分享一个基于NginxWesocket的负载均衡。

1.在mac电脑安装nginx

brew install nginx

2.安装完成以后nginx的配置文件路径

/usr/local/etc/nginx/nginx.conf

3.编辑配置文件进行配置

在http块

新增配置

#gzip  on;

map $http_upgrade $connection_upgrade {

default upgrade;

'' close;

}

upstream ws_server {

server qa.server.com:2048;

server qa.server.ai:2048;

}

server {

listen   2048;

server_name localhost;

location /ws {

proxy_pass http://ws_server/ws;

proxy_redirect off;

proxy_http_version 1.1;

proxy_set_header Upgrade $http_upgrade;

proxy_set_header Connection "upgrade";

}

}

简要说明一下，nginx监听2048端口，把请求转发到qa.server.h，qa.server.test

客户端通过这个地址 连接：ws://localhost:2048/ws

之前一直有疑问，为什么ws协议要通过http协议来代理？

ws 协议的握手部分是借用http协议了，在握手完成以后进行了协议的切换（header部分的upgrade）。

这个查看网络连接

1. 1. Request URL:

      ws://localhost:2048/ws

   2. Request Method:

      GET

   3. Status Code:

   4. 101 Switching Protocols

2. Response Headersview source

   1. Connection:

      upgrade

   2. Date:

      Fri, 15 Sep 2017 01:48:28 GMT

   3. sec-websocket-accept:

      r+ZclgKaM7r9b6RklYinaGUcvwE=

   4. Server:

      nginx/1.12.1

   5. upgrade:

      websocket

3. Request Headersview source

   1. Accept-Encoding:

      gzip, deflate, br

   2. Accept-Language:

      en-US,en;q=0.8,zh-CN;q=0.6,zh;q=0.4

   3. Cache-Control:

      no-cache

   4. Connection:

      Upgrade

   5. Host:

      localhost:2048

   6. Origin:

      http://localhost:8000

   7. Pragma:

      no-cache

   8. Sec-WebSocket-Extensions:

      permessage-deflate; client_max_window_bits

   9. Sec-WebSocket-Key:

      yoh2s/VG9x099oJEoP4FNA==

   10. Sec-WebSocket-Version:

       13

   11. Upgrade:

       websocket

   12. User-Agent:

       Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36