source: chapter06/systemd.xml@ 70dcd88

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Last change on this file since 70dcd88 was 70dcd88, checked in by Douglas R. Reno <renodr@…>, 5 years ago

Add systemd patch to fix networkd under 5.2+ kernels, as well as issues with RDRAND on AMD Ryzen CPUs

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11648 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 issues with systemd-networkd on Linux 5.2+
44 kernels, as well as with AMD Ryzen CPUs:</para>
45
46<screen><userinput remap="pre">patch -Np1 -i ../systemd-&systemd-version;-networkd_and_rdrand_fixes-1.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<!-- EDITORS NOTE: At the next systemd release, see if the CFLAGS can be removed. -->
74
75 <para>Prepare systemd for compilation:</para>
76
77<screen><userinput remap="configure">mkdir -p build
78cd build
79
80PKG_CONFIG_PATH="/usr/lib/pkgconfig:/tools/lib/pkgconfig" \
81LANG=en_US.UTF-8 \
82CFLAGS+="-Wno-format-overflow" \
83meson --prefix=/usr \
84 --sysconfdir=/etc \
85 --localstatedir=/var \
86 -Dblkid=true \
87 -Dbuildtype=release \
88 -Ddefault-dnssec=no \
89 -Dfirstboot=false \
90 -Dinstall-tests=false \
91 -Dkmod-path=/bin/kmod \
92 -Dldconfig=false \
93 -Dmount-path=/bin/mount \
94 -Drootprefix= \
95 -Drootlibdir=/lib \
96 -Dsplit-usr=true \
97 -Dsulogin-path=/sbin/sulogin \
98 -Dsysusers=false \
99 -Dumount-path=/bin/umount \
100 -Db_lto=false \
101 -Drpmmacrosdir=no \
102 ..</userinput></screen>
103
104 <variablelist>
105 <title>The meaning of the meson options:</title>
106
107 <varlistentry>
108 <term><parameter>-D*-path=*</parameter></term>
109 <listitem>
110 <para>These switches provide location of binaries needed by
111 systemd at runtime that have not yet been installed, or who's
112 pkgconfig files are currently only in
113 <filename>/tools/lib/pkgconfig</filename>.</para>
114 </listitem>
115 </varlistentry>
116
117 <varlistentry>
118 <term><parameter>-Ddefault-dnssec=no</parameter></term>
119 <listitem>
120 <para>This switch turns off the experimental DNSSEC support.</para>
121 </listitem>
122 </varlistentry>
123
124 <varlistentry>
125 <term><parameter>-Dfirstboot=false</parameter></term>
126 <listitem>
127 <para>This switch prevents installation of systemd
128 services responsible for setting up the system for
129 the first time. They are not useful for LFS because
130 everything is done manually.</para>
131 </listitem>
132 </varlistentry>
133
134 <varlistentry>
135 <term><parameter>-Dinstall-tests=false</parameter></term>
136 <listitem>
137 <para>This switch prevents installation of the compiled tests.</para>
138 </listitem>
139 </varlistentry>
140
141 <varlistentry>
142 <term><parameter>-Dldconfig=false</parameter></term>
143 <listitem>
144 <para>This switch prevents installation of a systemd unit that runs
145 <command>ldconfig</command> at boot, which is not useful for source
146 distributions such as LFS and makes the boot time longer. Remove it
147 if the described feature is desired.</para>
148 </listitem>
149 </varlistentry>
150
151 <varlistentry>
152 <term><parameter>-Droot*</parameter></term>
153 <listitem>
154 <para>These switches ensure that core programs and
155 shared libraries are installed in the subdirectories
156 of the root partition.</para>
157 </listitem>
158 </varlistentry>
159
160 <varlistentry>
161 <term><parameter>-Dsplit-usr=true</parameter></term>
162 <listitem>
163 <para>This switch ensures that systemd will work on
164 systems where /bin, /lib and /sbin directories are not
165 symlinks to their /usr counterparts.</para>
166 </listitem>
167 </varlistentry>
168
169 <varlistentry>
170 <term><parameter>-Dsysusers=false</parameter></term>
171 <listitem>
172 <para>This switch prevents installation of systemd
173 services responsible for setting up the
174 <filename>/etc/group</filename> and
175 <filename>/etc/passwd</filename> files. Both files
176 were created earlier in this chapter.</para>
177 </listitem>
178 </varlistentry>
179
180 <varlistentry>
181 <term><parameter>-Drpmmacrosdir=no</parameter></term>
182 <listitem>
183 <para>This switch disables installation of RPM Macros
184 for use with systemd because LFS does not support RPM.</para>
185 </listitem>
186 </varlistentry>
