mirror of
https://github.com/morgan9e/systemd
synced 2026-04-14 08:25:20 +09:00
e8d2f6cde0
This introduces remote-fs-setup.target independently of remote-fs-pre.target. The former is only for pulling things in, the latter only for ordering. The new semantics: remote-fs-setup.target: is pulled in automatically by all remote mounts. Shall be used to pull in other units that want to run when at least one remote mount is set up. Is not ordered against the actual mount units, in order to allow activation of its dependencies even 'a posteriori', i.e. when a mount is established outside of systemd and is only picked up by it. remote-fs-pre.target: needs to be pulled in automatically by the implementing service, is otherwise not part of the initial transaction. This is ordered before all remote mount units. A service that wants to be pulled in and run before all remote mounts should hence have: a) WantedBy=remote-fs-setup.target -- so that it is pulled in b) Wants=remote-fs-pre.target + Before=remote-fs-pre.target -- so that it is ordered before the mount point, normally.
941 lines
53 KiB
XML
941 lines
53 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="systemd.special">
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<refentryinfo>
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<title>systemd.special</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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|
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<refmeta>
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<refentrytitle>systemd.special</refentrytitle>
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<manvolnum>7</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd.special</refname>
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<refpurpose>Special systemd units</refpurpose>
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</refnamediv>
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|
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<refsynopsisdiv>
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<para><filename>basic.target</filename>,
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<filename>bluetooth.target</filename>,
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<filename>ctrl-alt-del.target</filename>,
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<filename>cryptsetup.target</filename>,
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<filename>dbus.service</filename>,
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<filename>dbus.socket</filename>,
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<filename>default.target</filename>,
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<filename>display-manager.service</filename>,
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<filename>emergency.target</filename>,
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<filename>exit.target</filename>,
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<filename>final.target</filename>,
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<filename>getty.target</filename>,
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<filename>graphical.target</filename>,
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<filename>halt.target</filename>,
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<filename>hibernate.target</filename>,
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<filename>hybrid-sleep.target</filename>,
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<filename>initrd-fs.target</filename>,
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<filename>kbrequest.target</filename>,
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<filename>kexec.target</filename>,
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<filename>local-fs.target</filename>,
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<filename>local-fs-pre.target</filename>,
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<filename>multi-user.target</filename>,
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<filename>network.target</filename>,
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<filename>nss-lookup.target</filename>,
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<filename>nss-user-lookup.target</filename>,
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<filename>paths.target</filename>,
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<filename>poweroff.target</filename>,
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<filename>printer.target</filename>,
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<filename>reboot.target</filename>,
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<filename>remote-fs.target</filename>,
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<filename>remote-fs-pre.target</filename>,
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<filename>remote-fs-setup.target</filename>,
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<filename>rescue.target</filename>,
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<filename>initrd-root-fs.target</filename>,
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<filename>rpcbind.target</filename>,
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<filename>runlevel2.target</filename>,
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<filename>runlevel3.target</filename>,
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<filename>runlevel4.target</filename>,
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<filename>runlevel5.target</filename>,
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<filename>shutdown.target</filename>,
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<filename>sigpwr.target</filename>,
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<filename>sleep.target</filename>,
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<filename>smartcard.target</filename>,
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<filename>sockets.target</filename>,
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<filename>sound.target</filename>,
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<filename>suspend.target</filename>,
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<filename>swap.target</filename>,
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<filename>sysinit.target</filename>,
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<filename>syslog.socket</filename>,
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<filename>system-update.target</filename>,
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<filename>time-sync.target</filename>,
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<filename>timers.target</filename>,
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<filename>umount.target</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>A few units are treated specially by
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systemd. They have special internal semantics and
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cannot be renamed.</para>
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</refsect1>
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<refsect1>
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<title>Special System Units</title>
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<variablelist>
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<varlistentry>
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<term><filename>basic.target</filename></term>
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<listitem>
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<para>A special target unit
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covering basic boot-up.</para>
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<para>systemd automatically
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adds dependencies of the types
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<varname>Requires=</varname>
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and <varname>After=</varname>
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for this target unit to all
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services (except for those
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with
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<varname>DefaultDependencies=no</varname>).</para>
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<para>Usually this should
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pull-in all mount points, swap
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devices, sockets, timers, and
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path units and other basic
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initialization necessary for
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general purpose
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daemons.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>bluetooth.target</filename></term>
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<listitem>
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<para>This target is started
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automatically as soon as a
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Bluetooth controller is
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plugged in or becomes
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available at boot.</para>
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<para>This may be used to pull
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in Bluetooth management
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daemons dynamically when
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Bluetooth hardware is
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found.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>ctrl-alt-del.target</filename></term>
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<listitem>
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<para>systemd starts this
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target whenever
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Control+Alt+Del is pressed on
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the console. Usually this
