Dockerized Simple Web Application

This is a beginner DevOps project where I containerized a simple Node.js Express web application using Docker.

The goal of this project is to understand the basic DevOps workflow of packaging an application into a Docker image and running it as a container locally.

Tools Used

• Node.js
• Express.js
• Docker
• VS Code
• Git/GitHub
• Terminal

Architecture

Developer writes application code
→ Dockerfile is created
→ Docker image is built
→ Docker container is started
→ Application runs on localhost
→ Logs and health endpoint are used for verification

Folder Structure

devops-docker-basic-app/
│
├── app/
│   ├── package.json
│   ├── server.js
│
├── Dockerfile
├── .dockerignore
└── README.md

How to Run the Project

1. Clone the Repository

git clone <your-repository-url>
cd devops-docker-basic-app

2. Build the Docker Image

docker build -t devops-basic-app:v1 .

3. Run the Docker Container

docker run -d -p 3000:3000 --name devops-basic-container devops-basic-app:v1

4. Test the Application

curl http://localhost:3000

Health check:

curl http://localhost:3000/health

5. Check Container Logs

docker logs devops-basic-container

6. Stop and Remove the Container

docker stop devops-basic-container
docker rm devops-basic-container

What I Learned

• How to create a simple Node.js web application
• How to write a Dockerfile
• How to build a Docker image
• How to run a Docker container
• How port mapping works in Docker
• How to check container logs
• How to add a basic health check endpoint
• How to troubleshoot common Docker issues