source: chapter08/systemd.xml@ b1169eb

multilib xry111/multilib
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1<?xml version="1.0" encoding="UTF-8"?>
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-fin-sbu;</seg>
35 <seg>&systemd-fin-du;</seg>
36 </seglistitem>
37 </segmentedlist>
38 </sect2>
39
40 <sect2 role="installation">
41 <title>Installation of systemd</title>
42
43 <para>Remove two unneeded groups,
44 <systemitem class="groupname">render</systemitem> and
45 <systemitem class="groupname">sgx</systemitem>, from the default udev
46 rules:</para>
47
48 <screen><userinput remap="pre">sed -i -e 's/GROUP="render"/GROUP="video"/' \
49 -e 's/GROUP="sgx", //' rules.d/50-udev-default.rules.in</userinput></screen>
50
51 <para>Prepare systemd for compilation:</para>
52
53<screen><userinput remap="configure">mkdir -p build
54cd build
55
56meson setup .. \
57 --prefix=/usr \
58 --buildtype=release \
59 -D default-dnssec=no \
60 -D firstboot=false \
61 -D install-tests=false \
62 -D ldconfig=false \
63 -D sysusers=false \
64 -D rpmmacrosdir=no \
65 -D homed=disabled \
66 -D userdb=false \
67 -D man=disabled \
68 -D mode=release \
69 -D pamconfdir=no \
70 -D dev-kvm-mode=0660 \
71 -D nobody-group=nogroup \
72 -D sysupdate=disabled \
73 -D ukify=disabled \
74 -D docdir=/usr/share/doc/systemd-&systemd-version;</userinput></screen>
75
76 <variablelist>
77 <title>The meaning of the meson options:</title>
78
79 <varlistentry>
80 <term><parameter>--buildtype=release</parameter></term>
81 <listitem>
82 <para>This switch overrides the default buildtype
83 (<quote>debug</quote>), which produces unoptimized
84 binaries.</para>
85 </listitem>
86 </varlistentry>
87
88 <varlistentry>
89 <term><parameter>-D default-dnssec=no</parameter></term>
90 <listitem>
91 <para>This switch turns off the experimental DNSSEC support.</para>
92 </listitem>
93 </varlistentry>
94
95 <varlistentry>
96 <term><parameter>-D firstboot=false</parameter></term>
97 <listitem>
98 <para>This switch prevents installation of systemd
99 services responsible for setting up the system for
100 the first time. These are not useful in LFS, because
101 everything is done manually.</para>
102 </listitem>
103 </varlistentry>
104
105 <varlistentry>
106 <term><parameter>-D install-tests=false</parameter></term>
107 <listitem>
108 <para>This switch prevents installation of the compiled tests.</para>
109 </listitem>
110 </varlistentry>
111
112 <varlistentry>
113 <term><parameter>-D ldconfig=false</parameter></term>
114 <listitem>
115 <para>This switch prevents installation of a systemd unit that runs
116 <command>ldconfig</command> at boot; this is not useful for source
117 distributions such as LFS, and makes the boot time longer. Remove
118 this option to enable running <command>ldconfig</command> at boot.</para>
119 </listitem>
120 </varlistentry>
121
122 <varlistentry>
123 <term><parameter>-D sysusers=false</parameter></term>
124 <listitem>
125 <para>This switch prevents installation of systemd
126 services responsible for setting up the
127 <filename>/etc/group</filename> and
128 <filename>/etc/passwd</filename> files. Both files
129 were created in the previous chapter. This daemon is not useful
130 on an LFS system since user accounts are manually created.</para>
131 </listitem>
132 </varlistentry>
133
134 <varlistentry>
135 <term><parameter>-D rpmmacrosdir=no</parameter></term>
136 <listitem>
137 <para>This switch disables installation of RPM Macros
138 for use with systemd, because LFS does not support RPM.</para>
139 </listitem>
140 </varlistentry>
141
142 <varlistentry>
143 <term><parameter>-D homed=disabled</parameter> and
144 <parameter>-D userdb=false</parameter></term>
145 <listitem>
146 <para>Remove two daemons with dependencies that do not fit
147 within the scope of LFS.</para>
148 </listitem>
149 </varlistentry>
150
151 <varlistentry>
152 <term><parameter>-D man=disabled</parameter></term>
153 <listitem>
154 <para>Prevent the generation of man pages to avoid extra
155 dependencies. We will install pre-generated man pages for systemd
156 from a tarball.</para>
157 </listitem>
158 </varlistentry>
159
160 <varlistentry>
161 <term><parameter>-D mode=release</parameter></term>
162 <listitem>
163 <para>Disable some features considered experimental by upstream.
