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The following brings you what is Wesocket Load Balancer based on Nginx. I hope it can bring some help to you in practical application. Load Balancer involves many things, but there are not many theories. There are many books on the Internet. Today, we will use the accumulated experience in the industry to make an answer.

Share a NginxWesocket-based Load Balancer.

1. Install nginx on Mac PC

brew install nginx

2. After installation nginx configuration file path

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

3. Edit configuration files for configuration

In the http block

new configuration

#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";

}

}

nginx listens on port 2048 and forwards requests to qa.server.h, qa.server.test

Client connects via this address: ws://localhost:2048/ws

There has been a question before, why should ws be proxied through http?

The handshake part of ws protocol borrows http protocol, and after the handshake is completed, the protocol is switched (upgrade of header part).

This View Network Connection

Request URL:

ws://localhost:2048/ws

Request Method:

GET

Status Code:

101 Switching Protocols

Response Headersview source

Connection:

upgrade

Date:

Fri, 15 Sep 2017 01:48:28 GMT

sec-websocket-accept:

r+ZclgKaM7r9b6RklYinaGUcvwE=

Server:

nginx/1.12.1

upgrade:

websocket

Request Headersview source

Accept-Encoding:

gzip, deflate, br

Accept-Language:

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

Cache-Control:

no-cache

Connection:

Upgrade

Host:

localhost:2048

Origin:

http://localhost:8000

Pragma:

no-cache

Sec-WebSocket-Extensions:

permessage-deflate; client_max_window_bits

Sec-WebSocket-Key:

yoh4s/VG9x099oJEoP4FNA==

Sec-WebSocket-Version:

13

Upgrade:

websocket

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

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