source: chapter06/systemd.xml@ d53fefa

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Update to upstream r11895

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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 the build with GCC-10:</para>
44
45<screen><userinput remap="pre">patch -Np1 -i ../systemd-&systemd-version;-gcc_10-fixes-1.patch</userinput></screen>
46
47
48 <para>Create a symlink to work around missing xsltproc:</para>
49
50<screen><userinput remap="pre">ln -sf /bin/true /usr/bin/xsltproc</userinput></screen>
51
52 <para>Set up the man pages:</para>
53
54<screen><userinput remap="pre">tar -xf ../systemd-man-pages-&systemd-version;.tar.xz</userinput></screen>
55
56 <para>Remove tests that cannot be built in chroot:</para>
57
58<screen><userinput remap="pre">sed '179,$ d' -i src/resolve/meson.build</userinput></screen>
59
60 <para>Remove an unneeded group,
61 <systemitem class="groupname">render</systemitem>, from the default udev
62 rules:</para>
63
64<screen><userinput remap="pre">sed -i 's/GROUP="render", //' rules.d/50-udev-default.rules.in</userinput></screen>
65
66 <para>Prepare systemd for compilation:</para>
67
68<screen><userinput remap="configure">mkdir -p build
69cd build
70
71LANG=en_US.UTF-8 \
72meson --prefix=/usr \
73 --sysconfdir=/etc \
74 --localstatedir=/var \
75 -Dblkid=true \
76 -Dbuildtype=release \
77 -Ddefault-dnssec=no \
78 -Dfirstboot=false \
79 -Dinstall-tests=false \
80 -Dkmod-path=/bin/kmod \
81 -Dldconfig=false \
82 -Dmount-path=/bin/mount \
83 -Drootprefix= \
84 -Drootlibdir=/lib \
85 -Dsplit-usr=true \
86 -Dsulogin-path=/sbin/sulogin \
87 -Dsysusers=false \
88 -Dumount-path=/bin/umount \
89 -Db_lto=false \
90 -Drpmmacrosdir=no \
91 -Dhomed=false \
92 -Duserdb=false \
93 -Dman=true \
94 ..</userinput></screen>
95
96 <variablelist>
97 <title>The meaning of the meson options:</title>
98
99<!--
100 <varlistentry>
101 <term><parameter>-Dc_args=-Wno-format-overflow</parameter></term>
102 <listitem>
103 <para>The defaults flags passed to gcc contain
104 <parameter>-Werror=format-overflow</parameter>, which generates
105 an error with GCC 10. Passing this parameter prevents the error
106 from occuring.</para>
107 </listitem>
108 </varlistentry>
109-->
110
111 <varlistentry>
112 <term><parameter>-D*-path=*</parameter></term>
113 <listitem>
114 <para>These switches provide location of binaries needed by
115 systemd at runtime that have not yet been installed.</para>
116 </listitem>
117 </varlistentry>
118
119 <varlistentry>
120 <term><parameter>-Ddefault-dnssec=no</parameter></term>
121 <listitem>
122 <para>This switch turns off the experimental DNSSEC support.</para>
123 </listitem>
124 </varlistentry>
125
126 <varlistentry>
127 <term><parameter>-Dfirstboot=false</parameter></term>
128 <listitem>
129 <para>This switch prevents installation of systemd
130 services responsible for setting up the system for
131 the first time. They are not useful for LFS because
132 everything is done manually.</para>
133 </listitem>
134 </varlistentry>
135
136 <varlistentry>
137 <term><parameter>-Dinstall-tests=false</parameter></term>
138 <listitem>
139 <para>This switch prevents installation of the compiled tests.</para>
140 </listitem>
141 </varlistentry>
142
143 <varlistentry>
144 <term><parameter>-Dldconfig=false</parameter></term>
145 <listitem>
146 <para>This switch prevents installation of a systemd unit that runs
147 <command>ldconfig</command> at boot, which is not useful for source
148 distributions such as LFS and makes the boot time longer. Remove it
149 if the described feature is desired.</para>
150 </listitem>
151 </varlistentry>
152
153 <varlistentry>
154 <term><parameter>-Droot*</parameter></term>
155 <listitem>
156 <para>These switches ensure that core programs and
157 shared libraries are installed in the subdirectories
158 of the root partition.</para>
159 </listitem>
160 </varlistentry>
161
