chapter06/systemd.xml

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