source: chapter06/systemd.xml@ 87b22cad

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Last change on this file since 87b22cad was 87b22cad, checked in by Douglas R. Reno <renodr@…>, 4 years ago

Fix potential problem with meson-0.52 and systemd-243.

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11697 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
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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 <para>Create a symlink to work around missing xsltproc:</para>
49
50<screen><userinput remap="pre">ln -sf /tools/bin/true /usr/bin/xsltproc</userinput></screen>
51
52 <para>Because we have not yet installed the final version of Util-Linux,
53 create links to the libraries in the approprite location:</para>
54
55<screen><userinput remap="pre">for file in /tools/lib/lib{blkid,mount,uuid}.so*; do
56 ln -sf $file /usr/lib/
57done</userinput></screen>
58
59 <para>Set up the man pages:</para>
60
61<screen><userinput remap="pre">tar -xf ../systemd-man-pages-&systemd-version;.tar.xz</userinput></screen>
62
63 <para>Remove tests that cannot be built in chroot:</para>
64
65<screen><userinput remap="pre">sed '177,$ d' -i src/resolve/meson.build</userinput></screen>
66
67 <para>Remove an unneeded group,
68 <systemitem class="groupname">render</systemitem>, from the default udev
69 rules:</para>
70
71<screen><userinput remap="pre">sed -i 's/GROUP="render", //' rules/50-udev-default.rules.in</userinput></screen>
72
73 <para>Prepare systemd for compilation:</para>
74
75<screen><userinput remap="configure">mkdir -p build
76cd build
77
78PKG_CONFIG_PATH="/usr/lib/pkgconfig:/tools/lib/pkgconfig" \
79LANG=en_US.UTF-8 \
80meson --prefix=/usr \
81 --sysconfdir=/etc \
82 --localstatedir=/var \
83 -Dblkid=true \
84 -Dbuildtype=release \
85 -Ddefault-dnssec=no \
86 -Dfirstboot=false \
87 -Dinstall-tests=false \
88 -Dkmod-path=/bin/kmod \
89 -Dldconfig=false \
90 -Dmount-path=/bin/mount \
91 -Drootprefix= \
92 -Drootlibdir=/lib \
93 -Dsplit-usr=true \
94 -Dsulogin-path=/sbin/sulogin \
95 -Dsysusers=false \
96 -Dumount-path=/bin/umount \
97 -Db_lto=false \
98 -Drpmmacrosdir=no \
99 ..</userinput></screen>
100
101 <variablelist>
102 <title>The meaning of the meson options:</title>
103
104 <varlistentry>
105 <term><parameter>-D*-path=*</parameter></term>
106 <listitem>
107 <para>These switches provide location of binaries needed by
108 systemd at runtime that have not yet been installed, or who's
109 pkgconfig files are currently only in
110 <filename>/tools/lib/pkgconfig</filename>.</para>
111 </listitem>
112 </varlistentry>
113
114 <varlistentry>
115 <term><parameter>-Ddefault-dnssec=no</parameter></term>
116 <listitem>
117 <para>This switch turns off the experimental DNSSEC support.</para>
118 </listitem>
119 </varlistentry>
120
121 <varlistentry>
122 <term><parameter>-Dfirstboot=false</parameter></term>
123 <listitem>
124 <para>This switch prevents installation of systemd
125 services responsible for setting up the system for
126 the first time. They are not useful for LFS because
127 everything is done manually.</para>
128 </listitem>
129 </varlistentry>
130
131 <varlistentry>
132 <term><parameter>-Dinstall-tests=false</parameter></term>
133 <listitem>
134 <para>This switch prevents installation of the compiled tests.</para>
135 </listitem>
136 </varlistentry>
137
138 <varlistentry>
139 <term><parameter>-Dldconfig=false</parameter></term>
140 <listitem>
141 <para>This switch prevents installation of a systemd unit that runs
142 <command>ldconfig</command> at boot, which is not useful for source
143 distributions such as LFS and makes the boot time longer. Remove it
144 if the described feature is desired.</para>
145 </listitem>
146 </varlistentry>
147
148 <varlistentry>
