source: chapter06/systemd.xml@ 0cba512d

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Last change on this file since 0cba512d was 5d15cba, checked in by DJ Lucas <dj@…>, 7 years ago

Update to Linux-4.8.10, add flex-2.6.2-fixes-1.patch, correct systemd /sbin/sulogin issue. Fixes issues #4003, #4005, and #4006.

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11147 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
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File size: 27.8 KB
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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, fix a build error when using Util-Linux built in
44 Chapter 5:</para>
45
46<screen><userinput remap="pre">sed -i "s:blkid/::" $(grep -rl "blkid/blkid.h")</userinput></screen>
47
48<!-- Not needed as of 231. -renodr
49 <para>Fix a potential security issue with framebuffer devices:</para>
50
51<screen><userinput remap="pre">sed -e 's@DRI and frame buffer@DRI@' \
52 -e '/SUBSYSTEM==\"graphics\", KERNEL==\"fb\*\"/d' \
53 -i src/login/70-uaccess.rules</userinput></screen>
54-->
55
56 <para>Disable two tests that always fail:</para>
57
58<screen><userinput remap="pre">sed -e 's@test/udev-test.pl @@' \
59 -e 's@test-copy$(EXEEXT) @@' \
60 -i Makefile.in</userinput></screen>
61
62<!-- Not needed as of 232... anyone notice a pattern here? -renodr
63 <para>Apply a patch to fix a security issue:</para>
64
65<screen><userinput remap="pre">patch -Np1 -i ../systemd-231-security_fix-1.patch</userinput></screen>
66-->
67
68 <para>Create a file to allow systemd to build when using Util-Linux
69 built in Chapter 5, to disable LTO by default, and to build without
70 xlstproc:</para>
71
72<screen><userinput remap="pre">cat &gt; config.cache &lt;&lt; "EOF"
73<literal>KILL=/bin/kill
74MOUNT_PATH=/bin/mount
75UMOUNT_PATH=/bin/umount
76HAVE_BLKID=1
77BLKID_LIBS="-lblkid"
78BLKID_CFLAGS="-I/tools/include/blkid"
79HAVE_LIBMOUNT=1
80MOUNT_LIBS="-lmount"
81MOUNT_CFLAGS="-I/tools/include/libmount"
82cc_cv_CFLAGS__flto=no
83SULOGIN="/sbin/sulogin"
84XSLTPROC="/usr/bin/xsltproc"</literal>
85EOF</userinput></screen>
86
87 <para>LTO is disabled by default because it causes
88 <command>systemd</command> and other auxiliary programs to link to
89 <filename class="libraryfile">libgcc_s.so</filename>, slows the build down
90 and makes the compiled code larger.</para>
91
92 <para>Prepare systemd for compilation:</para>
93
94<screen><userinput remap="configure">./configure --prefix=/usr \
95 --sysconfdir=/etc \
96 --localstatedir=/var \
97 --config-cache \
98 --with-rootprefix= \
99 --with-rootlibdir=/lib \
100 --enable-split-usr \
101 --disable-firstboot \
102 --disable-ldconfig \
103 --disable-sysusers \
104 --without-python \
105 --with-default-dnssec=no \
106 --docdir=/usr/share/doc/systemd-&systemd-version;</userinput></screen>
107
108 <variablelist>
109 <title>The meaning of the configure options:</title>
110
111 <varlistentry>
112 <term><parameter>--config-cache</parameter></term>
113 <listitem>
114 <para>This switch tells the build system to use
115 the <filename>config.cache</filename> file which
116 was created earlier.</para>
117 </listitem>
118 </varlistentry>
119
120 <varlistentry>
121 <term><parameter>--with-root*</parameter></term>
122 <listitem>
123 <para>These switches ensure that core programs and
124 shared libraries are installed in the subdirectories
125 of the root partition.</para>
126 </listitem>
127 </varlistentry>
128
129 <varlistentry>
130 <term><parameter>--enable-split-usr</parameter></term>
131 <listitem>
132 <para>This switch ensures that systemd will work on
133 systems where /bin, /lib and /sbin directories are not
134 symlinks to their /usr counterparts.</para>
135 </listitem>
136 </varlistentry>
137
138 <varlistentry>
139 <term><parameter>--without-python</parameter></term>
140 <listitem>
141 <para>This switch prevents <command>configure</command>
142 from trying to use Python which isn't built
143 in LFS.</para>
144 </listitem>
145 </varlistentry>
146
147 <varlistentry>
148 <term><parameter>--disable-firstboot</parameter></term>
