Simple NodeJS+Docker setup

docker-compose.yml

version: '2'
services:
  app:
    build: .
    volumes:
      - .:/app
    entrypoint: nodemon -L main.js
    ports:
      - 8080:8080

Dockerfile

FROM node:4

# Prepare non-root user and folders
RUN useradd --system --user-group --create-home app && \
    mkdir /app && chown app:app /app
RUN npm install -g nodemon

# Install dependency outside of the app volume
COPY package.json /opt/
RUN cd /opt && npm install
ENV NODE_PATH=/opt/node_modules

VOLUME ["/app"]
USER app
WORKDIR /app
EXPOSE 8080
ENTRYPOINT ["/app/entrypoint.sh"]

main.js

const Hapi = require('hapi');

const server = new Hapi.Server();
server.connection({
    host: '0.0.0.0',
    port: 8080
});

server.route({
    path: '/',
    method: 'GET',
    handler: (req, reply) => {
        reply('Hello!');
    }
});

server.start(err => {
    if (err) {
        console.log(err);
        process.exit(1);
    }
    console.log('Listening on 0.0.0.0:8080');
});

package.json

{
  "name": "nodejs-in-docker",
  "version": "1.0.0",
  "description": "",
  "main": "main.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "hapi": "^13.4.0"
  }
}