Exam AWS DevOps Engineer Professional topic 1 question 111 discussion

A - disaster C - wrong - already reached AllowTraffic lifecycle event that means it is not taking time in ValidateService event, problem is in health check itself. B/E - correct Between D/E, why E? AllowTraffic - u cannot run scripts, it belongs to codedeploy BeforeAllowTraffic – You can use this deployment lifecycle event to run tasks on instances before they are registered with a load balancer. AllowTraffic – During this deployment lifecycle event, internet traffic is allowed to access instances after a deployment. This event is reserved for the CodeDeploy agent and cannot be used to run scripts.

CE seems to be correct

ChatGPT said CE C. Reduce the HealthCheckIntervalSeconds and UnhealthyThresholdCount values within the target group health checks to decrease the amount of time it takes for the application to be considered unhealthy. This will make the target group health checks more sensitive to application health changes, which will result in quicker detection of application issues.

I was confused between B and C but after reading more about BeforeAllowTraffic hook, its clear now. For ec2 which is relevant for our question --> You can use this deployment lifecycle event to run tasks on instances before they are registered with a load balancer. This means script mentioned in option E is run on each ec2. Hence option B is suitable one where we need to fail deployment as soon as check fails on any 1 ec2. If we had ECS then option C would have applied because BeforeAllowTraffic - Used to run tasks after the second target group is associated with the replacement task set, but before traffic is shifted to the replacement task set. The results of a hook function at this lifecycle event can trigger a rollback. refer https://docs.aws.amazon.com/codedeploy/latest/userguide/reference-appspec-file-structure-hooks.html#reference-appspec-file-structure-hooks-list

Piccaso makes me confused...really

A is not good for an error has been located in a specific step. C, reduce time interval and threshold count can have biased error E, BeforeAllowTraffic does not match the scenario.

B and E is correct. B because of the use of CodeDeploy trigger- You can create a trigger that publishes an Amazon Simple Notification Service (Amazon SNS) topic for a AWS CodeDeploy deployment or instance event. Then, when that event occurs, all subscribers to the associated topic receive notifications through the endpoint specified in the topic, such as an SMS message or email message. Amazon SNS offers multiple methods for subscribing to topics. E over D because you need to execute a script before you allow traffic and moreover we cannot intercept and write any custom script in the AfterAllowTraffic event since its reserved for CodeDeploy.

https://www.examtopics.com/discussions/amazon/view/53194-exam-aws-devops-engineer-professional-topic-1-question-534/

BE !!!!!

To quickly deliver failure notices while maintaining application availability, the team should: Use the appspec.yml file to run a script on the BeforeAllowTraffic hook to perform health checks on the application and fail the deployment if the health checks performed by the script are not successful. (E) Reduce the HealthCheckIntervalSeconds and UnhealthyThresholdCount values within the target group health checks to decrease the amount of time it takes for the application to be considered unhealthy. (C) By performing health checks on the BeforeAllowTraffic hook, the team can quickly determine if the deployment is successful or not, and fail the deployment if the health checks performed by the script are not successful. This will allow the team to receive failure notices more quickly while maintaining application availability.

BE for sure