Cloudformation

Question 1

Cloudformation Templates

Answer 1

• can’t edit previous template, have to re upload a new version
• stacks identified by name

Question 2

Cloudformation components

Answer 2

• components
  
  • resources
  • parameters - dynamic inputs for your templates
    
    • reuse templates across accounts, etc.
    • good for keypairs, etc.
    • wont have to re upload template to change it
    • reference parameters with !Ref <par></par>
    • aws pseudo parameters - builtin env variables like arn, region, etc.
  • mappings - static vars
    
    • good for hardcoded vars specific to an env
  • outputs - references to what has been created
    
    • optional
    • if exported then you can import them into other stacks
    • can view outputs in aws console or aws cli
    • good for vpc IDs and your subnet IDs
    • you can’t delete a stack if its outputs are referenced by another stack
    • !ImportValue <val></val>
  • conditionals - list of conditions to perform resource creation
  • metadata

Question 3

Templates get uploaded to..?

Answer 3

S3

Question 4

Cloudformation resources are created in the order you specify?

Answer 4

False

Question 5

You’re trying to delete a CloudFormation stack, but you can’t because other CloudFormation stacks reference its exported outputs. What should you do

Answer 5

First, you need to delete the other CloudFormation stacks that reference the exported outputs, then delete it

Question 6

Exported output names must be unique within your..?

Answer 6

Region

Question 7

lambda in cloudformation

Answer 7

defined either completely inline (no dependencies) or all as a zip in s3 then referenced in template