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should be aliased (symlinked)
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to
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<filename>reboot.target</filename>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>cryptsetup.target</filename></term>
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<listitem>
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<para>A target that pulls in
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setup services for all
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encrypted block
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devices.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>dbus.service</filename></term>
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<listitem>
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<para>A special unit for the
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D-Bus bus daemon. As soon as
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this service is fully started
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up systemd will connect to it
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and register its
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service.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>dbus.socket</filename></term>
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<listitem>
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<para>A special unit for the
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D-Bus system bus socket. All
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units with
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<varname>Type=dbus</varname>
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automatically gain a
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dependency on this
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unit.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>default.target</filename></term>
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<listitem>
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<para>The default unit systemd
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starts at bootup. Usually this
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should be aliased (symlinked)
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to
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<filename>multi-user.target</filename>
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or
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<filename>graphical.target</filename>.</para>
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<para>The default unit systemd
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starts at bootup can be
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overridden with the
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<varname>systemd.unit=</varname>
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kernel command line option.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>display-manager.service</filename></term>
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<listitem>
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<para>The display manager
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service. Usually this should
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be aliased (symlinked) to
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<filename>gdm.service</filename>
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or a similar display manager
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service.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>emergency.target</filename></term>
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<listitem>
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<para>A special target unit
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that starts an emergency
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shell on the main
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console. This unit is supposed
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to be used with the kernel
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command line option
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<varname>systemd.unit=</varname>
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and has otherwise little use.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>final.target</filename></term>
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<listitem>
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<para>A special target unit
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that is used during the
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shutdown logic and may be used
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to pull in late services after
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all normal services are
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already terminated and all
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mounts unmounted.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>getty.target</filename></term>
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<listitem>
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<para>A special target unit
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that pulls in statically
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configured local TTY
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<filename>getty</filename>
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instances.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>graphical.target</filename></term>
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<listitem>
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<para>A special target unit
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for setting up a graphical
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login screen. This pulls in
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<filename>multi-user.target</filename>.</para>
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<para>Units that are needed
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for graphical logins shall add
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<varname>Wants=</varname>
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dependencies for their unit to
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this unit (or
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<filename>multi-user.target</filename>)
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during installation. This is
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best configured via
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<varname>WantedBy=graphical.target</varname>
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in the unit's
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<literal>[Install]</literal>
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section.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
|
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<term><filename>hibernate.target</filename></term>
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<listitem>
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<para>A special target unit
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for hibernating the
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system. This pulls in
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<filename>sleep.target</filename>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>hybrid-sleep.target</filename></term>
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<listitem>
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<para>A special target unit
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for hibernating and suspending the
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system at the same time. This pulls in
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<filename>sleep.target</filename>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
|
|
<term><filename>halt.target</filename></term>
|
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<listitem>
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<para>A special target unit
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for shutting down and halting
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the system. Note that this
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target is distinct from
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<filename>poweroff.target</filename>
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in that it generally really
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just halts the system rather
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than powering it down.</para>
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<para>Applications wanting to
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halt the system should start
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this unit.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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|
<term><filename>initrd-fs.target</filename></term>
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<listitem>
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<para><citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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automatically adds
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dependencies of type
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<varname>Before=</varname> to
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<filename>sysroot-usr.mount</filename>
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and all mount points fround in
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<filename>/etc/fstab</filename>
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that have the
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<option>auto</option> and
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<option>x-initrd.mount</option>
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mount options set.