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>To test the package, execute the following command:</para>
194
195<screen><userinput remap="test">LANG=en_US.UTF-8 ninja test</userinput></screen>
196-->
197 <para>Install the package:</para>
198
199<screen><userinput remap="install">LANG=en_US.UTF-8 ninja install</userinput></screen>
200
201 <para>Remove an unnecessary symbolic link:</para>
202
203<screen><userinput remap="install">rm -f /usr/bin/xsltproc</userinput></screen>
204
205 <para>Create the <filename>/etc/machine-id</filename> file needed by
206 <command>systemd-journald</command>:</para>
207
208<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
209
210 <para>Remove symbolic links to Util-Linux libraries:</para>
211
212<screen><userinput remap="adjust">rm -fv /usr/lib/lib{blkid,uuid,mount}.so*</userinput></screen>
213
214 <para>Prevent systemd from creating <filename>/run/nologin</filename>
215 to allow unprivileged user logins without
216 <application>systemd-logind</application>:</para>
217
218<screen><userinput remap="adjust">rm -f /usr/lib/tmpfiles.d/systemd-nologin.conf</userinput></screen>
219
220 </sect2>
221
222 <sect2 id="contents-systemd" role="content">
223 <title>Contents of systemd</title>
224
225 <segmentedlist>
226 <segtitle>Installed programs</segtitle>
227 <segtitle>Installed libraries</segtitle>
228 <segtitle>Installed directories</segtitle>
229
230 <seglistitem>
231 <seg>bootctl, busctl, coredumpctl, halt (symlink to systemctl),
232 hostnamectl, init, journalctl, kernel-install, localectl, loginctl,
233 machinectl, networkctl, portablectl, poweroff (symlink to
234 systemctl), reboot (symlink to systemctl), resolvconf (symlink to
235 resolvectl), resolvectl, runlevel (symlink to systemctl), shutdown
236 (symlink to systemctl), systemctl, systemd-analyze,
237 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
238 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
239 systemd-id128, systemd-inhibit, systemd-machine-id-setup,
240 systemd-mount, systemd-notify, systemd-nspawn, systemd-path,
241 systemd-resolve (symlink to resolvectl), systemd-run,
242 systemd-socket-activate, systemd-stdio-bridge, systemd-tmpfiles,
243 systemd-tty-ask-password-agent, systemd-umount (symlink to
244 systemd-mount), telinit (symlink to systemctl), timedatectl, and
245 udevadm</seg>
246 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
247 libnss_resolve.so.2, libnss_systemd.so.2,
248 libsystemd.so, libsystemd-shared-&systemd-version;.so (in /lib/systemd),
249 and libudev.so</seg>
250 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
251 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
252 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
253 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
254 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
255 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
256 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
257 </seglistitem>
258 </segmentedlist>
259
260 <variablelist>
261 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
262 <?dbfo list-presentation="list"?>
263 <?dbhtml list-presentation="table"?>
264
265 <varlistentry id="bootctl">
266 <term><command>bootctl</command></term>
267 <listitem>
268 <para>Used to query the firmware and boot manager settings</para>
269 <indexterm zone="ch-system-systemd bootctl">
270 <primary sortas="b-bootctl">bootctl</primary>
271 </indexterm>
272 </listitem>
273 </varlistentry>
274
275 <varlistentry id="busctl">
276 <term><command>busctl</command></term>
277 <listitem>
278 <para>Used to introspect and monitor the D-Bus bus</para>
279 <indexterm zone="ch-system-systemd busctl">
280 <primary sortas="b-busctl">busctl</primary>
281 </indexterm>
282 </listitem>
283 </varlistentry>
284
285 <varlistentry id="coredumpctl">
286 <term><command>coredumpctl</command></term>
287 <listitem>
288 <para>Used to retrieve coredumps from the systemd journal</para>
289 <indexterm zone="ch-system-systemd coredumpctl">
290 <primary sortas="b-coredumpctl">coredumpctl</primary>
291 </indexterm>
292 </listitem>
293 </varlistentry>
294
295 <varlistentry id="halt">
296 <term><command>halt</command></term>
297 <listitem>
298 <para>Normally invokes <command>shutdown</command> with the
