Step-by-Step Guide: Building a Web Application with Docker

Table of contents

• Step 1: Create a New Project

• Step 2: Choose Your Framework

• Step 3: Create a Dockerfile

• Step 4: Build Your Docker Image

• Step 5: Run Your Container

Since, we went through most of the docker core concepts, Now lets see how to setup a simple webapp on docker

Step 1: Create a New Project

Create a new directory for your project and initialize it as a Git repository:

Step 2: Choose Your Framework

For this example, we'll use Node.js and Express.js. You can choose any framework you like (e.g., Ruby on Rails, Python Flask) as long as it's compatible with Docker.

Create a new file called app.js in the root directory:

Step 3: Create a Dockerfile

Create a new file called Dockerfile in the root directory:

This Dockerfile uses the official Node.js 14 image, sets the working directory to /app, copies the package.json file, installs dependencies, builds your application, exposes port 3000, and sets the command to start the application.

Step 4: Build Your Docker Image

Run the following command in your terminal:

This command tells Docker to build an image from the Dockerfile and tag it as my-web-app.

Step 5: Run Your Container

Start a new container using the following command:

This command tells Docker to start a new container from the my-web-app image, map port 3000 on your host machine to port 3000 in the container, and run the application.

Additional Resources

• Docker Official Documentation

• Node.js Official Documentation

• Express.js Official Documentation

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