Apache
至少需三台服务器：
服务器A：控制服务器
服务器B和服务器C：实际执行服务器
负载均衡原理：将访问服务器A的请求分发至服务器B和服务器C
修改服务器A上apache的http.conf文件：
首先，加载相应的代理模块，去掉以下模块前面的#号：
LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_ajp_module modules/mod_proxy_ajp.so
LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
LoadModule proxy_connect_module modules/mod_proxy_connect.so
LoadModule proxy_ftp_module modules/mod_proxy_ftp.so
LoadModule proxy_http_module modules/mod_proxy_http.so
其次，在文件末尾添加：
ProxyPass /example/ balancer://proxy/
BalancerMember http://serverB/example/
BalancerMember http://serverC/example/
表示将访问服务器A的http://serverA/example/子目录下的所有文件分发至服务器B和C执行，相当于访问http://serverB/example/或http://serverC/example/子目录下的文件。
若写成：
ProxyPass / balancer://proxy/
BalancerMember http://serverB/
BalancerMember http://serverC/
则代表所有访问A的请求都相应的转成访问B或C
最后，重启服务器A的apache
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