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</para>
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</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>kbrequest.target</filename></term>
|
|
<listitem>
|
|
<para>systemd starts this
|
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target whenever Alt+ArrowUp is
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pressed on the console. This
|
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is a good candidate to be
|
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aliased (symlinked) to
|
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<filename>rescue.target</filename>.</para>
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</listitem>
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</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>kexec.target</filename></term>
|
|
<listitem>
|
|
<para>A special target unit
|
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for shutting down and rebooting the system via kexec.</para>
|
|
|
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<para>Applications wanting to
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reboot the system with kexec should start
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this unit.</para>
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</listitem>
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|
</varlistentry>
|
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<varlistentry>
|
|
<term><filename>local-fs.target</filename></term>
|
|
<listitem>
|
|
<para><citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
|
automatically adds
|
|
dependencies of type
|
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<varname>Before=</varname> to
|
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all mount units that refer to
|
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local mount points for this
|
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target unit. In addition, it
|
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adds dependencies of type
|
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<varname>Wants=</varname> to
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this target unit for those
|
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mounts listed in
|
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<filename>/etc/fstab</filename>
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that have the
|
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<option>auto</option> mount
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option set.</para>
|
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</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>local-fs-pre.target</filename></term>
|
|
<listitem>
|
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<para>This target unit is
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automatically ordered before
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all local mount points marked
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with <option>auto</option>
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(see above). It can be used to
|
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execute certain units before
|
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all local mounts.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>multi-user.target</filename></term>
|
|
<listitem>
|
|
<para>A special target unit
|
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for setting up a multi-user
|
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system (non-graphical). This
|
|
is pulled in by
|
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<filename>graphical.target</filename>.</para>
|
|
|
|
<para>Units that are needed
|
|
for a multi-user system shall
|
|
add <varname>Wants=</varname>
|
|
dependencies for their unit to
|
|
this unit during
|
|
installation. This is best
|
|
configured via
|
|
<varname>WantedBy=multi-uer.target</varname>
|
|
in the unit's
|
|
<literal>[Install]</literal>
|
|
section.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>network.target</filename></term>
|
|
<listitem>
|
|
<para>systemd automatically
|
|
adds dependencies of type
|
|
<varname>After=</varname> for
|
|
this target unit to all SysV
|
|
init script service units with
|
|
an LSB header referring to the
|
|
<literal>$network</literal>
|
|
facility.</para>
|
|
|
|
<para>This unit is supposed to
|
|
indicate when the network is
|
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"up", but it is only very
|
|
loosely defined what that is
|
|
supposed to mean. Also see <ulink
|
|
url="http://www.freedesktop.org/wiki/Software/systemd/NetworkTarget">Running
|
|
Services After the Network is
|
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up</ulink> for more
