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man: document rescue.target and emergency.target in more detail

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Fixes: #2523
This commit is contained in:
Lennart Poettering 2016-02-10 21:29:45 +01:00
parent 926db6521b
commit 6e004630fe
1 changed files with 27 additions and 10 deletions
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37
man/systemd.special.xml
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@ -204,12 +204,22 @@
<varlistentry>
<term><filename>emergency.target</filename></term>
<listitem>
<para>A special target 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.unit=</varname> and has otherwise little
use.
</para>
<para>A special target unit that starts an emergency shell on the main console. This target does not pull in
any serices or mounts. It is the most minimal version of starting the system in order to acquire an
interactive shell; the only processes running are usually just the system manager (PID 1) and the shell
process. This unit is supposed to be used with the kernel command line option
<varname>systemd.unit=</varname>; it is also used when a file system check on a required file system fails,
and boot-up cannot continue. Compare with <filename>rescue.target</filename>, which serves a similar purpose,
but also starts the most basic services and mounts all file systems.</para>
<para>Use the <literal>systemd.unit=emergency.target</literal> kernel command line option to boot into this
mode. A short alias for this kernel command line option is <literal>emergency</literal>, for compatibility
with SysV.</para>
<para>In many ways booting into <filename>emergency.target</filename> is similar to the effect of booting
with <literal>init=/bin/sh</literal> on the kernel command line, except that emergency mode provides you with
the full system and service manager, and allows starting individual units in order to continue the boot
process in steps.</para>
</listitem>
</varlistentry>
<varlistentry>
@ -440,11 +450,18 @@
<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>A special target unit that pulls in the base system (including system mounts) and spawns a rescue
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>
<para><filename>runlevel1.target</filename> is an alias for
this target unit, for compatibility with SysV.</para>
<para><filename>runlevel1.target</filename> is an alias for this target unit, for compatibility with
SysV.</para>
<para>Use the <literal>systemd.unit=rescue.target</literal> kernel command line option to boot into this
mode. A short alias for this kernel command line option is <literal>1</literal>, for compatibility with
SysV.</para>
</listitem>
</varlistentry>
<varlistentry>