source: chapter08/systemd.xml@ 871fd2f

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Last change on this file since 871fd2f was 871fd2f, checked in by Xi Ruoyao <xry111@…>, 21 months ago

systemd: fix systemd-sysext description

Technically it's not a daemon, copy the desc from man page.

  • Property mode set to 100644
File size: 31.6 KB
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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, apply a patch to fix the build with GCC-10 and fix a segfault:</para>
45
46<screen><userinput remap="pre">patch -Np1 -i ../systemd-&systemd-version;-gcc_10-fixes-2.patch</userinput></screen>
47-->
48
49 <!-- For linux-5.11's API headers changing the rfkill_event structure -->
50 <para>First, apply a patch to fix some build issues:</para>
51
52<screen><userinput remap="pre">patch -Np1 -i ../systemd-&systemd-version;-upstream_fixes-1.patch</userinput></screen>
53
54 <para>Remove tests that cannot be built in chroot:</para>
55
56<screen><userinput remap="pre">sed '177,$ d' -i src/resolve/meson.build</userinput></screen>
57
58 <para>Remove an unneeded group,
59 <systemitem class="groupname">render</systemitem>, from the default udev
60 rules:</para>
61
62<screen><userinput remap="pre">sed -i 's/GROUP="render"/GROUP="video"/' rules.d/50-udev-default.rules.in</userinput></screen>
63
64 <para>Prepare systemd for compilation:</para>
65
66<screen><userinput remap="configure">mkdir -p build
67cd build
68
69LANG=en_US.UTF-8 \
70meson --prefix=/usr \
71 --sysconfdir=/etc \
72 --localstatedir=/var \
73 -Dblkid=true \
74 -Dbuildtype=release \
75 -Ddefault-dnssec=no \
76 -Dfirstboot=false \
77 -Dinstall-tests=false \
78 -Dldconfig=false \
79 -Dsysusers=false \
80 -Db_lto=false \
81 -Drpmmacrosdir=no \
82 -Dhomed=false \
83 -Duserdb=false \
84 -Dman=false \
85 -Dmode=release \
86 -Ddocdir=/usr/share/doc/systemd-&systemd-version; \
87 ..</userinput></screen>
88
89 <variablelist>
90 <title>The meaning of the meson options:</title>
91
92 <varlistentry>
93 <term><parameter>-Ddefault-dnssec=no</parameter></term>
94 <listitem>
95 <para>This switch turns off the experimental DNSSEC support.</para>
96 </listitem>
97 </varlistentry>
98
99 <varlistentry>
100 <term><parameter>-Dfirstboot=false</parameter></term>
101 <listitem>
102 <para>This switch prevents installation of systemd
103 services responsible for setting up the system for
104 the first time. They are not useful for LFS because
105 everything is done manually.</para>
106 </listitem>
107 </varlistentry>
108
109 <varlistentry>
110 <term><parameter>-Dinstall-tests=false</parameter></term>
111 <listitem>
112 <para>This switch prevents installation of the compiled tests.</para>
113 </listitem>
114 </varlistentry>
115
116 <varlistentry>
117 <term><parameter>-Dldconfig=false</parameter></term>
118 <listitem>
119 <para>This switch prevents installation of a systemd unit that runs
120 <command>ldconfig</command> at boot, which is not useful for source
121 distributions such as LFS and makes the boot time longer. Remove it
122 if the described feature is desired.</para>
123 </listitem>
124 </varlistentry>
125
126 <varlistentry>
127 <term><parameter>-Dsysusers=false</parameter></term>
128 <listitem>
129 <para>This switch prevents installation of systemd
130 services responsible for setting up the
131 <filename>/etc/group</filename> and
132 <filename>/etc/passwd</filename> files. Both files
133 were created earlier in this chapter.</para>
134 </listitem>
135 </varlistentry>
136
137 <varlistentry>
138 <term><parameter>-Drpmmacrosdir=no</parameter></term>
139 <listitem>
140 <para>This switch disables installation of RPM Macros
141 for use with systemd because LFS does not support RPM.</para>
142 </listitem>
143 </varlistentry>
144
145 <varlistentry>
146 <term><parameter>-D{userdb,homed}=false</parameter></term>
147 <listitem>
148 <para>Remove two daemons that have dependencies that do not fit
149 the scope of LFS.</para>
150 </listitem>
151 </varlistentry>
152
153 <varlistentry>
154 <term><parameter>-Dman=false</parameter></term>
155 <listitem>
156 <para>Prevent the generation of man pages to avoid extra
157 dependencies. We will install pre-generated man pages for systemd
158 from a tarball later.</para>
159 </listitem>
160 </varlistentry>
161
162 <varlistentry>
163 <term><parameter>-Dmode=release</parameter></term>
164 <listitem>
165 <para>Disable some features considered experimental by upstream.
