CloudFormation Nested Stacks

• Nested Stacks allow re-use of CloudFormation code for common use cases
• E.g. standard configuration for a load balancer, web server, application server, etc.
• Instead of copying out the code each time, create a standard template for each common use case, store it in S3, and reference from within your CloudFormation template.

Resources:
  Type: AWS::CloudFormation::Stack
  Properties:
    NotificationARNs:
      - String
    Parameters:
      AWS CloudFormation Stack Parameters
    Tags:
      - Resource Tag
    TemplateURL: https://s3.amazonaws.com/.../template.yml
    TimeoutInMinutes: Integer

The only element that is mandatory is the TemplateURL property.