source: chapter06/systemd.xml@ 7d7381f

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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"
84GPERF_LEN_TYPE=size_t
85XSLTPROC="/usr/bin/xsltproc"</literal>
86EOF</userinput></screen>
87
88 <para>LTO is disabled by default because it causes
89 <command>systemd</command> and other auxiliary programs to link to
90 <filename class="libraryfile">libgcc_s.so</filename>, slows the build down
91 and makes the compiled code larger.</para>
92
93 <para>Prepare systemd for compilation:</para>
94
95<screen><userinput remap="configure">./configure --prefix=/usr \
96 --sysconfdir=/etc \
97 --localstatedir=/var \
98 --config-cache \
99 --with-rootprefix= \
100 --with-rootlibdir=/lib \
101 --enable-split-usr \
102 --disable-firstboot \
103 --disable-ldconfig \
104 --disable-sysusers \
105 --without-python \
106 --with-default-dnssec=no \
107 --docdir=/usr/share/doc/systemd-&systemd-version;</userinput></screen>
108
109 <variablelist>
110 <title>The meaning of the configure options:</title>
111
112 <varlistentry>
113 <term><parameter>--config-cache</parameter></term>
114 <listitem>
115 <para>This switch tells the build system to use
116 the <filename>config.cache</filename> file which
117 was created earlier.</para>
118 </listitem>
119 </varlistentry>
120
121 <varlistentry>
122 <term><parameter>--with-root*</parameter></term>
123 <listitem>
124 <para>These switches ensure that core programs and
125 shared libraries are installed in the subdirectories
126 of the root partition.</para>
127 </listitem>
128 </varlistentry>
129
130 <varlistentry>
131 <term><parameter>--enable-split-usr</parameter></term>
132 <listitem>
133 <para>This switch ensures that systemd will work on
134 systems where /bin, /lib and /sbin directories are not
135 symlinks to their /usr counterparts.</para>
136 </listitem>
137 </varlistentry>
138
139 <varlistentry>
140 <term><parameter>--without-python</parameter></term>
141 <listitem>
142 <para>This switch prevents <command>configure</command>
143 from trying to use Python which isn't built
144 in LFS.</para>
145 </listitem>
146 </varlistentry>
147
148 <varlistentry>
149 <term><parameter>--disable-firstboot</parameter></term>
150 <listitem>
151 <para>This switch prevents installation of systemd
152 services responsible for setting up the system for
153 the first time. They are not useful for LFS because
154 everything is done manually.</para>
155 </listitem>
156 </varlistentry>
157
158 <varlistentry>
159 <term><parameter>--disable-ldconfig</parameter></term>
160 <listitem>
161 <para>This switch prevents installation of a systemd
162 unit that runs <command>ldconfig</command> at
163 boot, making the boot time longer. Remove it if the
164 described feature is desired, even though it's not
165 useful for source distributions such as LFS.</para>
166 </listitem>
167 </varlistentry>
168
169 <varlistentry>
170 <term><parameter>--disable-sysusers</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 early in this chapter.</para>
177 </listitem>
178 </varlistentry>
179
180 <varlistentry>
181 <term><parameter>--with-default-dnssec=no</parameter></term>
182 <listitem>
183 <para>This switch turns off the experimental DNSSEC support.</para>
184 </listitem>
185 </varlistentry>
186
187 </variablelist>
188
189 <para>Compile the package:</para>
190
191<screen><userinput remap="make">make</userinput></screen>
192
193 <para>This package has a test suite, but it can only be run after the
194 package has been installed.</para>
195
196 <para>Install the package:</para>
197
198<screen><userinput remap="install">make install</userinput></screen>
199
200<!-- These get installed into /lib now by default.