149 <term><parameter>-Droot*</parameter></term>
150 <listitem>
151 <para>These switches ensure that core programs and
152 shared libraries are installed in the subdirectories
153 of the root partition.</para>
154 </listitem>
155 </varlistentry>
156
157 <varlistentry>
158 <term><parameter>-Dsplit-usr=true</parameter></term>
159 <listitem>
160 <para>This switch ensures that systemd will work on
161 systems where /bin, /lib and /sbin directories are not
162 symlinks to their /usr counterparts.</para>
163 </listitem>
164 </varlistentry>
165
166 <varlistentry>
167 <term><parameter>-Dsysusers=false</parameter></term>
168 <listitem>
169 <para>This switch prevents installation of systemd
170 services responsible for setting up the
171 <filename>/etc/group</filename> and
172 <filename>/etc/passwd</filename> files. Both files
173 were created earlier in this chapter.</para>
174 </listitem>
175 </varlistentry>
176
177 <varlistentry>
178 <term><parameter>-Drpmmacrosdir=no</parameter></term>
179 <listitem>
180 <para>This switch disables installation of RPM Macros
181 for use with systemd because LFS does not support RPM.</para>
182 </listitem>
183 </varlistentry>
184 </variablelist>
185
186 <para>Compile the package:</para>
187
188<screen><userinput remap="make">LANG=en_US.UTF-8 ninja</userinput></screen>
189<!--
190 <para>To test the package, execute the following command:</para>
191
192<screen><userinput remap="test">LANG=en_US.UTF-8 ninja test</userinput></screen>
193-->
194 <para>Install the package:</para>
195
196<screen><userinput remap="install">LANG=en_US.UTF-8 ninja install</userinput></screen>
197
198 <para>Remove an unnecessary symbolic link:</para>
199
200<screen><userinput remap="install">rm -f /usr/bin/xsltproc</userinput></screen>
201
202 <para>Create the <filename>/etc/machine-id</filename> file needed by
203 <command>systemd-journald</command>:</para>
204
205<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
206
207 <para>Setup the basic target structure:</para>
208
209<screen><userinput remap="adjust">systemctl preset-all</userinput></screen>
210
211 <para>Disable a service that is known to cause problems with systems that
212 use a network configuration other than what is provided by
213 systemd-networkd:</para>
214 <!-- Observed halting startup with dhcpcd handling the primary NIC -->
215
216<screen><userinput remap="adjust">systemctl disable systemd-time-wait-sync.service</userinput></screen>
217
218 <para>Prevent systemd from resetting the maximum PID value which causes
219 some problems with packages and units in BLFS:</para>
220 <!-- FCRON in particular -->
221
222<screen><userinput remap="adjust">rm -f /etc/sysctl.d/50-pid-max.conf</userinput></screen>
223
224 <para>Cleanup symbolic links to Util-Linux libraries:</para>
225
226<screen><userinput remap="adjust">rm -fv /usr/lib/lib{blkid,uuid,mount}.so*</userinput></screen>
227
228 <para>Prevent systemd from creating <filename>/run/nologin</filename>
229 to allow unprivileged user logins without
230 <application>systemd-logind</application>:</para>
231
232<screen><userinput remap="adjust">rm -f /usr/lib/tmpfiles.d/systemd-nologin.conf</userinput></screen>
233
234 </sect2>
235
236 <sect2 id="contents-systemd" role="content">
237 <title>Contents of systemd</title>
238
239 <segmentedlist>
240 <segtitle>Installed programs</segtitle>
241 <segtitle>Installed libraries</segtitle>
242 <segtitle>Installed directories</segtitle>
243
244 <seglistitem>
245 <seg>bootctl, busctl, coredumpctl, halt (symlink to systemctl),
246 hostnamectl, init, journalctl, kernel-install, localectl, loginctl,
247 machinectl, networkctl, portablectl, poweroff (symlink to
248 systemctl), reboot (symlink to systemctl), resolvconf (symlink to
249 resolvectl), resolvectl, runlevel (symlink to systemctl), shutdown
