source: chapter06/systemd.xml@ 13c8b42

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Last change on this file since 13c8b42 was 13c8b42, checked in by Douglas R. Reno <renodr@…>, 7 years ago

Update to linux-4.8.8
Update to systemd-232

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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
83XSLTPROC="/usr/bin/xsltproc"</literal>
84EOF</userinput></screen>
85
86 <para>LTO is disabled by default because it causes
87 <command>systemd</command> and other auxiliary programs to link to
88 <filename class="libraryfile">libgcc_s.so</filename>, slows the build down
89 and makes the compiled code larger.</para>
90
91 <para>Prepare systemd for compilation:</para>
92
93<screen><userinput remap="configure">./configure --prefix=/usr \
94 --sysconfdir=/etc \
95 --localstatedir=/var \
96 --config-cache \
97 --with-rootprefix= \
98 --with-rootlibdir=/lib \
99 --enable-split-usr \
100 --disable-firstboot \
101 --disable-ldconfig \
102 --disable-sysusers \
103 --without-python \
104 --with-default-dnssec=no \
105 --docdir=/usr/share/doc/systemd-&systemd-version;</userinput></screen>
106
107 <variablelist>
108 <title>The meaning of the configure options:</title>
109
110 <varlistentry>
111 <term><parameter>--config-cache</parameter></term>
112 <listitem>
113 <para>This switch tells the build system to use
114 the <filename>config.cache</filename> file which
115 was created earlier.</para>
116 </listitem>
117 </varlistentry>
118
119 <varlistentry>
120 <term><parameter>--with-root*</parameter></term>
121 <listitem>
122 <para>These switches ensure that core programs and
123 shared libraries are installed in the subdirectories
124 of the root partition.</para>
125 </listitem>
126 </varlistentry>
127
128 <varlistentry>
129 <term><parameter>--enable-split-usr</parameter></term>
130 <listitem>
131 <para>This switch ensures that systemd will work on
132 systems where /bin, /lib and /sbin directories are not
133 symlinks to their /usr counterparts.</para>
134 </listitem>
135 </varlistentry>
136
137 <varlistentry>
138 <term><parameter>--without-python</parameter></term>
139 <listitem>
140 <para>This switch prevents <command>configure</command>
141 from trying to use Python which isn't built
142 in LFS.</para>
143 </listitem>
144 </varlistentry>
145
146 <varlistentry>
147 <term><parameter>--disable-firstboot</parameter></term>
148 <listitem>
149 <para>This switch prevents installation of systemd
150 services responsible for setting up the system for
151 the first time. They are not useful for LFS because
152 everything is done manually.</para>
153 </listitem>
154 </varlistentry>
155
156 <varlistentry>
157 <term><parameter>--disable-ldconfig</parameter></term>
158 <listitem>
159 <para>This switch prevents installation of a systemd
160 unit that runs <command>ldconfig</command> at
161 boot, making the boot time longer. Remove it if the
162 described feature is desired, even though it's not
163 useful for source distributions such as LFS.</para>
164 </listitem>
165 </varlistentry>
166
167 <varlistentry>
168 <term><parameter>--disable-sysusers</parameter></term>
169 <listitem>
170 <para>This switch prevents installation of systemd
171 services responsible for setting up the
172 <filename>/etc/group</filename> and
173 <filename>/etc/passwd</filename> files. Both files
174 were created early in this chapter.</para>
175 </listitem>
176 </varlistentry>
177
178 <varlistentry>
179 <term><parameter>--with-default-dnssec=no</parameter></term>
180 <listitem>
181 <para>This switch turns off the experimental DNSSEC suport.</para>
182 </listitem>
183 </varlistentry>
184
185 </variablelist>
186
187 <para>Compile the package:</para>
188
189<screen><userinput remap="make">make LIBRARY_PATH=/tools/lib</userinput></screen>
190
191 <para>This package has a test suite, but it can only be run after the
192 package has been installed.</para>
193
194 <para>Install the package:</para>
195
196<screen><userinput remap="install">make LD_LIBRARY_PATH=/tools/lib install</userinput></screen>
197
198<!-- These get installed into /lib now by default.