162 <varlistentry>
163 <term><parameter>-Dsplit-usr=true</parameter></term>
164 <listitem>
165 <para>This switch ensures that systemd will work on
166 systems where /bin, /lib and /sbin directories are not
167 symlinks to their /usr counterparts.</para>
168 </listitem>
169 </varlistentry>
170
171 <varlistentry>
172 <term><parameter>-Dsysusers=false</parameter></term>
173 <listitem>
174 <para>This switch prevents installation of systemd
175 services responsible for setting up the
176 <filename>/etc/group</filename> and
177 <filename>/etc/passwd</filename> files. Both files
178 were created earlier in this chapter.</para>
179 </listitem>
180 </varlistentry>
181
182 <varlistentry>
183 <term><parameter>-Drpmmacrosdir=no</parameter></term>
184 <listitem>
185 <para>This switch disables installation of RPM Macros
186 for use with systemd because LFS does not support RPM.</para>
187 </listitem>
188 </varlistentry>
189
190 <varlistentry>
191 <term><parameter>-D{userdb,homed}=false</parameter></term>
192 <listitem>
193 <para>Remove two daemons that have dependencies that do not fit
194 the scope of LFS.</para>
195 </listitem>
196 </varlistentry>
197
198 </variablelist>
199
200 <para>Compile the package:</para>
201
202<screen><userinput remap="make">LANG=en_US.UTF-8 ninja</userinput></screen>
203<!--
204 <para>To test the package, execute the following command:</para>
205
206<screen><userinput remap="test">LANG=en_US.UTF-8 ninja test</userinput></screen>
207-->
208 <para>Install the package:</para>
209
210<screen><userinput remap="install">LANG=en_US.UTF-8 ninja install</userinput></screen>
211
212 <para>Remove an unnecessary symbolic link:</para>
213
214<screen><userinput remap="install">rm -f /usr/bin/xsltproc</userinput></screen>
215
216 <para>Create the <filename>/etc/machine-id</filename> file needed by
217 <command>systemd-journald</command>:</para>
218
219<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
220
221 <para>Setup the basic target structure:</para>
222
223<screen><userinput remap="adjust">systemctl preset-all</userinput></screen>
224
225 <para>Disable a service that is known to cause problems with systems that
226 use a network configuration other than what is provided by
227 systemd-networkd:</para>
228 <!-- Observed halting startup with dhcpcd handling the primary NIC -->
229
230<screen><userinput remap="adjust">systemctl disable systemd-time-wait-sync.service</userinput></screen>
231
232 <para>Prevent systemd from resetting the maximum PID value which causes
233 some problems with packages and units in BLFS:</para>
234
235
236<screen><userinput remap="adjust">rm -f /usr/lib/sysctl.d/50-pid-max.conf</userinput></screen>
237
238 <!--
239 <para>Prevent systemd from creating <filename>/run/nologin</filename>
240 to allow unprivileged user logins without
241 <application>systemd-logind</application>:</para>
242
243<screen><userinput remap="adjust">rm -f /usr/lib/tmpfiles.d/systemd-nologin.conf</userinput></screen>
244 -->
245 </sect2>
246
247 <sect2 id="contents-systemd" role="content">
248 <title>Contents of systemd</title>
249
250 <segmentedlist>
251 <segtitle>Installed programs</segtitle>
252 <segtitle>Installed libraries</segtitle>
253 <segtitle>Installed directories</segtitle>
254
255 <seglistitem>
256 <seg>bootctl, busctl, coredumpctl, halt (symlink to systemctl),
257 hostnamectl, init, journalctl, kernel-install, localectl, loginctl,
258 machinectl, networkctl, portablectl, poweroff (symlink to
259 systemctl), reboot (symlink to systemctl), resolvconf (symlink to
260 resolvectl), resolvectl, runlevel (symlink to systemctl), shutdown
261 (symlink to systemctl), systemctl, systemd-analyze,
262 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
263 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
264 systemd-id128, systemd-inhibit, systemd-machine-id-setup,
265 systemd-mount, systemd-notify, systemd-nspawn, systemd-path,
