Blue-Green Deployment on AWS EKS using Jenkins 🚀 Project Overview

This project demonstrates a CI/CD pipeline using Jenkins to deploy a containerized application on an AWS EKS Kubernetes cluster using a Blue-Green deployment strategy.

It includes:

Dockerized Python application Jenkins pipeline for CI/CD Amazon EKS cluster provisioning Kubernetes Blue-Green deployment Automatic image build and push to Docker Hub Traffic switching using Kubernetes Service 🏗️ Architecture Developer pushes code to GitHub Jenkins pipeline triggers automatically Docker image is built Image is pushed to Docker Hub EKS cluster is created / validated Green deployment is applied Service switches traffic from Blue → Green 📁 Project Structure BlueGreen-Deployment/ │ ├── app/ │ ├── Dockerfile │ ├── app.py │ ├── requirements.txt │ ├── k8s/ │ ├── namespace.yaml │ ├── blue/ │ ├── green/ │ ├── Jenkinsfile └── README.md ⚙️ Prerequisites

Make sure you have:

AWS Account EKS IAM permissions Jenkins installed Docker installed on Jenkins server kubectl installed eksctl installed AWS CLI configured DockerHub account 🔐 Jenkins Credentials Required

Add these in Jenkins → Manage Credentials:

Credential ID Type Purpose dockerhub-creds Username/Password DockerHub login aws-creds AWS credentials EKS access 🐳 Build & Run Locally Build Docker image docker build -t sample-app . Run container docker run -p 8080:8080 sample-app

Test:

curl http://localhost:8080/ curl http://localhost:8080/health ☸️ Kubernetes Deployment Apply namespace kubectl apply -f k8s/namespace.yaml Deploy Blue version kubectl apply -f k8s/blue/ Deploy Green version kubectl apply -f k8s/green/ 🔄 Blue-Green Switching

Traffic switching is done by updating the Kubernetes Service:

Blue active selector: version: blue Switch to Green selector: version: green

Apply:

kubectl apply -f k8s/green/service.yaml 🚀 Jenkins Pipeline Stages Checkout code Build Docker image Push to Docker Hub Create/verify EKS cluster Configure kubectl Deploy Green version Validate deployment Switch traffic (Blue → Green) 📊 Health Checks

The application exposes:

/ → Main endpoint /health → Readiness/Liveness probe 🧠 Key Concepts Used CI/CD with Jenkins Containerization with Docker Kubernetes Deployments Blue-Green Deployment Strategy AWS EKS Managed Kubernetes ⚠️ Common Issues Pods stuck in Pending Node group not scaled properly Insufficient CPU/memory Deployment timeout Missing /health endpoint Missing readinessProbe Node group issues eksctl scale nodegroup ... 🎯 Author

DevOps Learning Project – Jenkins + EKS + Docker + Kubernetes