nginx负载均衡的配置方法

upstream www.***.com { 
    server 192.168.2.72:80; 
    server 192.168.2.4:80; 
    server 192.168.2.5:80;
}
server {
    listen    80;
    server_name  www.***.com;

    #charset koi8-r;

    #access_log  logs/host.access.log  main;

    location / { 
        proxy_pass http://www.***.com; 
        proxy_set_header Host $host; 
        proxy_set_header X-Real-IP $remote_addr; 
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 
}