199 <para>Move the NSS libraries to <filename class="directory">/lib</filename>:</para>
200
201<screen><userinput remap="install">mv -v /usr/lib/libnss_{myhostname,mymachines,resolve}.so.2 /lib</userinput></screen>
202-->
203
204 <para>Remove an unnecessary directory:</para>
205
206<screen><userinput remap="install">rm -rfv /usr/lib/rpm</userinput></screen>
207
208 <para>Create the Sysvinit compatibility symlinks, so systemd is used
209 as the default init system:</para>
210
211<screen><userinput remap="install">for tool in runlevel reboot shutdown poweroff halt telinit; do
212 ln -sfv ../bin/systemctl /sbin/${tool}
213done
214ln -sfv ../lib/systemd/systemd /sbin/init</userinput></screen>
215
216<!--
217 <para>Remove a reference to a non-existent group:</para>
218
219<screen><userinput remap="install">sed -i "s:0775 root lock:0755 root root:g" /usr/lib/tmpfiles.d/legacy.conf</userinput></screen>
220-->
221
222 <para>Create the <filename>/etc/machine-id</filename> file needed by
223 <command>systemd-journald</command>:</para>
224
225<screen><userinput remap="install">systemd-machine-id-setup</userinput></screen>
226
227 <para>Since the testsuite largely depends on the host system kernel
228 configuration, some tests may fail. It also needs a modification in
229 order not to look for a program that will be installed by Util-Linux
230 package later in this chapter. To test the results, issue:</para>
231
232<screen><userinput remap="test">sed -i "s:minix:ext4:g" src/test/test-path-util.c
233make LD_LIBRARY_PATH=/tools/lib -k check</userinput></screen>
234
235 </sect2>
236
237 <sect2 id="contents-systemd" role="content">
238 <title>Contents of systemd</title>
239
240 <segmentedlist>
241 <segtitle>Installed programs</segtitle>
242 <segtitle>Installed libraries</segtitle>
243 <segtitle>Installed directories</segtitle>
244
245 <seglistitem>
246 <seg>bootctl, busctl, coredumpctl, halt, hostnamectl, init, journalctl,
247 kernel-install, localectl, loginctl, machinectl, networkctl, poweroff,
248 reboot, runlevel, shutdown, systemctl, systemd-analyze,
249 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
250 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
251 systemd-inhibit, systemd-machine-id-setup, systemd-mount,
252 systemd-notify, systemd-nspawn, systemd-path, systemd-resolve,
253 systemd-run, systemd-socket-activate,
254 systemd-stdio-bridge, systemd-tmpfiles, systemd-tty-ask-password-agent,
255 telinit, timedatectl, and udevadm</seg>
256 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
257 libnss_resolve.so.2, libnss_systemd.so.2,
258 libsystemd.so, libsystemd-shared-231.so,
259 and libudev.so</seg>
260 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
261 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
262 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
263 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
264 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
265 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
266 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
267 </seglistitem>
268 </segmentedlist>
269
270 <variablelist>
271 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
272 <?dbfo list-presentation="list"?>
273 <?dbhtml list-presentation="table"?>
274
275 <varlistentry id="bootctl">
276 <term><command>bootctl</command></term>
277 <listitem>
278 <para>used to query the firmware and boot manager settings</para>
279 <indexterm zone="ch-system-systemd bootctl">
280 <primary sortas="b-bootctl">bootctl</primary>
281 </indexterm>
282 </listitem>
283 </varlistentry>
284
285 <varlistentry id="busctl">
286 <term><command>busctl</command></term>
287 <listitem>
288 <para>Used to introspect and monitor the D-Bus bus</para>
289 <indexterm zone="ch-system-systemd busctl">
290 <primary sortas="b-busctl">busctl</primary>
291 </indexterm>
292 </listitem>
293 </varlistentry>
294
295 <varlistentry id="coredumpctl">