299 <parameter>-h</parameter> option, except when already in run-level 0,
300 then it tells the kernel to halt the system; it notes in the
301 file <filename>/var/log/wtmp</filename> that the system is being
302 brought down</para>
303 <indexterm zone="ch-system-systemd halt">
304 <primary sortas="b-halt">halt</primary>
305 </indexterm>
306 </listitem>
307 </varlistentry>
308
309 <varlistentry id="hostnamectl">
310 <term><command>hostnamectl</command></term>
311 <listitem>
312 <para>Used to query and change the system hostname and related
313 settings</para>
314 <indexterm zone="ch-system-systemd hostnamectl">
315 <primary sortas="b-hostnamectl">hostnamectl</primary>
316 </indexterm>
317 </listitem>
318 </varlistentry>
319
320 <varlistentry id="init">
321 <term><command>init</command></term>
322 <listitem>
323 <para>The first process to be started when the kernel has initialized
324 the hardware which takes over the boot process and starts all
325 processes according to its configuration files</para>
326 <indexterm zone="ch-system-systemd init">
327 <primary sortas="b-init">init</primary>
328 </indexterm>
329 </listitem>
330 </varlistentry>
331
332 <varlistentry id="journalctl">
333 <term><command>journalctl</command></term>
334 <listitem>
335 <para>Used to query the contents of the systemd journal</para>
336 <indexterm zone="ch-system-systemd journalctl">
337 <primary sortas="b-journalctl">journalctl</primary>
338 </indexterm>
339 </listitem>
340 </varlistentry>
341
342 <varlistentry id="kernel-install">
343 <term><command>kernel-install</command></term>
344 <listitem>
345 <para>Used to add and remove kernel and initramfs images to and
346 from /boot</para>
347 <indexterm zone="ch-system-systemd kernel-install">
348 <primary sortas="b-kernel-install">kernel-install</primary>
349 </indexterm>
350 </listitem>
351 </varlistentry>
352
353 <varlistentry id="localectl">
354 <term><command>localectl</command></term>
355 <listitem>
356 <para>Used to query and change the system locale and keyboard layout
357 settings</para>
358 <indexterm zone="ch-system-systemd localectl">
359 <primary sortas="b-localectl">localectl</primary>
360 </indexterm>
361 </listitem>
362 </varlistentry>
363
364 <varlistentry id="loginctl">
365 <term><command>loginctl</command></term>
366 <listitem>
367 <para>Used to introspect and control the state of the systemd Login
368 Manager</para>
369 <indexterm zone="ch-system-systemd loginctl">
370 <primary sortas="b-loginctl">loginctl</primary>
371 </indexterm>
372 </listitem>
373 </varlistentry>
374
375 <varlistentry id="machinectl">
376 <term><command>machinectl</command></term>
377 <listitem>
378 <para>Used to introspect and control the state of the systemd Virtual
379 Machine and Container Registration Manager</para>
380 <indexterm zone="ch-system-systemd machinectl">
381 <primary sortas="b-machinectl">machinectl</primary>
382 </indexterm>
383 </listitem>
384 </varlistentry>
385
386 <varlistentry id="networkctl">
387 <term><command>networkctl</command></term>
388 <listitem>
389 <para>Used to introspect the state of the network links as seen by
390 systemd-networkd</para>
391 <indexterm zone="ch-system-systemd networkctl">
392 <primary sortas="b-networkctl">networkctl</primary>
393 </indexterm>
394 </listitem>
395 </varlistentry>
396
397 <varlistentry id="portablectl">
398 <term><command>portablectl</command></term>
399 <listitem>
400 <para>Used to attach or detach portable services from the local
401 system</para>
402 <indexterm zone="ch-system-systemd portablectl">
403 <primary sortas="b-portablectl">portablectl</primary>
404 </indexterm>
405 </listitem>
406 </varlistentry>
407
408 <varlistentry id="poweroff">
409 <term><command>poweroff</command></term>
410 <listitem>
411 <para>Tells the kernel to halt the system and switch off the computer
412 (see <command>halt</command>)</para>
413 <indexterm zone="ch-system-systemd poweroff">
414 <primary sortas="b-poweroff">poweroff</primary>
415 </indexterm>
416 </listitem>
417 </varlistentry>
418
419 <varlistentry id="reboot">
420 <term><command>reboot</command></term>
421 <listitem>
422 <para>Tells the kernel to reboot the system (see
423 <command>halt</command>)</para>
424 <indexterm zone="ch-system-systemd reboot">
