Infrastructure as Code with CloudFormation and CDK Flashcards

What is the purpose of CloudFormation StackSets?

Answer: To deploy CloudFormation stacks across multiple accounts and regions simultaneously

CloudFormation StackSets extend CloudFormation to deploy stacks across multiple AWS accounts and regions in a single operation.

Which CloudFormation template section is used to define conditions that control whether resources are created?

Answer: Conditions

The Conditions section defines logical conditions that can control whether specific resources are created or properties are assigned.

In AWS CDK, what must be done before deploying CDK apps to a new account or region for the first time?

Answer: Run cdk bootstrap

Running cdk bootstrap provisions the necessary CDK toolkit resources (like an S3 bucket) in the target account and region before first deployment.

A CloudFormation stack update fails midway. What happens to the stack by default?

Answer: CloudFormation automatically rolls back to the previous stable state

By default, CloudFormation rolls back all changes to the previous stable state when a stack update fails.

Which CloudFormation function substitutes variables in a string with values from parameters, resources, or pseudo-parameters?

Answer: Fn::Sub

Fn::Sub substitutes variables in an input string, replacing ${VariableName} placeholders with parameter values, resource attributes, or pseudo-parameters.

What is a CloudFormation Change Set used for?

Answer: Previewing how proposed changes will affect running resources before executing them

A Change Set shows you a preview of how CloudFormation will modify your stack resources before you execute the changes.