Automatic Heap Dump generation in Weblogic

Now a days getting a heap dump at the right time to analyse is very crucial. So to tackle this problem of getting a automatic heap dump generation at the exact right time when the heap free in server is below some specified threshold this script was written.

autoheapdump.sh

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#!/bin/bash
WL_DOMAIN="/opt/user_projects/domains/hell20tprod_domain"
JAVA_BIN="/opt/bea/jdk1.5.0_15/bin"
MS_NAME=hell20tprod
threshold=20
LOG_DIR="$WL_DOMAIN/servers/$MS_NAME/logs"
while true; do
MS_PID=`ps auxw |grep java |grep $MS_NAME |awk '{print $2}'`
SCRIPT_LOG="$LOG_DIR/heap_dump.log"
if [ ! -f Count.log ]
then
 touch Count.log
fi
Count=`cat Count.log`
GcMonC=`grep "weblogic.GCMonitor" $LOG_DIR/$MS_NAME.log | wc -l` 
grep "weblogic.GCMonitor" $LOG_DIR/$MS_NAME.log | wc -l > Count.log
free=`grep "weblogic.GCMonitor" $LOG_DIR/$MS_NAME.log | tail -1 | cut -d "<" -f14 | cut -d "%" -f1`
if [[ $free -lt $threshold && $GcMonC -gt $Count ]];
then
echo "Free memory on `hostname` has dropped below to $free%, Starting Heap dump Process" | mailx -s "Starting Heap Dump on `hostname`" "weblogicadmin[at]techpaste.com,admin1[at]techpaste.com"
$JAVA_BIN/jmap -heap:format=b $MS_PID >> $SCRIPT_LOG 
mv heap.bin $LOG_DIR/heap_$MS_NAME`date +%m%d%Y_%H%M`.bin
sleep 900
fi;
done

Here

WL_DOMAIN – is the weblogic domain path

JAVA_BIN – path till bin directory of java installation for weblogic, which contains jmap tool for heap dump.

MS_NAME – Manage Server Name from which heap dump required.

threshold – The limit from where the heap dump will get triggered. here we have 20% free is given as threshold to take heap dump.

LOG_DIR – it is the directory where managed server logs are stored and heap dump file also will get stored there.

SCRIPT_LOG – The directory where the script run log will get stored.

To run this script you can use crontab or just by issuing nohup ./autoheapdump.sh &

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