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Question 168 - DOP-C02 discussion

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A DevOps engineer is using AWS CodeDeploy across a fleet of Amazon EC2 instances in an EC2 Auto Scaling group. The associated CodeDeploy deployment group, which is integrated with EC2 Auto Scaling, is configured to perform in-place deployments with codeDeployDefault.oneAtATime During an ongoing new deployment, the engineer discovers that, although the overall deployment finished successfully, two out of five instances have the previous application revision deployed. The other three instances have the newest application revision

What is likely causing this issue?

A.
The two affected instances failed to fetch the new deployment.
Answers
A.
The two affected instances failed to fetch the new deployment.
B.
A failed Afterinstall lifecycle event hook caused the CodeDeploy agent to roll back to the previous version on the affected instances
Answers
B.
A failed Afterinstall lifecycle event hook caused the CodeDeploy agent to roll back to the previous version on the affected instances
C.
The CodeDeploy agent was not installed in two affected instances.
Answers
C.
The CodeDeploy agent was not installed in two affected instances.
D.
EC2 Auto Scaling launched two new instances while the new deployment had not yet finished, causing the previous version to be deployed on the affected instances.
Answers
D.
EC2 Auto Scaling launched two new instances while the new deployment had not yet finished, causing the previous version to be deployed on the affected instances.
Suggested answer: B

Explanation:

When AWS CodeDeploy performs an in-place deployment, it updates the instances with the new application revision one at a time, as specified by the deployment configurationcodeDeployDefault.oneAtATime. If a lifecycle event hook, such asAfterInstall, fails during the deployment, CodeDeploy will attempt to roll back to the previous version on the affected instances. This is likely what happened with the two instances that still have the previous application revision deployed. The failure of theAfterInstalllifecycle event hook triggered the rollback mechanism, resulting in those instances reverting to the previous application revision.

AWS CodeDeploy documentation on redeployment and rollback procedures1.

Stack Overflow discussions on re-deploying older revisions with AWS CodeDeploy2.

AWS CLI reference guide for deploying a revision2.

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asked 16/09/2024
Rafal Piasecki
40 questions
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