Modern CI/CD on AWS EKS: A DevOps Engineer’s Guide to Blue-Green Deployments

1. 📄 Introduction

In the world of modern software engineering, speed, security, and reliability are no longer luxuries—they are expectations. DevOps practices and Continuous Integration/Continuous Deployment (CI/CD) pipelines have become essential for teams aiming to release code quickly, safely, and consistently.

This series walks you through a real-world, production-grade CI/CD pipeline implementation on Amazon Web Services (AWS) using industry-standard tools. From infrastructure provisioning to automated deployments with zero downtime, we’ll explore the complete workflow DevOps engineers use in the field today.

2. 📊 What You'll Build

In this hands-on project, we will build and deploy a Spring Boot microservice application using a fully automated CI/CD pipeline. Here's what the pipeline includes:

• Infrastructure provisioning with Terraform

• Continuous Integration and Deployment using Jenkins

• Static code analysis with SonarQube

• Vulnerability scanning using Trivy

• Dockerized build and deployment

• Kubernetes deployment on Amazon EKS

• Zero-downtime rollout using Blue-Green Deployment strategy

By the end of the series, you will have a production-ready pipeline that ensures secure, stable, and seamless deployments.

3. 🚧 Tools and Technologies Used

Here is a snapshot of the tools powering our pipeline:

• Spring Boot — Building the microservice

• Docker — Containerizing the application

• Jenkins — Automating the CI/CD process

• Terraform — Defining and provisioning AWS infrastructure as code

• SonarQube — Enforcing code quality through static analysis

• Trivy — Scanning for container vulnerabilities

• Amazon EKS (Elastic Kubernetes Service) — Managed Kubernetes environment

• Blue-Green Deployment — Ensuring zero-downtime release strategy

4. ❓ Why This Stack?

This stack isn’t just trendy—it’s practical.

• Scalability: Kubernetes and EKS make scaling applications effortless.

• Security: Integrated vulnerability scans and code checks enhance security posture.

• Automation: Terraform and Jenkins handle everything from provisioning to deployment.

• Cost-efficiency: Open-source tools reduce licensing overhead.

• Industry-Ready: These are the tools used by top companies in production.

5. 🌐 Architecture Diagram

Here's how the pieces fit together:

Developer
   ↓
Jenkins
   ↓
Terraform → AWS Infrastructure (EKS, VPC, EC2, IAM, etc.)
   ↓
Code Scan (SonarQube + Trivy)
   ↓
Docker Build
   ↓
Push to Registry (DockerHub)
   ↓
Deploy to EKS (via kubectl)
   ↓
Blue-Green Deployment Strategy
   ↓
End User (Access via Load Balancer)

This setup ensures automation, quality checks, secure packaging, and seamless deployment for modern applications.

6. 📆 Series Roadmap

Here's a sneak peek at the journey ahead:

• 🧱 Part 1: Setting Up Terraform and AWS Infrastructure

• 💣 Part 2: Dockerizing the Spring Boot App

• ⚙️ Part 3: Installing Jenkins, SonarQube & Trivy

• ↻ Part 4: Building a Jenkins Pipeline

• ☘️ Part 5: Deploying to EKS with Blue-Green Strategy

• 🧪 Part 6: Testing, Debugging, and Going Live

7. 🙋 Conclusion

With this series, you'll not only learn how to set up a secure and scalable CI/CD pipeline but also understand how to align with real-world DevOps practices.

Stay tuned for Part 1: Setting Up Terraform and AWS Infrastructure, where we set the foundation for everything that follows.

Follow the series, share your thoughts, and collaborate to build DevOps excellence together!