Exam AWS DevOps Engineer Professional topic 1 question 69 discussion

A is incorrect because "The Start, Install, TestTraffic, AllowTraffic, and End events in the deployment cannot be scripted, which is why they appear in gray in this diagram." https://docs.aws.amazon.com/codedeploy/latest/userguide/reference-appspec-file-structure-hooks.html B.D is incorrect because if the permission or CodeDeploy agent is not installed, the deploy will not go to AllowTraffic hook, it will be fail prior to AllowTraffic.

I'll go with C

Health check should be the culprit.

Correct answer is C

This failure is typically due to incorrectly configured health checks in Elastic Load Balancing for the Classic Load Balancer, Application Load Balancer, or Network Load Balancer used to manage traffic for the deployment group. To resolve the issue, review and correct any errors in the health check configuration for the load balancer. https://docs.aws.amazon.com/codedeploy/latest/userguide/troubleshooting-deployments.html#troubleshooting-deployments-allowtraffic-no-logs

correct is C --- https://docs.aws.amazon.com/codedeploy/latest/userguide/troubleshooting-deployments.html

After reading through the explanations and links here, I agree with all. C is the best choice, thanks everyone for the tips!

A - AllowTraffic is not a user managed hook B - permissions managed by CodeDeploy role, not user. And if we on the AllowTraffic step, then we were able to block LB traffic C - right D - if there was no agent the job would fail on earlier steps

C In some cases, a blue/green deployment fails during the AllowTraffic lifecycle event, but the deployment logs do not indicate the cause for the failure. This failure is typically due to incorrectly configured health checks in Elastic Load Balancing for the Classic Load Balancer, Application Load Balancer, or Network Load Balancer used to manage traffic for the deployment group. To resolve the issue, review and correct any errors in the health check configuration for the load balancer. For Classic Load Balancers, see Configure Health Checks in the User Guide for Classic Load Balancers and ConfigureHealthCheck in the Elastic Load Balancing API Reference version 2012-06-01. For Application Load Balancers, see Health Checks for Your Target Groups in the User Guide for Application Load Balancers. For Network Load Balancers, see Health Checks for Your Target Groups in the Network Load Balancer User Guide.

Ans: C https://docs.aws.amazon.com/pt_br/elasticloadbalancing/latest/application/target-group-health-checks.html