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Cron job and shell script to kill a process if memory gets to high

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# 8  
Old 04-05-2012
do you specifically want to monitor java memory consumption for 80% ? or if at any point system memory usage shoots over 80% then restart java, irrespective of how much memory java is consuming
# 9  
Old 04-05-2012
It's really java that is causing the Nagios alerts. Java eventually creeps up to 100% of it's allotted utilization.

***** Nagios *****

Notification Type: PROBLEM

Memory WARNING - 82.9% (857524 kB) used
# 10  
Old 04-05-2012
try this instead

Code:
if [ `ps aux | grep java | sort -r -k4 | head -1 | awk '{print $4}'` > 80 ];then
<restart service>
fi

# 11  
Old 04-06-2012
Thanks so much. I'll definitely give that a try.
# 12  
Old 04-09-2012
Didn't seem to work. Restarted the daemon regardless of memory usage. Didn't see any output as to why.

Here's what I put in shell script:

Code:
#!/bin/sh

#  Restart WHD if memory usage hits 80% or higher
#  

if [ `ps aux | grep java | sort -r -k4 | head -1 | awk '{print $4}'` > 80 ];then
/usr/local/webhelpdesk/whd restart
fi
exit 0

Last edited by methyl; 04-09-2012 at 03:55 PM.. Reason: please use code tags
# 13  
Old 04-09-2012
The > 80 will create a file called 80 (check your directory).

Have you tried:
Code:
#!/bin/sh

#  Restart WHD if memory usage hits 80% or higher
#  

if [ `ps aux | grep java | grep -v "grep" | sort -r -k4 | head -1 | awk '{print $4}'` -gt 80 ];then
/usr/local/webhelpdesk/whd restart
fi
exit 0

Beware that a process exceeding 80% memory (assuming that this is what your version of ps displays in field 4? ... very unlikely?) on a spot check is nothing unusual unless your system has a memory issue.

Please post your Operating System and version and the Shell which you are using along with a representative sample of ps -aux|grep "java"|grep -v "grep" , complete with column headings (extracted from ps -aux). There is much variation in the ps command.
Last edited by methyl; 04-09-2012 at 04:28 PM..
This User Gave Thanks to methyl For This Post:
47shailesh
# 14  
Old 04-09-2012
my bad, @methyl you are right
Last edited by 47shailesh; 04-09-2012 at 04:58 PM.. Reason: correction
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