99 lines
3.7 KiB
HTML
99 lines
3.7 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
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<html>
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<head>
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<title>runit - runlevels</title>
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</head>
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<body>
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<a href="http://smarden.org/pape/">G. Pape</a><br>
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<a href="index.html">runit</a><br>
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<hr>
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<h1>runit - runlevels</h1>
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<hr>
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<a href="#prepare">Prepare runit for using runlevels</a><br>
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<a href="#switch">Switching runlevels</a><br>
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<a href="#create">Creating runlevels</a>
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<hr>
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<a name="prepare"><h3>Prepare runit</h3></a>
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If not yet done, configure your system to use
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<a href="runit.8.html">runit</a> as process no 1 by following the
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<a href="replaceinit.html">instructions</a>.
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<p>
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Create the following directories and symbolic links:
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<pre>
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# mkdir -p /etc/runit/runsvdir/default
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# mkdir -p /etc/runit/runsvdir/single
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# ln -s /etc/sv/getty-5 /etc/runit/runsvdir/single/
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# ln -s default /etc/runit/runsvdir/current
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</pre>
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Copy the contents of <tt>/service/</tt> to
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<tt>/etc/runit/runsvdir/current/</tt> and replace <tt>/service/</tt>
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with a symbolic link:
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<pre>
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# cp -pR /service/* /etc/runit/runsvdir/current/
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# mv -f /service /service.old && \
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ln -s /etc/runit/runsvdir/current /service
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</pre>
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You have now created two runlevels: <tt>default</tt> and <tt>single</tt>.
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The <tt>current</tt> runlevel is <tt>default</tt>.
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It is safe to remove <tt>/service.old/</tt> if you don't need it anymore.
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<p>
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Finally edit <tt>/etc/runit/2</tt> to set the <tt>default</tt> runlevel when
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stage 2 starts:
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<pre>
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$ cat /etc/runit/2
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#!/bin/sh
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PATH=/command:/usr/local/bin:/usr/local/sbin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/X11R6/bin
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<b>runsvchdir default >/dev/null</b>
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exec env - PATH=$PATH \
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runsvdir /service 'log: ...........................................................................................................................................................................................................................................................................................................................................................................................................'
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</pre>
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<hr>
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<a name="switch"><h3>Switching runlevels</h3></a>
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Switching runlevels with <i>runit</i> is done by switching the directory the
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<a href="runsvdir.8.html">runsvdir</a> program is running in.
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This is done by the <a href="runsvchdir.8.html">runsvchdir</a> program, e.g.
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to switch to the <tt>single</tt> user runlevel, do:
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<pre>
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# runsvchdir single
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</pre>
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To switch back to the <tt>default</tt> runlevel, do:
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<pre>
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# runsvchdir default
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</pre>
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See <a href="runsvdir.8.html">the runsvdir program</a> for a description of
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what happens when <i>runsvdir</i> sees the directory changed.
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Note that there is no guarantee that all services from the <tt>previous</tt>
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runlevel will stop, the <a href="runsv.8.html">runsv</a> processes have sent
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the service daemons a SIGTERM and wait for them to terminate.
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You can check the status of the <tt>previous</tt> runlevel through
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<tt>/etc/runit/runsvdir/previous/</tt>.
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<hr>
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<a name="create"><h3>Creating new runlevels</h3></a>
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To create a new runlevel, simply create a new directory in
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<tt>/etc/runit/runsvdir/</tt>.
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The name of the directory is the name of the new runlevel.
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The name must not start with a dot and must not be <tt>current</tt>,
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<tt>current.new</tt>, or <tt>previous</tt>, e.g.:
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<pre>
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# mkdir /etc/runit/runsvdir/maintenance
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</pre>
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Add the services you want to run in the runlevel <tt>maintenance</tt> to the
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newly created directory, e.g.:
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<pre>
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# ln -s /etc/sv/getty-5 /etc/runit/runsvdir/maintenance/
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# ln -s /etc/sv/ssh /etc/runit/runsvdir/maintenance/
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# ln -s /etc/sv/dnscache /etc/runit/runsvdir/maintenance/
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</pre>
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If you want to switch to the runlevel <tt>maintenance</tt>, do:
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<pre>
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# runsvchdir maintenance
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</pre>
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<hr>
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<address><a href="mailto:pape@smarden.org">
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Gerrit Pape <pape@smarden.org>
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</a></address>
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</body>
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</html>
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