"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
+ SPDX-License-Identifier: LGPL-2.1+
+
This file is part of systemd.
Copyright 2010 Lennart Poettering
</refnamediv>
<refsynopsisdiv><para>
- <!-- sort alphabetically, targets first -->
- <filename>basic.target</filename>,
+ <!-- sort alphabetically, targets first --><filename>basic.target</filename>,
<filename>bluetooth.target</filename>,
<filename>cryptsetup-pre.target</filename>,
<filename>cryptsetup.target</filename>,
<filename>poweroff.target</filename>,
<filename>printer.target</filename>,
<filename>reboot.target</filename>,
- <filename>remote-cryptsetup-pre.target</filename>,
<filename>remote-cryptsetup.target</filename>,
<filename>remote-fs-pre.target</filename>,
<filename>remote-fs.target</filename>,
<filename>suspend.target</filename>,
<filename>swap.target</filename>,
<filename>sysinit.target</filename>,
- <filename>syslog.socket</filename>,
<filename>system-update.target</filename>,
<filename>time-sync.target</filename>,
<filename>timers.target</filename>,
<filename>umount.target</filename>,
- <!-- slices -->
- <filename>-.slice</filename>,
+ <!-- slices --><filename>-.slice</filename>,
<filename>system.slice</filename>,
<filename>user.slice</filename>,
<filename>machine.slice</filename>,
- <!-- the rest -->
+ <!-- the rest --><filename>-.mount</filename>,
<filename>dbus.service</filename>,
<filename>dbus.socket</filename>,
<filename>display-manager.service</filename>,
+ <filename>init.scope</filename>,
+ <filename>syslog.socket</filename>,
<filename>system-update-cleanup.service</filename>
</para></refsynopsisdiv>
<title>Special System Units</title>
<variablelist>
+ <varlistentry>
+ <term><filename>-.mount</filename></term>
+ <listitem>
+ <para>The root mount point, i.e. the mount unit for the <filename>/</filename> path. This unit is
+ unconditionally active, during the entire time the system is up, as this mount point is where the basic
+ userspace is running from.</para>
+ </listitem>
+ </varlistentry>
+
<varlistentry>
<term><filename>basic.target</filename></term>
<listitem>
directly.</para>
</listitem>
</varlistentry>
+ <varlistentry>
+ <term><filename>init.scope</filename></term>
+ <listitem>
+ <para>This scope unit is where the system and service manager (PID 1) itself resides. It is active as long as
+ the system is running.</para>
+ </listitem>
+ </varlistentry>
<varlistentry>
<term><filename>initrd-fs.target</filename></term>
<listitem>
it. Note that networking daemons that simply provide
functionality to other hosts generally do not need to pull
this in.</para>
+
+ <para>Note that this unit is only useful during the original system start-up logic. After the system has
+ completed booting up, it will not track the online state of the system anymore. Due to this it cannot be used
+ as a network connection monitor concept, it is purely a one-time system start-up concept.</para>
</listitem>
</varlistentry>
<varlistentry>
this target unit, for compatibility with SysV.</para>
</listitem>
</varlistentry>
- <varlistentry>
- <term><filename>remote-cryptsetup-pre.target</filename></term>
- <listitem>
- <para>This target unit is automatically ordered before all cryptsetup devices
- marked with the <option>_netdev</option>. It can be used to execute additional
- units before such devices are set up.</para>
-
- <para>It is ordered after <filename>network.target</filename> and
- <filename>network-online.target</filename>, and also pulls the latter in as a
- <varname>Wants=</varname> dependency.</para>
- </listitem>
- </varlistentry>
<varlistentry>
<term><filename>remote-cryptsetup.target</filename></term>
<listitem>
shell. Isolate to this target in order to administer the system in single-user mode with all file systems
mounted but with no services running, except for the most basic. Compare with
<filename>emergency.target</filename>, which is much more reduced and does not provide the file systems or
- most basic services.</para>
+ most basic services. Compare with <filename>multi-user.target</filename>, this target could be seen as
+ <filename>single-user.target</filename>.</para>
<para><filename>runlevel1.target</filename> is an alias for this target unit, for compatibility with
SysV.</para>
<term><filename>remote-fs-pre.target</filename></term>
<listitem>
<para>This target unit is automatically ordered before all
- remote mount point units (see above). It can be used to run
- certain units before the remote mounts are established. Note
- that this unit is generally not part of the initial
+ mount point units (see above) and cryptsetup devices
+ marked with the <option>_netdev</option>. It can be used to run
+ certain units before remote encrypted devices and mounts are established.
+ Note that this unit is generally not part of the initial
transaction, unless the unit that wants to be ordered before
all remote mounts pulls it in via a
<varname>Wants=</varname> type dependency. If the unit wants
<refsect1>
<title>Special Slice Units</title>
- <para>There are four <literal>.slice</literal> units which form
- the basis of the hierarchy for assignment of resources for
- services, users, and virtual machines or containers.</para>
+ <para>There are four <literal>.slice</literal> units which form the basis of the hierarchy for assignment of
+ resources for services, users, and virtual machines or containers. See
+ <citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>7</manvolnum></citerefentry> for details about slice
+ units.</para>
<variablelist>
<varlistentry>
<term><filename>-.slice</filename></term>
<listitem>
- <para>The root slice is the root of the hierarchy. It
- usually does not contain units directly, but may be used to
- set defaults for the whole tree.</para>
+ <para>The root slice is the root of the slice hierarchy. It usually does not contain units directly, but may
+ be used to set defaults for the whole tree.</para>
</listitem>
</varlistentry>
<citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.target</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry project='man-pages'><refentrytitle>bootup</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>bootup</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
</para>
</refsect1>
projects / thirdparty / systemd.git / blobdiff