source: chapter06/systemd.xml@ b7b0eea

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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-system-systemd" role="wrap" revision="systemd">
9 <?dbhtml filename="systemd.html"?>
10
11 <sect1info condition="script">
12 <productname>systemd</productname>
13 <productnumber>&systemd-version;</productnumber>
14 <address>&systemd-url;</address>
15 </sect1info>
16
17 <title>Systemd-&systemd-version;</title>
18
19 <indexterm zone="ch-system-systemd">
20 <primary sortas="a-systemd">systemd</primary>
21 </indexterm>
22
23 <sect2 role="package">
24 <title/>
25
26 <para>The systemd package contains programs for controlling the startup,
27 running, and shutdown of the system.</para>
28
29 <segmentedlist>
30 <segtitle>&buildtime;</segtitle>
31 <segtitle>&diskspace;</segtitle>
32
33 <seglistitem>
34 <seg>&systemd-ch6-sbu;</seg>
35 <seg>&systemd-ch6-du;</seg>
36 </seglistitem>
37 </segmentedlist>
38 </sect2>
39
40 <sect2 role="installation">
41 <title>Installation of systemd</title>
42<!--
43 <para>First, apply a patch to fix various bugs since the release
44 of systemd-243.</para>
45
46<screen><userinput remap="pre">patch -Np1 -i ../systemd-&systemd-version;-consolidated_fixes-2.patch</userinput></screen>
47-->
48
49 <para>Create a symlink to work around missing xsltproc:</para>
50
51<screen><userinput remap="pre">ln -sf /tools/bin/true /usr/bin/xsltproc</userinput></screen>
52
53 <para>Because we have not yet installed the final version of Util-Linux,
54 create links to the libraries in the approprite location:</para>
55
56<screen><userinput remap="pre">for file in /tools/lib/lib{blkid,mount,uuid}.so*; do
57 ln -sf $file /usr/lib/
58done</userinput></screen>
59
60 <para>Set up the man pages:</para>
61
62<screen><userinput remap="pre">tar -xf ../systemd-man-pages-&systemd-version;.tar.xz</userinput></screen>
63
64 <para>Remove tests that cannot be built in chroot:</para>
65
66<screen><userinput remap="pre">sed '177,$ d' -i src/resolve/meson.build</userinput></screen>
67
68 <para>Remove an unneeded group,
69 <systemitem class="groupname">render</systemitem>, from the default udev
70 rules:</para>
71
72<screen><userinput remap="pre">sed -i 's/GROUP="render", //' rules.d/50-udev-default.rules.in</userinput></screen>
73
74 <para>Prepare systemd for compilation:</para>
75
76<screen><userinput remap="configure">mkdir -p build
77cd build
78
79PKG_CONFIG_PATH="/usr/lib/pkgconfig:/tools/lib/pkgconfig" \
80LANG=en_US.UTF-8 \
81meson --prefix=/usr \
82 --sysconfdir=/etc \
83 --localstatedir=/var \
84 -Dblkid=true \
85 -Dbuildtype=release \
86 -Ddefault-dnssec=no \
87 -Dfirstboot=false \
88 -Dinstall-tests=false \
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 -Drpmmacrosdir=no \
100 ..</userinput></screen>
101
102 <variablelist>
103 <title>The meaning of the meson options:</title>
104
105 <varlistentry>
106 <term><parameter>-D*-path=*</parameter></term>
107 <listitem>
108 <para>These switches provide location of binaries needed by
109 systemd at runtime that have not yet been installed, or who's
110 pkgconfig files are currently only in
111 <filename>/tools/lib/pkgconfig</filename>.</para>
112 </listitem>
113 </varlistentry>
114
115 <varlistentry>
116 <term><parameter>-Ddefault-dnssec=no</parameter></term>
117 <listitem>
118 <para>This switch turns off the experimental DNSSEC support.</para>
119 </listitem>
120 </varlistentry>
121
122 <varlistentry>
123 <term><parameter>-Dfirstboot=false</parameter></term>
124 <listitem>
125 <para>This switch prevents installation of systemd
126 services responsible for setting up the system for
127 the first time. They are not useful for LFS because
128 everything is done manually.</para>
129 </listitem>
130 </varlistentry>
131
132 <varlistentry>
133 <term><parameter>-Dinstall-tests=false</parameter></term>
134 <listitem>
135 <para>This switch prevents installation of the compiled tests.</para>
