Updating and deleting stacks in AWS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a CloudFormation stack update?

A stack update is the process of changing the resources or settings in an existing CloudFormation stack to match a new template or parameters.

beginner

What happens if a stack update fails?

If a stack update fails, CloudFormation rolls back the changes to keep the stack in its previous stable state.

beginner

How do you delete a CloudFormation stack?

You delete a stack by telling CloudFormation to remove all the resources it created for that stack, cleaning up everything automatically.

intermediate

What should you check before deleting a stack?

Check if any resources are still in use or have dependencies outside the stack to avoid breaking other systems.

intermediate

Can you update a stack to remove resources?

Yes, by modifying the template to remove resources and then updating the stack, CloudFormation deletes those resources during the update.

What does CloudFormation do if a stack update fails?

A Rolls back to the previous stack state

B Leaves the stack partially updated

C Deletes the stack automatically

D Ignores the failure and continues

CloudFormation rolls back the stack to its previous stable state to avoid partial updates.

Which action deletes all resources created by a CloudFormation stack?

A Pausing the stack

B Updating the stack

C Creating a new stack

D Deleting the stack

Deleting the stack removes all resources created by that stack.

How can you remove a resource from a stack?

A Update the stack with a template that excludes the resource

B Delete the resource manually

C Pause the stack

D Rename the resource

Updating the stack with a new template that removes the resource causes CloudFormation to delete it.

Before deleting a stack, what should you verify?

A That the stack is paused

B That no resources are used elsewhere

C That the stack is updated

D That the stack has no outputs

Ensure no resources are in use outside the stack to prevent breaking dependencies.

What is the main benefit of stack updates?

A Creating new resources only

B Deleting the stack automatically

C Changing existing resources without deleting the stack

D Backing up stack data

Stack updates allow changing resources without deleting the entire stack.

Explain the process and safety mechanisms involved when updating a CloudFormation stack.

Think about how CloudFormation keeps your resources safe during changes.

Describe the steps and considerations before deleting a CloudFormation stack.

Deleting a stack is like cleaning up a project; make sure nothing important is still connected.