164 </para>
165 </listitem>
166 </varlistentry>
167
168 <varlistentry>
169 <term><parameter>-D pamconfdir=no</parameter></term>
170 <listitem>
171 <para>Prevent the installation of a PAM configuration file not
172 functional on LFS.</para>
173 </listitem>
174 </varlistentry>
175
176 <varlistentry>
177 <term><parameter>-D dev-kvm-mode=0660</parameter></term>
178 <listitem>
179 <para>The default udev rule would allow all users to access
180 <filename class='devicefile'>/dev/kvm</filename>. The editors
181 consider it dangerous. This option overrides it.</para>
182 </listitem>
183 </varlistentry>
184
185 <varlistentry>
186 <term><parameter>-D nobody-group=nogroup</parameter></term>
187 <listitem>
188 <para>Tell the package the group name with GID 65534 is
189 <systemitem class='groupname'>nogroup</systemitem>.</para>
190 </listitem>
191 </varlistentry>
192
193 <varlistentry>
194 <term><parameter>-D sysupdate=disabled</parameter></term>
195 <listitem>
196 <para>Do not install the <command>systemd-sysupdate</command>
197 tool. It's designed for automatically upgrading binary distros,
198 so it's useless for a basic Linux system built from source.
199 And it will report errors on boot if it's enabled but not properly
200 configured.</para>
201 </listitem>
202 </varlistentry>
203
204 <varlistentry>
205 <term><parameter>-D ukify=disabled</parameter></term>
206 <listitem>
207 <para>Do not install the <command>systemd-ukify</command> script.
208 At runtime this script requires the
209 <application>pefile</application> Python module that neither LFS
210 nor BLFS provides.</para>
211 </listitem>
212 </varlistentry>
213
214 </variablelist>
215
216 <para>Compile the package:</para>
217
218<screen><userinput remap="make">ninja</userinput></screen>
219
220 <para>Some tests need a basic <filename>/etc/os-release</filename> file.
221 To test the results, issue:</para>
222
223<screen><userinput remap="test">echo 'NAME="Linux From Scratch"' &gt; /etc/os-release
224ninja test</userinput></screen>
225
226 <!-- test-namespace needs /run/systemd/inaccessible/sock, which only exists
227 after initializing the system with systemd. -->
228 <para>One test named <literal>systemd:core / test-namespace</literal>
229 is known to fail in the LFS chroot environment. Some other tests may
230 fail because they depend on various kernel configuration options.</para>
231
232 <para>Install the package:</para>
233
234<screen><userinput remap="install">ninja install</userinput></screen>
235
236 <para>Install the man pages:</para>
237
238 <!-- Please make sure systemd man pages tarball has a common leading
239 component in the path. -->
240<screen><userinput remap="install">tar -xf ../../systemd-man-pages-&systemd-man-version;.tar.xz \
241 --no-same-owner --strip-components=1 \
242 -C /usr/share/man</userinput></screen>
243
244 <para>Create the <filename>/etc/machine-id</filename> file needed by
245 <command>systemd-journald</command>:</para>
246
247<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
248
249 <para>Set up the basic target structure:</para>
250
251<screen><userinput remap="adjust">systemctl preset-all</userinput></screen>
252
253<!-- dev: 50-pid-max.conf is not removed in BLFS, so I commented the following out.
