Amazon Exam DOP-C02 Topic 2 Question 20 Discussion

Actual exam question for Amazon's DOP-C02 exam

Question #: 20
Topic #: 2

A company runs a web application that extends across multiple Availability Zones. The company uses an Application Load Balancer (ALB) for routing. AWS Fargate (or the application and Amazon Aurora for the application data The company uses AWS CloudFormation templates to deploy the application The company stores all Docker images in an Amazon Elastic Container Registry (Amazon ECR) repository in the same AWS account and AWS Region.

A DevOps engineer needs to establish a disaster recovery (DR) process in another Region. The solution must meet an RPO of 8 hours and an RTO of 2 hours The company sometimes needs more than 2 hours to build the Docker images from the Dockerfile

Which solution will meet the RTO and RPO requirements MOST cost-effectively?

ACopy the CloudFormation templates and the Dockerfile to an Amazon S3 bucket in the DR Region Use AWS Backup to configure automated Aurora cross-Region hourly snapshots In case of DR, build the most recent Docker image and upload the Docker image to an ECR repository in the DR Region Use the CloudFormation template that has the most recent Aurora snapshot and the Docker image from the ECR repository to launch a new CloudFormation stack in the DR Region Update the application DNS records to point to the new ALB

BCopy the CloudFormation templates to an Amazon S3 bucket in the DR Region Configure Aurora automated backup Cross-Region Replication Configure ECR Cross-Region Replication. In case of DR use the CloudFormation template with the most recent Aurora snapshot and the Docker image from the local ECR repository to launch a new CloudFormation stack in the DR Region Update the application DNS records to point to the new ALB

CCopy the CloudFormation templates to an Amazon S3 bucket in the DR Region. Use Amazon EventBridge to schedule an AWS Lambda function to take an hourly snapshot of the Aurora database and of the most recent Docker image in the ECR repository. Copy the snapshot and the Docker image to the DR Region in case of DR, use the CloudFormation template with the most recent Aurora snapshot and the Docker image from the local ECR repository to launch a new CloudFormation stack in the DR Region

DCopy the CloudFormation templates to an Amazon S3 bucket in the DR Region. Deploy a second application CloudFormation stack in the DR Region. Reconfigure Aurora to be a global database Update both CloudFormation stacks when a new application release in the current Region is needed. In case of DR. update, the application DNS records to point to the new ALB.

Show Suggested Answer

Suggested Answer: B

The most cost-effective solution to meet the RTO and RPO requirements is option B. This option involves copying the CloudFormation templates to an Amazon S3 bucket in the DR Region, configuring Aurora automated backup Cross-Region Replication, and configuring ECR Cross-Region Replication. In the event of a disaster, the CloudFormation template with the most recent Aurora snapshot and the Docker image from the local ECR repository can be used to launch a new CloudFormation stack in the DR Region. This approach avoids the need to build Docker images from the Dockerfile, which can sometimes take more than 2 hours, thus meeting the RTO requirement. Additionally, the use of automated backups and replication ensures that the RPO of 8 hours is met.

AWS Documentation on Disaster Recovery:Plan for Disaster Recovery (DR) - Reliability Pillar

AWS Blog on Establishing RPO and RTO Targets:Establishing RPO and RTO Targets for Cloud Applications

AWS Documentation on ECR Cross-Region Replication: Amazon ECR Cross-Region Replication

AWS Documentation on Aurora Cross-Region Replication: Replicating Amazon Aurora DB Clusters Across AWS Regions

by Deeanna at Mar 16, 2024, 03:08 AM

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Frank

7 days ago

I'm not a big fan of option D. Maintaining two separate CloudFormation stacks and reconfiguring Aurora to be a global database seems like overkill for this use case. The RTO and RPO requirements can be met with simpler solutions.

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Marg

8 days ago

Option C is also interesting, using EventBridge and Lambda to automate the hourly snapshots. That could give us a bit more control over the backup process, but it might be a bit more complex to set up and maintain.

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Erasmo

9 days ago

I think option B looks like the most cost-effective solution. Leveraging Aurora cross-Region replication and ECR cross-Region replication seems like a straightforward way to maintain the latest data and Docker images in the DR Region, without the overhead of constantly copying snapshots.

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Yong

10 days ago

Hmm, this question seems to be testing our knowledge of disaster recovery strategies for a multi-AZ web application. The key requirements are a low RPO of 8 hours and an RTO of 2 hours, which means we need a solution that can quickly recover the application and data in case of a disaster.

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