425 <primary sortas="b-reboot">reboot</primary>
426 </indexterm>
427 </listitem>
428 </varlistentry>
429
430 <varlistentry id="resolvconf">
431 <term><command>resolvconf</command></term>
432 <listitem>
433 <para>Register DNS server and domain configuration with
434 <command>systemd-resolved</command></para>
435 <indexterm zone="ch-system-systemd resolvconf">
436 <primary sortas="b-resolvconf">resolvconf</primary>
437 </indexterm>
438 </listitem>
439 </varlistentry>
440
441 <varlistentry id="resolvectl">
442 <term><command>resolvectl</command></term>
443 <listitem>
444 <para>Send control commands to the network name resolution
445 manager, or resolve domain names, IPv4 and IPv6 addresses,
446 DNS records, and services.</para>
447 <indexterm zone="ch-system-systemd resolvectl">
448 <primary sortas="b-resolvectl">resolvectl</primary>
449 </indexterm>
450 </listitem>
451 </varlistentry>
452
453 <varlistentry id="runlevel">
454 <term><command>runlevel</command></term>
455 <listitem>
456 <para>Reports the previous and the current run-level, as noted in the
457 last run-level record in <filename>/var/run/utmp</filename></para>
458 <indexterm zone="ch-system-systemd runlevel">
459 <primary sortas="b-runlevel">runlevel</primary>
460 </indexterm>
461 </listitem>
462 </varlistentry>
463
464 <varlistentry id="shutdown">
465 <term><command>shutdown</command></term>
466 <listitem>
467 <para>Brings the system down in a secure way, signaling all processes
468 and notifying all logged-in users</para>
469 <indexterm zone="ch-system-systemd shutdown">
470 <primary sortas="b-shutdown">shutdown</primary>
471 </indexterm>
472 </listitem>
473 </varlistentry>
474
475 <varlistentry id="systemctl">
476 <term><command>systemctl</command></term>
477 <listitem>
478 <para>Used to introspect and control the state of the systemd system
479 and service manager</para>
480 <indexterm zone="ch-system-systemd systemctl">
481 <primary sortas="b-systemctl">systemctl</primary>
482 </indexterm>
483 </listitem>
484 </varlistentry>
485
486 <varlistentry id="systemd-analyze">
487 <term><command>systemd-analyze</command></term>
488 <listitem>
489 <para>Used to determine system boot-up performance of the current
490 boot</para>
491 <indexterm zone="ch-system-systemd systemd-analyze">
492 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
493 </indexterm>
494 </listitem>
495 </varlistentry>
496
497 <varlistentry id="systemd-ask-password">
498 <term><command>systemd-ask-password</command></term>
499 <listitem>
500 <para>Used to query a system password or passphrase from the user,
501 using a question message specified on the command line</para>
502 <indexterm zone="ch-system-systemd systemd-ask-password">
503 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
504 </indexterm>
505 </listitem>
506 </varlistentry>
507
508 <varlistentry id="systemd-cat">
509 <term><command>systemd-cat</command></term>
510 <listitem>
511 <para>Used to connect STDOUT and STDERR of a process with the Journal
512 </para>
513 <indexterm zone="ch-system-systemd systemd-cat">
514 <primary sortas="b-systemd-cat">systemd-cat</primary>
515 </indexterm>
516 </listitem>
517 </varlistentry>
518
519 <varlistentry id="systemd-cgls">
520 <term><command>systemd-cgls</command></term>
521 <listitem>
522 <para>Recursively shows the contents of the selected Linux control
523 group hierarchy in a tree</para>
524 <indexterm zone="ch-system-systemd systemd-cgls">
525 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
526 </indexterm>
527 </listitem>
528 </varlistentry>
529
530 <varlistentry id="systemd-cgtop">
531 <term><command>systemd-cgtop</command></term>
532 <listitem>
533 <para>Shows the top control groups of the local Linux control group
534 hierarchy, ordered by their CPU, memory and disk I/O load</para>
535 <indexterm zone="ch-system-systemd systemd-cgtop">
536 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
537 </indexterm>
538 </listitem>
539 </varlistentry>
540
541 <varlistentry id="systemd-delta">
542 <term><command>systemd-delta</command></term>
543 <listitem>
544 <para>Used to identify and compare configuration files in
545 <filename class="directory">/etc</filename> that override default
