary sortas="c-libudev">libudev</primary>
825 </indexterm>
826 </listitem>
827 </varlistentry>
828
829 </variablelist>
830
831 </sect2>
832
833</sect1>
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