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Amazon ECR Cross-Region Replication

5 minutes 5 Questions

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 replication helps with disaster recovery scenarios by ensuring that a copy of the container image is available in a separate geographic location, reducing the risk of losing critical application artifacts. Developers can enable cross-region replication for each repository using the AWS Management Console, AWS CLI, or AWS SDKs.

Guide to Amazon ECR Cross-Region Replication

Introduction:
Amazon Elastic Container Registry (ECR) Cross-Region Replication is a critical feature that lets you copy container images across multiple AWS regions. This capability ensures an efficient, secure, and reliable way of managing and deploying Docker container images globally.

Importance:
Cross-Region Replication is vital for reducing download times, ensuring high availability, providing disaster recovery solutions, and adhering to data sovereignty requirements. It helps to maintain a consistent, global application deployment state, and improves response times by providing locality of access.

Concept:
Cross-Region Replication mainly works by automatically replicating every image layer identified by a unique SHA256 hash and consistently creating the exact repository structure in the destination region. It supports private connectivity with Amazon VPC enabling reliable, scalable, and secure image replication.

Exam Tips:
1. Understand the difference between cross-region and cross-account replication.
2. Know the scenarios where cross-region replication would be beneficial.
3. Understand the underlying technology, for example the use of SHA256 hashes for identifying image layers.
4. Familiarize yourself with related AWS services, such as Amazon VPC.

Conclusion:
Navigating the complexities of Cross-Region Replication in Amazon ECR requires a clear understanding of the concept and how it operates. This knowledge will allow you to provide better solutions in a real-world scenario, as well as answer questions effectively in the exam.

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AWS Certified Solutions Architect - Amazon EC2 Container Registry Example Questions

Test your knowledge of Amazon Simple Storage Service (S3)

Question 1

You are setting up Amazon ECR Cross-Region Replication, and you want to ensure that only specific repositories will be replicated. What is the best approach?

Correct Answer: Use a repository filter in the replication rule

The best approach is to use a repository filter in the replication rule. This will ensure that only specific repositories matching the filter criteria will be replicated. IAM policies, KMS key policies, or Lifecycle Configurations don't control the replication process. Creating a Lambda function and manually syncing repositories each time is not efficient and prone to error.

Question 2

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.

Question 3

A company wants to set up Amazon ECR Cross-Region Replication to ensure image repositories are available in two regions. Which of the following steps should the company take to achieve this?

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

To enable Amazon ECR Cross-Region Replication, you need to create an Amazon ECR replication rule and configure it with a destination region. Creating an ECR group, using S3 transfer acceleration, or enabling CloudFront doesn't enable ECR Cross-Region Replication. Using CodePipeline or creating an S3 bucket in the destination region won't achieve the desired outcome as well.

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