This project is a very small express REST application that is containerized so that it can be run on a cluster later on.

Project structure

The files in the project

This project only has a sole dependency: the express framework.

Code from index.js

const express = require('express');
const app = express();

app.get('/', (req, res) => {
	console.log('GET /');
	res.status(200).json({
		message: 'Hello, world. This app should be containerized'
	});
});

app.get('/misc', (req, res) => {
	console.log('GET /misc');
	res.redirect('/');
})

app.listen(8080, () => {
	console.info('Server listening on port 8080');
});

Dockerfile

# Choose a base image with node, npm and yarn pre-installed
FROM node:latest

# App runs on port 8080 so make it available for host to bind
EXPOSE 8080

# Create a distinct directory for the app to live in
RUN mkdir /app
WORKDIR /app

# Make sure all required app dependencies are installed
COPY package.json .
COPY yarn.lock .
RUN yarn

# Copy source code
COPY src/ src/

# Run app
CMD ["node", "src/index.js"]