My HALO jump into containerizing Node.js apps using Docker - [link here]

Dockerfile

# We first specify the image node version we want Docker to grab.
# Docker images live in harmony at Docker Hub (hub.docker.com).
# It still seems to be the easiest way to share images.
FROM node:8
# Below, describes to our soon to be Docker image,
# where to place all the application source code.
WORKDIR /usr/src/app
# We then move on to copying and installing our app's 
# dependencies into the Docker image.
# Notice how, using a wild-card, we've managed to subtly 
# ensure we are copying both: package.json and package-lock.json .

COPY package*.json ./
RUN npm install
# Let's wrap it up by copying all other resources our app requires, # expose the port number 3000 our application is expected to be
# running from, and specify the command to kick-start the app,
# once the image is launched.
COPY . .
EXPOSE 3000
CMD ["npm", "start"]