250 (symlink to systemctl), systemctl, systemd-analyze,
251 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
252 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
253 systemd-id128, systemd-inhibit, systemd-machine-id-setup,
254 systemd-mount, systemd-notify, systemd-nspawn, systemd-path,
255 systemd-resolve (symlink to resolvectl), systemd-run,
256 systemd-socket-activate, systemd-stdio-bridge, systemd-tmpfiles,
257 systemd-tty-ask-password-agent, systemd-umount (symlink to
258 systemd-mount), telinit (symlink to systemctl), timedatectl, and
259 udevadm</seg>
260 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
261 libnss_resolve.so.2, libnss_systemd.so.2,
262 libsystemd.so, libsystemd-shared-&systemd-version;.so (in /lib/systemd),
263 and libudev.so</seg>
264 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
265 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
266 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
267 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
268 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
269 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
270 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
271 </seglistitem>
272 </segmentedlist>
273
274 <variablelist>
275 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
276 <?dbfo list-presentation="list"?>
277 <?dbhtml list-presentation="table"?>
278
279 <varlistentry id="bootctl">
280 <term><command>bootctl</command></term>
281 <listitem>
282 <para>Used to query the firmware and boot manager settings</para>
283 <indexterm zone="ch-system-systemd bootctl">
284 <primary sortas="b-bootctl">bootctl</primary>
285 </indexterm>
286 </listitem>
287 </varlistentry>
288
289 <varlistentry id="busctl">
290 <term><command>busctl</command></term>
291 <listitem>
292 <para>Used to introspect and monitor the D-Bus bus</para>
293 <indexterm zone="ch-system-systemd busctl">
294 <primary sortas="b-busctl">busctl</primary>
295 </indexterm>
296 </listitem>
297 </varlistentry>
298
299 <varlistentry id="coredumpctl">
300 <term><command>coredumpctl</command></term>
301 <listitem>
302 <para>Used to retrieve coredumps from the systemd journal</para>
303 <indexterm zone="ch-system-systemd coredumpctl">
304 <primary sortas="b-coredumpctl">coredumpctl</primary>
305 </indexterm>
306 </listitem>
307 </varlistentry>
308
309 <varlistentry id="halt">
310 <term><command>halt</command></term>
311 <listitem>
312 <para>Normally invokes <command>shutdown</command> with the
313 <parameter>-h</parameter> option, except when already in run-level 0,
314 then it tells the kernel to halt the system; it notes in the
315 file <filename>/var/log/wtmp</filename> that the system is being
316 brought down</para>
317 <indexterm zone="ch-system-systemd halt">
318 <primary sortas="b-halt">halt</primary>
319 </indexterm>
320 </listitem>
321 </varlistentry>
322
323 <varlistentry id="hostnamectl">
324 <term><command>hostnamectl</command></term>
325 <listitem>
326 <para>Used to query and change the system hostname and related
327 settings</para>
328 <indexterm zone="ch-system-systemd hostnamectl">
329 <primary sortas="b-hostnamectl">hostnamectl</primary>
330 </indexterm>
331 </listitem>
332 </varlistentry>
333
334 <varlistentry id="init">
335 <term><command>init</command></term>
336 <listitem>
337 <para>The first process to be started when the kernel has initialized
338 the hardware which takes over the boot process and starts all
339 processes according to its configuration files</para>
340 <indexterm zone="ch-system-systemd init">
341 <primary sortas="b-init">init</primary>
342 </indexterm>
343 </listitem>
344 </varlistentry>
345
346 <varlistentry id="journalctl">
347 <term><command>journalctl</command></term>
348 <listitem>
349 <para>Used to query the contents of the systemd journal</para>
