监控apache脚本：
1、每十分钟检查apache是否正常运行
分析：进程在运行如何判断
1）lockfile是否存在
2）pid是在后台存在
3）能否正常访问页面

2、如果apache运行不正常（进程死亡、页面访问也不正常等情况），
需要脚本能够通过重启apache进程来恢复正常。
分析：
1）先恢复后报警
2）如何恢复
3）如何报警

3、当apache故障时能通过邮件及短信报警，当apache故障恢复后能够通知管理员
1）重新检查apache是否正常
2）如果正常发信息告诉管理员已经自动恢复成功
3）如果apache还是不正常，发信息告知管理上线手工修复

#!/bin/bashif [ -f /var/lock/subsys/httpd ]
thenexport pid=`cat /var/run/httpd/httpd.pid`ps -p $pid | grep httpd &> /dev/nullREL1=$?elinks -dump http://localhost/ok.html &> /dev/nullREL2=$?if [ 0 -eq $REL1 ] && [ 0 -eq $REL2  ]then: elsepkill -9 httpdservice httpd restart &> /dev/nullREL3=$?echo "httpd is not OK" | mail -s "httpd is not ok" root@localhostsleep 3sif [ $REL3 -eq 0 ]thenecho "httpd is recovered OK" |  mail -s "httpd is recovered ok" root@localhostelseecho "httpd is recovered not OK,please login your server and recover by yourself" | mail -s "httpd is recovered not ok" root@localhostfifi
elseservice httpd start &> /dev/nullREL4=$?echo "httpd is not OK" | mail -s "httpd is not ok" root@localhostsleep 3sif [ $REL4 -eq 0 ]thenecho "httpd is recovered OK" |  mail -s "httpd is recovered ok" root@localhostelseecho "httpd is recovered not OK,please login your server and recover by yourself" | mail -s "httpd is recovered not ok" root@localhostfifi

*/10 * * * * sh httpd.sh