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Amazon ECR Cross-Region Replication

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Amazon ECR supports cross-region replication, which allows developers to automatically replicate container images across multiple AWS Regions. This feature aids in achieving faster application updates and improved availability, as images are stored closer to the running instances. Cross-region repl…

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AWS Certified Solutions Architect - Amazon ECR Cross-Region Replication Example Questions

Test your knowledge of Amazon ECR Cross-Region Replication

Question 1

A company needs its Amazon ECR repositories to automatically replicate images from one AWS Region to another for disaster recovery. What configuration step must they perform in ECR to enable cross-region replication?

Correct Answer: Create an ECR replication rule and configure it with a destination region

Amazon ECR cross-region replication is configured at the registry level by creating a replication configuration that contains one or more replication rules. Each rule specifies the destination region (and optionally destination registry and repository filters). Creating an ECR replication rule with the desired destination region enables automatic replication of pushed images. There is no concept of an ECR "replication group," S3 Transfer Acceleration is unrelated to ECR replication, and CloudFront is not used to replicate ECR images.

Question 2

You are configuring Amazon ECR cross-Region replication and must ensure that only a subset of repositories (for example, those whose names start with "prod-") are replicated to the destination registry. Which configuration should you use to achieve this?

Correct Answer: Use a repository filter in the replication rule

Amazon ECR cross-Region replication is configured with replication rules at the registry level. To replicate only certain repositories, you specify repository filters in the replication rule, typically using a name prefix filter. This restricts replication to repositories that match the filter. IAM policies on the destination registry do not selectively allow or block which repositories get replicated; they control access, not replication selection. KMS key policies govern encryption and key usage, not which repositories are replicated. Lifecycle policies manage image retention within a repository and do not affect replication scope.

Question 3

A company is using Amazon ECR Cross-Region Replication to replicate image repositories. They want to monitor and get notified about replication failures. What should they do?

Correct Answer: Create Amazon CloudWatch Alarms for ECR replication failure metrics

The best option to monitor and get notified about replication failures is by creating Amazon CloudWatch Alarms for ECR replication failure metrics. Amazon SNS, Trusted Advisor, or notifications on destination ECR repository won't help for monitoring replication failures. A custom script or using CloudTrail/Lambda is not necessary, as CloudWatch Metrics and Alarms are available for monitoring.

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