一个监测并自动重启tomcat6服务的shell脚本

#!/bin/bash
#check tomcat6 status,then restart
#by www.jiaochengji.com
if [ !  -f /tmp/down_count ];then
    echo "0" > /tmp/down_count
fi
curl -I  tomcat-host -o "/tmp/status" >/dev/null 2>&1
code=`awk 'NR==1 {print $2}' /tmp/status`
if [ "${code}" -ge 500 ];then
    down=`expr $(cat /tmp/down_count) + 1`
    echo "$down" > /tmp/down_count
    if [ "$down" -gt 3 ];then
        if [ ! -f "/tmp/restart_count" ];then
            echo "0" > /tmp/restart_count
        fi
        restart_count=`expr $(cat /tmp/restart_count) + 1`
        echo "$restart_count" > /tmp/restart_count
        if [ "$restart_count" -le 2 ];then
                echo "tomcat down at `date`" >> /tmp/down_info
                /etc/init.d/tomcat6 restart
        fi
    fi
else
    echo "0" > /tmp/down_count
    echo "0" > /tmp/restart_count
fi