166 </para>
167 </listitem>
168 </varlistentry>
169
170 </variablelist>
171
172 <para>Compile the package:</para>
173
174<screen><userinput remap="make">LANG=en_US.UTF-8 ninja</userinput></screen>
175
176 <para>Install the package:</para>
177
178<screen><userinput remap="install">LANG=en_US.UTF-8 ninja install</userinput></screen>
179
180 <para>Install the man pages:</para>
181
182<screen><userinput remap="install">tar -xf ../../systemd-man-pages-&systemd-man-version;.tar.xz --strip-components=1 -C /usr/share/man</userinput></screen>
183
184 <para>Remove a useless directory:</para>
185
186<screen><userinput remap="install">rm -rf /usr/lib/pam.d</userinput></screen>
187
188 <para>Create the <filename>/etc/machine-id</filename> file needed by
189 <command>systemd-journald</command>:</para>
190
191<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
192
193 <para>Setup the basic target structure:</para>
194
195<screen><userinput remap="adjust">systemctl preset-all</userinput></screen>
196
197 <para>Disable a service that is known to cause problems with systems that
198 use a network configuration other than what is provided by
199 systemd-networkd:</para>
200 <!-- Observed halting startup with dhcpcd handling the primary NIC -->
201
202<screen><userinput remap="adjust">systemctl disable systemd-time-wait-sync.service</userinput></screen>
203
204<!-- dev: 50-pid-max.conf is not removed in BLFS, so I commented the following out.
205 If it causes any trouble, we can add this back and also copy it into BLFS -->
206<!--
207 <para>Prevent systemd from resetting the maximum PID value which causes
208 some problems with packages and units in BLFS:</para>
209
210<screen><userinput remap="adjust">rm -f /usr/lib/sysctl.d/50-pid-max.conf</userinput></screen>
211-->
212
213 </sect2>
214
215 <sect2 id="contents-systemd" role="content">
216 <title>Contents of systemd</title>
217
218 <segmentedlist>
219 <segtitle>Installed programs</segtitle>
220 <segtitle>Installed libraries</segtitle>
221 <segtitle>Installed directories</segtitle>
222
223 <seglistitem>
224 <seg>bootctl, busctl, coredumpctl, halt (symlink to systemctl),
225 hostnamectl, init, journalctl, kernel-install, localectl, loginctl,
226 machinectl, networkctl, oomctl, portablectl, poweroff (symlink to
227 systemctl), reboot (symlink to systemctl), resolvconf (symlink to
228 resolvectl), resolvectl, runlevel (symlink to systemctl), shutdown
229 (symlink to systemctl), systemctl, systemd-analyze,
230 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
231 systemd-cryptenroll, systemd-delta, systemd-detect-virt,
232 systemd-dissect, systemd-escape, systemd-hwdb, systemd-id128,
233 systemd-inhibit, systemd-machine-id-setup,
234 systemd-mount, systemd-notify, systemd-nspawn, systemd-path,
235 systemd-repart, systemd-resolve (symlink to resolvectl), systemd-run,
236 systemd-socket-activate, systemd-stdio-bridge, systemd-sysext,
237 systemd-tmpfiles, systemd-tty-ask-password-agent,
238 systemd-umount (symlink to systemd-mount),
239 telinit (symlink to systemctl), timedatectl, and udevadm</seg>
240 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
241 libnss_resolve.so.2, libnss_systemd.so.2,
242 libsystemd.so, libsystemd-shared-&systemd-version;.so (in /usr/lib/systemd),
243 and libudev.so</seg>
244 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
245 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
246 /etc/xdg/systemd, /usr/lib/systemd, /usr/lib/udev, /usr/include/systemd,
247 /usr/lib/binfmt.d, /usr/lib/environment.d, /usr/lib/kernel,
248 /usr/lib/modules-load.d, /usr/lib/sysctl.d, /usr/lib/systemd,
249 /usr/lib/tmpfiles.d,
250 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
251 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
252 </seglistitem>
253 </segmentedlist>
254
255 <variablelist>
256 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
257 <?dbfo list-presentation="list"?>
258 <?dbhtml list-presentation="table"?>
259
260 <varlistentry id="bootctl">
