nginx 负载均衡 轮询算法

weight是权重，权重越大，被访问的次数越多，权重分配建议给性能更强的服务器分配更大的权重，配置一样不建议更改权重。

worker_processes  1;
events {
    worker_connections  1024;
}

http {
    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;
    keepalive_timeout  65;

	#监听浏览器访问localhost:80端口的服务
    server {
        listen       80;
        server_name  localhost;

        location / {
            root   html;
            index  index.html index.htm;
        }

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }

	#轮询访问81、82端口
	upstream demo {
		server localhost:81 weight=1;
		server localhost:82 weight=1;
	}
	
	#监听浏览器访问localhost:8080端口的服务
	server {
        listen       8080;
        server_name  localhost;
		
        location / {
        	#必须加http://变量名，变量名必须在server外面，http{}里面定义upstream 变量名
            proxy_pass   http://demo;
        }

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }
}