296 <term><command>coredumpctl</command></term>
297 <listitem>
298 <para>Used to retrieve coredumps from the systemd Journal</para>
299 <indexterm zone="ch-system-systemd coredumpctl">
300 <primary sortas="b-coredumpctl">coredumpctl</primary>
301 </indexterm>
302 </listitem>
303 </varlistentry>
304
305 <varlistentry id="halt">
306 <term><command>halt</command></term>
307 <listitem>
308 <para>Normally invokes <command>shutdown</command> with the
309 <parameter>-h</parameter> option, except when already in run-level 0,
310 then it tells the kernel to halt the system; it notes in the
311 file <filename>/var/log/wtmp</filename> that the system is being
312 brought down</para>
313 <indexterm zone="ch-system-systemd halt">
314 <primary sortas="b-halt">halt</primary>
315 </indexterm>
316 </listitem>
317 </varlistentry>
318
319 <varlistentry id="hostnamectl">
320 <term><command>hostnamectl</command></term>
321 <listitem>
322 <para>Used to query and change the system hostname and related
323 settings</para>
324 <indexterm zone="ch-system-systemd hostnamectl">
325 <primary sortas="b-hostnamectl">hostnamectl</primary>
326 </indexterm>
327 </listitem>
328 </varlistentry>
329
330 <varlistentry id="init">
331 <term><command>init</command></term>
332 <listitem>
333 <para>The first process to be started when the kernel has initialized
334 the hardware which takes over the boot process and starts all the
335 proceses it is instructed to</para>
336 <indexterm zone="ch-system-systemd init">
337 <primary sortas="b-init">init</primary>
338 </indexterm>
339 </listitem>
340 </varlistentry>
341
342 <varlistentry id="journalctl">
343 <term><command>journalctl</command></term>
344 <listitem>
345 <para>Used to query the contents of the systemd Journal</para>
346 <indexterm zone="ch-system-systemd journalctl">
347 <primary sortas="b-journalctl">journalctl</primary>
348 </indexterm>
349 </listitem>
350 </varlistentry>
351
352 <varlistentry id="kernel-install">
353 <term><command>kernel-install</command></term>
354 <listitem>
355 <para>Used to add and remove kernel and initramfs images to and
356 from /boot</para>
357 <indexterm zone="ch-system-systemd kernel-install">
358 <primary sortas="b-kernel-install">kernel-install</primary>
359 </indexterm>
360 </listitem>
361 </varlistentry>
362
363 <varlistentry id="localectl">
364 <term><command>localectl</command></term>
365 <listitem>
366 <para>Used to query and change the system locale and keyboard layout
367 settings</para>
368 <indexterm zone="ch-system-systemd localectl">
369 <primary sortas="b-localectl">localectl</primary>
370 </indexterm>
371 </listitem>
372 </varlistentry>
373
374 <varlistentry id="loginctl">
375 <term><command>loginctl</command></term>
376 <listitem>
377 <para>Used to introspect and control the state of the systemd Login
378 Manager</para>
379 <indexterm zone="ch-system-systemd loginctl">
380 <primary sortas="b-loginctl">loginctl</primary>
381 </indexterm>
382 </listitem>
383 </varlistentry>
384
385 <varlistentry id="machinectl">
386 <term><command>machinectl</command></term>
387 <listitem>
388 <para>Used to introspect and control the state of the systemd Virtual
389 Machine and Container Registration Manager</para>
390 <indexterm zone="ch-system-systemd machinectl">
391 <primary sortas="b-machinectl">machinectl</primary>
392 </indexterm>
393 </listitem>
394 </varlistentry>
395
396 <varlistentry id="networkctl">
397 <term><command>networkctl</command></term>
398 <listitem>
399 <para>Used to introspect the state of the network links as seen by
400 systemd-networkd</para>
401 <indexterm zone="ch-system-systemd networkctl">
402 <primary sortas="b-networkctl">networkctl</primary>
403 </indexterm>
404 </listitem>
405 </varlistentry>
406
407 <varlistentry id="poweroff">
408 <term><command>poweroff</command></term>
409 <listitem>
410 <para>Tells the kernel to halt the system and switch off the computer