254 If it causes any trouble, we can add this back and also copy it into BLFS -->
255<!--
256 <para>Prevent systemd from resetting the maximum PID value which causes
257 some problems with packages and units in BLFS:</para>
258
259<screen><userinput remap="adjust">rm -f /usr/lib/sysctl.d/50-pid-max.conf</userinput></screen>
260-->
261
262 </sect2>
263
264 <!-- - - - - - - - - - -->
265 <!-- Multilib - 32bit -->
266 <!-- - - - - - - - - - -->
267
268 <sect2 arch="ml_32,ml_all" role="installation">
269 <title>Installation of systemd - 32-bit</title>
270
271 <para>Clean previous build:</para>
272
273<screen><userinput remap="pre">rm -rf *</userinput></screen>
274
275 <para>Create a symlink to work around missing xsltproc:</para>
276
277<!-- screen><userinput remap="pre">ln -sf /tools/bin/true /usr/bin/xsltproc</userinput></screen -->
278<screen><userinput remap="pre">ln -sf /bin/true /usr/bin/xsltproc</userinput></screen>
279
280<!-- with cross-LFS we have util-linux in place:
281 <para>Because we have not yet installed the final version of Util-Linux,
282 create links to the libraries in the approprite location:</para>
283
284<screen><userinput remap="pre">for file in /tools/lib32/lib{blkid,mount,uuid}*; do
285 ln -sf $file /usr/lib32/
286done</userinput></screen>
287-->
288
289 <para>Prepare systemd for compilation:</para>
290
291 <screen><userinput remap="configure">PKG_CONFIG_PATH="/usr/lib32/pkgconfig" \
292CC="gcc -m32 -march=i686" \
293CXX="g++ -m32 -march=i686" \
294LANG=en_US.UTF-8 \
295meson --prefix=/usr \
296 --sysconfdir=/etc \
297 --localstatedir=/var \
298 --libdir=/usr/lib32 \
299 -Drootlibdir=/usr/lib32 \
300 -Dblkid=true \
301 -Ddefault-dnssec=no \
302 -Dfirstboot=false \
303 -Dinstall-tests=false \
304 -Dldconfig=false \
305 -Dsysusers=false \
306 -Db_lto=false \
307 -Drpmmacrosdir=no \
308 -Dhomed=false \
309 -Duserdb=false \
310 -Dman=false \
311 -Dmode=release \
312 ..</userinput></screen>
313
314 <para>Compile the package:</para>
315
316<screen><userinput remap="make">LANG=en_US.UTF-8 ninja</userinput></screen>
317
318 <para>Install the package:</para>
319
320<screen><userinput remap="install">LANG=en_US.UTF-8 DESTDIR=$PWD/DESTDIR ninja install
321cp -Rv DESTDIR/usr/lib32/* /usr/lib32
322rm -rf DESTDIR
323rm -f /usr/bin/xsltproc</userinput></screen>
324
325 </sect2><!-- m32 -->
326
327 <!-- - - - - - - - - - -->
328 <!-- Multilib - x32bit -->
329 <!-- - - - - - - - - - -->
330
331 <sect2 arch="ml_x32,ml_all" role="installation">
332 <title>Installation of systemd - x32-bit</title>
333
334 <para>Clean previous build:</para>
335
336<screen><userinput remap="pre">rm -rf *</userinput></screen>
337
338 <para>Create a symlink to work around missing xsltproc:</para>
339
340<screen><userinput remap="pre">ln -sf /bin/true /usr/bin/xsltproc</userinput></screen>
341<!--
342 <para>Fix an issue on x32:</para>
343
344<screen><userinput remap="pre">sed '/log_debug/s@PRI_TIMEX@PRIi64@' -i src/timesync/timesyncd-manager.c
345sed '/long drift_freq;/s@long @int64_t @' -i src/timesync/timesyncd-manager.h</userinput></screen>
346-->
347 <para>Prepare systemd for compilation:</para>
348
349<screen><userinput remap="configure">PKG_CONFIG_PATH="/usr/libx32/pkgconfig" \
350CC="gcc -mx32" \
351CXX="g++ -mx32" \
352CFLAGS+=" -Wno-error=shift-overflow" \
353CXXFLAGS+=" -Wno-error=shift-overflow" \
354LANG=en_US.UTF-8 \
355meson --prefix=/usr \
356 --sysconfdir=/etc \
357 --localstatedir=/var \
358 --libdir=/usr/libx32 \
359 -Drootlibdir=/usr/libx32 \
360 -Dblkid=true \
361 -Ddefault-dnssec=no \
362 -Dfirstboot=false \
363 -Dinstall-tests=false \
364 -Dldconfig=false \
365 -Dsysusers=false \
366 -Db_lto=false \
367 -Drpmmacrosdir=no \
368 -Dhomed=false \
369 -Duserdb=false \
370 -Dman=false \
371 -Dmode=release \
372 ..</userinput></screen>
373
374 <para>Compile the package:</para>
375
376<screen><userinput remap="make">LANG=en_US.UTF-8 ninja</userinput></screen>
377
378 <para>Install the package:</para>
379
380<screen><userinput remap="install">LANG=en_US.UTF-8 DESTDIR=$PWD/DESTDIR ninja install
381cp -Rv DESTDIR/usr/libx32/* /usr/libx32
382rm -rf DESTDIR
383rm -f /usr/bin/xsltproc</userinput></screen>
384
385 </sect2><!-- mx32 -->
386
387 <sect2 id="contents-systemd" role="content">
388 <title>Contents of systemd</title>
389
390 <segmentedlist>
391 <segtitle>Installed programs</segtitle>
392 <segtitle>Installed libraries</segtitle>