|
|
information.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>nss-lookup.target</filename></term>
|
|
<listitem>
|
|
<para>A target that should be
|
|
used as synchronization point
|
|
for all host/network name
|
|
service lookups. Note that
|
|
this is independent of
|
|
user/group name lookups for
|
|
which
|
|
<filename>nss-user-lookup.target</filename>
|
|
should be used. systemd
|
|
automatically adds
|
|
dependencies of type
|
|
<varname>After=</varname> for
|
|
this target unit to all SysV
|
|
init script service units with
|
|
an LSB header referring to the
|
|
<literal>$named</literal>
|
|
facility.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>nss-user-lookup.target</filename></term>
|
|
<listitem>
|
|
<para>A target that should be
|
|
used as synchronization point
|
|
for all user/group name
|
|
service lookups. Note that
|
|
this is independent of
|
|
host/network name lookups for
|
|
which
|
|
<filename>nss-lookup.target</filename>
|
|
should be used. </para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>paths.target</filename></term>
|
|
<listitem>
|
|
<para>A special target unit
|
|
that sets up all path units
|
|
(see
|
|
<citerefentry><refentrytitle>systemd.path</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
|
for details) that shall be
|
|
active after boot.</para>
|
|
|
|
<para>It is recommended that
|
|
path units installed by
|
|
applications get pulled in via
|
|
<varname>Wants=</varname>
|
|
dependencies from this
|
|
unit. This is best configured
|
|
via a
|
|
<varname>WantedBy=paths.target</varname>
|
|
in the path unit's
|
|
<literal>[Install]</literal>
|
|
section.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>poweroff.target</filename></term>
|
|
<listitem>
|
|
<para>A special target unit
|
|
for shutting down and powering off the system.</para>
|
|
|
|
<para>Applications wanting to
|
|
power off the system should start
|
|
this unit.</para>
|
|
|
|
<para><filename>runlevel0.target</filename>
|
|
is an alias for this target
|
|
unit, for compatibility with SysV.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>printer.target</filename></term>
|
|
<listitem>
|
|
<para>This target is started
|
|
automatically as soon as a
|
|
printer is plugged in or
|
|
becomes available at
|
|
boot.</para>
|
|
|
|
<para>This may be used to pull
|
|
in printer management
|
|
daemons dynamically when
|
|
printer hardware is
|
|
found.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>reboot.target</filename></term>
|
|
<listitem>
|
|
<para>A special target unit
|
|
for shutting down and rebooting the system.</para>
|
|
|
|
<para>Applications wanting to
|
|
reboot the system should start
|
|
this unit.</para>
|
|
|
|
<para><filename>runlevel6.target</filename>
|
|
is an alias for this target
|
|
unit, for compatibility with SysV.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>remote-fs.target</filename></term>
|
|
<listitem>
|
|
<para>Similar to
|
|
<filename>local-fs.target</filename>,
|
|
but for remote mount
|
|
points.</para>
|
|
|
|
<para>systemd automatically
|
|
adds dependencies of type
|
|
<varname>After=</varname> for
|
|
this target unit to all SysV
|
|
init script service units with
|
|
an LSB header referring to the
|
|
<literal>$remote_fs</literal>
|
|
facility.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<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 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
|
|
to be pulled in by the first
|
|
remote mount showing up it
|
|
should use
|
|
<filename>remote-fs-setup.target</filename>
|
|
(see below).</para>
|
|
|
|
<para>Again, this target unit
|
|
is <emphasis>not</emphasis>
|
|
suitable for pulling in other
|
|
units, it is only useful for
|
|
ordering.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>remote-fs-setup.target</filename></term>
|
|
<listitem>
|
|
<para>This target unit is
|
|
automatically pulled in (by a
|
|
<varname>Wants=</varname> type
|
|
dependency) by all remote
|
|
mount points. It can be used
|
|
to run certain units when at
|
|
least one remote file system
|
|
is to be mounted. Note that
|
|
this target is not ordered
|
|
against the remote mounts, use
|
|
<filename>remote-fs-pre.target</filename>
|
|
for that.</para>
|
|
|
|
<para>Again, this target unit
|
|
is <emphasis>not</emphasis>
|
|
suitable for ordering, it is
|
|
only useful for pulling in
|
|
other units.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>rescue.target</filename></term>
|
|
<listitem>
|
|
<para>A special target unit
|
|
for setting up the base system
|
|
and a rescue shell.</para>
|
|
|
|
<para><filename>runlevel1.target</filename>
|
|
is an alias for this target
|
|
unit, for compatibility with SysV.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>initrd-root-fs.target</filename></term>
|
|
<listitem>
|
|
<para><citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