149 <listitem>
150 <para>This switch prevents installation of systemd
151 services responsible for setting up the system for
152 the first time. They are not useful for LFS because
153 everything is done manually.</para>
154 </listitem>
155 </varlistentry>
156
157 <varlistentry>
158 <term><parameter>--disable-ldconfig</parameter></term>
159 <listitem>
160 <para>This switch prevents installation of a systemd
161 unit that runs <command>ldconfig</command> at
162 boot, making the boot time longer. Remove it if the
163 described feature is desired, even though it's not
164 useful for source distributions such as LFS.</para>
165 </listitem>
166 </varlistentry>
167
168 <varlistentry>
169 <term><parameter>--disable-sysusers</parameter></term>
170 <listitem>
171 <para>This switch prevents installation of systemd
172 services responsible for setting up the
173 <filename>/etc/group</filename> and
174 <filename>/etc/passwd</filename> files. Both files
175 were created early in this chapter.</para>
176 </listitem>
177 </varlistentry>
178
179 <varlistentry>
180 <term><parameter>--with-default-dnssec=no</parameter></term>
181 <listitem>
182 <para>This switch turns off the experimental DNSSEC suport.</para>
183 </listitem>
184 </varlistentry>
185
186 </variablelist>
187
188 <para>Compile the package:</para>
189
190<screen><userinput remap="make">make LIBRARY_PATH=/tools/lib</userinput></screen>
191
192 <para>This package has a test suite, but it can only be run after the
193 package has been installed.</para>
194
195 <para>Install the package:</para>
196
197<screen><userinput remap="install">make LD_LIBRARY_PATH=/tools/lib install</userinput></screen>
198
199<!-- These get installed into /lib now by default.
200 <para>Move the NSS libraries to <filename class="directory">/lib</filename>:</para>
201
202<screen><userinput remap="install">mv -v /usr/lib/libnss_{myhostname,mymachines,resolve}.so.2 /lib</userinput></screen>
203-->
204
205 <para>Remove an unnecessary directory:</para>
206
207<screen><userinput remap="install">rm -rfv /usr/lib/rpm</userinput></screen>
208
209 <para>Create the Sysvinit compatibility symlinks, so systemd is used
210 as the default init system:</para>
211
212<screen><userinput remap="install">for tool in runlevel reboot shutdown poweroff halt telinit; do
213 ln -sfv ../bin/systemctl /sbin/${tool}
214done
215ln -sfv ../lib/systemd/systemd /sbin/init</userinput></screen>
216
217<!--
218 <para>Remove a reference to a non-existent group:</para>
219
220<screen><userinput remap="install">sed -i "s:0775 root lock:0755 root root:g" /usr/lib/tmpfiles.d/legacy.conf</userinput></screen>
221-->
222
223 <para>Create the <filename>/etc/machine-id</filename> file needed by
224 <command>systemd-journald</command>:</para>
225
226<screen><userinput remap="install">systemd-machine-id-setup</userinput></screen>
227
228 <para>Since the testsuite largely depends on the host system kernel
229 configuration, some tests may fail. It also needs a modification in
230 order not to look for a program that will be installed by Util-Linux
231 package later in this chapter. To test the results, issue:</para>
232
233<screen><userinput remap="test">sed -i "s:minix:ext4:g" src/test/test-path-util.c
234make LD_LIBRARY_PATH=/tools/lib -k check</userinput></screen>
235
236 </sect2>
237
238 <sect2 id="contents-systemd" role="content">
239 <title>Contents of systemd</title>
240
241 <segmentedlist>
242 <segtitle>Installed programs</segtitle>
243 <segtitle>Installed libraries</segtitle>
244 <segtitle>Installed directories</segtitle>
245
246 <seglistitem>
247 <seg>bootctl, busctl, coredumpctl, halt, hostnamectl, init, journalctl,
248 kernel-install, localectl, loginctl, machinectl, networkctl, poweroff,
249 reboot, runlevel, shutdown, systemctl, systemd-analyze,
250 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
251 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
252 systemd-inhibit, systemd-machine-id-setup, systemd-mount,
253 systemd-notify, systemd-nspawn, systemd-path, systemd-resolve,
254 systemd-run, systemd-socket-activate,