393 <segtitle>Installed directories</segtitle>
394
395 <seglistitem>
396 <seg>busctl, coredumpctl, halt (symlink to systemctl),
397 hostnamectl, init, journalctl, kernel-install, localectl, loginctl,
398 machinectl, mount.ddi (symlink to systemd-dissect), networkctl,
399 oomctl, portablectl, poweroff (symlink to
400 systemctl), reboot (symlink to systemctl), resolvconf (symlink to
401 resolvectl), resolvectl, runlevel (symlink to systemctl), shutdown
402 (symlink to systemctl), systemctl, systemd-ac-power, systemd-analyze,
403 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
404 systemd-confext (symlink to systemd-sysext), systemd-creds,
405 systemd-delta, systemd-detect-virt,
406 systemd-dissect, systemd-escape, systemd-hwdb, systemd-id128,
407 systemd-inhibit, systemd-machine-id-setup,
408 systemd-mount, systemd-notify, systemd-nspawn, systemd-path,
409 systemd-repart, systemd-resolve (symlink to resolvectl), systemd-run,
410 systemd-socket-activate, systemd-stdio-bridge, systemd-sysext,
411 systemd-tmpfiles, systemd-tty-ask-password-agent,
412 systemd-umount (symlink to systemd-mount),
413 telinit (symlink to systemctl), timedatectl, and udevadm</seg>
414 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
415 libnss_resolve.so.2, libnss_systemd.so.2,
416 libsystemd.so, libsystemd-shared-&systemd-version;.so (in /usr/lib/systemd),
417 and libudev.so</seg>
418 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
419 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
420 /etc/xdg/systemd, /usr/lib/systemd, /usr/lib/udev, /usr/include/systemd,
421 /usr/lib/binfmt.d, /usr/lib/environment.d, /usr/lib/kernel,
422 /usr/lib/modules-load.d, /usr/lib/sysctl.d, /usr/lib/systemd,
423 /usr/lib/tmpfiles.d,
424 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
425 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
426 </seglistitem>
427 </segmentedlist>
428
429 <variablelist>
430 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
431 <?dbfo list-presentation="list"?>
432 <?dbhtml list-presentation="table"?>
433
434 <varlistentry id="busctl">
435 <term><command>busctl</command></term>
436 <listitem>
437 <para>Is used to introspect and monitor the D-Bus bus</para>
438 <indexterm zone="ch-system-systemd busctl">
439 <primary sortas="b-busctl">busctl</primary>
440 </indexterm>
441 </listitem>
442 </varlistentry>
443
444 <varlistentry id="coredumpctl">
445 <term><command>coredumpctl</command></term>
446 <listitem>
447 <para>Is used to retrieve coredumps from the systemd journal</para>
448 <indexterm zone="ch-system-systemd coredumpctl">
449 <primary sortas="b-coredumpctl">coredumpctl</primary>
450 </indexterm>
451 </listitem>
452 </varlistentry>
453
454 <varlistentry id="halt">
455 <term><command>halt</command></term>
456 <listitem>
457 <para>Normally invokes <command>shutdown</command> with the
458 <parameter>-h</parameter> option, except when already in run-level 0,
459 when it tells the kernel to halt the system; it notes in the
460 file <filename>/var/log/wtmp</filename> that the system is being
461 brought down</para>
462 <indexterm zone="ch-system-systemd halt">
463 <primary sortas="b-halt">halt</primary>
464 </indexterm>
465 </listitem>
466 </varlistentry>
467
468 <varlistentry id="hostnamectl">
469 <term><command>hostnamectl</command></term>
470 <listitem>
471 <para>Is used to query and change the system hostname and related
472 settings</para>
473 <indexterm zone="ch-system-systemd hostnamectl">
474 <primary sortas="b-hostnamectl">hostnamectl</primary>
475 </indexterm>
476 </listitem>
477 </varlistentry>
478
479 <varlistentry id="init">
480 <term><command>init</command></term>
481 <listitem>
482 <para>Is the first process to be started after the kernel has initialized
483 the hardware; <command>init</command> takes over the boot process and starts the
484 processes specified by its configuration files; in this case, it starts
485 systemd</para>
486 <indexterm zone="ch-system-systemd init">
487 <primary sortas="b-init">init</primary>
488 </indexterm>
489 </listitem>
490 </varlistentry>
491
492 <varlistentry id="journalctl">
493 <term><command>journalctl</command></term>
494 <listitem>
495 <para>Is used to query the contents of the systemd journal</para>
496 <indexterm zone="ch-system-systemd journalctl">
497 <primary sortas="b-journalctl">journalctl</primary>
498 </indexterm>
499 </listitem>
500 </varlistentry>
501
502 <varlistentry id="kernel-install">