136 </listitem>
137 </varlistentry>
138
139 <varlistentry>
140 <term><parameter>-Dldconfig=false</parameter></term>
141 <listitem>
142 <para>This switch prevents installation of a systemd unit that runs
143 <command>ldconfig</command> at boot, which is not useful for source
144 distributions such as LFS and makes the boot time longer. Remove it
145 if the described feature is desired.</para>
146 </listitem>
147 </varlistentry>
148
149 <varlistentry>
150 <term><parameter>-Droot*</parameter></term>
151 <listitem>
152 <para>These switches ensure that core programs and
153 shared libraries are installed in the subdirectories
154 of the root partition.</para>
155 </listitem>
156 </varlistentry>
157
158 <varlistentry>
159 <term><parameter>-Dsplit-usr=true</parameter></term>
160 <listitem>
161 <para>This switch ensures that systemd will work on
162 systems where /bin, /lib and /sbin directories are not
163 symlinks to their /usr counterparts.</para>
164 </listitem>
165 </varlistentry>
166
167 <varlistentry>
168 <term><parameter>-Dsysusers=false</parameter></term>
169 <listitem>
170 <para>This switch prevents installation of systemd
171 services responsible for setting up the
172 <filename>/etc/group</filename> and
173 <filename>/etc/passwd</filename> files. Both files
174 were created earlier in this chapter.</para>
175 </listitem>
176 </varlistentry>
177
178 <varlistentry>
179 <term><parameter>-Drpmmacrosdir=no</parameter></term>
180 <listitem>
181 <para>This switch disables installation of RPM Macros
182 for use with systemd because LFS does not support RPM.</para>
183 </listitem>
184 </varlistentry>
185 </variablelist>
186
187 <para>Compile the package:</para>
188
189<screen><userinput remap="make">LANG=en_US.UTF-8 ninja</userinput></screen>
190<!--
191 <para>To test the package, execute the following command:</para>
192
193<screen><userinput remap="test">LANG=en_US.UTF-8 ninja test</userinput></screen>
194-->
195 <para>Install the package:</para>
196
197<screen><userinput remap="install">LANG=en_US.UTF-8 ninja install</userinput></screen>
198
199 <para>Remove an unnecessary symbolic link:</para>
200
201<screen><userinput remap="install">rm -f /usr/bin/xsltproc</userinput></screen>
202
203 <para>Create the <filename>/etc/machine-id</filename> file needed by
204 <command>systemd-journald</command>:</para>
205
206<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
207
208 <para>Setup the basic target structure:</para>
209
210<screen><userinput remap="adjust">systemctl preset-all</userinput></screen>
211
212 <para>Disable a service that is known to cause problems with systems that
213 use a network configuration other than what is provided by
214 systemd-networkd:</para>
215 <!-- Observed halting startup with dhcpcd handling the primary NIC -->
216
217<screen><userinput remap="adjust">systemctl disable systemd-time-wait-sync.service</userinput></screen>
218
219 <para>Prevent systemd from resetting the maximum PID value which causes
220 some problems with packages and units in BLFS:</para>
221 <!-- FCRON in particular -->
222
223<screen><userinput remap="adjust">rm -f /etc/sysctl.d/50-pid-max.conf</userinput></screen>
224
225 <para>Cleanup symbolic links to Util-Linux libraries:</para>
226
227<screen><userinput remap="adjust">rm -fv /usr/lib/lib{blkid,uuid,mount}.so*</userinput></screen>
228
229 <para>Prevent systemd from creating <filename>/run/nologin</filename>
230 to allow unprivileged user logins without
231 <application>systemd-logind</application>:</para>
232
233<screen><userinput remap="adjust">rm -f /usr/lib/tmpfiles.d/systemd-nologin.conf</userinput></screen>
234
235 </sect2>
236
237 <sect2 id="contents-systemd" role="content">
238 <title>Contents of systemd</title>
239
240 <segmentedlist>
241 <segtitle>Installed programs</segtitle>
242 <segtitle>Installed libraries</segtitle>
243 <segtitle>Installed directories</segtitle>
244
245 <seglistitem>