266 systemd-repart, systemd-resolve (symlink to resolvectl), systemd-run,
267 systemd-socket-activate, systemd-stdio-bridge, systemd-tmpfiles,
268 systemd-tty-ask-password-agent, systemd-umount (symlink to
269 systemd-mount), telinit (symlink to systemctl), timedatectl, and
270 udevadm</seg>
271 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
272 libnss_resolve.so.2, libnss_systemd.so.2,
273 libsystemd.so, libsystemd-shared-&systemd-version;.so (in /lib/systemd),
274 and libudev.so</seg>
275 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
276 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
277 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
278 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
279 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
280 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
281 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
282 </seglistitem>
283 </segmentedlist>
284
285 <variablelist>
286 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
287 <?dbfo list-presentation="list"?>
288 <?dbhtml list-presentation="table"?>
289
290 <varlistentry id="bootctl">
291 <term><command>bootctl</command></term>
292 <listitem>
293 <para>Used to query the firmware and boot manager settings</para>
294 <indexterm zone="ch-system-systemd bootctl">
295 <primary sortas="b-bootctl">bootctl</primary>
296 </indexterm>
297 </listitem>
298 </varlistentry>
299
300 <varlistentry id="busctl">
301 <term><command>busctl</command></term>
302 <listitem>
303 <para>Used to introspect and monitor the D-Bus bus</para>
304 <indexterm zone="ch-system-systemd busctl">
305 <primary sortas="b-busctl">busctl</primary>
306 </indexterm>
307 </listitem>
308 </varlistentry>
309
310 <varlistentry id="coredumpctl">
311 <term><command>coredumpctl</command></term>
312 <listitem>
313 <para>Used to retrieve coredumps from the systemd journal</para>
314 <indexterm zone="ch-system-systemd coredumpctl">
315 <primary sortas="b-coredumpctl">coredumpctl</primary>
316 </indexterm>
317 </listitem>
318 </varlistentry>
319
320 <varlistentry id="halt">
321 <term><command>halt</command></term>
322 <listitem>
323 <para>Normally invokes <command>shutdown</command> with the
324 <parameter>-h</parameter> option, except when already in run-level 0,
325 then it tells the kernel to halt the system; it notes in the
326 file <filename>/var/log/wtmp</filename> that the system is being
327 brought down</para>
328 <indexterm zone="ch-system-systemd halt">
329 <primary sortas="b-halt">halt</primary>
330 </indexterm>
331 </listitem>
332 </varlistentry>
333
334 <varlistentry id="hostnamectl">
335 <term><command>hostnamectl</command></term>
336 <listitem>
337 <para>Used to query and change the system hostname and related
338 settings</para>
339 <indexterm zone="ch-system-systemd hostnamectl">
340 <primary sortas="b-hostnamectl">hostnamectl</primary>
341 </indexterm>
342 </listitem>
343 </varlistentry>
344
345 <varlistentry id="init">
346 <term><command>init</command></term>
347 <listitem>
348 <para>The first process to be started when the kernel has initialized
349 the hardware which takes over the boot process and starts all
350 processes according to its configuration files</para>
351 <indexterm zone="ch-system-systemd init">
352 <primary sortas="b-init">init</primary>
353 </indexterm>
354 </listitem>
355 </varlistentry>
356
357 <varlistentry id="journalctl">
358 <term><command>journalctl</command></term>
359 <listitem>
360 <para>Used to query the contents of the systemd journal</para>
361 <indexterm zone="ch-system-systemd journalctl">
362 <primary sortas="b-journalctl">journalctl</primary>
363 </indexterm>
364 </listitem>
365 </varlistentry>
366
367 <varlistentry id="kernel-install">
368 <term><command>kernel-install</command></term>
369 <listitem>
370 <para>Used to add and remove kernel and initramfs images to and
371 from /boot</para>
372 <indexterm zone="ch-system-systemd kernel-install">
