Which solution will resolve this issue?

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In: DOP-C02
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A company uses AWS CloudFormation stacks to deploy updates to its application.The stacks consist of different resources.The resources include AWS Auto Scaling groups, Amazon EC2 instances, Application Load Balancers (ALBs), and other resources that are necessary to launch and maintain independent stacks.Changes to application resources outside of CloudFormation stack updates are not allowed.The company recently attempted to update the application stack by using the AWS CLI.The stack failed to update and produced the following error message: “ERROR: both the deployment and the CloudFormation stack rollback failed.The deployment failed because the following resource(s) failed to update: [AutoScalingGroup].”The stack remains in a status of UPDATE_ROLLBACK_FAILED.

Which solution will resolve this issue?

Update the subnet mappings that are configured for the ALBs. Run the aws cloudformation update-stack-set AWS CLI command.

Update the IAM role by providing the necessary permissions to update the stack. Run the aws cloudformation continue-update-rollback AWS CLI command.

Submit a request for a quota increase for the number of EC2 instances for the account. Run the aws cloudformation cancel-update-stack AWS CLI command.

Delete the Auto Scaling group resource. Run the aws cloudformation rollback-stack AWS CLI command.

Explanations:

Updating subnet mappings for the ALBs and running theaws cloudformation update-stack-setcommand is unrelated to resolving the issue with the Auto Scaling group. The error specifically relates to the failure of the AutoScalingGroup resource, not subnet mappings or stack set updates.

Theaws cloudformation continue-update-rollbackcommand is used to continue an update rollback when a stack update fails. Since the stack is in theUPDATE_ROLLBACK_FAILEDstate, this command helps resume and complete the rollback process, which can resolve the failure caused by the Auto Scaling group resource update.

Requesting a quota increase for EC2 instances is not relevant to resolving a failed stack update or rollback. The error is related to a failure in the stack update process, not a resource limit issue. Theaws cloudformation cancel-update-stackcommand is also incorrect here as it would only cancel the update, not resolve the rollback issue.

Deleting the Auto Scaling group resource and running theaws cloudformation rollback-stackcommand is not the correct approach. The rollback operation is supposed to restore the stack to its previous state, but manually deleting resources can cause more issues and doesn’t address the root cause of the failure.

2025-10-15

1 Comment

  1. Lawrence
    Author

    It appears that the answer is:
    Update the IAM role by providing the necessary permissions to update the stack. Run the aws cloudformation continue-update-rollback AWS CLI command.

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