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CloudFormation Stack Rollback Behavior
When you create a stack in AWS CloudFormation and one resource fails to create, the entire stack creation is rolled back by default. That means:
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All previously created resources will be automatically deleted.
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The final result is: no resources remain, and the stack status becomes
ROLLBACK_COMPLETE. -
Check the status of a stack:
aws cloudformation describe-stacks --stack-name stack-id