246 <seg>bootctl, busctl, coredumpctl, halt (symlink to systemctl),
247 hostnamectl, init, journalctl, kernel-install, localectl, loginctl,
248 machinectl, networkctl, portablectl, poweroff (symlink to
249 systemctl), reboot (symlink to systemctl), resolvconf (symlink to
250 resolvectl), resolvectl, runlevel (symlink to systemctl), shutdown
251 (symlink to systemctl), systemctl, systemd-analyze,
252 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
253 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
254 systemd-id128, systemd-inhibit, systemd-machine-id-setup,
255 systemd-mount, systemd-notify, systemd-nspawn, systemd-path,
256 systemd-resolve (symlink to resolvectl), systemd-run,
257 systemd-socket-activate, systemd-stdio-bridge, systemd-tmpfiles,
258 systemd-tty-ask-password-agent, systemd-umount (symlink to
259 systemd-mount), telinit (symlink to systemctl), timedatectl, and
260 udevadm</seg>
261 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
262 libnss_resolve.so.2, libnss_systemd.so.2,
263 libsystemd.so, libsystemd-shared-&systemd-version;.so (in /lib/systemd),
264 and libudev.so</seg>
265 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
266 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
267 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
268 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
269 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
270 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
271 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
272 </seglistitem>
273 </segmentedlist>
274
275 <variablelist>
276 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
277 <?dbfo list-presentation="list"?>
278 <?dbhtml list-presentation="table"?>
279
280 <varlistentry id="bootctl">
281 <term><command>bootctl</command></term>
282 <listitem>
283 <para>Used to query the firmware and boot manager settings</para>
284 <indexterm zone="ch-system-systemd bootctl">
285 <primary sortas="b-bootctl">bootctl</primary>
286 </indexterm>
287 </listitem>
288 </varlistentry>
289
290 <varlistentry id="busctl">
291 <term><command>busctl</command></term>
292 <listitem>
293 <para>Used to introspect and monitor the D-Bus bus</para>
294 <indexterm zone="ch-system-systemd busctl">
295 <primary sortas="b-busctl">busctl</primary>
296 </indexterm>
297 </listitem>
298 </varlistentry>
299
300 <varlistentry id="coredumpctl">
301 <term><command>coredumpctl</command></term>
302 <listitem>
303 <para>Used to retrieve coredumps from the systemd journal</para>
304 <indexterm zone="ch-system-systemd coredumpctl">
305 <primary sortas="b-coredumpctl">coredumpctl</primary>
306 </indexterm>
307 </listitem>
308 </varlistentry>
309
310 <varlistentry id="halt">
311 <term><command>halt</command></term>
312 <listitem>
313 <para>Normally invokes <command>shutdown</command> with the
314 <parameter>-h</parameter> option, except when already in run-level 0,
315 then it tells the kernel to halt the system; it notes in the
316 file <filename>/var/log/wtmp</filename> that the system is being
317 brought down</para>
318 <indexterm zone="ch-system-systemd halt">
319 <primary sortas="b-halt">halt</primary>
320 </indexterm>
321 </listitem>
322 </varlistentry>
323
324 <varlistentry id="hostnamectl">
325 <term><command>hostnamectl</command></term>
326 <listitem>
327 <para>Used to query and change the system hostname and related
328 settings</para>
329 <indexterm zone="ch-system-systemd hostnamectl">
330 <primary sortas="b-hostnamectl">hostnamectl</primary>
331 </indexterm>
332 </listitem>
333 </varlistentry>
334
335 <varlistentry id="init">
336 <term><command>init</command></term>
337 <listitem>
338 <para>The first process to be started when the kernel has initialized
339 the hardware which takes over the boot process and starts all
340 processes according to its configuration files</para>
341 <indexterm zone="ch-system-systemd init">
342 <primary sortas="b-init">init</primary>
