公司tomcat服务器有个过一段时间自动会挂的bug一直没能解决，挂的时候还要手动重启tomcat，于是决定写个脚本让它定时检测故障自动重启吧。
#!/bin/bash
if [ ! -f /tmp/down_count ];then
echo "0" > /tmp/down_count
fi
code=$(curl -m 5 -L -s -w %{http_code} www.centos.bz -o /dev/null)
if [ "${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
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