201 <para>Move the NSS libraries to <filename class="directory">/lib</filename>:</para>
202
203<screen><userinput remap="install">mv -v /usr/lib/libnss_{myhostname,mymachines,resolve}.so.2 /lib</userinput></screen>
204-->
205
206 <para>Remove an unnecessary directory:</para>
207
208<screen><userinput remap="install">rm -rfv /usr/lib/rpm</userinput></screen>
209
210 <para>Create the Sysvinit compatibility symlinks, so systemd is used
211 as the default init system:</para>
212
213<screen><userinput remap="install">for tool in runlevel reboot shutdown poweroff halt telinit; do
214 ln -sfv ../bin/systemctl /sbin/${tool}
215done
216ln -sfv ../lib/systemd/systemd /sbin/init</userinput></screen>
217
218<!--
219 <para>Remove a reference to a non-existent group:</para>
220
221<screen><userinput remap="install">sed -i "s:0775 root lock:0755 root root:g" /usr/lib/tmpfiles.d/legacy.conf</userinput></screen>
222-->
223
224 <para>Create the <filename>/etc/machine-id</filename> file needed by
225 <command>systemd-journald</command>:</para>
226
227<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
228
229 <para>Since the testsuite largely depends on the host system kernel
230 configuration, some tests may fail. It also needs a modification in
231 order not to look for a program that will be installed by Util-Linux
232 package later in this chapter. To test the results, issue:</para>
233
234<screen><userinput remap="test">sed -i "s:minix:ext4:g" src/test/test-path-util.c
235make -k check</userinput></screen>
236
237 </sect2>
238
239 <sect2 id="contents-systemd" role="content">
240 <title>Contents of systemd</title>
241
242 <segmentedlist>
243 <segtitle>Installed programs</segtitle>
244 <segtitle>Installed libraries</segtitle>
245 <segtitle>Installed directories</segtitle>
246
247 <seglistitem>
248 <seg>bootctl, busctl, coredumpctl, halt, hostnamectl, init, journalctl,
249 kernel-install, localectl, loginctl, machinectl, networkctl, poweroff,
250 reboot, runlevel, shutdown, systemctl, systemd-analyze,
251 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
252 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
253 systemd-inhibit, systemd-machine-id-setup, systemd-mount,
254 systemd-notify, systemd-nspawn, systemd-path, systemd-resolve,
255 systemd-run, systemd-socket-activate,
256 systemd-stdio-bridge, systemd-tmpfiles, systemd-tty-ask-password-agent,
257 telinit, timedatectl, and udevadm</seg>
258 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
259 libnss_resolve.so.2, libnss_systemd.so.2,
260 libsystemd.so, libsystemd-shared-231.so,
261 and libudev.so</seg>
262 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
263 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
264 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
265 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
266 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
267 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
268 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
269 </seglistitem>
270 </segmentedlist>
271
272 <variablelist>
273 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
274 <?dbfo list-presentation="list"?>
275 <?dbhtml list-presentation="table"?>
276
277 <varlistentry id="bootctl">
278 <term><command>bootctl</command></term>
279 <listitem>
280 <para>used to query the firmware and boot manager settings</para>
281 <indexterm zone="ch-system-systemd bootctl">
282 <primary sortas="b-bootctl">bootctl</primary>
283 </indexterm>
284 </listitem>
285 </varlistentry>
286
287 <varlistentry id="busctl">
288 <term><command>busctl</command></term>
289 <listitem>
290 <para>Used to introspect and monitor the D-Bus bus</para>
291 <indexterm zone="ch-system-systemd busctl">
292 <primary sortas="b-busctl">busctl</primary>
293 </indexterm>
294 </listitem>
295 </varlistentry>
296
297 <varlistentry id="coredumpctl">
298 <term><command>coredumpctl</command></term>