343 </indexterm>
344 </listitem>
345 </varlistentry>
346
347 <varlistentry id="journalctl">
348 <term><command>journalctl</command></term>
349 <listitem>
350 <para>Used to query the contents of the systemd journal</para>
351 <indexterm zone="ch-system-systemd journalctl">
352 <primary sortas="b-journalctl">journalctl</primary>
353 </indexterm>
354 </listitem>
355 </varlistentry>
356
357 <varlistentry id="kernel-install">
358 <term><command>kernel-install</command></term>
359 <listitem>
360 <para>Used to add and remove kernel and initramfs images to and
361 from /boot</para>
362 <indexterm zone="ch-system-systemd kernel-install">
363 <primary sortas="b-kernel-install">kernel-install</primary>
364 </indexterm>
365 </listitem>
366 </varlistentry>
367
368 <varlistentry id="localectl">
369 <term><command>localectl</command></term>
370 <listitem>
371 <para>Used to query and change the system locale and keyboard layout
372 settings</para>
373 <indexterm zone="ch-system-systemd localectl">
374 <primary sortas="b-localectl">localectl</primary>
375 </indexterm>
376 </listitem>
377 </varlistentry>
378
379 <varlistentry id="loginctl">
380 <term><command>loginctl</command></term>
381 <listitem>
382 <para>Used to introspect and control the state of the systemd Login
383 Manager</para>
384 <indexterm zone="ch-system-systemd loginctl">
385 <primary sortas="b-loginctl">loginctl</primary>
386 </indexterm>
387 </listitem>
388 </varlistentry>
389
390 <varlistentry id="machinectl">
391 <term><command>machinectl</command></term>
392 <listitem>
393 <para>Used to introspect and control the state of the systemd Virtual
394 Machine and Container Registration Manager</para>
395 <indexterm zone="ch-system-systemd machinectl">
396 <primary sortas="b-machinectl">machinectl</primary>
397 </indexterm>
398 </listitem>
399 </varlistentry>
400
401 <varlistentry id="networkctl">
402 <term><command>networkctl</command></term>
403 <listitem>
404 <para>Used to introspect the state of the network links as seen by
405 systemd-networkd</para>
406 <indexterm zone="ch-system-systemd networkctl">
407 <primary sortas="b-networkctl">networkctl</primary>
408 </indexterm>
409 </listitem>
410 </varlistentry>
411
412 <varlistentry id="portablectl">
413 <term><command>portablectl</command></term>
414 <listitem>
415 <para>Used to attach or detach portable services from the local
416 system</para>
417 <indexterm zone="ch-system-systemd portablectl">
418 <primary sortas="b-portablectl">portablectl</primary>
419 </indexterm>
420 </listitem>
421 </varlistentry>
422
423 <varlistentry id="poweroff">
424 <term><command>poweroff</command></term>
425 <listitem>
426 <para>Tells the kernel to halt the system and switch off the computer
427 (see <command>halt</command>)</para>
428 <indexterm zone="ch-system-systemd poweroff">
429 <primary sortas="b-poweroff">poweroff</primary>
430 </indexterm>
431 </listitem>
432 </varlistentry>
433
434 <varlistentry id="reboot">
435 <term><command>reboot</command></term>
436 <listitem>
437 <para>Tells the kernel to reboot the system (see
438 <command>halt</command>)</para>
439 <indexterm zone="ch-system-systemd reboot">
440 <primary sortas="b-reboot">reboot</primary>
441 </indexterm>
442 </listitem>
443 </varlistentry>
444
445 <varlistentry id="resolvconf">
446 <term><command>resolvconf</command></term>
447 <listitem>
448 <para>Register DNS server and domain configuration with
449 <command>systemd-resolved</command></para>
450 <indexterm zone="ch-system-systemd resolvconf">
451 <primary sortas="b-resolvconf">resolvconf</primary>
452 </indexterm>
453 </listitem>
454 </varlistentry>
455
456 <varlistentry id="resolvectl">
457 <term><command>resolvectl</command></term>
458 <listitem>
459 <para>Send control commands to the network name resolution
460 manager, or resolve domain names, IPv4 and IPv6 addresses,
461 DNS records, and services.</para>
462 <indexterm zone="ch-system-systemd resolvectl">