503 <term><command>kernel-install</command></term>
504 <listitem>
505 <para>Is used to add and remove kernel and initramfs images to and
506 from /boot; in LFS, this is done manually</para>
507 <indexterm zone="ch-system-systemd kernel-install">
508 <primary sortas="b-kernel-install">kernel-install</primary>
509 </indexterm>
510 </listitem>
511 </varlistentry>
512
513 <varlistentry id="localectl">
514 <term><command>localectl</command></term>
515 <listitem>
516 <para>Is used to query and change the system locale and keyboard layout
517 settings</para>
518 <indexterm zone="ch-system-systemd localectl">
519 <primary sortas="b-localectl">localectl</primary>
520 </indexterm>
521 </listitem>
522 </varlistentry>
523
524 <varlistentry id="loginctl">
525 <term><command>loginctl</command></term>
526 <listitem>
527 <para>Is used to introspect and control the state of the systemd Login
528 Manager</para>
529 <indexterm zone="ch-system-systemd loginctl">
530 <primary sortas="b-loginctl">loginctl</primary>
531 </indexterm>
532 </listitem>
533 </varlistentry>
534
535 <varlistentry id="machinectl">
536 <term><command>machinectl</command></term>
537 <listitem>
538 <para>Is used to introspect and control the state of the systemd Virtual
539 Machine and Container Registration Manager</para>
540 <indexterm zone="ch-system-systemd machinectl">
541 <primary sortas="b-machinectl">machinectl</primary>
542 </indexterm>
543 </listitem>
544 </varlistentry>
545
546 <varlistentry id="networkctl">
547 <term><command>networkctl</command></term>
548 <listitem>
549 <para>Is used to introspect and configure the state of the network
550 links configured by systemd-networkd</para>
551 <indexterm zone="ch-system-systemd networkctl">
552 <primary sortas="b-networkctl">networkctl</primary>
553 </indexterm>
554 </listitem>
555 </varlistentry>
556
557 <varlistentry id="oomctl">
558 <term><command>oomctl</command></term>
559 <listitem>
560 <para>Controls the systemd Out Of Memory daemon</para>
561 <indexterm zone="ch-system-systemd oomctl">
562 <primary sortas="b-oomctl">oomctl</primary>
563 </indexterm>
564 </listitem>
565 </varlistentry>
566
567 <varlistentry id="portablectl">
568 <term><command>portablectl</command></term>
569 <listitem>
570 <para>Is used to attach or detach portable services from the local
571 system</para>
572 <indexterm zone="ch-system-systemd portablectl">
573 <primary sortas="b-portablectl">portablectl</primary>
574 </indexterm>
575 </listitem>
576 </varlistentry>
577
578 <varlistentry id="poweroff">
579 <term><command>poweroff</command></term>
580 <listitem>
581 <para>Instructs the kernel to halt the system and switch off the computer
582 (see <command>halt</command>)</para>
583 <indexterm zone="ch-system-systemd poweroff">
584 <primary sortas="b-poweroff">poweroff</primary>
585 </indexterm>
586 </listitem>
587 </varlistentry>
588
589 <varlistentry id="reboot">
590 <term><command>reboot</command></term>
591 <listitem>
592 <para>Instructs the kernel to reboot the system (see
593 <command>halt</command>)</para>
594 <indexterm zone="ch-system-systemd reboot">
595 <primary sortas="b-reboot">reboot</primary>
596 </indexterm>
597 </listitem>
598 </varlistentry>
599
600 <varlistentry id="resolvconf">
601 <term><command>resolvconf</command></term>
602 <listitem>
603 <para>Registers DNS server and domain configuration with
604 <command>systemd-resolved</command></para>
605 <indexterm zone="ch-system-systemd resolvconf">
606 <primary sortas="b-resolvconf">resolvconf</primary>
607 </indexterm>
608 </listitem>
609 </varlistentry>
610
611 <varlistentry id="resolvectl">
612 <term><command>resolvectl</command></term>
613 <listitem>
614 <para>Sends control commands to the network name resolution
615 manager, or resolves domain names, IPv4 and IPv6 addresses,
616 DNS records, and services</para>
617 <indexterm zone="ch-system-systemd resolvectl">
618 <primary sortas="b-resolvectl">resolvectl</primary>
619 </indexterm>
620 </listitem>
621 </varlistentry>
622
623 <varlistentry id="runlevel">
624 <term><command>runlevel</command></term>
625 <listitem>
626 <para>Outputs the previous and the current run-level, as noted in the
627 last run-level record in <filename>/run/utmp</filename></para>
628 <indexterm zone="ch-system-systemd runlevel">
629 <primary sortas="b-runlevel">runlevel</primary>
630 </indexterm>
631 </listitem>
632 </varlistentry>
633
634 <varlistentry id="shutdown">
