bash脚本之软件看门狗示例

#!/bin/sh


# file timestamp to record the heartbeat of spring-rest-server
timestamp=/usr/apache-tomcat-7.0.42/logs/timestamp.log


# timeout 60s
timeout=60000


# error log
stderr=/usr/apache-tomcat-7.0.42/logs/tomcat-watchdog.log


# 1 means need to restart
restart=0


# the error info
errinfo=‘‘


# check whether file exists
if [ -e $timestamp ] ; then
# check whether contains value
if [ -s $timestamp ] ; then
start_time=$(cat $timestamp)
# integer check
if [ 1 -eq `echo $start_time|grep -P "^-?\d+$"|wc -l` ] ; then
end_time=$(expr $(date +‘%s‘) \* 1000)
sub=$(expr $end_time - $start_time - $timeout)
# if the sub value is larger than 0, means timeout
if [ 0 -lt $sub ] ; then
errinfo=$timestamp‘ timestamp timeout.‘
restart=1
fi
else
errinfo=$timestamp‘ contains non-integer.‘
restart=1
fi
else
errinfo=$timestamp‘ doesnt contain value.‘
restart=1
fi
else
errinfo=$timestamp‘ doesnt exist.‘
restart=1
fi


# kill tomcat and restart
if [ 1 -eq $restart ] ; then 
echo $(date +‘%Y-%m-%d %H:%M:%S‘)‘ kill and restart tomcat, cause by : ‘$errinfo >> $stderr
# kill the tomcat process
pid=$(ps ax|grep tomcat|grep -v "grep"|awk ‘{print $1}‘)
echo $pid|while read line
do
if [ "" != "$line" ] ; then
$(kill -9 $line)
fi
done
# start the tomcat
service tomcat start
fi


exit