内核升级

    搭好跳板机后：

#添加yum源
for ip in `cat ip.list2`;do scp rhel-server-5.4-x86_64.repo root@$ip:/etc/yum.repos.d/;done
for ip in `cat ip.list2`;do ssh $ip "yum clean all;yum -y update kernel";done
#检查一下
for ip in `cat ip.list2`;do ssh $ip "cat /etc/grub.conf|grep -E 'default|title'";done
#重启生效
for ip in `cat ip.list2`;do ssh $ip "reboot";done