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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>runit(8) manual page</title>
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<body bgcolor='white'>
<a href='http://smarden.org/pape/'>G. Pape</a><br><a href='index.html'>runit</A><hr><p>
<h2><a name='sect0'>Name</a></h2>
runit - a UNIX process no 1
<h2><a name='sect1'>Synopsis</a></h2>
<b>runit</b>
<h2><a name='sect2'>Description</a></h2>
<b>runit</b> must be run
as Unix process no 1. It performs the system’s booting, running, and shutdown
in three stages:
<h2><a name='sect3'>Stage 1</a></h2>
<b>runit</b> runs <i>/etc/runit/1</i> and waits for it to terminate.
The system’s one time tasks are done here. <i>/etc/runit/1</i> has full control
of <i>/dev/console</i> to be able to start an emergency shell if the one time
initialization tasks fail. If <i>/etc/runit/1</i> crashes, or exits 100, <b>runit</b>
will skip stage 2 and enter stage 3.
<h2><a name='sect4'>Stage 2</a></h2>
<b>runit</b> runs <i>/etc/runit/2</i>, which
should not return until system shutdown; if it crashes, or exits 111, it
will be restarted. Normally <i>/etc/runit/2</i> starts <i><b>runsvdir</b>(8)</i>. <b>runit</b> is able
to handle the ctrl-alt-del keyboard request in stage 2, see below.
<h2><a name='sect5'>Stage 3</a></h2>
If
<b>runit</b> is told to shutdown the system, or stage 2 returns, it terminates
stage 2 if it is running, and runs <i>/etc/runit/3</i>. The systems tasks to shutdown
and possibly halt or reboot the system are done here. If stage 3 returns,
<b>runit</b> checks if the file <i>/etc/runit/reboot</i> exists and has the execute by
owner permission set. If so, the system is rebooted, it’s halted otherwise.
If <i>/etc/runit/nosync</i> exists, <b>runit</b> doesn’t invoke
sync(). This is useful in vservers.
<h2><a name='sect6'>Ctrl-alt-del</a></h2>
If <b>runit</b> receives the ctrl-alt-del keyboard request and the file
<i>/etc/runit/ctrlaltdel</i> exists and has the execute by owner permission set,
<b>runit</b> runs <i>/etc/runit/ctrlaltdel</i>, waits for it to terminate, and then sends
itself a CONT signal.
<h2><a name='sect7'>Signals</a></h2>
<b>runit</b> only accepts signals in stage 2. <p>
If <b>runit</b>
receives a CONT signal and the file <i>/etc/runit/stopit</i> exists and has the
execute by owner permission set, <b>runit</b> is told to shutdown the system. <p>
if
<b>runit</b> receives an INT signal, a ctrl-alt-del keyboard request is triggered.
<h2><a name='sect8'>See Also</a></h2>
<i>runit-init(8)</i>, <i>runsvdir(8)</i>, <i>runsvchdir(8)</i>, <i>sv(8)</i>, <i>runsv(8)</i>, <i>chpst(8)</i>,
<i>utmpset(8)</i>, <i>svlogd(8)</i> <p>
<i>http://smarden.org/runit/</i>
<h2><a name='sect9'>Author</a></h2>
Gerrit Pape <pape@smarden.org>
<p>
<hr><p>
<a name='toc'><b>Table of Contents</b></a><p>
<ul>
<li><a name='toc0' href='#sect0'>Name</a></li>
<li><a name='toc1' href='#sect1'>Synopsis</a></li>
<li><a name='toc2' href='#sect2'>Description</a></li>
<li><a name='toc3' href='#sect3'>Stage 1</a></li>
<li><a name='toc4' href='#sect4'>Stage 2</a></li>
<li><a name='toc5' href='#sect5'>Stage 3</a></li>
<li><a name='toc6' href='#sect6'>Ctrl-alt-del</a></li>
<li><a name='toc7' href='#sect7'>Signals</a></li>
<li><a name='toc8' href='#sect8'>See Also</a></li>
<li><a name='toc9' href='#sect9'>Author</a></li>
</ul>
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</html>
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