Exam AWS DevOps Engineer Professional All Questions

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Exam AWS DevOps Engineer Professional topic 1 question 17 discussion

Exam question from Amazon's AWS DevOps Engineer Professional

Question #: 17
Topic #: 1

[All AWS DevOps Engineer Professional Questions]

A company is using AWS CodePipeline to automate its release pipeline. AWS CodeDeploy is being used in the pipeline to deploy an application to Amazon ECS using the blue/green deployment model. The company wants to implement scripts to test the green version of the application before shifting traffic. These scripts will complete in 5 minutes or less. If errors are discovered during these tests, the application must be rolled back.
Which strategy will meet these requirements?

A. Add a stage to the CodePipeline pipeline between the source and deploy stages. Use AWS CodeBuild to create an execution environment and build commands in the buildspec file to invoke test scripts. If errors are found, use the aws deploy stop-deployment command to stop the deployment.
B. Add a stage to the CodePipeline pipeline between the source and deploy stages. Use this stage to execute an AWS Lambda function that will run the test scripts. If errors are found, use the aws deploy stop-deployment command to stop the deployment.
C. Add a hooks section to the CodeDeploy AppSpec file. Use the AfterAllowTestTraffic lifecycle event to invoke an AWS Lambda function to run the test scripts. If errors are found, exit the Lambda function with an error to trigger rollback.
D. Add a hooks section to the CodeDeploy AppSpec file. Use the AfterAllowTraffic lifecycle event to invoke the test scripts. If errors are found, use the aws deploy stop-deployment CLI command to stop the deployment.

Show Suggested Answer

Suggested Answer: C 🗳️

by WhyIronMan at March 22, 2021, 4:50 p.m.

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Comments

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WhyIronMan

Highly Voted 3 years, 9 months ago

C looks correct, reference: https://docs.aws.amazon.com/codedeploy/latest/userguide/reference-appspec-file-structure-hooks.html#reference-appspec-file-structure-hooks-section-structure-ecs-sample-function

upvoted 23 times

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scottytoohotty

Most Recent 2 years, 3 months ago

Selected Answer: C

C is the one

upvoted 1 times

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Piccaso

2 years, 4 months ago

Selected Answer: A

C and D were excluded because AfterAllowTraffic should be BeforeAllowTraffic. B is excluded because Lambda function is not needed. CodeBuild has managed test environment.

upvoted 1 times

Piccaso

2 years, 4 months ago

Sorry, I was wrong. A does not involve rollback action. In C, AfterAllowTestTraffic is the hook we need. And C is the only option involves rollback action.

upvoted 3 times

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Bulti

2 years, 6 months ago

C is the correct answer.

upvoted 1 times

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ceros399

2 years, 6 months ago

Selected Answer: C

C is correct, you need to run the script, the best option is using lambda

upvoted 1 times

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developer_404

2 years, 7 months ago

Selected Answer: C

Other answers are just stopping the deployment. Rollback is one of the requirement fulfilled by this answer C

upvoted 4 times

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ebratz

2 years, 9 months ago

Selected Answer: C

https://docs.aws.amazon.com/codedeploy/latest/userguide/reference-appspec-file-structure-hooks.html AfterAllowTestTraffic – Use to run tasks after the test listener serves traffic to the replacement task set. The results of a hook function at this point can trigger a rollback.

upvoted 2 times

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colinquek

2 years, 9 months ago

Selected Answer: C

C A, B - u need to deploy first else there is nth to test. And rem CodeBuild is exactly tt, do code building. D - AfterAllowTraffic means the Green env is alr "live", if there is no "AfterAllowTestTraffic" option (C), then D is the correct one. Since there AfterAllowTestTraffic, its better to chose tt. https://docs.aws.amazon.com/codedeploy/latest/userguide/reference-appspec-file-structure-hooks.html << take a look at the diagram in this.

upvoted 3 times

apcloud

2 years, 7 months ago

do you really need to abbreviate? it makes it way harder to read your explanation. please stop.

upvoted 5 times

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MikeyJ

2 years, 9 months ago

Selected Answer: C

AfterAllowTestTraffic – Use to run tasks after the test listener serves traffic to the replacement task set. The results of a hook function at this point can trigger a rollback. https://docs.aws.amazon.com/codedeploy/latest/userguide/reference-appspec-file-structure-hooks.html

upvoted 1 times

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colinquek

2 years, 9 months ago

Selected Answer: B

B - is testing the new deployment, the green env.

upvoted 1 times

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shiptyeyes

2 years, 9 months ago

Q - "implement scripts to test the green version of the application before shifting traffic" Ans C - "Use the AfterAllowTestTraffic lifecycle event to invoke an AWS Lambda function" Why is everyone picking the answer that tests the code "AfterAllowTestTraffic"?

upvoted 2 times

aws_arn_name

2 years, 9 months ago

Becaus it is "Test" traffic , not real traffic

upvoted 2 times

satz_17

2 years, 8 months ago

yeah, It's ECS deployment and the question says "test the green version of the application before shifting traffic". In codedeploy ECS deployment has a hook "AfterallowTestTraffic" where we can invoke lambda. So the correct answer is C.

upvoted 1 times

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arpana_03

3 years, 8 months ago

C is correct answer

upvoted 2 times

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