nginx * 负载均衡的做法

项目上使用负载均衡的方法, 感觉最简单的办法其实是 http的 upstream  注意需要保留端口号信息.

worker_processes  4;
events {
    worker_connections  1024;
}

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

    upstream webservers {
        sticky;
        server 10.3.110.60:5200;
        server 10.3.110.61:5200;
    }

    server {
        listen       8081;
        server_name  localhost;
        root         /usr/share/nginx/html;
        proxy_buffer_size   128k;
        proxy_buffers   4 256k;
        proxy_busy_buffers_size   256k;
        proxy_set_header        Host            $host:8081;
        proxy_set_header        X-Real-IP       $remote_addr;
        proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
        location /
        {
            add_header 'Access-Control-Allow-Origin' "$http_origin";
            add_header 'Access-Control-Allow-Credentials' "true";
            proxy_pass http://webservers;
         }
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }
}

注意 listen的端口号 需要与后面的 host的端口号一致起来