Nginx实现负载均衡的配置步骤

http {  
    upstream backend_servers {  
        server backend1.example.com;  
        server backend2.example.com;  
        server 192.168.1.1 backup; # 作为备份服务器  
    }  
  
    server {  
        listen 80;  
  
        location / {  
            proxy_pass http://backend_servers; # 将请求转发到backend_servers组中的某个服务器  
            proxy_set_header Host $host;  
            proxy_set_header X-Real-IP $remote_addr;  
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;  
        }  
    }  
}

upstream backend_servers {  
    least_conn;  
    server backend1.example.com;  
    server backend2.example.com;  
}

worker_processes  1;

events {
    worker_connections  1024;
}

http {
    include       mime.types;
    default_type  application/octet-stream;

    sendfile        on;
	
    keepalive_timeout  65;

    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;
        }
    }

}

worker_processes  1;

events {
    worker_connections  1024;
}

http {

	# 三台服务主机
	upstream test {
		server 127.0.0.1:8081;
		server 127.0.0.1:8082;
		server 127.0.0.1:8083;
	}
	
    include       mime.types;
    default_type  application/octet-stream;

    sendfile        on;
	
    keepalive_timeout  65;

    server {
        listen       80;
        server_name  localhost;

        location / {
            root   html;
            index  index.html index.htm;
        }
		
		# 代理转发
		location /test {
		   proxy_pass http://test;
        }

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

}

./nginx -s reload