373 <primary sortas="b-kernel-install">kernel-install</primary>
374 </indexterm>
375 </listitem>
376 </varlistentry>
377
378 <varlistentry id="localectl">
379 <term><command>localectl</command></term>
380 <listitem>
381 <para>Used to query and change the system locale and keyboard layout
382 settings</para>
383 <indexterm zone="ch-system-systemd localectl">
384 <primary sortas="b-localectl">localectl</primary>
385 </indexterm>
386 </listitem>
387 </varlistentry>
388
389 <varlistentry id="loginctl">
390 <term><command>loginctl</command></term>
391 <listitem>
392 <para>Used to introspect and control the state of the systemd Login
393 Manager</para>
394 <indexterm zone="ch-system-systemd loginctl">
395 <primary sortas="b-loginctl">loginctl</primary>
396 </indexterm>
397 </listitem>
398 </varlistentry>
399
400 <varlistentry id="machinectl">
401 <term><command>machinectl</command></term>
402 <listitem>
403 <para>Used to introspect and control the state of the systemd Virtual
404 Machine and Container Registration Manager</para>
405 <indexterm zone="ch-system-systemd machinectl">
406 <primary sortas="b-machinectl">machinectl</primary>
407 </indexterm>
408 </listitem>
409 </varlistentry>
410
411 <varlistentry id="networkctl">
412 <term><command>networkctl</command></term>
413 <listitem>
414 <para>Used to introspect the state of the network links as seen by
415 systemd-networkd</para>
416 <indexterm zone="ch-system-systemd networkctl">
417 <primary sortas="b-networkctl">networkctl</primary>
418 </indexterm>
419 </listitem>
420 </varlistentry>
421
422 <varlistentry id="portablectl">
423 <term><command>portablectl</command></term>
424 <listitem>
425 <para>Used to attach or detach portable services from the local
426 system</para>
427 <indexterm zone="ch-system-systemd portablectl">
428 <primary sortas="b-portablectl">portablectl</primary>
429 </indexterm>
430 </listitem>
431 </varlistentry>
432
433 <varlistentry id="poweroff">
434 <term><command>poweroff</command></term>
435 <listitem>
436 <para>Tells the kernel to halt the system and switch off the computer
437 (see <command>halt</command>)</para>
438 <indexterm zone="ch-system-systemd poweroff">
439 <primary sortas="b-poweroff">poweroff</primary>
440 </indexterm>
441 </listitem>
442 </varlistentry>
443
444 <varlistentry id="reboot">
445 <term><command>reboot</command></term>
446 <listitem>
447 <para>Tells the kernel to reboot the system (see
448 <command>halt</command>)</para>
449 <indexterm zone="ch-system-systemd reboot">
450 <primary sortas="b-reboot">reboot</primary>
451 </indexterm>
452 </listitem>
453 </varlistentry>
454
455 <varlistentry id="resolvconf">
456 <term><command>resolvconf</command></term>
457 <listitem>
458 <para>Register DNS server and domain configuration with
459 <command>systemd-resolved</command></para>
460 <indexterm zone="ch-system-systemd resolvconf">
461 <primary sortas="b-resolvconf">resolvconf</primary>
462 </indexterm>
463 </listitem>
464 </varlistentry>
465
466 <varlistentry id="resolvectl">
467 <term><command>resolvectl</command></term>
468 <listitem>
469 <para>Send control commands to the network name resolution
470 manager, or resolve domain names, IPv4 and IPv6 addresses,
471 DNS records, and services.</para>
472 <indexterm zone="ch-system-systemd resolvectl">
473 <primary sortas="b-resolvectl">resolvectl</primary>
474 </indexterm>
475 </listitem>
476 </varlistentry>
477
478 <varlistentry id="runlevel">
479 <term><command>runlevel</command></term>
480 <listitem>
481 <para>Reports the previous and the current run-level, as noted in the
482 last run-level record in <filename>/var/run/utmp</filename></para>
483 <indexterm zone="ch-system-systemd runlevel">
484 <primary sortas="b-runlevel">runlevel</primary>
485 </indexterm>
486 </listitem>
487 </varlistentry>
488
489 <varlistentry id="shutdown">
490 <term><command>shutdown</command></term>