635 <term><command>shutdown</command></term>
636 <listitem>
637 <para>Brings the system down in a safe and secure manner, signaling
638 all processes and notifying all logged-in users</para>
639 <indexterm zone="ch-system-systemd shutdown">
640 <primary sortas="b-shutdown">shutdown</primary>
641 </indexterm>
642 </listitem>
643 </varlistentry>
644
645 <varlistentry id="systemctl">
646 <term><command>systemctl</command></term>
647 <listitem>
648 <para>Is used to introspect and control the state of the systemd system
649 and service manager</para>
650 <indexterm zone="ch-system-systemd systemctl">
651 <primary sortas="b-systemctl">systemctl</primary>
652 </indexterm>
653 </listitem>
654 </varlistentry>
655
656 <varlistentry id="systemd-ac-power">
657 <term><command>systemd-ac-power</command></term>
658 <listitem>
659 <para>Reports whether the system is connected to an external
660 power source.</para>
661 <indexterm zone="ch-system-systemd systemd-ac-power">
662 <primary sortas="b-systemd-ac-power">systemd-ac-power</primary>
663 </indexterm>
664 </listitem>
665 </varlistentry>
666
667 <varlistentry id="systemd-analyze">
668 <term><command>systemd-analyze</command></term>
669 <listitem>
670 <para>Is used to analyze system startup performance,
671 as well as identify troublesome systemd units</para>
672 <indexterm zone="ch-system-systemd systemd-analyze">
673 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
674 </indexterm>
675 </listitem>
676 </varlistentry>
677
678 <varlistentry id="systemd-ask-password">
679 <term><command>systemd-ask-password</command></term>
680 <listitem>
681 <para>Is used to query a system password or passphrase from the user,
682 using a message specified on the Linux command line</para>
683 <indexterm zone="ch-system-systemd systemd-ask-password">
684 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
685 </indexterm>
686 </listitem>
687 </varlistentry>
688
689 <varlistentry id="systemd-cat">
690 <term><command>systemd-cat</command></term>
691 <listitem>
692 <para>Is used to connect the STDOUT and STDERR outputs of a process
693 with the systemd journal
694 </para>
695 <indexterm zone="ch-system-systemd systemd-cat">
696 <primary sortas="b-systemd-cat">systemd-cat</primary>
697 </indexterm>
698 </listitem>
699 </varlistentry>
700
701 <varlistentry id="systemd-cgls">
702 <term><command>systemd-cgls</command></term>
703 <listitem>
704 <para>Recursively shows the contents of the selected Linux control
705 group hierarchy in a tree</para>
706 <indexterm zone="ch-system-systemd systemd-cgls">
707 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
708 </indexterm>
709 </listitem>
710 </varlistentry>
711
712 <varlistentry id="systemd-cgtop">
713 <term><command>systemd-cgtop</command></term>
714 <listitem>
715 <para>Shows the top control groups of the local Linux control group
716 hierarchy, ordered by their CPU, memory and disk I/O loads</para>
717 <indexterm zone="ch-system-systemd systemd-cgtop">
718 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
719 </indexterm>
720 </listitem>
721 </varlistentry>
722
723 <varlistentry id="systemd-creds">
724 <term><command>systemd-creds</command></term>
725 <listitem>
726 <para>Displays and processes credentials</para>
727 <indexterm zone="ch-system-systemd systemd-creds">
728 <primary sortas="b-systemd-creds">systemd-creds</primary>
729 </indexterm>
730 </listitem>
731 </varlistentry>
732
733 <varlistentry id="systemd-delta">
734 <term><command>systemd-delta</command></term>
735 <listitem>
736 <para>Is used to identify and compare configuration files in
737 <filename class="directory">/etc</filename> that override the defaults
738 in <filename class="directory">/usr</filename></para>
739 <indexterm zone="ch-system-systemd systemd-delta">
740 <primary sortas="b-systemd-delta">systemd-delta</primary>
741 </indexterm>
742 </listitem>
743 </varlistentry>
744
745 <varlistentry id="systemd-detect-virt">
746 <term><command>systemd-detect-virt</command></term>
747 <listitem>
748 <para>Detects whether the system is being run in a virtual
749 environment, and adjusts udev accordingly</para>
750 <indexterm zone="ch-system-systemd systemd-detect-virt">
751 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
752 </indexterm>
753 </listitem>
754 </varlistentry>
755
756 <varlistentry id="systemd-dissect">
757 <term><command>systemd-dissect</command></term>
758 <listitem>