350 <indexterm zone="ch-system-systemd journalctl">
351 <primary sortas="b-journalctl">journalctl</primary>
352 </indexterm>
353 </listitem>
354 </varlistentry>
355
356 <varlistentry id="kernel-install">
357 <term><command>kernel-install</command></term>
358 <listitem>
359 <para>Used to add and remove kernel and initramfs images to and
360 from /boot</para>
361 <indexterm zone="ch-system-systemd kernel-install">
362 <primary sortas="b-kernel-install">kernel-install</primary>
363 </indexterm>
364 </listitem>
365 </varlistentry>
366
367 <varlistentry id="localectl">
368 <term><command>localectl</command></term>
369 <listitem>
370 <para>Used to query and change the system locale and keyboard layout
371 settings</para>
372 <indexterm zone="ch-system-systemd localectl">
373 <primary sortas="b-localectl">localectl</primary>
374 </indexterm>
375 </listitem>
376 </varlistentry>
377
378 <varlistentry id="loginctl">
379 <term><command>loginctl</command></term>
380 <listitem>
381 <para>Used to introspect and control the state of the systemd Login
382 Manager</para>
383 <indexterm zone="ch-system-systemd loginctl">
384 <primary sortas="b-loginctl">loginctl</primary>
385 </indexterm>
386 </listitem>
387 </varlistentry>
388
389 <varlistentry id="machinectl">
390 <term><command>machinectl</command></term>
391 <listitem>
392 <para>Used to introspect and control the state of the systemd Virtual
393 Machine and Container Registration Manager</para>
394 <indexterm zone="ch-system-systemd machinectl">
395 <primary sortas="b-machinectl">machinectl</primary>
396 </indexterm>
397 </listitem>
398 </varlistentry>
399
400 <varlistentry id="networkctl">
401 <term><command>networkctl</command></term>
402 <listitem>
403 <para>Used to introspect the state of the network links as seen by
404 systemd-networkd</para>
405 <indexterm zone="ch-system-systemd networkctl">
406 <primary sortas="b-networkctl">networkctl</primary>
407 </indexterm>
408 </listitem>
409 </varlistentry>
410
411 <varlistentry id="portablectl">
412 <term><command>portablectl</command></term>
413 <listitem>
414 <para>Used to attach or detach portable services from the local
415 system</para>
416 <indexterm zone="ch-system-systemd portablectl">
417 <primary sortas="b-portablectl">portablectl</primary>
418 </indexterm>
419 </listitem>
420 </varlistentry>
421
422 <varlistentry id="poweroff">
423 <term><command>poweroff</command></term>
424 <listitem>
425 <para>Tells the kernel to halt the system and switch off the computer
426 (see <command>halt</command>)</para>
427 <indexterm zone="ch-system-systemd poweroff">
428 <primary sortas="b-poweroff">poweroff</primary>
429 </indexterm>
430 </listitem>
431 </varlistentry>
432
433 <varlistentry id="reboot">
434 <term><command>reboot</command></term>
435 <listitem>
436 <para>Tells the kernel to reboot the system (see
437 <command>halt</command>)</para>
438 <indexterm zone="ch-system-systemd reboot">
439 <primary sortas="b-reboot">reboot</primary>
440 </indexterm>
441 </listitem>
442 </varlistentry>
443
444 <varlistentry id="resolvconf">
445 <term><command>resolvconf</command></term>
446 <listitem>
447 <para>Register DNS server and domain configuration with
448 <command>systemd-resolved</command></para>
449 <indexterm zone="ch-system-systemd resolvconf">
450 <primary sortas="b-resolvconf">resolvconf</primary>
451 </indexterm>
452 </listitem>
453 </varlistentry>
454
455 <varlistentry id="resolvectl">
456 <term><command>resolvectl</command></term>
457 <listitem>
458 <para>Send control commands to the network name resolution
459 manager, or resolve domain names, IPv4 and IPv6 addresses,
460 DNS records, and services.</para>
461 <indexterm zone="ch-system-systemd resolvectl">
462 <primary sortas="b-resolvectl">resolvectl</primary>
463 </indexterm>
464 </listitem>