255 systemd-stdio-bridge, systemd-tmpfiles, systemd-tty-ask-password-agent,
256 telinit, timedatectl, and udevadm</seg>
257 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
258 libnss_resolve.so.2, libnss_systemd.so.2,
259 libsystemd.so, libsystemd-shared-231.so,
260 and libudev.so</seg>
261 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
262 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
263 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
264 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
265 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
266 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
267 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
268 </seglistitem>
269 </segmentedlist>
270
271 <variablelist>
272 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
273 <?dbfo list-presentation="list"?>
274 <?dbhtml list-presentation="table"?>
275
276 <varlistentry id="bootctl">
277 <term><command>bootctl</command></term>
278 <listitem>
279 <para>used to query the firmware and boot manager settings</para>
280 <indexterm zone="ch-system-systemd bootctl">
281 <primary sortas="b-bootctl">bootctl</primary>
282 </indexterm>
283 </listitem>
284 </varlistentry>
285
286 <varlistentry id="busctl">
287 <term><command>busctl</command></term>
288 <listitem>
289 <para>Used to introspect and monitor the D-Bus bus</para>
290 <indexterm zone="ch-system-systemd busctl">
291 <primary sortas="b-busctl">busctl</primary>
292 </indexterm>
293 </listitem>
294 </varlistentry>
295
296 <varlistentry id="coredumpctl">
297 <term><command>coredumpctl</command></term>
298 <listitem>
299 <para>Used to retrieve coredumps from the systemd Journal</para>
300 <indexterm zone="ch-system-systemd coredumpctl">
301 <primary sortas="b-coredumpctl">coredumpctl</primary>
302 </indexterm>
303 </listitem>
304 </varlistentry>
305
306 <varlistentry id="halt">
307 <term><command>halt</command></term>
308 <listitem>
309 <para>Normally invokes <command>shutdown</command> with the
310 <parameter>-h</parameter> option, except when already in run-level 0,
311 then it tells the kernel to halt the system; it notes in the
312 file <filename>/var/log/wtmp</filename> that the system is being
313 brought down</para>
314 <indexterm zone="ch-system-systemd halt">
315 <primary sortas="b-halt">halt</primary>
316 </indexterm>
317 </listitem>
318 </varlistentry>
319
320 <varlistentry id="hostnamectl">
321 <term><command>hostnamectl</command></term>
322 <listitem>
323 <para>Used to query and change the system hostname and related
324 settings</para>
325 <indexterm zone="ch-system-systemd hostnamectl">
326 <primary sortas="b-hostnamectl">hostnamectl</primary>
327 </indexterm>
328 </listitem>
329 </varlistentry>
330
331 <varlistentry id="init">
332 <term><command>init</command></term>
333 <listitem>
334 <para>The first process to be started when the kernel has initialized
335 the hardware which takes over the boot process and starts all the
336 proceses it is instructed to</para>
337 <indexterm zone="ch-system-systemd init">
338 <primary sortas="b-init">init</primary>
339 </indexterm>
340 </listitem>
341 </varlistentry>
342
343 <varlistentry id="journalctl">
344 <term><command>journalctl</command></term>
345 <listitem>
346 <para>Used to query the contents of the systemd Journal</para>
347 <indexterm zone="ch-system-systemd journalctl">
348 <primary sortas="b-journalctl">journalctl</primary>
349 </indexterm>
350 </listitem>
351 </varlistentry>
352
353 <varlistentry id="kernel-install">
354 <term><command>kernel-install</command></term>
355 <listitem>
356 <para>Used to add and remove kernel and initramfs images to and
357 from /boot</para>
358 <indexterm zone="ch-system-systemd kernel-install">
359 <primary sortas="b-kernel-install">kernel-install</primary>
360 </indexterm>
361 </listitem>
362 </varlistentry>
363
364 <varlistentry id="localectl">
365 <term><command>localectl</command></term>
366 <listitem>
367 <para>Used to query and change the system locale and keyboard layout
368 settings</para>
369 <indexterm zone="ch-system-systemd localectl">
370 <primary sortas="b-localectl">localectl</primary>