546 counterparts in <filename class="directory">/usr</filename></para>
547 <indexterm zone="ch-system-systemd systemd-delta">
548 <primary sortas="b-systemd-delta">systemd-delta</primary>
549 </indexterm>
550 </listitem>
551 </varlistentry>
552
553 <varlistentry id="systemd-detect-virt">
554 <term><command>systemd-detect-virt</command></term>
555 <listitem>
556 <para>Detects execution in a virtualized environment</para>
557 <indexterm zone="ch-system-systemd systemd-detect-virt">
558 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
559 </indexterm>
560 </listitem>
561 </varlistentry>
562
563 <varlistentry id="systemd-escape">
564 <term><command>systemd-escape</command></term>
565 <listitem>
566 <para>Used to escape strings for inclusion in systemd unit
567 names</para>
568 <indexterm zone="ch-system-systemd systemd-escape">
569 <primary sortas="b-systemd-escape">systemd-escape</primary>
570 </indexterm>
571 </listitem>
572 </varlistentry>
573
574 <varlistentry id="systemd-hwdb">
575 <term><command>systemd-hwdb</command></term>
576 <listitem>
577 <para>Used to manage hardware database (hwdb)</para>
578 <indexterm zone="ch-system-systemd systemd-hwdb">
579 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
580 </indexterm>
581 </listitem>
582 </varlistentry>
583
584 <varlistentry id="systemd-id128">
585 <term><command>systemd-id128</command></term>
586 <listitem>
587 <para>Generate and print id128 strings</para>
588 <indexterm zone="ch-system-systemd systemd-id128">
589 <primary sortas="b-systemd-id128">systemd-id128</primary>
590 </indexterm>
591 </listitem>
592 </varlistentry>
593
594 <varlistentry id="systemd-inhibit">
595 <term><command>systemd-inhibit</command></term>
596 <listitem>
597 <para>Used to execute a program with a shutdown, sleep or idle
598 inhibitor lock taken</para>
599 <indexterm zone="ch-system-systemd systemd-inhibit">
600 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
601 </indexterm>
602 </listitem>
603 </varlistentry>
604
605 <varlistentry id="systemd-machine-id-setup">
606 <term><command>systemd-machine-id-setup</command></term>
607 <listitem>
608 <para>Used by system installer tools to initialize the machine ID
609 stored in <filename>/etc/machine-id</filename> at install time with a
610 randomly generated ID</para>
611 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
612 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
613 </indexterm>
614 </listitem>
615 </varlistentry>
616
617 <varlistentry id="systemd-mount">
618 <term><command>systemd-mount</command></term>
619 <listitem>
620 <para>A tool to temporarily mount or auto-mount a drive.</para>
621 <indexterm zone="ch-system-systemd systemd-mount">
622 <primary sortas="b-systemd-mount">systemd-mount</primary>
623 </indexterm>
624 </listitem>
625 </varlistentry>
626
627 <varlistentry id="systemd-notify">
628 <term><command>systemd-notify</command></term>
629 <listitem>
630 <para>Used by daemon scripts to notify the init system about status
631 changes</para>
632 <indexterm zone="ch-system-systemd systemd-notify">
633 <primary sortas="b-systemd-notify">systemd-notify</primary>
634 </indexterm>
635 </listitem>
636 </varlistentry>
637
638 <varlistentry id="systemd-nspawn">
639 <term><command>systemd-nspawn</command></term>
640 <listitem>
641 <para>Used to run a command or OS in a light-weight namespace
642 container</para>
643 <indexterm zone="ch-system-systemd systemd-nspawn">
644 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
645 </indexterm>
646 </listitem>
647 </varlistentry>
648
649 <varlistentry id="systemd-path">
650 <term><command>systemd-path</command></term>
651 <listitem>
652 <para>Used to query system and user paths</para>
653 <indexterm zone="ch-system-systemd systemd-path">
654 <primary sortas="b-systemd-path">systemd-path</primary>
655 </indexterm>
656 </listitem>
657 </varlistentry>
658
659 <varlistentry id="systemd-resolve">
660 <term><command>systemd-resolve</command></term>
661 <listitem>
662 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
663 resource records, and services</para>
664 <indexterm zone="ch-system-systemd systemd-resolve">
665 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
666 </indexterm>
667 </listitem>
668 </varlistentry>
669
670 <varlistentry id="systemd-run">
