How to Deploy a New App Version on AWS ECS Using Docker and ECR

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A DevOps engineer received updated application code from a developer containing bug fixes and a new feature, requiring a fresh deployment to production. The process involved pulling the latest code from GitHub, building a new Docker image tagged as v2, and pushing it to Amazon ECR alongside the existing v1 image. A new ECS Task Definition revision was created pointing to the updated image URI, replacing the old container reference. The ECS service was then updated to trigger a rolling deployment, where the new container starts and passes health checks before the old one is removed, minimizing downtime. Retaining both image versions in ECR ensures a quick rollback option if the new deployment encounters issues.

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