topic Re: Shell Scripts for monitoring and starting the process in Operating System - Linux

Shell Scripts for monitoring and starting the process

Shivkumar — Tue, 27 Mar 2007 15:26:40 GMT

Hi,

I want to monitor a process and whenever it stops we should receive email notification and execute the command
for starting the process.

For example: i want to monitor the process name "tulip-web-admin". Once it is found that
the process is not running then it should send email notification and start /opt/somedirectory/tulip.sh script.

And we should receive the email notification that process has been re-started.

Can any one suggest korn shell script for this ?

Thanks,
Shiv

Re: Shell Scripts for monitoring and starting the process

A. Clay Stephenson — Tue, 27 Mar 2007 15:37:47 GMT

Okay, here goes:

#!/usr/bin/sh (or #!/usr/bin/ksh if you insist)

typeset PROCESS-"tulip-web-admin"
typeset -i STAT=0

UNIX95=1 ps -C "${PROCESS}" -o pid='' > /dev/null 2>&1
STAT=${?}
if [[ ${STAT} -ne 0 ]]
then
/opt/somedirectory/tulip.sh # you may ned a & to start in background ?
STAT=${?}
echo "Restarted" | mail mickey@mouse.com
fi
exit ${STAT}

You then cron this script to run every 5 minutes or so.

Generally this is a Mickey Mouse solution because it appears that you are trying to fix the symptoms rather than fixing the problem itself --- ie, why is the process dying?

Re: Shell Scripts for monitoring and starting the process

Shivkumar — Tue, 27 Mar 2007 15:41:45 GMT

Clay, Is it possible to check continuously without putting this script in the crobtab ?

Re: Shell Scripts for monitoring and starting the process

A. Clay Stephenson — Tue, 27 Mar 2007 16:01:04 GMT

Yes, although the typical approach there is to create an inittab entry and make it a 'respawn' task. Each time the task exits, init automatically restarts it.

There are several ways to do what you want but continuously running ps could impose an abnormal load on the system.

-------------------------------------------
typeset PROCESS-"tulip-web-admin"
typeset -i STAT=0
typeset -i DELAY=10

while [[ 1 -eq 1 ]]
do
UNIX95=1 ps -C "${PROCESS}" -o pid='' > /dev/null 2>&1
STAT=${?}
if [[ ${STAT} -ne 0 ]]
then
/opt/somedirectory/tulip.sh # you may ned a & to start in background ?
STAT=${?}
echo "Restarted" | mail mickey@mouse.com
fi
sleep ${DELAY}
done
exit ${STAT}

---------------------------------------

This would check every ${DELAY} seconds.

Here's another approach leveraging wait (and is a bit cleaner):

typeset -i CHILD=0
while [[ 1 -eq 1 ]]
do
/opt/somedirectory/tulip.sh &
CHILD=${!}
wait ${CHILD}
echo "Restarted" | mail mickey@mouse.com
done

Either of these scripts should be put set up as an rc'ed command so that this is the sole means of starting the script. HOWEVER, you still seem to be fixing symptoms of a bad application.

Re: Shell Scripts for monitoring and starting the process

A. Clay Stephenson — Tue, 27 Mar 2007 16:02:47 GMT

By the way, the production version of these scripts should have a trap that would 1) kill the tulip-web-admin process and 2) terminate the monitor script. This part is left as an exercise.

Re: Shell Scripts for monitoring and starting the process

Veeru_1 — Wed, 28 Mar 2007 11:47:41 GMT

Hi!

I have been developing a new tool - sentinel - which does what you want (and more) and I am looking for beta testers for it.

Could you send me your contact so that I could give you instructions on how to use it? It comes bundled with WDB 5.6 and later available on the web, but is not an officially supported tool until we can understand its use needs.

Thanx!
Veeru@hp.com

Re: Shell Scripts for monitoring and starting the process

Shivkumar — Wed, 28 Mar 2007 11:50:40 GMT

Hi Veeru,

Please email me on:

sksonkar@gmail.com

Thanks,
Shiv

Re: Shell Scripts for monitoring and starting the process

James R. Ferguson — Wed, 28 Mar 2007 12:54:18 GMT

Hi Shiv:

Shame on you! You asked this very question last year. If you examine the very rich number of question and responses associated with YOUR profile:

https://forums1.itrc.hp.com/service/forums/publicProfile.do?userId=CA1283218&forumId=1

...then you would find:

https://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=996430

...from January 2006 which answered this question!!!

Regards!

...JRF...

Re: Shell Scripts for monitoring and starting the process

Dennis Handly — Wed, 28 Mar 2007 14:33:23 GMT

>JRF: You asked this very question last year

Except I noticed it and told Veeru about it. :-)

Re: Shell Scripts for monitoring and starting the process

Shivkumar — Wed, 28 Mar 2007 17:39:48 GMT

James,

I changed my job and was not able to trace the earlier responses. Unfortunately, after posting the question i came to know how to look for the previous responses.

I apologize with the forum members.

Best Regards,
Shiv

Re: Shell Scripts for monitoring and starting the process

Steven E. Protter — Wed, 28 Mar 2007 18:14:26 GMT

Shalom Shiv,

One of the things I use my forums profile is to find good threads from the past.

When I find a thread that is really good, I add it to my ITRC favorites. Two reasons:

1) So I can use the thread to handle a situation I don't often have to perform. Memory aid really.

2) So I can cut and paste code or a thread link for answering ITRC questions.

An example of number 2 is the mirror with mirror/ux post I often use. It comes from my forums favorite.

Don't worrry about the mistake, I make more than my share posting replies.

No need to point this post, just don't want you to feel so bad.

All is forgiven. By me, I don't speak for others.

The question did seem very familiar to me.

:-)

SEP

Re: Shell Scripts for monitoring and starting the process

James R. Ferguson — Wed, 28 Mar 2007 19:06:12 GMT

Hi (again) Shiv:

Remembering every detail, or even how to do something, is less important than learning *how* to find an answer.

Sometimes the "how" is searching manpages and *trying* to write something that fits your needs and solves a problem. Perfection is an endless journey.

The Chinese say, "Give a man a fish and you feed him for a day. Teach a man to fish and you feed him for a lifetime."

Take my gentle admonishment in my first response in the manner I intended it: an encouragement to fish.

You need not award points for this.

Regards to you, Shiv!

...JRF...