261 <term><command>bootctl</command></term>
262 <listitem>
263 <para>Is used to query the firmware and boot manager settings</para>
264 <indexterm zone="ch-system-systemd bootctl">
265 <primary sortas="b-bootctl">bootctl</primary>
266 </indexterm>
267 </listitem>
268 </varlistentry>
269
270 <varlistentry id="busctl">
271 <term><command>busctl</command></term>
272 <listitem>
273 <para>Is used to introspect and monitor the D-Bus bus</para>
274 <indexterm zone="ch-system-systemd busctl">
275 <primary sortas="b-busctl">busctl</primary>
276 </indexterm>
277 </listitem>
278 </varlistentry>
279
280 <varlistentry id="coredumpctl">
281 <term><command>coredumpctl</command></term>
282 <listitem>
283 <para>Is used to retrieve coredumps from the systemd journal</para>
284 <indexterm zone="ch-system-systemd coredumpctl">
285 <primary sortas="b-coredumpctl">coredumpctl</primary>
286 </indexterm>
287 </listitem>
288 </varlistentry>
289
290 <varlistentry id="halt">
291 <term><command>halt</command></term>
292 <listitem>
293 <para>Normally invokes <command>shutdown</command> with the
294 <parameter>-h</parameter> option, except when already in run-level 0,
295 then it tells the kernel to halt the system; it notes in the
296 file <filename>/var/log/wtmp</filename> that the system is being
297 brought down</para>
298 <indexterm zone="ch-system-systemd halt">
299 <primary sortas="b-halt">halt</primary>
300 </indexterm>
301 </listitem>
302 </varlistentry>
303
304 <varlistentry id="hostnamectl">
305 <term><command>hostnamectl</command></term>
306 <listitem>
307 <para>Is used to query and change the system hostname and related
308 settings</para>
309 <indexterm zone="ch-system-systemd hostnamectl">
310 <primary sortas="b-hostnamectl">hostnamectl</primary>
311 </indexterm>
312 </listitem>
313 </varlistentry>
314
315 <varlistentry id="init">
316 <term><command>init</command></term>
317 <listitem>
318 <para>Is the first process to be started when the kernel has initialized
319 the hardware which takes over the boot process and starts all
320 processes according to its configuration files. In this case, it starts
321 systemd</para>
322 <indexterm zone="ch-system-systemd init">
323 <primary sortas="b-init">init</primary>
324 </indexterm>
325 </listitem>
326 </varlistentry>
327
328 <varlistentry id="journalctl">
329 <term><command>journalctl</command></term>
330 <listitem>
331 <para>Is used to query the contents of the systemd journal</para>
332 <indexterm zone="ch-system-systemd journalctl">
333 <primary sortas="b-journalctl">journalctl</primary>
334 </indexterm>
335 </listitem>
336 </varlistentry>
337
338 <varlistentry id="kernel-install">
339 <term><command>kernel-install</command></term>
340 <listitem>
341 <para>Is used to add and remove kernel and initramfs images to and
342 from /boot. In LFS, this is done manually</para>
343 <indexterm zone="ch-system-systemd kernel-install">
344 <primary sortas="b-kernel-install">kernel-install</primary>
345 </indexterm>
346 </listitem>
347 </varlistentry>
348
349 <varlistentry id="localectl">
350 <term><command>localectl</command></term>
351 <listitem>
352 <para>Is used to query and change the system locale and keyboard layout
353 settings</para>
354 <indexterm zone="ch-system-systemd localectl">
355 <primary sortas="b-localectl">localectl</primary>
356 </indexterm>
357 </listitem>
358 </varlistentry>
359
360 <varlistentry id="loginctl">
361 <term><command>loginctl</command></term>
362 <listitem>
363 <para>Is used to introspect and control the state of the systemd Login
364 Manager</para>
365 <indexterm zone="ch-system-systemd loginctl">
366 <primary sortas="b-loginctl">loginctl</primary>
367 </indexterm>
368 </listitem>
369 </varlistentry>
370
371 <varlistentry id="machinectl">
372 <term><command>machinectl</command></term>
373 <listitem>
374 <para>Is used to introspect and control the state of the systemd Virtual
375 Machine and Container Registration Manager</para>
376 <indexterm zone="ch-system-systemd machinectl">