671 <term><command>systemd-run</command></term>
672 <listitem>
673 <para>Used to create and start a transient .service or a .scope unit
674 and run the specified command in it</para>
675 <indexterm zone="ch-system-systemd systemd-run">
676 <primary sortas="b-systemd-run">systemd-run</primary>
677 </indexterm>
678 </listitem>
679 </varlistentry>
680
681 <!-- <varlistentry id="systemd-stdio-bridge">
682 <term><command>systemd-stdio-bridge</command></term>
683 <listitem>
684 <para>To be completed</para>
685 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
686 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
687 </indexterm>
688 </listitem>
689 </varlistentry> -->
690
691 <varlistentry id="systemd-socket-activate">
692 <term><command>systemd-socket-activate</command></term>
693 <listitem>
694 <para>A tool to listen on socket devices and launch a process upon
695 connection.</para>
696 <indexterm zone="ch-system-systemd systemd-socket-activate">
697 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
698 </indexterm>
699 </listitem>
700 </varlistentry>
701
702 <varlistentry id="systemd-tmpfiles">
703 <term><command>systemd-tmpfiles</command></term>
704 <listitem>
705 <para>Creates, deletes and cleans up volatile and temporary files and
706 directories, based on the configuration file format and location
707 specified in
708 <filename class="directory">tmpfiles.d</filename> directories</para>
709 <indexterm zone="ch-system-systemd systemd-tmpfiles">
710 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
711 </indexterm>
712 </listitem>
713 </varlistentry>
714
715 <varlistentry id="systemd-umount">
716 <term><command>systemd-umount</command></term>
717 <listitem>
718 <para>Unmount mount points</para>
719 <indexterm zone="ch-system-systemd systemd-umount">
720 <primary sortas="b-systemd-umount">systemd-umount</primary>
721 </indexterm>
722 </listitem>
723 </varlistentry>
724
725 <varlistentry id="systemd-tty-ask-password-agent">
726 <term><command>systemd-tty-ask-password-agent</command></term>
727 <listitem>
728 <para>Used to list or process pending systemd password requests</para>
729 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
730 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
731 </indexterm>
732 </listitem>
733 </varlistentry>
734
735 <varlistentry id="telinit">
736 <term><command>telinit</command></term>
737 <listitem>
738 <para>Tells <command>init</command> which run-level to change
739 to</para>
740 <indexterm zone="ch-system-systemd telinit">
741 <primary sortas="b-telinit">telinit</primary>
742 </indexterm>
743 </listitem>
744 </varlistentry>
745
746 <varlistentry id="timedatectl">
747 <term><command>timedatectl</command></term>
748 <listitem>
749 <para>Used to query and change the system clock and its settings
750 </para>
751 <indexterm zone="ch-system-systemd timedatectl">
752 <primary sortas="b-timedatectl">timedatectl</primary>
753 </indexterm>
754 </listitem>
755 </varlistentry>
756
757 <varlistentry id="udevadm">
758 <term><command>udevadm</command></term>
759 <listitem>
760 <para>Generic udev administration tool: controls the udevd daemon,
761 provides info from the Udev database, monitors uevents, waits for
762 uevents to finish, tests udev configuration, and triggers uevents
763 for a given device</para>
764 <indexterm zone="ch-system-systemd udevadm">
765 <primary sortas="b-udevadm">udevadm</primary>
766 </indexterm>
767 </listitem>
768 </varlistentry>
769
770 <varlistentry id="libsystemd">
771 <term><filename class="libraryfile">libsystemd</filename></term>
772 <listitem>
773 <para>The main systemd utility library</para>
774 <indexterm zone="ch-system-systemd libsystemd">
775 <primary sortas="c-libsystemd">libsystemd</primary>
776 </indexterm>
777 </listitem>
778 </varlistentry>
779
780 <varlistentry id="libudev">
781 <term><filename class="libraryfile">libudev</filename></term>
782 <listitem>
783 <para>A library to access Udev device information</para>
784 <indexterm zone="ch-system-systemd libudev">
785 <primary sortas="c-libudev">libudev</primary>
786 </indexterm>
787 </listitem>
788 </varlistentry>
789
790 </variablelist>
791
792 </sect2>
793
794</sect1>
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