source: chapter08/systemd.xml@ 45d8933

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Last change on this file since 45d8933 was 2ca70d33, checked in by Douglas R. Reno <renodr@…>, 4 years ago

Update to check-0.15.2
Update to systemd-246

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