411 (see <command>halt</command>)</para>
412 <indexterm zone="ch-system-systemd poweroff">
413 <primary sortas="b-poweroff">poweroff</primary>
414 </indexterm>
415 </listitem>
416 </varlistentry>
417
418 <varlistentry id="reboot">
419 <term><command>reboot</command></term>
420 <listitem>
421 <para>Tells the kernel to reboot the system (see
422 <command>halt</command>)</para>
423 <indexterm zone="ch-system-systemd reboot">
424 <primary sortas="b-reboot">reboot</primary>
425 </indexterm>
426 </listitem>
427 </varlistentry>
428
429 <varlistentry id="runlevel">
430 <term><command>runlevel</command></term>
431 <listitem>
432 <para>Reports the previous and the current run-level, as noted in the
433 last run-level record in <filename>/var/run/utmp</filename></para>
434 <indexterm zone="ch-system-systemd runlevel">
435 <primary sortas="b-runlevel">runlevel</primary>
436 </indexterm>
437 </listitem>
438 </varlistentry>
439
440 <varlistentry id="shutdown">
441 <term><command>shutdown</command></term>
442 <listitem>
443 <para>Brings the system down in a secure way, signaling all processes
444 and notifying all logged-in users</para>
445 <indexterm zone="ch-system-systemd shutdown">
446 <primary sortas="b-shutdown">shutdown</primary>
447 </indexterm>
448 </listitem>
449 </varlistentry>
450
451 <varlistentry id="systemctl">
452 <term><command>systemctl</command></term>
453 <listitem>
454 <para>Used to introspect and control the state of the systemd system
455 and service manager</para>
456 <indexterm zone="ch-system-systemd systemctl">
457 <primary sortas="b-systemctl">systemctl</primary>
458 </indexterm>
459 </listitem>
460 </varlistentry>
461
462 <varlistentry id="systemd-analyze">
463 <term><command>systemd-analyze</command></term>
464 <listitem>
465 <para>Used to determine system boot-up performance of the current
466 boot</para>
467 <indexterm zone="ch-system-systemd systemd-analyze">
468 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
469 </indexterm>
470 </listitem>
471 </varlistentry>
472
473 <varlistentry id="systemd-ask-password">
474 <term><command>systemd-ask-password</command></term>
475 <listitem>
476 <para>Used to query a system password or passphrase from the user,
477 using a question message specified on the command line</para>
478 <indexterm zone="ch-system-systemd systemd-ask-password">
479 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
480 </indexterm>
481 </listitem>
482 </varlistentry>
483
484 <varlistentry id="systemd-cat">
485 <term><command>systemd-cat</command></term>
486 <listitem>
487 <para>Used to connect STDOUT and STDERR of a process with the Journal
488 </para>
489 <indexterm zone="ch-system-systemd systemd-cat">
490 <primary sortas="b-systemd-cat">systemd-cat</primary>
491 </indexterm>
492 </listitem>
493 </varlistentry>
494
495 <varlistentry id="systemd-cgls">
496 <term><command>systemd-cgls</command></term>
497 <listitem>
498 <para>Recursively shows the contents of the selected Linux control
499 group hierarchy in a tree</para>
500 <indexterm zone="ch-system-systemd systemd-cgls">
501 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
502 </indexterm>
503 </listitem>
504 </varlistentry>
505
506 <varlistentry id="systemd-cgtop">
507 <term><command>systemd-cgtop</command></term>
508 <listitem>
509 <para>Shows the top control groups of the local Linux control group
510 hierarchy, ordered by their CPU, memory and disk I/O load</para>
511 <indexterm zone="ch-system-systemd systemd-cgtop">
512 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
513 </indexterm>
514 </listitem>
515 </varlistentry>
516
517 <varlistentry id="systemd-delta">
518 <term><command>systemd-delta</command></term>
519 <listitem>
520 <para>Used to identify and compare configuration files in
521 <filename class="directory">/etc</filename> that override default
522 counterparts in <filename class="directory">/usr</filename></para>