377 <primary sortas="b-machinectl">machinectl</primary>
378 </indexterm>
379 </listitem>
380 </varlistentry>
381
382 <varlistentry id="networkctl">
383 <term><command>networkctl</command></term>
384 <listitem>
385 <para>Is used to introspect and configure the state of the network
386 links configured by systemd-networkd</para>
387 <indexterm zone="ch-system-systemd networkctl">
388 <primary sortas="b-networkctl">networkctl</primary>
389 </indexterm>
390 </listitem>
391 </varlistentry>
392
393 <varlistentry id="oomctl">
394 <term><command>oomctl</command></term>
395 <listitem>
396 <para>Controls the systemd Out Of Memory daemon</para>
397 <indexterm zone="ch-system-systemd oomctl">
398 <primary sortas="b-oomctl">oomctl</primary>
399 </indexterm>
400 </listitem>
401 </varlistentry>
402
403 <varlistentry id="portablectl">
404 <term><command>portablectl</command></term>
405 <listitem>
406 <para>Is used to attach or detach portable services from the local
407 system</para>
408 <indexterm zone="ch-system-systemd portablectl">
409 <primary sortas="b-portablectl">portablectl</primary>
410 </indexterm>
411 </listitem>
412 </varlistentry>
413
414 <varlistentry id="poweroff">
415 <term><command>poweroff</command></term>
416 <listitem>
417 <para>Instructs the kernel to halt the system and switch off the computer
418 (see <command>halt</command>)</para>
419 <indexterm zone="ch-system-systemd poweroff">
420 <primary sortas="b-poweroff">poweroff</primary>
421 </indexterm>
422 </listitem>
423 </varlistentry>
424
425 <varlistentry id="reboot">
426 <term><command>reboot</command></term>
427 <listitem>
428 <para>Instructs the kernel to reboot the system (see
429 <command>halt</command>)</para>
430 <indexterm zone="ch-system-systemd reboot">
431 <primary sortas="b-reboot">reboot</primary>
432 </indexterm>
433 </listitem>
434 </varlistentry>
435
436 <varlistentry id="resolvconf">
437 <term><command>resolvconf</command></term>
438 <listitem>
439 <para>Registers DNS server and domain configuration with
440 <command>systemd-resolved</command></para>
441 <indexterm zone="ch-system-systemd resolvconf">
442 <primary sortas="b-resolvconf">resolvconf</primary>
443 </indexterm>
444 </listitem>
445 </varlistentry>
446
447 <varlistentry id="resolvectl">
448 <term><command>resolvectl</command></term>
449 <listitem>
450 <para>Sends control commands to the network name resolution
451 manager, or resolves domain names, IPv4 and IPv6 addresses,
452 DNS records, and services</para>
453 <indexterm zone="ch-system-systemd resolvectl">
454 <primary sortas="b-resolvectl">resolvectl</primary>
455 </indexterm>
456 </listitem>
457 </varlistentry>
458
459 <varlistentry id="runlevel">
460 <term><command>runlevel</command></term>
461 <listitem>
462 <para>Outputs the previous and the current run-level, as noted in the
463 last run-level record in <filename>/run/utmp</filename></para>
464 <indexterm zone="ch-system-systemd runlevel">
465 <primary sortas="b-runlevel">runlevel</primary>
466 </indexterm>
467 </listitem>
468 </varlistentry>
469
470 <varlistentry id="shutdown">
471 <term><command>shutdown</command></term>
472 <listitem>
473 <para>Brings the system down in a safe and secure manner, signaling
474 all processes and notifying all logged-in users</para>
475 <indexterm zone="ch-system-systemd shutdown">
476 <primary sortas="b-shutdown">shutdown</primary>
477 </indexterm>
478 </listitem>
479 </varlistentry>
480
481 <varlistentry id="systemctl">
482 <term><command>systemctl</command></term>
483 <listitem>
484 <para>Is used to introspect and control the state of the systemd system
485 and service manager</para>
486 <indexterm zone="ch-system-systemd systemctl">
487 <primary sortas="b-systemctl">systemctl</primary>
488 </indexterm>
489 </listitem>
490 </varlistentry>
491
492 <varlistentry id="systemd-analyze">
493 <term><command>systemd-analyze</command></term>
494 <listitem>
495 <para>Is used to determine system startup performance of the current
496 boot, as well as identify troublesome systemd units</para>