465 </varlistentry>
466
467 <varlistentry id="runlevel">
468 <term><command>runlevel</command></term>
469 <listitem>
470 <para>Reports the previous and the current run-level, as noted in the
471 last run-level record in <filename>/var/run/utmp</filename></para>
472 <indexterm zone="ch-system-systemd runlevel">
473 <primary sortas="b-runlevel">runlevel</primary>
474 </indexterm>
475 </listitem>
476 </varlistentry>
477
478 <varlistentry id="shutdown">
479 <term><command>shutdown</command></term>
480 <listitem>
481 <para>Brings the system down in a secure way, signaling all processes
482 and notifying all logged-in users</para>
483 <indexterm zone="ch-system-systemd shutdown">
484 <primary sortas="b-shutdown">shutdown</primary>
485 </indexterm>
486 </listitem>
487 </varlistentry>
488
489 <varlistentry id="systemctl">
490 <term><command>systemctl</command></term>
491 <listitem>
492 <para>Used to introspect and control the state of the systemd system
493 and service manager</para>
494 <indexterm zone="ch-system-systemd systemctl">
495 <primary sortas="b-systemctl">systemctl</primary>
496 </indexterm>
497 </listitem>
498 </varlistentry>
499
500 <varlistentry id="systemd-analyze">
501 <term><command>systemd-analyze</command></term>
502 <listitem>
503 <para>Used to determine system boot-up performance of the current
504 boot</para>
505 <indexterm zone="ch-system-systemd systemd-analyze">
506 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
507 </indexterm>
508 </listitem>
509 </varlistentry>
510
511 <varlistentry id="systemd-ask-password">
512 <term><command>systemd-ask-password</command></term>
513 <listitem>
514 <para>Used to query a system password or passphrase from the user,
515 using a question message specified on the command line</para>
516 <indexterm zone="ch-system-systemd systemd-ask-password">
517 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
518 </indexterm>
519 </listitem>
520 </varlistentry>
521
522 <varlistentry id="systemd-cat">
523 <term><command>systemd-cat</command></term>
524 <listitem>
525 <para>Used to connect STDOUT and STDERR of a process with the Journal
526 </para>
527 <indexterm zone="ch-system-systemd systemd-cat">
528 <primary sortas="b-systemd-cat">systemd-cat</primary>
529 </indexterm>
530 </listitem>
531 </varlistentry>
532
533 <varlistentry id="systemd-cgls">
534 <term><command>systemd-cgls</command></term>
535 <listitem>
536 <para>Recursively shows the contents of the selected Linux control
537 group hierarchy in a tree</para>
538 <indexterm zone="ch-system-systemd systemd-cgls">
539 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
540 </indexterm>
541 </listitem>
542 </varlistentry>
543
544 <varlistentry id="systemd-cgtop">
545 <term><command>systemd-cgtop</command></term>
546 <listitem>
547 <para>Shows the top control groups of the local Linux control group
548 hierarchy, ordered by their CPU, memory and disk I/O load</para>
549 <indexterm zone="ch-system-systemd systemd-cgtop">
550 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
551 </indexterm>
552 </listitem>
553 </varlistentry>
554
555 <varlistentry id="systemd-delta">
556 <term><command>systemd-delta</command></term>
557 <listitem>
558 <para>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 execution in a virtualized environment</para>
571 <indexterm zone="ch-system-systemd systemd-detect-virt">
572 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
573 </indexterm>
574 </listitem>
575 </varlistentry>
576
577 <varlistentry id="systemd-escape">
578 <term><command>systemd-escape</command></term>
579 <listitem>
580 <para>Used to escape strings for inclusion in systemd unit
581 names</para>
582 <indexterm zone="ch-system-systemd systemd-escape">
583 <primary sortas="b-systemd-escape">systemd-escape</primary>
584 </indexterm>