371 </indexterm>
372 </listitem>
373 </varlistentry>
374
375 <varlistentry id="loginctl">
376 <term><command>loginctl</command></term>
377 <listitem>
378 <para>Used to introspect and control the state of the systemd Login
379 Manager</para>
380 <indexterm zone="ch-system-systemd loginctl">
381 <primary sortas="b-loginctl">loginctl</primary>
382 </indexterm>
383 </listitem>
384 </varlistentry>
385
386 <varlistentry id="machinectl">
387 <term><command>machinectl</command></term>
388 <listitem>
389 <para>Used to introspect and control the state of the systemd Virtual
390 Machine and Container Registration Manager</para>
391 <indexterm zone="ch-system-systemd machinectl">
392 <primary sortas="b-machinectl">machinectl</primary>
393 </indexterm>
394 </listitem>
395 </varlistentry>
396
397 <varlistentry id="networkctl">
398 <term><command>networkctl</command></term>
399 <listitem>
400 <para>Used to introspect the state of the network links as seen by
401 systemd-networkd</para>
402 <indexterm zone="ch-system-systemd networkctl">
403 <primary sortas="b-networkctl">networkctl</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="runlevel">
431 <term><command>runlevel</command></term>
432 <listitem>
433 <para>Reports the previous and the current run-level, as noted in the
434 last run-level record in <filename>/var/run/utmp</filename></para>
435 <indexterm zone="ch-system-systemd runlevel">
436 <primary sortas="b-runlevel">runlevel</primary>
437 </indexterm>
438 </listitem>
439 </varlistentry>
440
441 <varlistentry id="shutdown">
442 <term><command>shutdown</command></term>
443 <listitem>
444 <para>Brings the system down in a secure way, signaling all processes
445 and notifying all logged-in users</para>
446 <indexterm zone="ch-system-systemd shutdown">
447 <primary sortas="b-shutdown">shutdown</primary>
448 </indexterm>
449 </listitem>
450 </varlistentry>
451
452 <varlistentry id="systemctl">
453 <term><command>systemctl</command></term>
454 <listitem>
455 <para>Used to introspect and control the state of the systemd system
456 and service manager</para>
457 <indexterm zone="ch-system-systemd systemctl">
458 <primary sortas="b-systemctl">systemctl</primary>
459 </indexterm>
460 </listitem>
461 </varlistentry>
462
463 <varlistentry id="systemd-analyze">
464 <term><command>systemd-analyze</command></term>
465 <listitem>
466 <para>Used to determine system boot-up performance of the current
467 boot</para>
468 <indexterm zone="ch-system-systemd systemd-analyze">
469 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
470 </indexterm>
471 </listitem>
472 </varlistentry>
473
474 <varlistentry id="systemd-ask-password">
475 <term><command>systemd-ask-password</command></term>
476 <listitem>
477 <para>Used to query a system password or passphrase from the user,
478 using a question message specified on the command line</para>
479 <indexterm zone="ch-system-systemd systemd-ask-password">
480 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
481 </indexterm>
482 </listitem>
483 </varlistentry>
484
485 <varlistentry id="systemd-cat">
486 <term><command>systemd-cat</command></term>
487 <listitem>
488 <para>Used to connect STDOUT and STDERR of a process with the Journal
489 </para>
490 <indexterm zone="ch-system-systemd systemd-cat">
491 <primary sortas="b-systemd-cat">systemd-cat</primary>
492 </indexterm>
493 </listitem>
494 </varlistentry>
495
496 <varlistentry id="systemd-cgls">
497 <term><command>systemd-cgls</command></term>
498 <listitem>
499 <para>Recursively shows the contents of the selected Linux control
500 group hierarchy in a tree</para>
501 <indexterm zone="ch-system-systemd systemd-cgls">
502 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
503 </indexterm>
504 </listitem>
505 </varlistentry>
506
507 <varlistentry id="systemd-cgtop">
508 <term><command>systemd-cgtop</command></term>
509 <listitem>
510 <para>Shows the top control groups of the local Linux control group
511 hierarchy, ordered by their CPU, memory and disk I/O load</para>
512 <indexterm zone="ch-system-systemd systemd-cgtop">