463 <primary sortas="b-resolvectl">resolvectl</primary>
464 </indexterm>
465 </listitem>
466 </varlistentry>
467
468 <varlistentry id="runlevel">
469 <term><command>runlevel</command></term>
470 <listitem>
471 <para>Reports the previous and the current run-level, as noted in the
472 last run-level record in <filename>/var/run/utmp</filename></para>
473 <indexterm zone="ch-system-systemd runlevel">
474 <primary sortas="b-runlevel">runlevel</primary>
475 </indexterm>
476 </listitem>
477 </varlistentry>
478
479 <varlistentry id="shutdown">
480 <term><command>shutdown</command></term>
481 <listitem>
482 <para>Brings the system down in a secure way, signaling all processes
483 and notifying all logged-in users</para>
484 <indexterm zone="ch-system-systemd shutdown">
485 <primary sortas="b-shutdown">shutdown</primary>
486 </indexterm>
487 </listitem>
488 </varlistentry>
489
490 <varlistentry id="systemctl">
491 <term><command>systemctl</command></term>
492 <listitem>
493 <para>Used to introspect and control the state of the systemd system
494 and service manager</para>
495 <indexterm zone="ch-system-systemd systemctl">
496 <primary sortas="b-systemctl">systemctl</primary>
497 </indexterm>
498 </listitem>
499 </varlistentry>
500
501 <varlistentry id="systemd-analyze">
502 <term><command>systemd-analyze</command></term>
503 <listitem>
504 <para>Used to determine system boot-up performance of the current
505 boot</para>
506 <indexterm zone="ch-system-systemd systemd-analyze">
507 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
508 </indexterm>
509 </listitem>
510 </varlistentry>
511
512 <varlistentry id="systemd-ask-password">
513 <term><command>systemd-ask-password</command></term>
514 <listitem>
515 <para>Used to query a system password or passphrase from the user,
516 using a question message specified on the command line</para>
517 <indexterm zone="ch-system-systemd systemd-ask-password">
518 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
519 </indexterm>
520 </listitem>
521 </varlistentry>
522
523 <varlistentry id="systemd-cat">
524 <term><command>systemd-cat</command></term>
525 <listitem>
526 <para>Used to connect STDOUT and STDERR of a process with the Journal
527 </para>
528 <indexterm zone="ch-system-systemd systemd-cat">
529 <primary sortas="b-systemd-cat">systemd-cat</primary>
530 </indexterm>
531 </listitem>
532 </varlistentry>
533
534 <varlistentry id="systemd-cgls">
535 <term><command>systemd-cgls</command></term>
536 <listitem>
537 <para>Recursively shows the contents of the selected Linux control
538 group hierarchy in a tree</para>
539 <indexterm zone="ch-system-systemd systemd-cgls">
540 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
541 </indexterm>
542 </listitem>
543 </varlistentry>
544
545 <varlistentry id="systemd-cgtop">
546 <term><command>systemd-cgtop</command></term>
547 <listitem>
548 <para>Shows the top control groups of the local Linux control group
549 hierarchy, ordered by their CPU, memory and disk I/O load</para>
550 <indexterm zone="ch-system-systemd systemd-cgtop">
551 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
552 </indexterm>
553 </listitem>
554 </varlistentry>
555
556 <varlistentry id="systemd-delta">
557 <term><command>systemd-delta</command></term>
558 <listitem>
559 <para>Used to identify and compare configuration files in
560 <filename class="directory">/etc</filename> that override default
561 counterparts in <filename class="directory">/usr</filename></para>
562 <indexterm zone="ch-system-systemd systemd-delta">
563 <primary sortas="b-systemd-delta">systemd-delta</primary>
564 </indexterm>
565 </listitem>
566 </varlistentry>
567
568 <varlistentry id="systemd-detect-virt">
569 <term><command>systemd-detect-virt</command></term>
570 <listitem>
571 <para>Detects execution in a virtualized environment</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-escape">