299 <listitem>
300 <para>Used to retrieve coredumps from the systemd Journal</para>
301 <indexterm zone="ch-system-systemd coredumpctl">
302 <primary sortas="b-coredumpctl">coredumpctl</primary>
303 </indexterm>
304 </listitem>
305 </varlistentry>
306
307 <varlistentry id="halt">
308 <term><command>halt</command></term>
309 <listitem>
310 <para>Normally invokes <command>shutdown</command> with the
311 <parameter>-h</parameter> option, except when already in run-level 0,
312 then it tells the kernel to halt the system; it notes in the
313 file <filename>/var/log/wtmp</filename> that the system is being
314 brought down</para>
315 <indexterm zone="ch-system-systemd halt">
316 <primary sortas="b-halt">halt</primary>
317 </indexterm>
318 </listitem>
319 </varlistentry>
320
321 <varlistentry id="hostnamectl">
322 <term><command>hostnamectl</command></term>
323 <listitem>
324 <para>Used to query and change the system hostname and related
325 settings</para>
326 <indexterm zone="ch-system-systemd hostnamectl">
327 <primary sortas="b-hostnamectl">hostnamectl</primary>
328 </indexterm>
329 </listitem>
330 </varlistentry>
331
332 <varlistentry id="init">
333 <term><command>init</command></term>
334 <listitem>
335 <para>The first process to be started when the kernel has initialized
336 the hardware which takes over the boot process and starts all the
337 proceses it is instructed to</para>
338 <indexterm zone="ch-system-systemd init">
339 <primary sortas="b-init">init</primary>
340 </indexterm>
341 </listitem>
342 </varlistentry>
343
344 <varlistentry id="journalctl">
345 <term><command>journalctl</command></term>
346 <listitem>
347 <para>Used to query the contents of the systemd Journal</para>
348 <indexterm zone="ch-system-systemd journalctl">
349 <primary sortas="b-journalctl">journalctl</primary>
350 </indexterm>
351 </listitem>
352 </varlistentry>
353
354 <varlistentry id="kernel-install">
355 <term><command>kernel-install</command></term>
356 <listitem>
357 <para>Used to add and remove kernel and initramfs images to and
358 from /boot</para>
359 <indexterm zone="ch-system-systemd kernel-install">
360 <primary sortas="b-kernel-install">kernel-install</primary>
361 </indexterm>
362 </listitem>
363 </varlistentry>
364
365 <varlistentry id="localectl">
366 <term><command>localectl</command></term>
367 <listitem>
368 <para>Used to query and change the system locale and keyboard layout
369 settings</para>
370 <indexterm zone="ch-system-systemd localectl">
371 <primary sortas="b-localectl">localectl</primary>
372 </indexterm>
373 </listitem>
374 </varlistentry>
375
376 <varlistentry id="loginctl">
377 <term><command>loginctl</command></term>
378 <listitem>
379 <para>Used to introspect and control the state of the systemd Login
380 Manager</para>
381 <indexterm zone="ch-system-systemd loginctl">
382 <primary sortas="b-loginctl">loginctl</primary>
383 </indexterm>
384 </listitem>
385 </varlistentry>
386
387 <varlistentry id="machinectl">
388 <term><command>machinectl</command></term>
389 <listitem>
390 <para>Used to introspect and control the state of the systemd Virtual
391 Machine and Container Registration Manager</para>
392 <indexterm zone="ch-system-systemd machinectl">
393 <primary sortas="b-machinectl">machinectl</primary>
394 </indexterm>
395 </listitem>
396 </varlistentry>
397
398 <varlistentry id="networkctl">
399 <term><command>networkctl</command></term>
400 <listitem>
401 <para>Used to introspect the state of the network links as seen by
402 systemd-networkd</para>
403 <indexterm zone="ch-system-systemd networkctl">
404 <primary sortas="b-networkctl">networkctl</primary>
405 </indexterm>
406 </listitem>
407 </varlistentry>
408
409 <varlistentry id="poweroff">
410 <term><command>poweroff</command></term>
411 <listitem>
412 <para>Tells the kernel to halt the system and switch off the computer
