Building Resilient CI/CD Pipelines with GitHub Actions and AWS

An engineering team's reliability is measured by the robustness of its deployment flow. An efficient pipeline allows you to iterate with confidence and security.

### 1. Docker Layer Caching 80% of build time is typically wasted downloading heavy dependencies. By setting up Docker layer cache on edge in your GitHub Actions (`type=gha`), recurrent builds execute in seconds instead of minutes.

### 2. Blue/Green Deployments on AWS ECS Guarantee zero downtime in production by gradually redirecting traffic to the new set of containers only when they pass the Application Load Balancer's initial health checks.

### 3. Automated Rollbacks with Metrics Connect your CloudWatch or Datadog alarms to the deployment flow to automatically revert to the previous stable state if an unusual spike in API error rates is detected following a deploy.