585 </listitem>
586 </varlistentry>
587
588 <varlistentry id="systemd-hwdb">
589 <term><command>systemd-hwdb</command></term>
590 <listitem>
591 <para>Used to manage hardware database (hwdb)</para>
592 <indexterm zone="ch-system-systemd systemd-hwdb">
593 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
594 </indexterm>
595 </listitem>
596 </varlistentry>
597
598 <varlistentry id="systemd-id128">
599 <term><command>systemd-id128</command></term>
600 <listitem>
601 <para>Generate and print id128 strings</para>
602 <indexterm zone="ch-system-systemd systemd-id128">
603 <primary sortas="b-systemd-id128">systemd-id128</primary>
604 </indexterm>
605 </listitem>
606 </varlistentry>
607
608 <varlistentry id="systemd-inhibit">
609 <term><command>systemd-inhibit</command></term>
610 <listitem>
611 <para>Used to execute a program with a shutdown, sleep or idle
612 inhibitor lock taken</para>
613 <indexterm zone="ch-system-systemd systemd-inhibit">
614 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
615 </indexterm>
616 </listitem>
617 </varlistentry>
618
619 <varlistentry id="systemd-machine-id-setup">
620 <term><command>systemd-machine-id-setup</command></term>
621 <listitem>
622 <para>Used by system installer tools to initialize the machine ID
623 stored in <filename>/etc/machine-id</filename> at install time with a
624 randomly generated ID</para>
625 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
626 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
627 </indexterm>
628 </listitem>
629 </varlistentry>
630
631 <varlistentry id="systemd-mount">
632 <term><command>systemd-mount</command></term>
633 <listitem>
634 <para>A tool to temporarily mount or auto-mount a drive.</para>
635 <indexterm zone="ch-system-systemd systemd-mount">
636 <primary sortas="b-systemd-mount">systemd-mount</primary>
637 </indexterm>
638 </listitem>
639 </varlistentry>
640
641 <varlistentry id="systemd-notify">
642 <term><command>systemd-notify</command></term>
643 <listitem>
644 <para>Used by daemon scripts to notify the init system about status
645 changes</para>
646 <indexterm zone="ch-system-systemd systemd-notify">
647 <primary sortas="b-systemd-notify">systemd-notify</primary>
648 </indexterm>
649 </listitem>
650 </varlistentry>
651
652 <varlistentry id="systemd-nspawn">
653 <term><command>systemd-nspawn</command></term>
654 <listitem>
655 <para>Used to run a command or OS in a light-weight namespace
656 container</para>
657 <indexterm zone="ch-system-systemd systemd-nspawn">
658 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
659 </indexterm>
660 </listitem>
661 </varlistentry>
662
663 <varlistentry id="systemd-path">
664 <term><command>systemd-path</command></term>
665 <listitem>
666 <para>Used to query system and user paths</para>
667 <indexterm zone="ch-system-systemd systemd-path">
668 <primary sortas="b-systemd-path">systemd-path</primary>
669 </indexterm>
670 </listitem>
671 </varlistentry>
672
673 <varlistentry id="systemd-resolve">
674 <term><command>systemd-resolve</command></term>
675 <listitem>
676 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
677 resource records, and services</para>
678 <indexterm zone="ch-system-systemd systemd-resolve">
679 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
680 </indexterm>
681 </listitem>
682 </varlistentry>
683
684 <varlistentry id="systemd-run">
685 <term><command>systemd-run</command></term>
686 <listitem>
687 <para>Used to create and start a transient .service or a .scope unit
688 and run the specified command in it</para>
689 <indexterm zone="ch-system-systemd systemd-run">
690 <primary sortas="b-systemd-run">systemd-run</primary>
691 </indexterm>
692 </listitem>
693 </varlistentry>
694
695 <!-- <varlistentry id="systemd-stdio-bridge">
