🔹 1. Push Code to GitHub

• 💻 You write/update your application code.

• ⬆️ Commit & push to your GitHub repository.

• 🛎️ This triggers a GitHub Action workflow.

🔹 2. GitHub Actions Workflow Starts

• ⚙️ GitHub reads your .github/workflows/deploy.yml file.

• 🎯 Jobs & steps are executed (like testing, building, packaging).

• 🔑 GitHub uses AWS credentials (Access Key, Secret Key, Role, OIDC) to authenticate with AWS.

🔹 3. Build & Test

• 🧪 Unit Tests, Integration Tests, Linting.

• 📦 Build code → Create artifact (e.g., ZIP, JAR, Docker Image).

• ✅ Ensures only working code moves forward.

🔹 4. Push Artifact / Image to AWS

Depending on your setup:

• 📦 AWS S3 → Upload build artifacts (Lambda, static websites).

• 🐳 ECR (Elastic Container Registry) → Push Docker images.

🔹 5. Deployment to AWS Service

• 🚀 GitHub Action triggers deployment commands using AWS CLI / CDK / SAM / Terraform.

• Common services:

  • AWS Lambda → for serverless apps.

  • Amazon ECS / EKS → for containerized apps.

  • Elastic Beanstalk → for web apps.

  • S3 + CloudFront → for static websites.

🔹 6. Infrastructure Update

• ⚡ CloudFormation/CDK stack updates resources.

• 🎛️ Load balancer, scaling groups, environment variables updated automatically.

🔹 7. Verify & Monitor

• 🧐 GitHub Action checks deployment success.

• 🔍 Logs can be viewed in AWS CloudWatch.

• 📊 Health checks via ALB / ECS / Lambda console.

🔹 8. Notifications

• 📩 GitHub can notify via Slack, Email, or GitHub Status.

• 🎉 Success = Green ✅ | ❌ Failures trigger alerts.

🎨 Colorful Flow Diagram (Text-based)

👨‍💻 Developer → 🔄 Push Code → 
⚙️ GitHub Actions (CI/CD) →
🧪 Test & Build → 📦 Package →
⬆️ Upload to AWS (S3/ECR) →
🚀 Deploy (Lambda/ECS/Beanstalk/S3) →
📊 Monitor with CloudWatch →
🎉 Success Notification

✨ In short:
GitHub Actions = CI/CD brain 🧠
AWS = Deployment home 🏡