|
automatically adds
|
|
dependencies of type
|
|
<varname>Before=</varname> to
|
|
the
|
|
<filename>sysroot.mount</filename>
|
|
unit, which is generated from
|
|
the kernel command line.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>rpcbind.target</filename></term>
|
|
<listitem>
|
|
<para>systemd automatically
|
|
adds dependencies of type
|
|
<varname>After=</varname> for
|
|
this target unit to all SysV
|
|
init script service units with
|
|
an LSB header referring to the
|
|
<literal>$portmap</literal>
|
|
facility.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>runlevel2.target</filename></term>
|
|
<term><filename>runlevel3.target</filename></term>
|
|
<term><filename>runlevel4.target</filename></term>
|
|
<term><filename>runlevel5.target</filename></term>
|
|
<listitem>
|
|
<para>These are targets that
|
|
are called whenever the SysV
|
|
compatibility code asks for
|
|
runlevel 2, 3, 4, 5,
|
|
respectively. It is a good
|
|
idea to make this an alias for
|
|
(i.e. symlink to)
|
|
<filename>multi-user.target</filename>
|
|
(for runlevel 2) or
|
|
<filename>graphical.target</filename>
|
|
(the others).</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>shutdown.target</filename></term>
|
|
<listitem>
|
|
<para>A special target unit
|
|
that terminates the services
|
|
on system shutdown.</para>
|
|
|
|
<para>Services that shall be
|
|
terminated on system shutdown
|
|
shall add <varname>Conflicts=</varname>
|
|
dependencies to this unit for
|
|
their service unit, which is
|
|
implicitly done when
|
|
<varname>DefaultDependencies=yes</varname>
|
|
is set (the default).</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>sigpwr.target</filename></term>
|
|
<listitem>
|
|
<para>A special target that is
|
|
started when systemd receives
|
|
the SIGPWR process signal,
|
|
which is normally sent by the
|
|
kernel or UPS daemons when
|
|
power fails.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>sleep.target</filename></term>
|
|
<listitem>
|
|
<para>A special target unit
|
|
that is pulled in by
|
|
<filename>suspend.target</filename>,
|
|
<filename>hibernate.target</filename>
|
|
and
|
|
<filename>hybrid-sleep.target</filename>
|
|
and may be used to hook units
|
|
into the sleep state
|
|
logic.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>smartcard.target</filename></term>
|
|
<listitem>
|
|
<para>This target is started
|
|
automatically as soon as a
|
|
smartcard controller is
|
|
plugged in or becomes
|
|
available at boot.</para>
|
|
|
|
<para>This may be used to pull
|
|
in printer management
|
|
daemons dynamically when
|
|
smartcard hardware is
|
|
found.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>sockets.target</filename></term>
|
|
<listitem>
|
|
<para>A special target unit
|
|
that sets up all socket
|
|
units.(see
|
|
<citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
|
for details) that shall be
|
|
active after boot.</para>
|
|
|
|
<para>Services that can be
|
|
socket-activated shall add
|
|
<varname>Wants=</varname>
|
|
dependencies to this unit for
|
|
their socket unit during
|
|
installation. This is best
|
|
configured via a
|
|
<varname>WantedBy=sockets.target</varname>
|
|
in the socket unit's
|
|
<literal>[Install]</literal>
|
|
section.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>sound.target</filename></term>
|
|
<listitem>
|
|
<para>This target is started
|
|
automatically as soon as a
|
|
sound card is plugged in or
|
|
becomes available at
|
|
boot.</para>
|
|
|
|
<para>This may be used to pull
|
|
in audio management daemons
|
|
dynamically when printer
|
|
hardware is found.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>suspend.target</filename></term>
|
|
<listitem>
|
|
<para>A special target unit
|
|
for suspending the
|
|
system. This pulls in
|
|
<filename>sleep.target</filename>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>swap.target</filename></term>
|
|
<listitem>
|
|
<para>Similar to
|
|
<filename>local-fs.target</filename>, but for swap
|
|
partitions and swap
|
|
files.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>sysinit.target</filename></term>
|
|
<listitem>
|
|
<para>A special target unit
|
|
covering early boot-up scripts.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>syslog.socket</filename></term>
|
|
<listitem>
|
|
<para>The socket unit
|
|
syslog implementations should
|
|
listen on. All userspace log
|
|
messages will be made
|
|
available on this socket. For
|
|
more information about syslog
|
|
integration, please consult
|
|
the <ulink
|
|
url="http://www.freedesktop.org/wiki/Software/systemd/syslog">Syslog
|
|
Interface</ulink>
|
|
document.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>system-update.target</filename></term>
|
|
<listitem>
|
|
<para>A special target unit
|
|
that is used for off-line
|
|
system updates.
