Requirements

• NodeJS (https://nodejs.org) - If you decide to follow-along

Generate A Sample Application To Deploy

We are going to be auto-generating a "dummy" application to represent what we want to host. For this use-case, we will be using create-react-app. This is not required, as is simply just a simple use-case for generating a dummy application with unit tests. Feel free to use something like Java, Ruby, etc. If that is your language of choice.

In your Terminal, execute the following commands.

$ npx create-react-app my-sample-application

Creating A Dockerfile For Development

It's good practice to separate development and production Docker. This will allow you to easily iterate locally within a Docker-based environment. When you want to go prod, the pipeline will reference the production-based Dockerfile.

Dockerfile.development

FROM node:alpine

WORKDIR '/app'

COPY package.json .
RUN npm install

COPY . .

CMD ["npm", "run", "start"]

docker-compose-dev.yml

version: '3'
services:
  web:
    stdin_open: true
    build:
      context: .
      dockerfile: Dockerfile.development
    ports:
      - '3000:3000'
    volumes:
      - /app/node_modules
      - .:/app

Now, whenever we want to run our development environment, we can simply execute the following:

docker-compose -f docker-compose-dev.yml up