413 (see <command>halt</command>)</para>
414 <indexterm zone="ch-system-systemd poweroff">
415 <primary sortas="b-poweroff">poweroff</primary>
416 </indexterm>
417 </listitem>
418 </varlistentry>
419
420 <varlistentry id="reboot">
421 <term><command>reboot</command></term>
422 <listitem>
423 <para>Tells the kernel to reboot the system (see
424 <command>halt</command>)</para>
425 <indexterm zone="ch-system-systemd reboot">
426 <primary sortas="b-reboot">reboot</primary>
427 </indexterm>
428 </listitem>
429 </varlistentry>
430
431 <varlistentry id="runlevel">
432 <term><command>runlevel</command></term>
433 <listitem>
434 <para>Reports the previous and the current run-level, as noted in the
435 last run-level record in <filename>/var/run/utmp</filename></para>
436 <indexterm zone="ch-system-systemd runlevel">
437 <primary sortas="b-runlevel">runlevel</primary>
438 </indexterm>
439 </listitem>
440 </varlistentry>
441
442 <varlistentry id="shutdown">
443 <term><command>shutdown</command></term>
444 <listitem>
445 <para>Brings the system down in a secure way, signaling all processes
446 and notifying all logged-in users</para>
447 <indexterm zone="ch-system-systemd shutdown">
448 <primary sortas="b-shutdown">shutdown</primary>
449 </indexterm>
450 </listitem>
451 </varlistentry>
452
453 <varlistentry id="systemctl">
454 <term><command>systemctl</command></term>
455 <listitem>
456 <para>Used to introspect and control the state of the systemd system
457 and service manager</para>
458 <indexterm zone="ch-system-systemd systemctl">
459 <primary sortas="b-systemctl">systemctl</primary>
460 </indexterm>
461 </listitem>
462 </varlistentry>
463
464 <varlistentry id="systemd-analyze">
465 <term><command>systemd-analyze</command></term>
466 <listitem>
467 <para>Used to determine system boot-up performance of the current
468 boot</para>
469 <indexterm zone="ch-system-systemd systemd-analyze">
470 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
471 </indexterm>
472 </listitem>
473 </varlistentry>
474
475 <varlistentry id="systemd-ask-password">
476 <term><command>systemd-ask-password</command></term>
477 <listitem>
478 <para>Used to query a system password or passphrase from the user,
479 using a question message specified on the command line</para>
480 <indexterm zone="ch-system-systemd systemd-ask-password">
481 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
482 </indexterm>
483 </listitem>
484 </varlistentry>
485
486 <varlistentry id="systemd-cat">
487 <term><command>systemd-cat</command></term>
488 <listitem>
489 <para>Used to connect STDOUT and STDERR of a process with the Journal
490 </para>
491 <indexterm zone="ch-system-systemd systemd-cat">
492 <primary sortas="b-systemd-cat">systemd-cat</primary>
493 </indexterm>
494 </listitem>
495 </varlistentry>
496
497 <varlistentry id="systemd-cgls">
498 <term><command>systemd-cgls</command></term>
499 <listitem>
500 <para>Recursively shows the contents of the selected Linux control
501 group hierarchy in a tree</para>
502 <indexterm zone="ch-system-systemd systemd-cgls">
503 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
504 </indexterm>
505 </listitem>
506 </varlistentry>
507
508 <varlistentry id="systemd-cgtop">
509 <term><command>systemd-cgtop</command></term>
510 <listitem>
511 <para>Shows the top control groups of the local Linux control group
512 hierarchy, ordered by their CPU, memory and disk I/O load</para>
513 <indexterm zone="ch-system-systemd systemd-cgtop">
514 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
515 </indexterm>
516 </listitem>
517 </varlistentry>
518
519 <varlistentry id="systemd-delta">
520 <term><command>systemd-delta</command></term>
521 <listitem>
522 <para>Used to identify and compare configuration files in
523 <filename class="directory">/etc</filename> that override default
524 counterparts in <filename class="directory">/usr</filename></para>
