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Operating Systems AIX init not starting processes from inittab Post 302278400 by hybr1d on Tuesday 20th of January 2009 06:04:57 AM
Old 01-20-2009
init not starting processes from inittab

Hello,

I'm having a problem starting the cron daemon automatically from inittab, let me provide the details below:

We are having five equally installed machines. One of them was upgraded in the past, one we upgraded recently, both from 5300-05-06 to 5300-07-01-0748. On the upgraded machine cron is not starting automatically from inittab, otherwise it is running perfectly fine. While trying to figure out the root of the cause, I tried running dummy script from inittab - it didn't start, too (and ran with no problem on another machine). Strange enough, the other system processes are starting just fine. Then I installed the last system backup on another machine and upgraded to TL6 first. Again, it didn't start on TL6. I compared all the installed packages and inittab head to head on the two 5300-07 machines (one working and one - not) - and they were equal. As far as I know, the problem existed on the first machine, but was fixed by a former SA. Unfortunately, due to poor documenting at his side, we don't know how and now we are trying to solve it (sounds familiar, doesn't it?). I googled and didn't find anything that suits.

For now, I'm using really dirty hack by starting cron from the rc.tcpip script, but this is certainly not an acceptable long-term solution. By Murphy's law, there are important scripts running from cron almost every minute.

I'll be really grateful if you can help me track the problem, please tell me if you need more specific data. Thanks in advance.
 

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INITSCRIPT(5)						Linux System Administrator's Manual					     INITSCRIPT(5)

NAME
initscript - script that executes inittab commands. SYNOPSIS
/bin/sh /etc/initscript id runlevels action process DESCRIPTION
When the shell script /etc/initscript is present, init will use it to execute the commands from inittab. This script can be used to set things like ulimit and umask default values for every process. EXAMPLES
This is a sample initscript, which might be installed on your system as /etc/initscript.sample. # # initscript Executed by init(8) for every program it # wants to spawn like this: # # /bin/sh /etc/initscript <id> <level> <action> <process> # # Set umask to safe level, and enable core dumps. umask 022 ulimit -c 2097151 PATH=/bin:/sbin:/usr/bin:/usr/sbin export PATH # Increase the hard file descriptor limit for all processes # to 8192. The soft limit is still 1024, but any unprivileged # process can increase its soft limit up to the hard limit # with "ulimit -Sn xxx" (needs a 2.2.13 or later Linux kernel). ulimit -Hn 8192 # Execute the program. eval exec "$4" NOTES
This script is not meant as startup script for daemons or somesuch. It has nothing to do with a rc.local style script. It's just a handler for things executed from /etc/inittab. Experimenting with this can make your system un(re)bootable. FILES
/etc/inittab, /etc/initscript. AUTHOR
Miquel van Smoorenburg ,<miquels@cistron.nl> SEE ALSO
init(8), inittab(5). July 10, 2003 INITSCRIPT(5)
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