|
|
<citerefentry><refentrytitle>systemd-system-update-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
|
|
will redirect the boot process
|
|
to this target if
|
|
<filename>/system-update</filename>
|
|
exists. For more information
|
|
see the <ulink
|
|
url="http://freedesktop.org/wiki/Software/systemd/SystemUpdates">System
|
|
Updates
|
|
Specification</ulink>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>time-sync.target</filename></term>
|
|
<listitem>
|
|
<para>systemd automatically
|
|
adds dependencies of type
|
|
<varname>After=</varname> for
|
|
this target unit to all SysV
|
|
init script service units with
|
|
an LSB header referring to the
|
|
<literal>$time</literal>
|
|
facility.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>timers.target</filename></term>
|
|
<listitem>
|
|
<para>A special target unit
|
|
that sets up all timer
|
|
units (see
|
|
<citerefentry><refentrytitle>systemd.timer</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
|
for details) that shall be
|
|
active after boot.</para>
|
|
|
|
<para>It is recommended that
|
|
timer units installed by
|
|
applications get pulled in via
|
|
<varname>Wants=</varname>
|
|
dependencies from this
|
|
unit. This is best configured
|
|
via
|
|
<varname>WantedBy=timers.target</varname>
|
|
in the timer unit's
|
|
<literal>[Install]</literal>
|
|
section.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>umount.target</filename></term>
|
|
<listitem>
|
|
<para>A special target unit
|
|
that umounts all mount and
|
|
automount points on system
|
|
shutdown.</para>
|
|
|
|
<para>Mounts that shall be
|
|
unmounted on system shutdown
|
|
shall add Conflicts
|
|
dependencies to this unit for
|
|
their mount unit, which is
|
|
implicitly done when
|
|
<varname>DefaultDependencies=yes</varname>
|
|
is set (the default).</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Special User Units</title>
|
|
|
|
<para>When systemd runs as a user instance, the
|
|
following special units are available, which have
|
|
similar definitions as their system counterparts:
|
|
<filename>default.target</filename>,
|
|
<filename>shutdown.target</filename>,
|
|
<filename>sockets.target</filename></para>
|
|
|
|
<para>In addition the following special unit is
|
|
understood only when systemd runs as service instance:</para>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><filename>exit.target</filename></term>
|
|
<listitem>
|
|
<para>A special service unit
|
|
for shutting down the
|
|
user service manager.</para>
|
|
|
|
<para>Applications wanting to
|
|
terminate the user service
|
|
manager should start this
|
|
unit. If systemd receives
|
|
SIGTERM or SIGINT when running
|
|
as user service daemon it will
|
|
start this unit.</para>
|
|
|
|
<para>Normally, this pulls in
|
|
<filename>shutdown.target</filename>
|
|
which in turn should be
|
|
conflicted by all units that
|
|
want to be shut down on
|
|
user service manager exit.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.target</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>bootup</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|