For NodeJS App

Dockerfile

# FROM defines the base image, means it defines from what image we want to build it from
# Create a layer from the node:8 Docker Image
FROM node:8

# A LABEL is a key-value pair, used to store information
# Set one/multiple labels on one/multiple lines
LABEL com.example.version="0.1.1-beta" com.example.release-date="2018-12-25"  com.example.version.is-production=""
LABEL vendor1="Medium Incorporated"

# Create the app directory for storing, running package manager and launch app
WORKDIR /usr/src/app

# Copy app dependencies
# from both package.json AND package-lock.json
# to the root of the docker image directory created above
COPY package*.json ./

# Install app dependencies
RUN npm install
# For production, the command should be
# RUN npm install --only=production

# Bundle app source inside Docker image
COPY . .

#  EXPOSE informs Docker that the container listens on the specified network ports at runtime
#  provide access to this isolated docker container
EXPOSE 8080

# Lastly, define the command to run the app 
CMD [ "npm", "start" ]