491 <listitem>
492 <para>Brings the system down in a secure way, signaling all processes
493 and notifying all logged-in users</para>
494 <indexterm zone="ch-system-systemd shutdown">
495 <primary sortas="b-shutdown">shutdown</primary>
496 </indexterm>
497 </listitem>
498 </varlistentry>
499
500 <varlistentry id="systemctl">
501 <term><command>systemctl</command></term>
502 <listitem>
503 <para>Used to introspect and control the state of the systemd system
504 and service manager</para>
505 <indexterm zone="ch-system-systemd systemctl">
506 <primary sortas="b-systemctl">systemctl</primary>
507 </indexterm>
508 </listitem>
509 </varlistentry>
510
511 <varlistentry id="systemd-analyze">
512 <term><command>systemd-analyze</command></term>
513 <listitem>
514 <para>Used to determine system boot-up performance of the current
515 boot</para>
516 <indexterm zone="ch-system-systemd systemd-analyze">
517 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
518 </indexterm>
519 </listitem>
520 </varlistentry>
521
522 <varlistentry id="systemd-ask-password">
523 <term><command>systemd-ask-password</command></term>
524 <listitem>
525 <para>Used to query a system password or passphrase from the user,
526 using a question message specified on the command line</para>
527 <indexterm zone="ch-system-systemd systemd-ask-password">
528 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
529 </indexterm>
530 </listitem>
531 </varlistentry>
532
533 <varlistentry id="systemd-cat">
534 <term><command>systemd-cat</command></term>
535 <listitem>
536 <para>Used to connect STDOUT and STDERR of a process with the Journal
537 </para>
538 <indexterm zone="ch-system-systemd systemd-cat">
539 <primary sortas="b-systemd-cat">systemd-cat</primary>
540 </indexterm>
541 </listitem>
542 </varlistentry>
543
544 <varlistentry id="systemd-cgls">
545 <term><command>systemd-cgls</command></term>
546 <listitem>
547 <para>Recursively shows the contents of the selected Linux control
548 group hierarchy in a tree</para>
549 <indexterm zone="ch-system-systemd systemd-cgls">
550 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
551 </indexterm>
552 </listitem>
553 </varlistentry>
554
555 <varlistentry id="systemd-cgtop">
556 <term><command>systemd-cgtop</command></term>
557 <listitem>
558 <para>Shows the top control groups of the local Linux control group
559 hierarchy, ordered by their CPU, memory and disk I/O load</para>
560 <indexterm zone="ch-system-systemd systemd-cgtop">
561 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
562 </indexterm>
563 </listitem>
564 </varlistentry>
565
566 <varlistentry id="systemd-delta">
567 <term><command>systemd-delta</command></term>
568 <listitem>
569 <para>Used to identify and compare configuration files in
570 <filename class="directory">/etc</filename> that override default
571 counterparts in <filename class="directory">/usr</filename></para>
572 <indexterm zone="ch-system-systemd systemd-delta">
573 <primary sortas="b-systemd-delta">systemd-delta</primary>
574 </indexterm>
575 </listitem>
576 </varlistentry>
577
578 <varlistentry id="systemd-detect-virt">
579 <term><command>systemd-detect-virt</command></term>
580 <listitem>
581 <para>Detects execution in a virtualized environment</para>
582 <indexterm zone="ch-system-systemd systemd-detect-virt">
583 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
584 </indexterm>
585 </listitem>
586 </varlistentry>
587
588 <varlistentry id="systemd-escape">
589 <term><command>systemd-escape</command></term>
590 <listitem>
591 <para>Used to escape strings for inclusion in systemd unit
592 names</para>
593 <indexterm zone="ch-system-systemd systemd-escape">
594 <primary sortas="b-systemd-escape">systemd-escape</primary>
595 </indexterm>
596 </listitem>
597 </varlistentry>
598
599 <varlistentry id="systemd-hwdb">
600 <term><command>systemd-hwdb</command></term>
601 <listitem>
602 <para>Used to manage hardware database (hwdb)</para>
