artemr87/lbalancer-app repository overview

For running container :

sudo docker run -p 8080:8080 -p 8081:8081 -p 8082:8082 -p 8083:8083 -p 8084:8084 lbalancer-app

This example demonstrated how to use Nginx to load balance traffic. Provision n backend servers running the Node.js application (running multiple instances with a service monitor like forever). I am used a predefined number of backend servers. After running the container, you can check Nginx’s load balancing by running: curl http://localhost:8080⁠ You can check if all four Node.js instances are running using forever list: forever list (output should be like:

info: Forever processes running data: uid command script forever pid id logfile uptime
data: [0] 4Ov0 /usr/bin/node /app/app.js 8081 18 32 /root/.forever/4Ov0.log 0:0:0:45.477 data: [1] apag /usr/bin/node /app/app.js 8082 43 57 /root/.forever/apag.log 0:0:0:45.252 data: [2] Cvz9 /usr/bin/node /app/app.js 8083 67 82 /root/.forever/Cvz9.log 0:0:0:45.074 data: [3] 2ir0 /usr/bin/node /app/app.js 8084 93 102 /root/.forever/2ir0.log 0:0:0:44.921

) and, finally you can test it by : autocannon -c 100 -d 10 http://localhost:8080⁠ (at first you need to install autocannon by npm install -g autocannon), for this purpose Node.js running simple testing app.js files :

import { createServer } from 'http'

const { pid } = process

const server = createServer((req, res) => { let i = 1e7; while (i > 0) { i-- }

console.log(Handling request from ${pid}) res.end(Hello from ${pid}\n) })

const port = Number.parseInt( process.env.PORT || process.argv[2] ) || 8080

server.listen(port, () => console.log(Started at ${pid}))