Node.js Application in Kubernetes

Overview

This project demonstrates a simple Node.js application built with Express.js, containerized using Docker, and deployed on a Kubernetes cluster. The application runs locally on a Minikube cluster and can be extended to run on cloud-based Kubernetes environments.

Features

• Node.js application built with Express.js.
• Dockerized for consistent deployment.
• Deployed in Kubernetes using Minikube for local testing .
• Scalable to cloud-based Kubernetes clusters.

Project Structure

.
├── app.js                  # Your Node.js application entry point
├── package.json            # Node.js dependencies and scripts
├── Dockerfile              # Docker configuration for the Node.js app
├── deployment.yaml         # Kubernetes Deployment and Service definition
└── README.md               # Project documentation

Prerequisites

To set up and run the project, ensure you have the following:

• Node.js installed (version 20 or later).
• Docker installed and running.
• Kubernetes cluster (local or cloud-based, e.g., Minikube or GKE).
• kubectl CLI tool installed and configured.

Setup and Deployment

1. Clone the Repository

First, clone the project repository:

git clone <repository_url>
cd <project_directory>

2. Install Dependencies

Install the required dependencies by running:

npm install

3. Build the Docker Image

Before deploying to Kubernetes, build and optionally push the Docker image to DockerHub:

docker build -t <your_dockerhub_username>/nodejs-app .

(Optional) Push the image to DockerHub:

docker push <your_dockerhub_username>/nodejs-app

4. Deploy to Kubernetes

Apply the Kubernetes deployment and service configuration using kubectl:

kubectl apply -f deployment.yaml

This will create a Kubernetes deployment with 3 replicas and expose the service via a LoadBalancer on port 80.

5. Access the Application

If you're using Minikube, access the service by running:

minikube service node-k8s-app-service

This will open the application in your browser.

For cloud-based Kubernetes clusters, note the external IP of the LoadBalancer by running:

kubectl get services

Then, navigate to the external IP address in your browser.

6. Cleanup

To clean up the Kubernetes resources, run:

kubectl delete -f deployment.yaml