Exam Professional Cloud DevOps Engineer topic 1 question 115 discussion

Actual exam question from Google's Professional Cloud DevOps Engineer

Question #: 115
Topic #: 1

[All Professional Cloud DevOps Engineer Questions]

You use Terraform to manage an application deployed to a Google Cloud environment. The application runs on instances deployed by a managed instance group. The Terraform code is deployed by using a CI/CD pipeline. When you change the machine type on the instance template used by the managed instance group, the pipeline fails at the terraform apply stage with the following error message:

You need to update the instance template and minimize disruption to the application and the number of pipeline runs.

What should you do?

A. Delete the managed instance group, and recreate it after updating the instance template.
B. Add a new instance template, update the managed instance group to use the new instance template, and delete the old instance template.
C. Remove the managed instance group from the Terraform state file, update the instance template, and reimport the managed instance group.
D. Set the create_before_destroy meta-argument to true in the lifecycle block on the instance template.

Show Suggested Answer

Suggested Answer: D 🗳️

by ManishKS at Oct. 4, 2023, 7:16 a.m.

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alpha_canary

10 months ago

Selected Answer: D

https://developer.hashicorp.com/terraform/language/meta-arguments/lifecycle#create_before_destroy https://cloud.google.com/build/docs/deploying-builds/deploy-compute-engine#:~:text=Note%20that%20this,version%20is%20destroyed

upvoted 2 times

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xhilmi

1 year ago

Selected Answer: D

To update the instance template and minimize disruption to the application while resolving the error during the Terraform apply stage, the recommended approach is to use (Option D). By setting the create_before_destroy meta-argument to true in the lifecycle block on the instance template, Terraform will create a new instance template before destroying the old one. This ensures a smooth transition by allowing the managed instance group to gradually replace instances with the new template without causing downtime. This method optimizes the update process, reducing disruption to the application and minimizing the number of pipeline runs needed.

upvoted 1 times

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Jason_Cloud_at

1 year, 1 month ago

Selected Answer: D

D is the best option

upvoted 3 times

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nhiguchi

1 year, 1 month ago

Selected Answer: D

Answer should be D

upvoted 2 times

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ReachTango73

1 year, 2 months ago

D. Check to docs

upvoted 2 times

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ManishKS

1 year, 2 months ago

B is correct Answer

upvoted 1 times

florian_cartron

1 year, 2 months ago

Answer B suggests a manual change, but we should use terraform in a CI/CD pipeline. Answer D is the good one, it does the same thing than B, but with terraform automatically, as the default behaviour of terraform is to destroy resources before recreating it when it cannot be updated we have to tune the lifecycle parameter.

upvoted 4 times

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