603 <indexterm zone="ch-system-systemd systemd-hwdb">
604 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
605 </indexterm>
606 </listitem>
607 </varlistentry>
608
609 <varlistentry id="systemd-id128">
610 <term><command>systemd-id128</command></term>
611 <listitem>
612 <para>Generate and print id128 strings</para>
613 <indexterm zone="ch-system-systemd systemd-id128">
614 <primary sortas="b-systemd-id128">systemd-id128</primary>
615 </indexterm>
616 </listitem>
617 </varlistentry>
618
619 <varlistentry id="systemd-inhibit">
620 <term><command>systemd-inhibit</command></term>
621 <listitem>
622 <para>Used to execute a program with a shutdown, sleep or idle
623 inhibitor lock taken</para>
624 <indexterm zone="ch-system-systemd systemd-inhibit">
625 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
626 </indexterm>
627 </listitem>
628 </varlistentry>
629
630 <varlistentry id="systemd-machine-id-setup">
631 <term><command>systemd-machine-id-setup</command></term>
632 <listitem>
633 <para>Used by system installer tools to initialize the machine ID
634 stored in <filename>/etc/machine-id</filename> at install time with a
635 randomly generated ID</para>
636 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
637 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
638 </indexterm>
639 </listitem>
640 </varlistentry>
641
642 <varlistentry id="systemd-mount">
643 <term><command>systemd-mount</command></term>
644 <listitem>
645 <para>A tool to temporarily mount or auto-mount a drive.</para>
646 <indexterm zone="ch-system-systemd systemd-mount">
647 <primary sortas="b-systemd-mount">systemd-mount</primary>
648 </indexterm>
649 </listitem>
650 </varlistentry>
651
652 <varlistentry id="systemd-notify">
653 <term><command>systemd-notify</command></term>
654 <listitem>
655 <para>Used by daemon scripts to notify the init system about status
656 changes</para>
657 <indexterm zone="ch-system-systemd systemd-notify">
658 <primary sortas="b-systemd-notify">systemd-notify</primary>
659 </indexterm>
660 </listitem>
661 </varlistentry>
662
663 <varlistentry id="systemd-nspawn">
664 <term><command>systemd-nspawn</command></term>
665 <listitem>
666 <para>Used to run a command or OS in a light-weight namespace
667 container</para>
668 <indexterm zone="ch-system-systemd systemd-nspawn">
669 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
670 </indexterm>
671 </listitem>
672 </varlistentry>
673
674 <varlistentry id="systemd-path">
675 <term><command>systemd-path</command></term>
676 <listitem>
677 <para>Used to query system and user paths</para>
678 <indexterm zone="ch-system-systemd systemd-path">
679 <primary sortas="b-systemd-path">systemd-path</primary>
680 </indexterm>
681 </listitem>
682 </varlistentry>
683
684 <varlistentry id="systemd-repart">
685 <term><command>systemd-repart</command></term>
686 <listitem>
687 <para>Used go grow and add partitions to a partition table when
688 systemd is used in an OS image (e.g. a container).</para>
689 <indexterm zone="ch-system-systemd systemd-repart">
690 <primary sortas="b-systemd-repart">systemd-repart</primary>
691 </indexterm>
692 </listitem>
693 </varlistentry>
694
695 <varlistentry id="systemd-resolve">
696 <term><command>systemd-resolve</command></term>
697 <listitem>
698 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
699 resource records, and services</para>
700 <indexterm zone="ch-system-systemd systemd-resolve">
701 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
702 </indexterm>
703 </listitem>
704 </varlistentry>
705
706 <varlistentry id="systemd-run">
707 <term><command>systemd-run</command></term>
708 <listitem>
709 <para>Used to create and start a transient .service or a .scope unit
710 and run the specified command in it</para>
711 <indexterm zone="ch-system-systemd systemd-run">
712 <primary sortas="b-systemd-run">systemd-run</primary>
713 </indexterm>
