mirror of
https://github.com/AuxXxilium/eudev.git
synced 2024-12-16 03:27:49 +07:00
606 lines
33 KiB
XML
606 lines
33 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
|
|
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
|
|
|
|
<!--
|
|
This file is part of systemd.
|
|
|
|
Copyright 2010 Lennart Poettering
|
|
|
|
systemd is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
systemd is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
|
-->
|
|
|
|
<refentry id="systemd.special">
|
|
|
|
<refentryinfo>
|
|
<title>systemd.special</title>
|
|
<productname>systemd</productname>
|
|
|
|
<authorgroup>
|
|
<author>
|
|
<contrib>Developer</contrib>
|
|
<firstname>Lennart</firstname>
|
|
<surname>Poettering</surname>
|
|
<email>lennart@poettering.net</email>
|
|
</author>
|
|
</authorgroup>
|
|
</refentryinfo>
|
|
|
|
<refmeta>
|
|
<refentrytitle>systemd.special</refentrytitle>
|
|
<manvolnum>7</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>systemd.special</refname>
|
|
<refpurpose>special systemd units</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<para><filename>basic.target</filename>,
|
|
<filename>ctrl-alt-del.target</filename>,
|
|
<filename>default.target</filename>,
|
|
<filename>emergency.service</filename>,
|
|
<filename>graphical.target</filename>,
|
|
<filename>halt.target</filename>,
|
|
<filename>kbrequest.target</filename>,
|
|
<filename>local-fs.target</filename>,
|
|
<filename>multi-user.target</filename>,
|
|
<filename>network.target</filename>,
|
|
<filename>nss-lookup.target</filename>,
|
|
<filename>poweroff.target</filename>,
|
|
<filename>reboot.target</filename>,
|
|
<filename>remote-fs.target</filename>,
|
|
<filename>rescue.target</filename>,
|
|
<filename>rpcbind.target</filename>,
|
|
<filename>rtc-set.target</filename>,
|
|
<filename>runlevel0.target</filename>,
|
|
<filename>runlevel1.target</filename>,
|
|
<filename>runlevel2.target</filename>,
|
|
<filename>runlevel3.target</filename>,
|
|
<filename>runlevel4.target</filename>,
|
|
<filename>runlevel5.target</filename>,
|
|
<filename>runlevel6.target</filename>
|
|
<filename>shutdown.target</filename>,
|
|
<filename>sigpwr.target</filename>,
|
|
<filename>sockets.target</filename>,
|
|
<filename>swap.target</filename>,
|
|
<filename>syslog.target</filename>,
|
|
<filename>systemd-initctl.service</filename>,
|
|
<filename>systemd-initctl.socket</filename>,
|
|
<filename>systemd-logger.service</filename>,
|
|
<filename>systemd-logger.socket</filename></para>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para>A few units are treated specially by
|
|
systemd. They have special internal semantics and
|
|
cannot be renamed.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Special System Units</title>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><filename>basic.target</filename></term>
|
|
<listitem>
|
|
<para>A special target unit
|
|
covering early boot-up.</para>
|
|
<para>systemd automatically
|
|
adds dependencies of the types
|
|
Requires and After for this
|
|
target unit to all SysV
|
|
service units configured for
|
|
runlevel 1 to 5.</para>
|
|
<para>systemd automatically
|
|
adds dependencies of the types
|
|
Wants and After for all
|
|
SysV service units configured
|
|
for runlevels that are not 0
|
|
to 6 to this target unit.
