centos 6.5
nginx 1.4.4
/etc/nginx/conf.d 下创建tornado.conf    

upstream tornado {
        server 127.0.0.1:8887;
        server 127.0.0.1:8888;
        server 127.0.0.1:8889;
    }     
    server {
        listen 8090;
        location / {
            proxy_pass_header Server;
            proxy_set_header Host $http_host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Scheme $scheme;
            proxy_pass http://tornado;
        }
    }