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# 1  
Old 05-03-2012
Check hung process and restart

Hi all

I have networker running on a RHEL 5.7 and over time it hangs. So the solution backup team proposed is to check if the process is hung, to stop and start it.

Unfortunately for me, the rc script only allows three commands, start, stop and status (no restart option) so I managed to set following script but when I executed it-even when networker has been stopped I get the OK message in my /var/log/messages. Why is that? Can someone please help me look into this? Where did I go wrong? Sorry I am rushing this, they need to get this setup on prod servers by today at COB...

cmdstop='/etc/rc.d/init.d/networker stop'
cmdstart='/etc/rc.d/init.d/networker start'

if [ "${?}" != 0 ] ; then
 echo "`date` CRITICAL:Networker hung, will be restarted" >>/var/log/messages
echo "`date` OK:Networker running" >>/var/log/messages

# 2  
Old 05-03-2012
This variable assignment:
cmdstart='/etc/rc.d/init.d/networker start'

always succeeds, so $? is always 0
# 3  
Old 05-03-2012

But what is the process hangs? Will it still show 0?
# 4  
Old 05-03-2012
It does not matter if the process hangs, the script does not check for that, it also does not restart the process and all it will do is write "`date` OK:Networker running" into the log.
# 5  
Old 05-03-2012
well, how do I incorporate stop and start into the script that looks for hung process? Smilie
Sorry I am so lost!!
# 6  
Old 05-03-2012
How would you characterize the state as "hung"?

Maybe a better approach is to stop and start it on a regular basis.
# 7  
Old 05-03-2012

I've attached the screenshot of what was done when we last found that the proces was hung...
Check hung process and restart-db2vend-hungjpg

Is it a good idea to stop & start it a regular interval instead? But how do I check with command if the process is hung? I use
ps auxw | grep db2vend

Last edited by hedkandi; 05-03-2012 at 03:28 AM.. Reason: addition

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