497 <indexterm zone="ch-system-systemd systemd-analyze">
498 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
499 </indexterm>
500 </listitem>
501 </varlistentry>
502
503 <varlistentry id="systemd-ask-password">
504 <term><command>systemd-ask-password</command></term>
505 <listitem>
506 <para>Is used to query a system password or passphrase from the user,
507 using a question message specified on the command line</para>
508 <indexterm zone="ch-system-systemd systemd-ask-password">
509 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
510 </indexterm>
511 </listitem>
512 </varlistentry>
513
514 <varlistentry id="systemd-cat">
515 <term><command>systemd-cat</command></term>
516 <listitem>
517 <para>Is used to connect the STDOUT and STDERR outputs of a process
518 with the systemd journal
519 </para>
520 <indexterm zone="ch-system-systemd systemd-cat">
521 <primary sortas="b-systemd-cat">systemd-cat</primary>
522 </indexterm>
523 </listitem>
524 </varlistentry>
525
526 <varlistentry id="systemd-cgls">
527 <term><command>systemd-cgls</command></term>
528 <listitem>
529 <para>Recursively shows the contents of the selected Linux control
530 group hierarchy in a tree</para>
531 <indexterm zone="ch-system-systemd systemd-cgls">
532 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
533 </indexterm>
534 </listitem>
535 </varlistentry>
536
537 <varlistentry id="systemd-cgtop">
538 <term><command>systemd-cgtop</command></term>
539 <listitem>
540 <para>Shows the top control groups of the local Linux control group
541 hierarchy, ordered by their CPU, memory and disk I/O load</para>
542 <indexterm zone="ch-system-systemd systemd-cgtop">
543 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
544 </indexterm>
545 </listitem>
546 </varlistentry>
547
548 <varlistentry id="systemd-cryptenroll">
549 <term><command>systemd-cryptenroll</command></term>
550 <listitem>
551 <para>Is used to enroll or remove a system from full disk encryption,
552 as well as set and query private keys and recovery keys</para>
553 <indexterm zone="ch-system-systemd systemd-cryptenroll">
554 <primary sortas="b-systemd-cryptenroll">systemd-cryptenroll</primary>
555 </indexterm>
556 </listitem>
557 </varlistentry>
558
559 <varlistentry id="systemd-delta">
560 <term><command>systemd-delta</command></term>
561 <listitem>
562 <para>Is used to identify and compare configuration files in
563 <filename class="directory">/etc</filename> that override default
564 counterparts in <filename class="directory">/usr</filename></para>
565 <indexterm zone="ch-system-systemd systemd-delta">
566 <primary sortas="b-systemd-delta">systemd-delta</primary>
567 </indexterm>
568 </listitem>
569 </varlistentry>
570
571 <varlistentry id="systemd-detect-virt">
572 <term><command>systemd-detect-virt</command></term>
573 <listitem>
574 <para>Detects whether the system is being run in a virtual
575 environment, and adjusts udev accordingly</para>
576 <indexterm zone="ch-system-systemd systemd-detect-virt">
577 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
578 </indexterm>
579 </listitem>
580 </varlistentry>
581
582 <varlistentry id="systemd-dissect">
583 <term><command>systemd-dissect</command></term>
584 <listitem>
585 <para>Is used to inspect OS disk images</para>
586 <indexterm zone="ch-system-systemd systemd-dissect">
587 <primary sortas="b-systemd-dissect">systemd-dissect</primary>
588 </indexterm>
589 </listitem>
590 </varlistentry>
591
592 <varlistentry id="systemd-escape">
593 <term><command>systemd-escape</command></term>
594 <listitem>
595 <para>Is used to escape strings for inclusion in systemd unit
596 names</para>
597 <indexterm zone="ch-system-systemd systemd-escape">
598 <primary sortas="b-systemd-escape">systemd-escape</primary>
599 </indexterm>
600 </listitem>
601 </varlistentry>
602
603 <varlistentry id="systemd-hwdb">
604 <term><command>systemd-hwdb</command></term>
605 <listitem>
606 <para>Is used to manage the hardware database (hwdb)</para>