579 <term><command>systemd-escape</command></term>
580 <listitem>
581 <para>Used to escape strings for inclusion in systemd unit
582 names</para>
583 <indexterm zone="ch-system-systemd systemd-escape">
584 <primary sortas="b-systemd-escape">systemd-escape</primary>
585 </indexterm>
586 </listitem>
587 </varlistentry>
588
589 <varlistentry id="systemd-hwdb">
590 <term><command>systemd-hwdb</command></term>
591 <listitem>
592 <para>Used to manage hardware database (hwdb)</para>
593 <indexterm zone="ch-system-systemd systemd-hwdb">
594 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
595 </indexterm>
596 </listitem>
597 </varlistentry>
598
599 <varlistentry id="systemd-id128">
600 <term><command>systemd-id128</command></term>
601 <listitem>
602 <para>Generate and print id128 strings</para>
603 <indexterm zone="ch-system-systemd systemd-id128">
604 <primary sortas="b-systemd-id128">systemd-id128</primary>
605 </indexterm>
606 </listitem>
607 </varlistentry>
608
609 <varlistentry id="systemd-inhibit">
610 <term><command>systemd-inhibit</command></term>
611 <listitem>
612 <para>Used to execute a program with a shutdown, sleep or idle
613 inhibitor lock taken</para>
614 <indexterm zone="ch-system-systemd systemd-inhibit">
615 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
616 </indexterm>
617 </listitem>
618 </varlistentry>
619
620 <varlistentry id="systemd-machine-id-setup">
621 <term><command>systemd-machine-id-setup</command></term>
622 <listitem>
623 <para>Used by system installer tools to initialize the machine ID
624 stored in <filename>/etc/machine-id</filename> at install time with a
625 randomly generated ID</para>
626 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
627 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
628 </indexterm>
629 </listitem>
630 </varlistentry>
631
632 <varlistentry id="systemd-mount">
633 <term><command>systemd-mount</command></term>
634 <listitem>
635 <para>A tool to temporarily mount or auto-mount a drive.</para>
636 <indexterm zone="ch-system-systemd systemd-mount">
637 <primary sortas="b-systemd-mount">systemd-mount</primary>
638 </indexterm>
639 </listitem>
640 </varlistentry>
641
642 <varlistentry id="systemd-notify">
643 <term><command>systemd-notify</command></term>
644 <listitem>
645 <para>Used by daemon scripts to notify the init system about status
646 changes</para>
647 <indexterm zone="ch-system-systemd systemd-notify">
648 <primary sortas="b-systemd-notify">systemd-notify</primary>
649 </indexterm>
650 </listitem>
651 </varlistentry>
652
653 <varlistentry id="systemd-nspawn">
654 <term><command>systemd-nspawn</command></term>
655 <listitem>
656 <para>Used to run a command or OS in a light-weight namespace
657 container</para>
658 <indexterm zone="ch-system-systemd systemd-nspawn">
659 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
660 </indexterm>
661 </listitem>
662 </varlistentry>
663
664 <varlistentry id="systemd-path">
665 <term><command>systemd-path</command></term>
666 <listitem>
667 <para>Used to query system and user paths</para>
668 <indexterm zone="ch-system-systemd systemd-path">
669 <primary sortas="b-systemd-path">systemd-path</primary>
670 </indexterm>
671 </listitem>
672 </varlistentry>
673
674 <varlistentry id="systemd-resolve">
675 <term><command>systemd-resolve</command></term>
676 <listitem>
677 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
678 resource records, and services</para>
679 <indexterm zone="ch-system-systemd systemd-resolve">
680 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
681 </indexterm>
682 </listitem>
683 </varlistentry>
684
685 <varlistentry id="systemd-run">
686 <term><command>systemd-run</command></term>
687 <listitem>
688 <para>Used to create and start a transient .service or a .scope unit
689 and run the specified command in it</para>
690 <indexterm zone="ch-system-systemd systemd-run">
691 <primary sortas="b-systemd-run">systemd-run</primary>