|
|
This covers the special
|
|
boot-up runlevels some
|
|
distributions have, such as S
|
|
or b.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>ctrl-alt-del.target</filename></term>
|
|
<listitem>
|
|
<para>systemd starts this
|
|
target whenever
|
|
Control+Alt+Del is pressed on
|
|
the console. Usually this
|
|
should be aliased (symlinked)
|
|
to
|
|
<filename>reboot.target</filename>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>default.target</filename></term>
|
|
<listitem>
|
|
<para>The default unit systemd
|
|
starts at bootup. Usually this
|
|
should be aliased (symlinked)
|
|
to
|
|
<filename>multi-user.target</filename>
|
|
or
|
|
<filename>graphical.target</filename>.</para>
|
|
<para>The default unit systemd
|
|
starts at bootup can be
|
|
overriden with the
|
|
<varname>systemd.default=</varname>
|
|
kernel command line option.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>emergency.service</filename></term>
|
|
<listitem>
|
|
<para>A special service unit
|
|
that starts an emergency
|
|
shell on the main
|
|
console. This unit is supposed
|
|
to be used with the kernel
|
|
command line option
|
|
<varname>systemd.default=</varname>
|
|
and has otherwise little use.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>graphical.target</filename></term>
|
|
<listitem>
|
|
<para>A special target unit
|
|
for setting up a graphical
|
|
login screen. This pulls in
|
|
<filename>multi-user.target</filename>.</para>
|
|
|
|
<para>Units that are needed
|
|
for graphical login shall add
|
|
Wants dependencies for their
|
|
unit to this unit (or
|
|
<filename>multi-user.target</filename>)
|
|
during installation.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>halt.target</filename></term>
|
|
<listitem>
|
|
<para>A special target unit
|
|
for shutting down and halting the system.</para>
|
|
|
|
<para>Applications wanting to
|
|
halt the system should start
|
|
this unit.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>kbrequest.target</filename></term>
|
|
<listitem>
|
|
<para>systemd starts this
|
|
target whenever Alt+ArrowUp is
|
|
pressed on the console. This
|
|
is a good candidate to be
|
|
aliased (symlinked) to
|
|
<filename>rescue.target</filename>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>local-fs.target</filename></term>
|
|
<listitem>
|
|
<para>systemd automatically
|
|
adds dependencies of type
|
|
After to all mount units that
|
|
refer to local mount points
|
|
for this target unit. In
|
|
addition, systemd adds
|
|
dependencies of type Wants to
|
|
this target unit for those
|
|
mounts listed in
|
|
<filename>/etc/fstab</filename>
|
|
that have the
|
|
<literal>auto</literal> and
|
|
<literal>comment=systemd.mount</literal>
|
|
mount options set.</para>
|
|
|
|
<para>systemd automatically
|
|
adds dependencies of type
|
|
After for this target unit to
|
|
all SysV init script service
|
|
units with an LSB header
|
|
referring to the
|
|
<literal>$local_fs</literal>
|
|
facility.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>multi-user.target</filename></term>
|
|
<listitem>
|
|
<para>A special target unit
|
|
for setting up a multi-user
|
|
system (non-graphical). This
|
|
is pulled in by
|
|
<filename>graphical.target</filename>.</para>
|
|
|
|
<para>Units that are needed
|
|
for a multi-user system shall
|
|
add Wants dependencies to
|
|
this unit for their unit during
|
|
installation.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>network.target</filename></term>
|
|
<listitem>
|
|
<para>systemd automatically
|
|
adds dependencies of type
|
|
After for this target unit to
|
|
all SysV init script service
|
|
units with an LSB header
|
|
referring to the
|
|
<literal>$network</literal>
|
|
facility.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>nss-lookup.target</filename></term>
|
|
<listitem>
|
|
<para>systemd automatically
|
|
adds dependencies of type
|
|
After for this target unit to
|
|
all SysV init script service
|
|
units with an LSB header
|
|
referring to the
|
|
<literal>$named</literal>
|
|
facility.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>poweroff.target</filename></term>
|
|
<listitem>
|
|
<para>A special target unit
|
|
for shutting down and powering off the system.</para>
|
|
|
|
<para>Applications wanting to
|
|
power off the system should start
|
|
this unit.</para>
|
|
|
|
<para><filename>runlevel0.target</filename>
|
|
is an alias for this target
|
|
unit, for compatibility with SysV.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>reboot.target</filename></term>
|
|
<listitem>
|
|
<para>A special target unit
|
|
for shutting down and rebooting the system.</para>
|
|
|
|
<para>Applications wanting to
|
|
reboot the system should start
|
|
this unit.</para>
|
|
|
|
<para><filename>runlevel6.target</filename>
|
|
is an alias for this target
|
|
unit, for compatibility with SysV.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>remote-fs.target</filename></term>
|
|
<listitem>
|
|
<para>Similar to
|
|
<filename>local-fs.target</filename>,
|
|
but for remote mount
|
|
points.</para>
|
|
|
|
<para>systemd automatically
|
|
adds dependencies of type
|
|
After for this target unit to
|
|
all SysV init script service
|
|
units with an LSB header
|
|
referring to the
|
|
<literal>$remote-fs</literal>
|
|
facility.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>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>rpcbind.target</filename></term>
|
|
<listitem>
|
|
<para>systemd automatically
|
|
adds dependencies of type
|
|
After for this target unit to
|
|
all SysV init script service
|
|
units with an LSB header
|
|
referring to the
|
|
<literal>$rpcbind</literal>
|
|
facility.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>rtc-set.target</filename></term>
|
|
<listitem>
|
|
<para>systemd automatically
