Create a Docker Image Containing a Node.js Application and Host it on Docker Hub

This is first part we will be “dockerizing” a simple node application and pushing the image to docker hub.

App structure will be simple and look like this.

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We will run a simple node server.

// server.js
const http = require('http')
const port = 3000

const requestHandler = (request, response) => {
  console.log(request.url)
  response.end('Hello Node.js Server!')
}

const server = http.createServer(requestHandler)


server.listen(port, (err) => {
  if (err) {
    return console.log('something bad happened', err)
  }

  console.log(`server is listening on ${port}`)
})

Dockerfile will have the following instructions to build our image.

# Dockerfile
FROM node:latest

# Create app directory
RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app

COPY server.js /usr/src/app

# Bundle app source
COPY . /usr/src/app

EXPOSE 3000

CMD ["node", "server.js"]

Now to build our image using the instructions in our Dockerfile. In our terminal window we will run this command.

docker build -t aldomatic/nodedemo . 

// [1] -t stands for tag, this is where we will name our image aldomatic/nodedemo
// [2] . Tells the docker build to look in the current directory 

If everything checks out after running docker build then if you run docker images, you should see your newly created image.

Now to push our newly created image to https://hub.docker.com/. You will need to create a repository and name it according to docker hub specs.

Here is a link to the repo on docker hub.
https://hub.docker.com/r/aldomatic/nodedemo/