How To Dockerize An Application- Part II

What is Dockerize?

Dockerizing is the process of packing, deploying, and running applications using Docker containers.

Chose a base image

You can start from a Base OS and install everything by yourself. Choose an image based on the used technology, such as Node, Java, Ruby, and Python. I am going to use Node for my hello-world application.

• 1. Create a file hello-world.js

    Console.log("Hello World");
  

• 2. Create a Dockerfile in the root directory with the same name Dockerfile and write the following instructions

    FROM node:alpine
    COPY ./app
    WORKDIR /app
    CMD node app.js
  

  • 3. Build the Docker image from this Dockerfile, you can run the following command from the directory containing the Dockerfile. This will create a Docker image with the tag `hello-world`

      docker build -t hello-world .
    

    • 4. Finally, you can run the Docker container from the image using the following command

        docker run hello-world