513 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
514 </indexterm>
515 </listitem>
516 </varlistentry>
517
518 <varlistentry id="systemd-delta">
519 <term><command>systemd-delta</command></term>
520 <listitem>
521 <para>Used to identify and compare configuration files in
522 <filename class="directory">/etc</filename> that override default
523 counterparts in <filename class="directory">/usr</filename></para>
524 <indexterm zone="ch-system-systemd systemd-delta">
525 <primary sortas="b-systemd-delta">systemd-delta</primary>
526 </indexterm>
527 </listitem>
528 </varlistentry>
529
530 <varlistentry id="systemd-detect-virt">
531 <term><command>systemd-detect-virt</command></term>
532 <listitem>
533 <para>Detects execution in a virtualized environment</para>
534 <indexterm zone="ch-system-systemd systemd-detect-virt">
535 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
536 </indexterm>
537 </listitem>
538 </varlistentry>
539
540 <varlistentry id="systemd-escape">
541 <term><command>systemd-escape</command></term>
542 <listitem>
543 <para>Used to escape strings for inclusion in systemd unit
544 names</para>
545 <indexterm zone="ch-system-systemd systemd-escape">
546 <primary sortas="b-systemd-escape">systemd-escape</primary>
547 </indexterm>
548 </listitem>
549 </varlistentry>
550
551 <varlistentry id="systemd-hwdb">
552 <term><command>systemd-hwdb</command></term>
553 <listitem>
554 <para>Used to manage hardware database (hwdb)</para>
555 <indexterm zone="ch-system-systemd systemd-hwdb">
556 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
557 </indexterm>
558 </listitem>
559 </varlistentry>
560
561 <varlistentry id="systemd-inhibit">
562 <term><command>systemd-inhibit</command></term>
563 <listitem>
564 <para>Used to execute a program with a shutdown, sleep or idle
565 inhibitor lock taken</para>
566 <indexterm zone="ch-system-systemd systemd-inhibit">
567 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
568 </indexterm>
569 </listitem>
570 </varlistentry>
571
572 <varlistentry id="systemd-machine-id-setup">
573 <term><command>systemd-machine-id-setup</command></term>
574 <listitem>
575 <para>Used by system installer tools to initialize the machine ID
576 stored in <filename>/etc/machine-id</filename> at install time with a
577 randomly generated ID</para>
578 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
579 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
580 </indexterm>
581 </listitem>
582 </varlistentry>
583
584 <varlistentry id="systemd-mount">
585 <term><command>systemd-mount</command></term>
586 <listitem>
587 <para>is a tool to temporarily mount or auto-mount a drive.</para>
588 <indexterm zone="ch-system-systemd systemd-mount">
589 <primary sortas="b-systemd-mount">systemd-mount</primary>
590 </indexterm>
591 </listitem>
592 </varlistentry>
593
594 <varlistentry id="systemd-notify">
595 <term><command>systemd-notify</command></term>
596 <listitem>
597 <para>Used by daemon scripts to notify the init system about status
598 changes</para>
599 <indexterm zone="ch-system-systemd systemd-notify">
600 <primary sortas="b-systemd-notify">systemd-notify</primary>
601 </indexterm>
602 </listitem>
603 </varlistentry>
604
605 <varlistentry id="systemd-nspawn">
606 <term><command>systemd-nspawn</command></term>
607 <listitem>
608 <para>Used to run a command or OS in a light-weight namespace
609 container</para>
610 <indexterm zone="ch-system-systemd systemd-nspawn">
611 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
612 </indexterm>
613 </listitem>
614 </varlistentry>
615
616 <varlistentry id="systemd-path">
617 <term><command>systemd-path</command></term>
618 <listitem>
619 <para>Used to query system and user paths</para>
620 <indexterm zone="ch-system-systemd systemd-path">
621 <primary sortas="b-systemd-path">systemd-path</primary>
622 </indexterm>
623 </listitem>
624 </varlistentry>
625
626 <varlistentry id="systemd-resolve">
627 <term><command>systemd-resolve</command></term>
628 <listitem>
629 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
630 resource records, and services</para>