523 <indexterm zone="ch-system-systemd systemd-delta">
524 <primary sortas="b-systemd-delta">systemd-delta</primary>
525 </indexterm>
526 </listitem>
527 </varlistentry>
528
529 <varlistentry id="systemd-detect-virt">
530 <term><command>systemd-detect-virt</command></term>
531 <listitem>
532 <para>Detects execution in a virtualized environment</para>
533 <indexterm zone="ch-system-systemd systemd-detect-virt">
534 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
535 </indexterm>
536 </listitem>
537 </varlistentry>
538
539 <varlistentry id="systemd-escape">
540 <term><command>systemd-escape</command></term>
541 <listitem>
542 <para>Used to escape strings for inclusion in systemd unit
543 names</para>
544 <indexterm zone="ch-system-systemd systemd-escape">
545 <primary sortas="b-systemd-escape">systemd-escape</primary>
546 </indexterm>
547 </listitem>
548 </varlistentry>
549
550 <varlistentry id="systemd-hwdb">
551 <term><command>systemd-hwdb</command></term>
552 <listitem>
553 <para>Used to manage hardware database (hwdb)</para>
554 <indexterm zone="ch-system-systemd systemd-hwdb">
555 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
556 </indexterm>
557 </listitem>
558 </varlistentry>
559
560 <varlistentry id="systemd-inhibit">
561 <term><command>systemd-inhibit</command></term>
562 <listitem>
563 <para>Used to execute a program with a shutdown, sleep or idle
564 inhibitor lock taken</para>
565 <indexterm zone="ch-system-systemd systemd-inhibit">
566 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
567 </indexterm>
568 </listitem>
569 </varlistentry>
570
571 <varlistentry id="systemd-machine-id-setup">
572 <term><command>systemd-machine-id-setup</command></term>
573 <listitem>
574 <para>Used by system installer tools to initialize the machine ID
575 stored in <filename>/etc/machine-id</filename> at install time with a
576 randomly generated ID</para>
577 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
578 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
579 </indexterm>
580 </listitem>
581 </varlistentry>
582
583 <varlistentry id="systemd-mount">
584 <term><command>systemd-mount</command></term>
585 <listitem>
586 <para>is a tool to temporarily mount or auto-mount a drive.</para>
587 <indexterm zone="ch-system-systemd systemd-mount">
588 <primary sortas="b-systemd-mount">systemd-mount</primary>
589 </indexterm>
590 </listitem>
591 </varlistentry>
592
593 <varlistentry id="systemd-notify">
594 <term><command>systemd-notify</command></term>
595 <listitem>
596 <para>Used by daemon scripts to notify the init system about status
597 changes</para>
598 <indexterm zone="ch-system-systemd systemd-notify">
599 <primary sortas="b-systemd-notify">systemd-notify</primary>
600 </indexterm>
601 </listitem>
602 </varlistentry>
603
604 <varlistentry id="systemd-nspawn">
605 <term><command>systemd-nspawn</command></term>
606 <listitem>
607 <para>Used to run a command or OS in a light-weight namespace
608 container</para>
609 <indexterm zone="ch-system-systemd systemd-nspawn">
610 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
611 </indexterm>
612 </listitem>
613 </varlistentry>
614
615 <varlistentry id="systemd-path">
616 <term><command>systemd-path</command></term>
617 <listitem>
618 <para>Used to query system and user paths</para>
619 <indexterm zone="ch-system-systemd systemd-path">
620 <primary sortas="b-systemd-path">systemd-path</primary>
621 </indexterm>
622 </listitem>
623 </varlistentry>
624
625 <varlistentry id="systemd-resolve">
626 <term><command>systemd-resolve</command></term>
627 <listitem>
628 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
629 resource records, and services</para>
630 <indexterm zone="ch-system-systemd systemd-resolve">
631 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
632 </indexterm>
633 </listitem>
634 </varlistentry>
635
636 <varlistentry id="systemd-run">
