Hands-On AWS CI/CD: CodeBuild, CodeDeploy, CodePipeline & Zero-Downtime Blue/Green Releases

Introduction

If you've ever wondered how production teams ship code dozens of times a day without breaking things (or how they recover fast when they do), the answer almost always comes down to a solid CI/CD pipeline. In this post, I'm going to walk you through exactly how I built one end-to-end on AWS — from pushing code to a Git repository all the way through automated build, test, deploy, rollback, and finally a blue/green deployment strategy.

Here's what the full pipeline looks like at a high level:

Git Push → S3 (source) → AWS CodeBuild (build + test) → AWS CodeDeploy → EC2 (production)

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