|
|
adds dependencies of type
|
|
After for this target unit to
|
|
all SysV init script service
|
|
units with an LSB header
|
|
referring to the
|
|
<literal>$time</literal>
|
|
facility.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>runlevel0.target</filename></term>
|
|
<listitem>
|
|
<para>This is a target that is
|
|
called whever the SysV
|
|
compatibility code asks for
|
|
runlevel 0. This is an alias
|
|
for
|
|
<filename>poweroff.target</filename>,
|
|
for compatibility with
|
|
SysV.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>runlevel1.target</filename></term>
|
|
<listitem>
|
|
<para>This is a target that is
|
|
called whever the SysV
|
|
compatibility code asks for
|
|
runlevel 1. This is an alias
|
|
for
|
|
<filename>rescue.target</filename>,
|
|
for compatibility with
|
|
SysV.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>runlevel2.target</filename></term>
|
|
<listitem>
|
|
<para>This is a target that is
|
|
called whever the SysV
|
|
compatibility code asks for
|
|
runlevel 2. It is a good idea
|
|
to make this an alias for
|
|
(i.e. symlink to)
|
|
<filename>multi-user.target</filename>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>runlevel3.target</filename></term>
|
|
<listitem>
|
|
<para>This is a target that is
|
|
called whever the SysV
|
|
compatibility code asks for
|
|
runlevel 3. It is a good idea
|
|
to make this an alias for
|
|
(i.e. symlink to)
|
|
<filename>multi-user.target</filename>
|
|
or
|
|
<filename>graphical.target</filename>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>runlevel4.target</filename></term>
|
|
<listitem>
|
|
<para>This is a target that is
|
|
called whever the SysV
|
|
compatibility code asks for
|
|
runlevel 4. It is a good idea
|
|
to make this an alias for
|
|
(i.e. symlink to)
|
|
<filename>multi-user.target</filename>
|
|
or
|
|
<filename>graphical.target</filename>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>runlevel5.target</filename></term>
|
|
<listitem>
|
|
<para>This is a target that is
|
|
called whever the SysV
|
|
compatibility code asks for
|
|
runlevel 5. It is a good idea
|
|
to make this an alias for
|
|
(i.e. symlink to)
|
|
<filename>multi-user.target</filename>
|
|
or
|
|
<filename>graphical.target</filename>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>runlevel6.target</filename></term>
|
|
<listitem>
|
|
<para>This is a target that is
|
|
called whever the SysV
|
|
compatibility code asks for
|
|
runlevel 6. This is an alias
|
|
for
|
|
<filename>reboot.target</filename>,
|
|
for compatibility with
|
|
SysV.</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 Conflicts
|
|
dependencies to this unit for
|
|
their service unit during
|
|
installation.</para>
|
|
|
|
<para>systemd automatically
|
|
adds dependencies of type
|
|
Conflicts to this target unit
|
|
for all SysV init script
|
|
service units that shall be
|
|
terminated in SysV runlevels 0
|
|
or 6.</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>sockets.target</filename></term>
|
|
<listitem>
|
|
<para>A special target unit
|
|
that sets up all service
|
|
sockets.</para>
|
|
|
|
<para>Services that can be
|
|
socket-activated shall add
|
|
Wants dependencies to this
|
|
unit for their socket unit
|
|
during installation.</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>syslog.target</filename></term>
|
|
<listitem>
|
|
<para>systemd automatically
|
|
adds dependencies of type
|
|
After for this target unit to
|
|
all SysV init script service
|
|
units with an LSB header
|
|
referring to the
|
|
<literal>$syslog</literal>
|
|
facility.</para>
|
|
|
|
<para>Administrators should
|
|
ensure that this target pulls
|
|
in a service unit with the
|
|
name or alias of
|
|
<filename>@SPECIAL_SYSLOG_SERVICE@</filename>
|
|
(or a socket unit that
|
|
activates this
|
|
service).</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>systemd-initctl.service</filename></term>
|
|
<listitem>
|
|
<para>This provides
|
|
compatibility with the SysV
|
|
/dev/initctl file system FIFO
|
|
for communication with the
|
|
init system.</para>
|
|
<para>This is a
|
|
socket-activated service, see
|
|
<filename>system-initctl.socket</filename>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>systemd-initctl.socket</filename></term>
|
|
<listitem>
|
|
<para>Socket activation unit
|
|
for
|
|
<filename>system-initctl.service</filename>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>systemd-logger.service</filename></term>
|
|
<listitem>
|
|
<para>This is internally used
|
|
by systemd to provide syslog
|
|
logging to the processes it
|
|
maintains.</para>
|
|
<para>This is a
|
|
socket-activated service, see
|
|
<filename>system-logger.socket</filename>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><filename>systemd-logger.socket</filename></term>
|
|
<listitem>
|
|
<para>Socket activation unit
|
|
for
|
|
<filename>system-logger.service</filename>. systemd
|
|
will automatically add
|
|
dependencies of types Requires
|
|
and After to all units that
|
|
have been configured for
|
|
stdout or stderr to be
|
|
connected to syslog or the
|
|
kernel log buffer.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Special Session Units</title>
|
|
|
|
<para>When systemd runs as a service instance, the
|
|
following special units are available, which have
|
|
similar definitions as their system counterparts:
|
|
<filename>default.target</filename>,
|
|
<filename>local-fs.target</filename>,
|
|
<filename>remote-fs.target</filename>,
|
|
<filename>shutdown.target</filename>,
|
|
<filename>sockets.target</filename>,
|
|
<filename>swap.target</filename>.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para>
|
|
<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>
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|