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timday
Asked: 2010-04-19 01:26:33 +0800 CST

Rebuilding /etc/rc?.d/ links

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A regular filesystem check on a Debian Lenny system triggered an fsck, and that nuked a handful of links in the /etc/rc?.d hierarchy (unfortunately I didn't keep a list).

The system seems to boot and run normally, but I'm worried its storing up trouble for the future.

Is there an easy (fairly automatic) way of rebuilding this piece of the system ? As I understand it, the links are generally manipulated by package postinst scripts using update-rc.d (and I haven't made any changes from the installed defaults).

Without any better ideas, my plan is one of:

  • Diff a listing with another similar system to identify which packages need their links repairing.
  • Wait until the system is upgraded to Squeeze (hopefully not too long :^) and assume the mass package upgrade will restore all the missing links.
debian debian-lenny init rc.d runlevel

1 Answers

  1. Best Answer

    If you do not have backups, you could try installing rcconf and see if it will re-create the links. But in reality all Debian init files would have following information at the top of each script:

    ### BEGIN INIT INFO
# Provides:          inetd
# Required-Start:    $local_fs $remote_fs
# Required-Stop:     $local_fs $remote_fs
# Should-Start:      $syslog
# Should-Stop:       $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start or stop the xinetd daemon.
### END INIT INFO

    Based on this information alone you could partially restore everything with some basic shell scripting.

    # Default-Start: 2 3 4 5 tells you that the Start symlinks to this init script should go into /etc/init{2,3,4,5}.d/S<XX>blah.

    # Default-Stop: 0 1 6 means that Kill links do into/etc/init{0,1,6}.d/K<XX>blah.

    The problem here is the <XX> part. This is the order your processes start and stop, so if you do not know the order, you could potentially end up with a hung boot. For example when you are trying to start NFS before the Networking.

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