525 <indexterm zone="ch-system-systemd systemd-delta">
526 <primary sortas="b-systemd-delta">systemd-delta</primary>
527 </indexterm>
528 </listitem>
529 </varlistentry>
530
531 <varlistentry id="systemd-detect-virt">
532 <term><command>systemd-detect-virt</command></term>
533 <listitem>
534 <para>Detects execution in a virtualized environment</para>
535 <indexterm zone="ch-system-systemd systemd-detect-virt">
536 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
537 </indexterm>
538 </listitem>
539 </varlistentry>
540
541 <varlistentry id="systemd-escape">
542 <term><command>systemd-escape</command></term>
543 <listitem>
544 <para>Used to escape strings for inclusion in systemd unit
545 names</para>
546 <indexterm zone="ch-system-systemd systemd-escape">
547 <primary sortas="b-systemd-escape">systemd-escape</primary>
548 </indexterm>
549 </listitem>
550 </varlistentry>
551
552 <varlistentry id="systemd-hwdb">
553 <term><command>systemd-hwdb</command></term>
554 <listitem>
555 <para>Used to manage hardware database (hwdb)</para>
556 <indexterm zone="ch-system-systemd systemd-hwdb">
557 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
558 </indexterm>
559 </listitem>
560 </varlistentry>
561
562 <varlistentry id="systemd-inhibit">
563 <term><command>systemd-inhibit</command></term>
564 <listitem>
565 <para>Used to execute a program with a shutdown, sleep or idle
566 inhibitor lock taken</para>
567 <indexterm zone="ch-system-systemd systemd-inhibit">
568 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
569 </indexterm>
570 </listitem>
571 </varlistentry>
572
573 <varlistentry id="systemd-machine-id-setup">
574 <term><command>systemd-machine-id-setup</command></term>
575 <listitem>
576 <para>Used by system installer tools to initialize the machine ID
577 stored in <filename>/etc/machine-id</filename> at install time with a
578 randomly generated ID</para>
579 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
580 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
581 </indexterm>
582 </listitem>
583 </varlistentry>
584
585 <varlistentry id="systemd-mount">
586 <term><command>systemd-mount</command></term>
587 <listitem>
588 <para>is a tool to temporarily mount or auto-mount a drive.</para>
589 <indexterm zone="ch-system-systemd systemd-mount">
590 <primary sortas="b-systemd-mount">systemd-mount</primary>
591 </indexterm>
592 </listitem>
593 </varlistentry>
594
595 <varlistentry id="systemd-notify">
596 <term><command>systemd-notify</command></term>
597 <listitem>
598 <para>Used by daemon scripts to notify the init system about status
599 changes</para>
600 <indexterm zone="ch-system-systemd systemd-notify">
601 <primary sortas="b-systemd-notify">systemd-notify</primary>
602 </indexterm>
603 </listitem>
604 </varlistentry>
605
606 <varlistentry id="systemd-nspawn">
607 <term><command>systemd-nspawn</command></term>
608 <listitem>
609 <para>Used to run a command or OS in a light-weight namespace
610 container</para>
611 <indexterm zone="ch-system-systemd systemd-nspawn">
612 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
613 </indexterm>
614 </listitem>
615 </varlistentry>
616
617 <varlistentry id="systemd-path">
618 <term><command>systemd-path</command></term>
619 <listitem>
620 <para>Used to query system and user paths</para>
621 <indexterm zone="ch-system-systemd systemd-path">
622 <primary sortas="b-systemd-path">systemd-path</primary>
623 </indexterm>
624 </listitem>
625 </varlistentry>
626
627 <varlistentry id="systemd-resolve">
628 <term><command>systemd-resolve</command></term>
629 <listitem>
630 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
631 resource records, and services</para>
632 <indexterm zone="ch-system-systemd systemd-resolve">
633 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
634 </indexterm>
635 </listitem>
636 </varlistentry>
637
638 <varlistentry id="systemd-run">
