Table of contents

• Sub

Sub

In CloudFormation Fn::Sub is used to substitute variables into a template string.

Info on Fn::Sub from AWS can be found here

In KloudFormation you need to create an instance of Sub.

For KloudFormation, it is recommended to use the simpler Join

val rootDomainName = parameter<String>("RootDomainName")
outputs(
        "Domain" to Output(Sub("www.${'$'}{Domain}", mapOf("Domain" to rootDomainName.ref())))
)

Produces

Parameters:
  RootDomainName:
    Type: "String"
Resources: {}
Outputs:
  Domain:
    Value:
      Fn::Sub:
      - "www.${Domain}"
      - Domain:
          Ref: "RootDomainName"