Nginx +keepalived+varnish+lamp實作高可用、負載均衡叢集 描述：
1、前端兩台NGINX，通過keepalived虛拟IP漂移，實作前端兩台NGINX高可用；
2、利用NGINX反向代理功能對後端varnish實作高可用叢集,
3、再通過varnish實作動靜分離
注：1、先裝Nginx +keepalived
2、裝varnish
3、裝lamp
需要6台虛拟機（100-101裝Nginx +keepalived：100主，101備）需要聯網（102-103裝varnish）需要聯網（104-105裝lamp）需要聯網
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