Exam AWS DevOps Engineer Professional topic 1 question 27 discussion

ans: D

The answer is D. EventBridge is needed to detect the database failure. Lambda is needed to promote the replica as it's in another Region (manual promotion, otherwise). Storing and updating the endpoint in Parameter store is important in updating the application. Look at High Availability section of Aurora FAQ: https://aws.amazon.com/rds/aurora/faqs/

Option D is the correct solution because it uses AWS Systems Manager Parameter Store to store the Aurora endpoint and Amazon EventBridge (Amazon CloudWatch Events) to detect database failures. It runs an AWS Lambda function to promote the read replica and update the endpoint URL stored in Parameter Store, which can be reloaded by the application if a database connection fails.

Correct Answer is D by method of elimination and either way, parameter store can be used to store configuration. Cloudtrail is not applicable to this question

https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/Aurora.Overview.Endpoints.html#Aurora.Endpoint.Tutorial

A looks most automatical.

D is the right answer. We need CloudWatch events to detect errors from the Aurora CloudWatch logs and then invoke a Lambda function to promote the Read Replica in another region. The Lambda can run in the primary region and update the Parameter store in the Primary region with the newly promoted cluster address.

This one is hard to understand, but my bust understanding is: A and b are wrong because they use cloud trail, you would want event bridge or cloud watch events or something else. C is wrong because it’s using lambda to update cloud formation template when you really need to be adjusting the infra in real time not waiting on cloud formation. Knowing that D is the only possible choice that makes sense

I think choice D not right REF : https://aws.amazon.com/blogs/architecture/implementing-multi-region-disaster-recovery-using-event-driven-architecture/ -> Parameter Store is hosted in multiple Availability Zones in an AWS Region -> I go with choice A from this link below. https://aws.amazon.com/blogs/database/cross-region-disaster-recovery-using-amazon-aurora-global-database-for-amazon-aurora-postgresql/

I'll go with D

So why B is wrong?

A: Route 53 is the only one which does not go down in case of region going down. D is incorrect because Parameter Store goes down together with region.

For each of these databases, we store all configuration information in AWS Systems Manager Parameter Store, so the failover process can get all the information it needs to carry out the failover steps. We have created a lambda which breaks down the entire failover process into two steps. Step 1 promotes the replica database to be read write, and Step 2 re-establishes resiliency by creating a new replica in the original primary region. https://developer.gs.com/blog/posts/building-multi-region-resiliency-with-amazon-rds-and-amazon-aurora

D - always choose decoupling options for endpoints, urls, passwords etc.

D looks right

Correct Answer: D Applicatino can be coded to load endpoint value from AWS Parameter Store. Once the value is changed in the param store, the application can use the new value. Just need a reload. Wrong answer is B, because Cloudtrail is for static content and media stream caching. But not for DB content.

answer is D