Build a docker Image

Steps

• Create a file in root directory of the project

• Add in these contents

  • Base Image
    FROM node:14
  • Create app working directory
    WORKDIR /usr/src/app
  • Copy Dependencies
  ​​​​COPY package*.json ./
  ​​​​COPY yarn.lock ./
  

  • Install dependencies
    RUN npm install
  • Copy other source files
    COPY . .
  • Expose a port if required
    EXPOSE 8080
  • Run program
    CMD ["node","index.js"]

• Should look like

# Base Image
FROM node:14

# Create app directory
WORKDIR /usr/src/app


# Install app dependencies
# A wildcard is used to ensure both package.json
# AND package-lock.json are copied
# where available (npm@5+)
COPY package*.json ./
COPY yarn.lock ./


## Install dependencies
RUN npm install
# If you are building your code for production
# RUN npm ci --only=production

# Bundle app source
COPY . .

# expose port
EXPOSE 8080

# last command to execute the node program `node index`
CMD [ "node", "index.js" ]

• Create a .dockerignore file in the same directory

node_modules
npm-debug.log

• Building image

Go to the directory that has your Dockerfile and run the following command to build the Docker image. The -t flag lets you tag your image so it's easier to find later using the docker images command:

docker build . -t <your username>/node-web-app

• Check and list your docker images

docker images

• Run your image

docker run -p 49160:8080 -d <your username>/node-web-app

• Limit CPU or other resources

$ docker run --cpus=2 -m 512m <image>