692 </indexterm>
693 </listitem>
694 </varlistentry>
695
696 <!-- <varlistentry id="systemd-stdio-bridge">
697 <term><command>systemd-stdio-bridge</command></term>
698 <listitem>
699 <para>To be completed</para>
700 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
701 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
702 </indexterm>
703 </listitem>
704 </varlistentry> -->
705
706 <varlistentry id="systemd-socket-activate">
707 <term><command>systemd-socket-activate</command></term>
708 <listitem>
709 <para>A tool to listen on socket devices and launch a process upon
710 connection.</para>
711 <indexterm zone="ch-system-systemd systemd-socket-activate">
712 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
713 </indexterm>
714 </listitem>
715 </varlistentry>
716
717 <varlistentry id="systemd-tmpfiles">
718 <term><command>systemd-tmpfiles</command></term>
719 <listitem>
720 <para>Creates, deletes and cleans up volatile and temporary files and
721 directories, based on the configuration file format and location
722 specified in
723 <filename class="directory">tmpfiles.d</filename> directories</para>
724 <indexterm zone="ch-system-systemd systemd-tmpfiles">
725 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
726 </indexterm>
727 </listitem>
728 </varlistentry>
729
730 <varlistentry id="systemd-umount">
731 <term><command>systemd-umount</command></term>
732 <listitem>
733 <para>Unmount mount points</para>
734 <indexterm zone="ch-system-systemd systemd-umount">
735 <primary sortas="b-systemd-umount">systemd-umount</primary>
736 </indexterm>
737 </listitem>
738 </varlistentry>
739
740 <varlistentry id="systemd-tty-ask-password-agent">
741 <term><command>systemd-tty-ask-password-agent</command></term>
742 <listitem>
743 <para>Used to list or process pending systemd password requests</para>
744 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
745 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
746 </indexterm>
747 </listitem>
748 </varlistentry>
749
750 <varlistentry id="telinit">
751 <term><command>telinit</command></term>
752 <listitem>
753 <para>Tells <command>init</command> which run-level to change
754 to</para>
755 <indexterm zone="ch-system-systemd telinit">
756 <primary sortas="b-telinit">telinit</primary>
757 </indexterm>
758 </listitem>
759 </varlistentry>
760
761 <varlistentry id="timedatectl">
762 <term><command>timedatectl</command></term>
763 <listitem>
764 <para>Used to query and change the system clock and its settings
765 </para>
766 <indexterm zone="ch-system-systemd timedatectl">
767 <primary sortas="b-timedatectl">timedatectl</primary>
768 </indexterm>
769 </listitem>
770 </varlistentry>
771
772 <varlistentry id="udevadm">
773 <term><command>udevadm</command></term>
774 <listitem>
775 <para>Generic udev administration tool: controls the udevd daemon,
776 provides info from the Udev database, monitors uevents, waits for
777 uevents to finish, tests udev configuration, and triggers uevents
778 for a given device</para>
779 <indexterm zone="ch-system-systemd udevadm">
780 <primary sortas="b-udevadm">udevadm</primary>
781 </indexterm>
782 </listitem>
783 </varlistentry>
784
785 <varlistentry id="libsystemd">
786 <term><filename class="libraryfile">libsystemd</filename></term>
787 <listitem>
788 <para>The main systemd utility library</para>
789 <indexterm zone="ch-system-systemd libsystemd">
790 <primary sortas="c-libsystemd">libsystemd</primary>
791 </indexterm>
792 </listitem>
793 </varlistentry>
794
795 <varlistentry id="libudev">
796 <term><filename class="libraryfile">libudev</filename></term>
797 <listitem>
798 <para>A library to access Udev device information</para>
799 <indexterm zone="ch-system-systemd libudev">
800 <primary sortas="c-libudev">libudev</primary>
801 </indexterm>
802 </listitem>
803 </varlistentry>
804
805 </variablelist>
806
807 </sect2>
808
809</sect1>
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