639 <term><command>systemd-run</command></term>
640 <listitem>
641 <para>Used to create and start a transient .service or a .scope unit
642 and run the specified command in it</para>
643 <indexterm zone="ch-system-systemd systemd-run">
644 <primary sortas="b-systemd-run">systemd-run</primary>
645 </indexterm>
646 </listitem>
647 </varlistentry>
648
649 <!-- <varlistentry id="systemd-stdio-bridge">
650 <term><command>systemd-stdio-bridge</command></term>
651 <listitem>
652 <para>To be completed</para>
653 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
654 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
655 </indexterm>
656 </listitem>
657 </varlistentry> -->
658
659 <varlistentry id="systemd-socket-activate">
660 <term><command>systemd-socket-activate</command></term>
661 <listitem>
662 <para>is a tool to listen on socket devices and launch a process upon
663 connection.</para>
664 <indexterm zone="ch-system-systemd systemd-socket-activate">
665 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
666 </indexterm>
667 </listitem>
668 </varlistentry>
669
670 <varlistentry id="systemd-tmpfiles">
671 <term><command>systemd-tmpfiles</command></term>
672 <listitem>
673 <para>Creates, deletes and cleans up volatile and temporary files and
674 directories, based on the configuration file format and location
675 specified in
676 <filename class="directory">tmpfiles.d</filename> directories</para>
677 <indexterm zone="ch-system-systemd systemd-tmpfiles">
678 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
679 </indexterm>
680 </listitem>
681 </varlistentry>
682
683 <varlistentry id="systemd-tty-ask-password-agent">
684 <term><command>systemd-tty-ask-password-agent</command></term>
685 <listitem>
686 <para>Used to list or process pending systemd password requests</para>
687 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
688 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
689 </indexterm>
690 </listitem>
691 </varlistentry>
692
693 <varlistentry id="telinit">
694 <term><command>telinit</command></term>
695 <listitem>
696 <para>Tells <command>init</command> which run-level to change
697 to</para>
698 <indexterm zone="ch-system-systemd telinit">
699 <primary sortas="b-telinit">telinit</primary>
700 </indexterm>
701 </listitem>
702 </varlistentry>
703
704 <varlistentry id="timedatectl">
705 <term><command>timedatectl</command></term>
706 <listitem>
707 <para>Used to query and change the system clock and its settings
708 </para>
709 <indexterm zone="ch-system-systemd timedatectl">
710 <primary sortas="b-timedatectl">timedatectl</primary>
711 </indexterm>
712 </listitem>
713 </varlistentry>
714
715 <varlistentry id="udevadm">
716 <term><command>udevadm</command></term>
717 <listitem>
718 <para>Generic Udev administration tool: controls the udevd daemon,
719 provides info from the Udev database, monitors uevents, waits for
720 uevents to finish, tests Udev configuration, and triggers uevents
721 for a given device</para>
722 <indexterm zone="ch-system-systemd udevadm">
723 <primary sortas="b-udevadm">udevadm</primary>
724 </indexterm>
725 </listitem>
726 </varlistentry>
727
728 <varlistentry id="libsystemd">
729 <term><filename class="libraryfile">libsystemd</filename></term>
730 <listitem>
731 <para>systemd utility library</para>
732 <indexterm zone="ch-system-systemd libsystemd">
733 <primary sortas="c-libsystemd">libsystemd</primary>
734 </indexterm>
735 </listitem>
736 </varlistentry>
737
738 <varlistentry id="libudev">
739 <term><filename class="libraryfile">libudev</filename></term>
740 <listitem>
741 <para>A library to access Udev device information</para>
742 <indexterm zone="ch-system-systemd libudev">
743 <primary sortas="c-libudev">libudev</primary>
744 </indexterm>
745 </listitem>
746 </varlistentry>
747
748 </variablelist>
749
750 </sect2>
751
752</sect1>
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