CloudFormation

Infrastructure as code
Free of charge but pay for the underlying service
- Can see and estimate resources cost using template
Create many stacks for many apps, and many layers
- VPC Stacks
- Network Stacks
- App stacks
- Stacks are identified by name
  - deleting a stack deletes every single artifact was created by CloudFormation
Templates are uploaded to S3 and referenced in CloudFormation
- Can't edit previous template. Have to upload new version of template to AWS
Editing CloudFormation template
- Manual
  - use CloudFormation Designer
  - use web console to input parameter
- Automated (recommended)
  - Edit using YAML
  - Use AWS CLI to deploy template
Building Blocks
- Components
  - AWS Certified Developer (DVA-C01)/CloudFormation/Resources (mandatory): AWS resource
    - in the format of AWS::product-name::datatype-name
  - Parameters: inputs for template
  - Mappings: static variables for template
  - Outputs: References to what have been created
  - Conditions: List of conditions to perform
  - Metadata
- Helpers
  - References
  - Functions