• Initialize an empty bun app

bun init

• Add express to it

bun add express @types/express

• Write a basic node.js app

import express from "express";

const app = express();

app.get("/cpu", (req, res) => {
	for (let i = 0; i < 100000000; i++) {
		Math.random();
	}
	res.send("Hello world");
});

app.get("/", (req, res)=>{
    // health check
    res.send("hii");
})

app.listen(3000)

• Create the dockerfile

FROM oven/bun:alpine

WORKDIR /app

COPY . .

RUN bun install

CMD ["bun", "run", "index.ts"]

• Build the dockerfile

docker build -t node-app .
// mac M1 people should add --platform=linux/amd64

• Try running it locally

docker run -p 3000:3000 node-app