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- <title>Petter Reinholdtsen: What should start from /etc/rcS.d/ in Debian - almost nothing?</title>
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- <h1>
- <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
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-
- <div class="entry">
- <div class="title">What should start from /etc/rcS.d/ in Debian - almost nothing?</div>
- <div class="date">2011-07-30 14:00</div>
- <div class="body">
-<p>In the Debian boot system, several packages include scripts that
-are started from /etc/rcS.d/. In fact, there is a bite more of them
-than make sense, and this causes a few problems. What kind of
-problems, you might ask. There are at least two problems. The first
-is that it is not possible to recover a machine after switching to
-runlevel 1. One need to actually reboot to get the machine back to
-the expected state. The other is that single user boot will sometimes
-run into problems because some of the subsystems are activated before
-the root login is presented, causing problems when trying to recover a
-machine. A minor point is that moving more scripts out of rcS.d/ and
-into the other rc#.d/ directories will increase the amount of scripts
-that can run in parallel during boot, and thus increase the speed
-time.</p>
-
-<p>So, which scripts should start from rcS.d/. In short, only the
-scripts that _have_ to execute before the root login prompt is
-presented during a single user boot should go there. Everything else
-should go into the numeric runlevels. This means things like
-lm-sensors, fuse and x11-common should not run from rcS.d, but from
-the numeric runlevels. Today in Debian, there are around 115 init.d
-scripts that are starte from rcS.d/, and most of them should be moved
-out. Do your package have one of them? Please help us make single
-user and runlevel 1 better by moving it.</p>
-
-<p>Scripts setting up the screen, keyboard, system partitions
-etc. should still be started from rcS.d/, but there is for example no
-need to have the network enabled before the single user login prompt
-is presented.</p>
-
-<p>As always, things are not so easy to fix as they sound. To keep
-Debian systems working while scripts migrate, the scripts need to be
-moved from rcS.d/ to rc2.d/ in reverse dependency order, ie the
-scripts that nothing in rcS.d/ depend on must be moved first, and then
-this migration must be done sequencially while we ensure that the
-package system upgrade packages in the right order to keep the system
-state correct. This will require some coordination when it comes to
-network related packages, but most of the packages with scripts that
-should migrate do not have anything in rcS.d/ depending on them. Some
-packages have already been updated, like the sudo package, while
-others are still left to do. I wish I had time to work on this
-myself, but real live constrains make it unlikely that I will find
-time to push this forward.</p>
-</div>
-
- <div class="tags">Tags: <a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem</a>, <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>.</div>
-
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-<h2>Archive</h2>
-<ul>
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-<li>2011
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-<li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
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