Nginx 配置：
upstream site {
server 192.168.3.82:8040;
server 192.168.3.82:8041;
}
server {
listen 8080;
server_name 192.168.3.82;
#charset koi8-r;
#access_log logs/host.access.log main;
location / {
root html;
index index.html index.htm;
proxy_pass http://site;
}
这里的切换是按照1:1的方式来回切换，通过配置文件你可以站点的权重：
upstream site {
server 192.168.3.82:8040 weight=2;
server 192.168.3.82:8041 weight=1;
}
