🚀 AWS CI/CD Deployment – Flask App on ECS with CodePipeline

This project demonstrates how to build and deploy a Dockerized Flask web application to Amazon ECS (Fargate) using a fully automated CI/CD pipeline built with AWS CodePipeline, CodeBuild, and CodeDeploy.

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🔧 Tech Stack

• Language: Python 3.11 (Flask 3.0)
• Containerization: Docker
• Infrastructure:
  • Amazon ECS (Fargate)
  • Amazon ECR (Elastic Container Registry)
  • AWS CodePipeline (CI/CD Orchestration)
  • AWS CodeBuild (Image Build & Push)
  • AWS CodeDeploy (Blue/Green ECS Deployment)
  • Amazon S3 (Artifacts)
  • GitHub / CodeCommit (Source Repo)

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📁 Project Structure

myapp/

├── app.py
├── Dockerfile
├── requirements.txt
├── buildspec.yml
     └── imagedefinitions.json 

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🚦 CI/CD Pipeline Flow

1. Code Commit:
   • Code is pushed to GitHub or AWS CodeCommit.
2. CodePipeline Trigger:
   • Pipeline is automatically triggered.
3. CodeBuild Phase:
   • Builds Docker image from Dockerfile.
   • Tags and pushes image to ECR.
   • Generates imagedefinitions.json file.
4. CodeDeploy Phase:
   • ECS Service is updated with new image (zero-downtime Blue/Green).
5. ✅ Deployed Flask App is now live on ECS Fargate!

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📦 Requirements

• AWS CLI Configured
• IAM Roles:
  • CodePipelineRole
  • CodeBuildRole
  • ECS TaskExecutionRole
• Amazon ECS Cluster & Service created with:
  • Launch type: Fargate
  • Container name: myapp-container
• Amazon ECR Repo created (myapp)
• S3 Bucket for artifacts (optional but recommended)

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🔍 Key Files

app.py

A simple web app using Flask 3.0:

@app.route("/")
def index():
    return "✅ Deployed Flask 3.0 App via AWS ECS + CodePipeline 🚀"




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## 🧪 Testing the App
After successful deployment, access your application via:

Application Load Balancer (ALB) DNS name

OR ECS Task public IP (if configured)

✅ Deployed Flask 3.0 App via AWS ECS + CodePipeline 🚀


## 📈 Optional Enhancements
Add unit tests to CodeBuild phase

Add CloudWatch Logs for ECS service

Configure Blue/Green Deployment with health checks

Setup GitHub Actions instead of CodeBuild for CI

Add Slack or Email Notification using SNS


## 📄 License
MIT License – free to use and modify.


## 👨‍💻 Author
Harsh Sonkar
AWS | Python | DevOps | Full Stack | Data Engineer