696 <term><command>systemd-stdio-bridge</command></term>
697 <listitem>
698 <para>To be completed</para>
699 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
700 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
701 </indexterm>
702 </listitem>
703 </varlistentry> -->
704
705 <varlistentry id="systemd-socket-activate">
706 <term><command>systemd-socket-activate</command></term>
707 <listitem>
708 <para>A tool to listen on socket devices and launch a process upon
709 connection.</para>
710 <indexterm zone="ch-system-systemd systemd-socket-activate">
711 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
712 </indexterm>
713 </listitem>
714 </varlistentry>
715
716 <varlistentry id="systemd-tmpfiles">
717 <term><command>systemd-tmpfiles</command></term>
718 <listitem>
719 <para>Creates, deletes and cleans up volatile and temporary files and
720 directories, based on the configuration file format and location
721 specified in
722 <filename class="directory">tmpfiles.d</filename> directories</para>
723 <indexterm zone="ch-system-systemd systemd-tmpfiles">
724 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
725 </indexterm>
726 </listitem>
727 </varlistentry>
728
729 <varlistentry id="systemd-umount">
730 <term><command>systemd-umount</command></term>
731 <listitem>
732 <para>Unmount mount points</para>
733 <indexterm zone="ch-system-systemd systemd-umount">
734 <primary sortas="b-systemd-umount">systemd-umount</primary>
735 </indexterm>
736 </listitem>
737 </varlistentry>
738
739 <varlistentry id="systemd-tty-ask-password-agent">
740 <term><command>systemd-tty-ask-password-agent</command></term>
741 <listitem>
742 <para>Used to list or process pending systemd password requests</para>
743 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
744 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
745 </indexterm>
746 </listitem>
747 </varlistentry>
748
749 <varlistentry id="telinit">
750 <term><command>telinit</command></term>
751 <listitem>
752 <para>Tells <command>init</command> which run-level to change
753 to</para>
754 <indexterm zone="ch-system-systemd telinit">
755 <primary sortas="b-telinit">telinit</primary>
756 </indexterm>
757 </listitem>
758 </varlistentry>
759
760 <varlistentry id="timedatectl">
761 <term><command>timedatectl</command></term>
762 <listitem>
763 <para>Used to query and change the system clock and its settings
764 </para>
765 <indexterm zone="ch-system-systemd timedatectl">
766 <primary sortas="b-timedatectl">timedatectl</primary>
767 </indexterm>
768 </listitem>
769 </varlistentry>
770
771 <varlistentry id="udevadm">
772 <term><command>udevadm</command></term>
773 <listitem>
774 <para>Generic udev administration tool: controls the udevd daemon,
775 provides info from the Udev database, monitors uevents, waits for
776 uevents to finish, tests udev configuration, and triggers uevents
777 for a given device</para>
778 <indexterm zone="ch-system-systemd udevadm">
779 <primary sortas="b-udevadm">udevadm</primary>
780 </indexterm>
781 </listitem>
782 </varlistentry>
783
784 <varlistentry id="libsystemd">
785 <term><filename class="libraryfile">libsystemd</filename></term>
786 <listitem>
787 <para>The main systemd utility library</para>
788 <indexterm zone="ch-system-systemd libsystemd">
789 <primary sortas="c-libsystemd">libsystemd</primary>
790 </indexterm>
791 </listitem>
792 </varlistentry>
793
794 <varlistentry id="libudev">
795 <term><filename class="libraryfile">libudev</filename></term>
796 <listitem>
797 <para>A library to access Udev device information</para>
798 <indexterm zone="ch-system-systemd libudev">
799 <primary sortas="c-libudev">libudev</primary>
800 </indexterm>
801 </listitem>
802 </varlistentry>
803
804 </variablelist>
805
806 </sect2>
807
808</sect1>
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