Cloud Formation

Question 1

In Cloud formation what describes the infrastructure in JSON or YAML?

Answer 1

Template

Question 2

What is a Stack in CloudFormation?

Answer 2

Entire environment created by the template

Question 3

What is a StackSet in CloudFormation?

Answer 3

Deploy stacks across accounts/regions

Question 4

What is the benefit of a Change Set?

Answer 4

See changes before committing

Question 5

What do logical ID’s point to in CloudFormation?

Answer 5

Resources within the template

Question 6

What do Physical ID’s point to in CloudFormation?

Answer 6

Resources outside of CloudFormation

Question 7

Which account is the Administrator Account in CloudFormation?

Answer 7

In the account you create the Cloud stack

Question 8

What is the target account in CloudFormation?

Answer 8

The account resources are created

Question 9

How do nested Stacks help?

Answer 9

Prevent copying stacks between accounts. They reference other stacks for reuse.

Question 10

When will you use the Direct update stack method?

Answer 10

Immediate change

Question 11

When will you use the Change Set method?

Answer 11

Preview change before execution

Question 12

What does Drift detection do?

Answer 12

Informs if your infra has changed from the template

Question 13

What is the Helper Script (cfn-init) used for?

Answer 13

Installing packages, parse meta data, start/stop services

Question 14

Where do Helper Scripts logs get saved to?

Answer 14

/var/log/cfn-init.log

Question 15

What is cfn-signal used for?

Answer 15

Signal CloudFormation when a script has finished running

Question 16

What to do if you have problems with Help scripts?

Answer 16

Ensure helper script in AMI and check log files

Question 17

When do you use the CloudFormation - CreationPolicy?

Answer 17

Use it to wait on a resource before stack creation proceeds

Question 18

Which CloudFormation resources support creation policies?

Answer 18

AutoScaling, EC2, CloudFormation

Question 19

What is the CloudFormation deletion policy used for?

Answer 19

Decide what happens to resources before they are deleted, e.g. backup

Question 20

What deletion policy do you use if you want to keep a resource

Answer 20

Retain policy

Question 21

What deletion policy do you use if you want to keep a snapshot of the resource?

Answer 21

Snapshot policy

Question 22

What does deletion policy do by default?

Answer 22

removes/deletes resources

Question 23

What does DependOn do in CloudFormation?

Answer 23

Waits for another resource to be built before creating the next resource

Question 24

What does the WaitOn condition do in CloudFormation?

Answer 24

Use while waiting for external resource to be created

Question 25

Why use the UpdatePolicy?

Answer 25

Decide what happens to your resource during an update

Question 26

Why use the UpdateReplacePolicy?

Answer 26

Retain or backup a resource (EC2) before it is replace during an update

Question 27

What happens when a Stack creation fails?

Answer 27

Everything gets deleted

Question 28

Which OnFailure attribute do you use to keep resources during a stack failure?

Answer 28

DO_NOTHING

Question 29

Which OnFailure attribute do you use to rollback resources during a stack failure?

Answer 29

ROLLBACK

Question 30

Which OnFailure attribute do you use to delete resources during a stack failure?

Answer 30

DELETE

Question 31

What state will CloudFormation be in if it can’t roll back changes during an update?

Answer 31

UPDATE_ROLLBACK_FAILED

Question 32

If a roll back succeeds after an update stack had failed, what stat will it be in?

Answer 32

UPDATE_ROLLBACK_COMPLETE