nginx 根据端口不同实现负载均衡

upstream www.abc.com {
    server www.mynginx.com:91;
    server www.mynginx.com:92;
    }
server {
        listen       80;
        server_name  www.mynginx.com;
        location / {
            root   D:/www/mynginx;
            index  index.html index.htm index.php;
               proxy_pass        http://www.abc.com;
                                                proxy_set_header  X-Real-IP  $remote_addr;
        }
        location ~ .php$ {
            root          D:/www/mynginx;
            fastcgi_pass   127.0.0.1:9000;
            fastcgi_index  index.php;
            fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
            include        fastcgi_params;
        }
}
server {
        listen       91;
        server_name  www.mynginx.com:91;
        location / {
            root   D:/www/nginx01;
            index  index.html index.htm index.php;

        }
        location ~ .php$ {
            root          D:/www/nginx01;
            fastcgi_pass   127.0.0.1:9000;
            fastcgi_index  index.php;
            fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
            include        fastcgi_params;
        }
}
server {
        listen       92;
        server_name  www.mynginx.com:92;
        location / {
            root   D:/www/nginx02;
            index  index.html index.htm index.php;
        }
        location ~ .php$ {
            root          D:/www/nginx02;
            fastcgi_pass   127.0.0.1:9000;
            fastcgi_index  index.php;
            fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
            include        fastcgi_params;
        }
}
然后访问http://www.mynginx.com,其实是轮流访问www.mynginx.com:91,www.mynginx.com:92