607 <indexterm zone="ch-system-systemd systemd-hwdb">
608 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
609 </indexterm>
610 </listitem>
611 </varlistentry>
612
613 <varlistentry id="systemd-id128">
614 <term><command>systemd-id128</command></term>
615 <listitem>
616 <para>Generates and prints id128 strings</para>
617 <indexterm zone="ch-system-systemd systemd-id128">
618 <primary sortas="b-systemd-id128">systemd-id128</primary>
619 </indexterm>
620 </listitem>
621 </varlistentry>
622
623 <varlistentry id="systemd-inhibit">
624 <term><command>systemd-inhibit</command></term>
625 <listitem>
626 <para>Is used to execute a program with a shutdown, sleep or idle
627 inhibitor lock taken, preventing an action such as a system shutdown
628 until the process is completed</para>
629 <indexterm zone="ch-system-systemd systemd-inhibit">
630 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
631 </indexterm>
632 </listitem>
633 </varlistentry>
634
635 <varlistentry id="systemd-machine-id-setup">
636 <term><command>systemd-machine-id-setup</command></term>
637 <listitem>
638 <para>Is used by system installer tools to initialize the machine ID
639 stored in <filename>/etc/machine-id</filename> at install time with a
640 randomly generated ID</para>
641 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
642 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
643 </indexterm>
644 </listitem>
645 </varlistentry>
646
647 <varlistentry id="systemd-mount">
648 <term><command>systemd-mount</command></term>
649 <listitem>
650 <para>Is used to temporarily mount or automount disks</para>
651 <indexterm zone="ch-system-systemd systemd-mount">
652 <primary sortas="b-systemd-mount">systemd-mount</primary>
653 </indexterm>
654 </listitem>
655 </varlistentry>
656
657 <varlistentry id="systemd-notify">
658 <term><command>systemd-notify</command></term>
659 <listitem>
660 <para>Is used by daemon scripts to notify the init system about status
661 changes</para>
662 <indexterm zone="ch-system-systemd systemd-notify">
663 <primary sortas="b-systemd-notify">systemd-notify</primary>
664 </indexterm>
665 </listitem>
666 </varlistentry>
667
668 <varlistentry id="systemd-nspawn">
669 <term><command>systemd-nspawn</command></term>
670 <listitem>
671 <para>Is used to run a command or OS in a light-weight namespace
672 container</para>
673 <indexterm zone="ch-system-systemd systemd-nspawn">
674 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
675 </indexterm>
676 </listitem>
677 </varlistentry>
678
679 <varlistentry id="systemd-path">
680 <term><command>systemd-path</command></term>
681 <listitem>
682 <para>Is used to query system and user paths</para>
683 <indexterm zone="ch-system-systemd systemd-path">
684 <primary sortas="b-systemd-path">systemd-path</primary>
685 </indexterm>
686 </listitem>
687 </varlistentry>
688
689 <varlistentry id="systemd-repart">
690 <term><command>systemd-repart</command></term>
691 <listitem>
692 <para>Is used to grow and add partitions to a partition table when
693 systemd is used in an OS image (e.g. a container)</para>
694 <indexterm zone="ch-system-systemd systemd-repart">
695 <primary sortas="b-systemd-repart">systemd-repart</primary>
696 </indexterm>
697 </listitem>
698 </varlistentry>
699
700 <varlistentry id="systemd-resolve">
701 <term><command>systemd-resolve</command></term>
702 <listitem>
703 <para>Is used to resolve domain names, IPV4 and IPv6 addresses, DNS
704 resource records, and services</para>
705 <indexterm zone="ch-system-systemd systemd-resolve">
706 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
707 </indexterm>
708 </listitem>
709 </varlistentry>
710
711 <varlistentry id="systemd-run">
712 <term><command>systemd-run</command></term>
713 <listitem>
714 <para>Is used to create and start a transient .service or a .scope
715 unit and run the specified command in it. This is useful for
716 validating systemd units</para>
717 <indexterm zone="ch-system-systemd systemd-run">
718 <primary sortas="b-systemd-run">systemd-run</primary>