631 <indexterm zone="ch-system-systemd systemd-resolve">
632 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
633 </indexterm>
634 </listitem>
635 </varlistentry>
636
637 <varlistentry id="systemd-run">
638 <term><command>systemd-run</command></term>
639 <listitem>
640 <para>Used to create and start a transient .service or a .scope unit
641 and run the specified command in it</para>
642 <indexterm zone="ch-system-systemd systemd-run">
643 <primary sortas="b-systemd-run">systemd-run</primary>
644 </indexterm>
645 </listitem>
646 </varlistentry>
647
648 <!-- <varlistentry id="systemd-stdio-bridge">
649 <term><command>systemd-stdio-bridge</command></term>
650 <listitem>
651 <para>To be completed</para>
652 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
653 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
654 </indexterm>
655 </listitem>
656 </varlistentry> -->
657
658 <varlistentry id="systemd-socket-activate">
659 <term><command>systemd-socket-activate</command></term>
660 <listitem>
661 <para>is a tool to listen on socket devices and launch a process upon
662 connection.</para>
663 <indexterm zone="ch-system-systemd systemd-socket-activate">
664 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
665 </indexterm>
666 </listitem>
667 </varlistentry>
668
669 <varlistentry id="systemd-tmpfiles">
670 <term><command>systemd-tmpfiles</command></term>
671 <listitem>
672 <para>Creates, deletes and cleans up volatile and temporary files and
673 directories, based on the configuration file format and location
674 specified in
675 <filename class="directory">tmpfiles.d</filename> directories</para>
676 <indexterm zone="ch-system-systemd systemd-tmpfiles">
677 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
678 </indexterm>
679 </listitem>
680 </varlistentry>
681
682 <varlistentry id="systemd-tty-ask-password-agent">
683 <term><command>systemd-tty-ask-password-agent</command></term>
684 <listitem>
685 <para>Used to list or process pending systemd password requests</para>
686 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
687 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
688 </indexterm>
689 </listitem>
690 </varlistentry>
691
692 <varlistentry id="telinit">
693 <term><command>telinit</command></term>
694 <listitem>
695 <para>Tells <command>init</command> which run-level to change
696 to</para>
697 <indexterm zone="ch-system-systemd telinit">
698 <primary sortas="b-telinit">telinit</primary>
699 </indexterm>
700 </listitem>
701 </varlistentry>
702
703 <varlistentry id="timedatectl">
704 <term><command>timedatectl</command></term>
705 <listitem>
706 <para>Used to query and change the system clock and its settings
707 </para>
708 <indexterm zone="ch-system-systemd timedatectl">
709 <primary sortas="b-timedatectl">timedatectl</primary>
710 </indexterm>
711 </listitem>
712 </varlistentry>
713
714 <varlistentry id="udevadm">
715 <term><command>udevadm</command></term>
716 <listitem>
717 <para>Generic Udev administration tool: controls the udevd daemon,
718 provides info from the Udev database, monitors uevents, waits for
719 uevents to finish, tests Udev configuration, and triggers uevents
720 for a given device</para>
721 <indexterm zone="ch-system-systemd udevadm">
722 <primary sortas="b-udevadm">udevadm</primary>
723 </indexterm>
724 </listitem>
725 </varlistentry>
726
727 <varlistentry id="libsystemd">
728 <term><filename class="libraryfile">libsystemd</filename></term>
729 <listitem>
730 <para>systemd utility library</para>
731 <indexterm zone="ch-system-systemd libsystemd">
732 <primary sortas="c-libsystemd">libsystemd</primary>
733 </indexterm>
734 </listitem>
735 </varlistentry>
736
737 <varlistentry id="libudev">
738 <term><filename class="libraryfile">libudev</filename></term>
739 <listitem>
740 <para>A library to access Udev device information</para>
741 <indexterm zone="ch-system-systemd libudev">
742 <primary sortas="c-libudev">libudev</primary>
743 </indexterm>
744 </listitem>
745 </varlistentry>
746
747 </variablelist>
748
749 </sect2>
750
751</sect1>
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