637 <term><command>systemd-run</command></term>
638 <listitem>
639 <para>Used to create and start a transient .service or a .scope unit
640 and run the specified command in it</para>
641 <indexterm zone="ch-system-systemd systemd-run">
642 <primary sortas="b-systemd-run">systemd-run</primary>
643 </indexterm>
644 </listitem>
645 </varlistentry>
646
647 <!-- <varlistentry id="systemd-stdio-bridge">
648 <term><command>systemd-stdio-bridge</command></term>
649 <listitem>
650 <para>To be completed</para>
651 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
652 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
653 </indexterm>
654 </listitem>
655 </varlistentry> -->
656
657 <varlistentry id="systemd-socket-activate">
658 <term><command>systemd-socket-activate</command></term>
659 <listitem>
660 <para>is a tool to listen on socket devices and launch a process upon
661 connection.</para>
662 <indexterm zone="ch-system-systemd systemd-socket-activate">
663 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
664 </indexterm>
665 </listitem>
666 </varlistentry>
667
668 <varlistentry id="systemd-tmpfiles">
669 <term><command>systemd-tmpfiles</command></term>
670 <listitem>
671 <para>Creates, deletes and cleans up volatile and temporary files and
672 directories, based on the configuration file format and location
673 specified in
674 <filename class="directory">tmpfiles.d</filename> directories</para>
675 <indexterm zone="ch-system-systemd systemd-tmpfiles">
676 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
677 </indexterm>
678 </listitem>
679 </varlistentry>
680
681 <varlistentry id="systemd-tty-ask-password-agent">
682 <term><command>systemd-tty-ask-password-agent</command></term>
683 <listitem>
684 <para>Used to list or process pending systemd password requests</para>
685 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
686 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
687 </indexterm>
688 </listitem>
689 </varlistentry>
690
691 <varlistentry id="telinit">
692 <term><command>telinit</command></term>
693 <listitem>
694 <para>Tells <command>init</command> which run-level to change
695 to</para>
696 <indexterm zone="ch-system-systemd telinit">
697 <primary sortas="b-telinit">telinit</primary>
698 </indexterm>
699 </listitem>
700 </varlistentry>
701
702 <varlistentry id="timedatectl">
703 <term><command>timedatectl</command></term>
704 <listitem>
705 <para>Used to query and change the system clock and its settings
706 </para>
707 <indexterm zone="ch-system-systemd timedatectl">
708 <primary sortas="b-timedatectl">timedatectl</primary>
709 </indexterm>
710 </listitem>
711 </varlistentry>
712
713 <varlistentry id="udevadm">
714 <term><command>udevadm</command></term>
715 <listitem>
716 <para>Generic Udev administration tool: controls the udevd daemon,
717 provides info from the Udev database, monitors uevents, waits for
718 uevents to finish, tests Udev configuration, and triggers uevents
719 for a given device</para>
720 <indexterm zone="ch-system-systemd udevadm">
721 <primary sortas="b-udevadm">udevadm</primary>
722 </indexterm>
723 </listitem>
724 </varlistentry>
725
726 <varlistentry id="libsystemd">
727 <term><filename class="libraryfile">libsystemd</filename></term>
728 <listitem>
729 <para>systemd utility library</para>
730 <indexterm zone="ch-system-systemd libsystemd">
731 <primary sortas="c-libsystemd">libsystemd</primary>
732 </indexterm>
733 </listitem>
734 </varlistentry>
735
736 <varlistentry id="libudev">
737 <term><filename class="libraryfile">libudev</filename></term>
738 <listitem>
739 <para>A library to access Udev device information</para>
740 <indexterm zone="ch-system-systemd libudev">
741 <primary sortas="c-libudev">libudev</primary>
742 </indexterm>
743 </listitem>
744 </varlistentry>
745
746 </variablelist>
747
748 </sect2>
749
750</sect1>
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