719 </indexterm>
720 </listitem>
721 </varlistentry>
722
723 <varlistentry id="systemd-socket-activate">
724 <term><command>systemd-socket-activate</command></term>
725 <listitem>
726 <para>Is used to listen on socket devices and launch a process upon
727 a successful connection to the socket</para>
728 <indexterm zone="ch-system-systemd systemd-socket-activate">
729 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
730 </indexterm>
731 </listitem>
732 </varlistentry>
733
734 <varlistentry id="systemd-sysext">
735 <term><command>systemd-sysext</command></term>
736 <listitem>
737 <para>Activates system extension images</para>
738 <indexterm zone="ch-system-systemd systemd-sysext">
739 <primary sortas="b-systemd-sysext">systemd-sysext</primary>
740 </indexterm>
741 </listitem>
742 </varlistentry>
743
744 <varlistentry id="systemd-tmpfiles">
745 <term><command>systemd-tmpfiles</command></term>
746 <listitem>
747 <para>Creates, deletes and cleans up volatile and temporary files and
748 directories, based on the configuration file format and location
749 specified in
750 <filename class="directory">tmpfiles.d</filename> directories</para>
751 <indexterm zone="ch-system-systemd systemd-tmpfiles">
752 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
753 </indexterm>
754 </listitem>
755 </varlistentry>
756
757 <varlistentry id="systemd-umount">
758 <term><command>systemd-umount</command></term>
759 <listitem>
760 <para>Unmounts mount points</para>
761 <indexterm zone="ch-system-systemd systemd-umount">
762 <primary sortas="b-systemd-umount">systemd-umount</primary>
763 </indexterm>
764 </listitem>
765 </varlistentry>
766
767 <varlistentry id="systemd-tty-ask-password-agent">
768 <term><command>systemd-tty-ask-password-agent</command></term>
769 <listitem>
770 <para>Is used to list and/or process pending systemd password
771 requests</para>
772 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
773 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
774 </indexterm>
775 </listitem>
776 </varlistentry>
777
778 <varlistentry id="telinit">
779 <term><command>telinit</command></term>
780 <listitem>
781 <para>Tells <command>init</command> which run-level to change
782 to</para>
783 <indexterm zone="ch-system-systemd telinit">
784 <primary sortas="b-telinit">telinit</primary>
785 </indexterm>
786 </listitem>
787 </varlistentry>
788
789 <varlistentry id="timedatectl">
790 <term><command>timedatectl</command></term>
791 <listitem>
792 <para>Is used to query and change the system clock and its settings
793 </para>
794 <indexterm zone="ch-system-systemd timedatectl">
795 <primary sortas="b-timedatectl">timedatectl</primary>
796 </indexterm>
797 </listitem>
798 </varlistentry>
799
800 <varlistentry id="udevadm">
801 <term><command>udevadm</command></term>
802 <listitem>
803 <para>Is a generic udev administration tool which controls the udevd
804 daemon, provides info from the Udev hardware database, monitors
805 uevents, waits for uevents to finish, tests udev configuration, and
806 triggers uevents for a given device</para>
807 <indexterm zone="ch-system-systemd udevadm">
808 <primary sortas="b-udevadm">udevadm</primary>
809 </indexterm>
810 </listitem>
811 </varlistentry>
812
813 <varlistentry id="libsystemd">
814 <term><filename class="libraryfile">libsystemd</filename></term>
815 <listitem>
816 <para>Is the main systemd utility library</para>
817 <indexterm zone="ch-system-systemd libsystemd">
818 <primary sortas="c-libsystemd">libsystemd</primary>
819 </indexterm>
820 </listitem>
821 </varlistentry>
822
823 <varlistentry id="libudev">
824 <term><filename class="libraryfile">libudev</filename></term>
825 <listitem>
826 <para>Is a library to access Udev device information</para>
827 <indexterm zone="ch-system-systemd libudev">
828 <primary sortas="c-libudev">libudev</primary>
829 </indexterm>
830 </listitem>
831 </varlistentry>
832
833 </variablelist>
834
835 </sect2>
836
837</sect1>
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