759 <para>Is used to inspect OS disk images</para>
760 <indexterm zone="ch-system-systemd systemd-dissect">
761 <primary sortas="b-systemd-dissect">systemd-dissect</primary>
762 </indexterm>
763 </listitem>
764 </varlistentry>
765
766 <varlistentry id="systemd-escape">
767 <term><command>systemd-escape</command></term>
768 <listitem>
769 <para>Is used to escape strings for inclusion in systemd unit
770 names</para>
771 <indexterm zone="ch-system-systemd systemd-escape">
772 <primary sortas="b-systemd-escape">systemd-escape</primary>
773 </indexterm>
774 </listitem>
775 </varlistentry>
776
777 <varlistentry id="systemd-hwdb">
778 <term><command>systemd-hwdb</command></term>
779 <listitem>
780 <para>Is used to manage the hardware database (hwdb)</para>
781 <indexterm zone="ch-system-systemd systemd-hwdb">
782 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
783 </indexterm>
784 </listitem>
785 </varlistentry>
786
787 <varlistentry id="systemd-id128">
788 <term><command>systemd-id128</command></term>
789 <listitem>
790 <para>Generates and prints id128 (UUID) strings</para>
791 <indexterm zone="ch-system-systemd systemd-id128">
792 <primary sortas="b-systemd-id128">systemd-id128</primary>
793 </indexterm>
794 </listitem>
795 </varlistentry>
796
797 <varlistentry id="systemd-inhibit">
798 <term><command>systemd-inhibit</command></term>
799 <listitem>
800 <para>Is used to execute a program with a shutdown, sleep or idle
801 inhibitor lock taken, preventing an action such as a system shutdown
802 until the process is completed</para>
803 <indexterm zone="ch-system-systemd systemd-inhibit">
804 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
805 </indexterm>
806 </listitem>
807 </varlistentry>
808
809 <varlistentry id="systemd-machine-id-setup">
810 <term><command>systemd-machine-id-setup</command></term>
811 <listitem>
812 <para>Is used by system installer tools to initialize the machine ID
813 stored in <filename>/etc/machine-id</filename> at install time with a
814 randomly generated ID</para>
815 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
816 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
817 </indexterm>
818 </listitem>
819 </varlistentry>
820
821 <varlistentry id="systemd-mount">
822 <term><command>systemd-mount</command></term>
823 <listitem>
824 <para>Is used to temporarily mount or automount disks</para>
825 <indexterm zone="ch-system-systemd systemd-mount">
826 <primary sortas="b-systemd-mount">systemd-mount</primary>
827 </indexterm>
828 </listitem>
829 </varlistentry>
830
831 <varlistentry id="systemd-notify">
832 <term><command>systemd-notify</command></term>
833 <listitem>
834 <para>Is used by daemon scripts to notify the init system of status
835 changes</para>
836 <indexterm zone="ch-system-systemd systemd-notify">
837 <primary sortas="b-systemd-notify">systemd-notify</primary>
838 </indexterm>
839 </listitem>
840 </varlistentry>
841
842 <varlistentry id="systemd-nspawn">
843 <term><command>systemd-nspawn</command></term>
844 <listitem>
845 <para>Is used to run a command, or an entire OS, in a light-weight namespace
846 container</para>
847 <indexterm zone="ch-system-systemd systemd-nspawn">
848 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
849 </indexterm>
850 </listitem>
851 </varlistentry>
852
853 <varlistentry id="systemd-path">
854 <term><command>systemd-path</command></term>
855 <listitem>
856 <para>Is used to query system and user paths</para>
857 <indexterm zone="ch-system-systemd systemd-path">
858 <primary sortas="b-systemd-path">systemd-path</primary>
859 </indexterm>
860 </listitem>
861 </varlistentry>
862
863 <varlistentry id="systemd-repart">
864 <term><command>systemd-repart</command></term>
865 <listitem>
866 <para>Is used to grow and add partitions to a partition table when
867 systemd is used with an OS image (e.g. a container)</para>
868 <indexterm zone="ch-system-systemd systemd-repart">
869 <primary sortas="b-systemd-repart">systemd-repart</primary>
870 </indexterm>
871 </listitem>
872 </varlistentry>
873
874 <varlistentry id="systemd-resolve">
875 <term><command>systemd-resolve</command></term>
876 <listitem>
877 <para>Is used to resolve domain names, IPV4 and IPv6 addresses, DNS
878 resource records, and services</para>
879 <indexterm zone="ch-system-systemd systemd-resolve">
880 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
881 </indexterm>
882 </listitem>