714 </listitem>
715 </varlistentry>
716
717 <!-- <varlistentry id="systemd-stdio-bridge">
718 <term><command>systemd-stdio-bridge</command></term>
719 <listitem>
720 <para>To be completed</para>
721 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
722 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
723 </indexterm>
724 </listitem>
725 </varlistentry> -->
726
727 <varlistentry id="systemd-socket-activate">
728 <term><command>systemd-socket-activate</command></term>
729 <listitem>
730 <para>A tool to listen on socket devices and launch a process upon
731 connection.</para>
732 <indexterm zone="ch-system-systemd systemd-socket-activate">
733 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
734 </indexterm>
735 </listitem>
736 </varlistentry>
737
738 <varlistentry id="systemd-tmpfiles">
739 <term><command>systemd-tmpfiles</command></term>
740 <listitem>
741 <para>Creates, deletes and cleans up volatile and temporary files and
742 directories, based on the configuration file format and location
743 specified in
744 <filename class="directory">tmpfiles.d</filename> directories</para>
745 <indexterm zone="ch-system-systemd systemd-tmpfiles">
746 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
747 </indexterm>
748 </listitem>
749 </varlistentry>
750
751 <varlistentry id="systemd-umount">
752 <term><command>systemd-umount</command></term>
753 <listitem>
754 <para>Unmount mount points</para>
755 <indexterm zone="ch-system-systemd systemd-umount">
756 <primary sortas="b-systemd-umount">systemd-umount</primary>
757 </indexterm>
758 </listitem>
759 </varlistentry>
760
761 <varlistentry id="systemd-tty-ask-password-agent">
762 <term><command>systemd-tty-ask-password-agent</command></term>
763 <listitem>
764 <para>Used to list or process pending systemd password requests</para>
765 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
766 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
767 </indexterm>
768 </listitem>
769 </varlistentry>
770
771 <varlistentry id="telinit">
772 <term><command>telinit</command></term>
773 <listitem>
774 <para>Tells <command>init</command> which run-level to change
775 to</para>
776 <indexterm zone="ch-system-systemd telinit">
777 <primary sortas="b-telinit">telinit</primary>
778 </indexterm>
779 </listitem>
780 </varlistentry>
781
782 <varlistentry id="timedatectl">
783 <term><command>timedatectl</command></term>
784 <listitem>
785 <para>Used to query and change the system clock and its settings
786 </para>
787 <indexterm zone="ch-system-systemd timedatectl">
788 <primary sortas="b-timedatectl">timedatectl</primary>
789 </indexterm>
790 </listitem>
791 </varlistentry>
792
793 <varlistentry id="udevadm">
794 <term><command>udevadm</command></term>
795 <listitem>
796 <para>Generic udev administration tool: controls the udevd daemon,
797 provides info from the Udev database, monitors uevents, waits for
798 uevents to finish, tests udev configuration, and triggers uevents
799 for a given device</para>
800 <indexterm zone="ch-system-systemd udevadm">
801 <primary sortas="b-udevadm">udevadm</primary>
802 </indexterm>
803 </listitem>
804 </varlistentry>
805
806 <varlistentry id="libsystemd">
807 <term><filename class="libraryfile">libsystemd</filename></term>
808 <listitem>
809 <para>The main systemd utility library</para>
810 <indexterm zone="ch-system-systemd libsystemd">
811 <primary sortas="c-libsystemd">libsystemd</primary>
812 </indexterm>
813 </listitem>
814 </varlistentry>
815
816 <varlistentry id="libudev">
817 <term><filename class="libraryfile">libudev</filename></term>
818 <listitem>
819 <para>A library to access Udev device information</para>
820 <indexterm zone="ch-system-systemd libudev">
821 <primary sortas="c-libudev">libudev</primary>
822 </indexterm>
823 </listitem>
824 </varlistentry>
825
826 </variablelist>
827
828 </sect2>
829
830</sect1>
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