Nginx +keepalived+varnish+lamp实现高可用、负载均衡集群 描述：
1、前端两台NGINX，通过keepalived虚拟IP漂移，实现前端两台NGINX高可用；
2、利用NGINX反向代理功能对后端varnish实现高可用集群,
3、再通过varnish实现动静分离
注：1、先装Nginx +keepalived
2、装varnish
3、装lamp
需要6台虚拟机（100-101装Nginx +keepalived：100主，101备）需要联网（102-103装varnish）需要联网（104-105装lamp）需要联网
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