883 </varlistentry>
884
885 <varlistentry id="systemd-run">
886 <term><command>systemd-run</command></term>
887 <listitem>
888 <para>Is used to create and start a transient .service or a .scope
889 unit and run the specified command in it; this is useful for
890 validating systemd units</para>
891 <indexterm zone="ch-system-systemd systemd-run">
892 <primary sortas="b-systemd-run">systemd-run</primary>
893 </indexterm>
894 </listitem>
895 </varlistentry>
896
897 <varlistentry id="systemd-socket-activate">
898 <term><command>systemd-socket-activate</command></term>
899 <listitem>
900 <para>Is used to listen on socket devices and launch a process upon
901 a successful connection to the socket</para>
902 <indexterm zone="ch-system-systemd systemd-socket-activate">
903 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
904 </indexterm>
905 </listitem>
906 </varlistentry>
907
908 <varlistentry id="systemd-sysext">
909 <term><command>systemd-sysext</command></term>
910 <listitem>
911 <para>Activates system extension images</para>
912 <indexterm zone="ch-system-systemd systemd-sysext">
913 <primary sortas="b-systemd-sysext">systemd-sysext</primary>
914 </indexterm>
915 </listitem>
916 </varlistentry>
917
918 <varlistentry id="systemd-tmpfiles">
919 <term><command>systemd-tmpfiles</command></term>
920 <listitem>
921 <para>Creates, deletes, and cleans up volatile and temporary files and
922 directories, based on the configuration file format and location
923 specified in
924 <filename class="directory">tmpfiles.d</filename> directories</para>
925 <indexterm zone="ch-system-systemd systemd-tmpfiles">
926 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
927 </indexterm>
928 </listitem>
929 </varlistentry>
930
931 <varlistentry id="systemd-umount">
932 <term><command>systemd-umount</command></term>
933 <listitem>
934 <para>Unmounts mount points</para>
935 <indexterm zone="ch-system-systemd systemd-umount">
936 <primary sortas="b-systemd-umount">systemd-umount</primary>
937 </indexterm>
938 </listitem>
939 </varlistentry>
940
941 <varlistentry id="systemd-tty-ask-password-agent">
942 <term><command>systemd-tty-ask-password-agent</command></term>
943 <listitem>
944 <para>Is used to list and/or process pending systemd password
945 requests</para>
946 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
947 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
948 </indexterm>
949 </listitem>
950 </varlistentry>
951
952 <varlistentry id="telinit">
953 <term><command>telinit</command></term>
954 <listitem>
955 <para>Tells <command>init</command> which run-level to change
956 to</para>
957 <indexterm zone="ch-system-systemd telinit">
958 <primary sortas="b-telinit">telinit</primary>
959 </indexterm>
960 </listitem>
961 </varlistentry>
962
963 <varlistentry id="timedatectl">
964 <term><command>timedatectl</command></term>
965 <listitem>
966 <para>Is used to query and change the system clock and its settings
967 </para>
968 <indexterm zone="ch-system-systemd timedatectl">
969 <primary sortas="b-timedatectl">timedatectl</primary>
970 </indexterm>
971 </listitem>
972 </varlistentry>
973
974 <varlistentry id="udevadm">
975 <term><command>udevadm</command></term>
976 <listitem>
977 <para>Is a generic udev administration tool which controls the udevd
978 daemon, provides info from the udev hardware database, monitors
979 uevents, waits for uevents to finish, tests udev configuration, and
980 triggers uevents for a given device</para>
981 <indexterm zone="ch-system-systemd udevadm">
982 <primary sortas="b-udevadm">udevadm</primary>
983 </indexterm>
984 </listitem>
985 </varlistentry>
986
987 <varlistentry id="libsystemd">
988 <term><filename class="libraryfile">libsystemd</filename></term>
989 <listitem>
990 <para>Is the main systemd utility library</para>
991 <indexterm zone="ch-system-systemd libsystemd">
992 <primary sortas="c-libsystemd">libsystemd</primary>
993 </indexterm>
994 </listitem>
995 </varlistentry>
996
997 <varlistentry id="libudev">
998 <term><filename class="libraryfile">libudev</filename></term>
999 <listitem>
1000 <para>Is a library to access Udev device information</para>
1001 <indexterm zone="ch-system-systemd libudev">
1002 <primary sortas="c-libudev">libudev</primary>
1003 </indexterm>
1004 </listitem>
1005 </varlistentry>
1006
1007 </variablelist>
1008
1009 </sect2>
1010
1011</sect1>
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