Day 5: AWS ECR: Creating and Managing Container Registries

Continuing from Day 4, today we explore Amazon Elastic Container Registry (ECR), AWS's managed Docker registry. We'll create a repo and manage it.

Why ECR?

ECR stores Docker images securely, integrates with ECS, and handles authentication automatically.

Step 1: Create an ECR Repository

Via Console:

1. Search for ECR in AWS Console.
2. Click "Create repository."
3. Choose private/public, name it (e.g., my-app-repo).
4. Create.

Via CLI:

aws ecr create-repository --repository-name my-app-repo --region us-west-2 

Step 2: Managing Repositories

• Public vs. Private: Private for internal use; public for sharing.
• Lifecycle Policies: To clean old images, add policy via console (e.g., expire untagged images after 30 days).

{ "rules": [ { "rulePriority": 1, "description": "Expire untagged images", "selection": { "tagStatus": "untagged", "countType": "sinceImagePushed", "countUnit": "days", "countNumber": 30 }, "action": { "type": "expire" } } ] } 

Verify: aws ecr describe-repositories

Today’s Takeaway

ECR is set up! Tomorrow, push images to it.

What’s Next?
In Day 6, we’ll integrate Docker with ECR.