Art Alexion on 2 Nov 2005 01:42:24 -0000

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Re: [PLUG] Editing System V init

Stephen Gran wrote:

>On Tue, Nov 01, 2005 at 06:11:09PM -0500, Art Alexion said:
>>By default, my distro tries to run an ntp update script before it
>>initializes ppp.  The documentation on the distro web site shows you how
>>to disable the ntp init script, but I don't want to do that.  I want to
>>edit the startup so that it runs _after_ ppp is initialized.
>>I installed the webmin init module, but need to read about the runlevel
>>and 'start at' and 'stop at' settings before I make any changes.  Google
>>hasn't helped me find documentation.  Can anyone recommend a place?
>Without knowing more about what your distro is, I invite you,
>semi-facetiously, to investigate the lovely command 'mv'.  The beauty of
>a simple
>mv /etc/rc2.d/S23ntp /etc/rc2.d/S53ntp
>beats all of webmin, for me.
>On a more serious note, if you know what your distros default run level
>is, just push the ntp start link to something slightly later than the
>ppp start link.  That is the simplest solution.
>The way it works, roughly (and totally solution dependant, but most
>linux distros do it this way these days) is that the kernel boots, and
>at some point hands thing off to init.  init runs all of the scripts
>that start with S in the rcS.d directory, and then switches to the
>'default' run level - what that default is is completely distribution
>dependant, although I think Redhat-alikes all use 5.
>Then init runs all scripts in rc5.d directory that begin with an S with
>the start argument (and really, it should also run all scripts that begin
>with a K with the stop argument, but many don't).  The only real things
>to know about the hacked SysV init that most linux distros use is that
>a) scripts whose names start with S should get run with the start
>   argument
>b) scripts whose names start with K should get run with the stop
>   argument  
>c) All scripts in a directory are run in numerical order
>d) At boot, S is first, then default run level.
>That's the basics for managing it.
That is what is complicated.  The ntpdate script in in rcS.d and the ppp
script is in rc2d through rc5.d.  I fear putting ppp in rcS.d is a bit
too radical and may lead to unintended consequences.

BTW, I am running Kubuntu 5.04 (hoary) which is Debian based.  The only
documentation it points to is chapter 9 of the Debian Policy Manual.


Art Alexion
Arthur S. Alexion LLC

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