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Find in Map

The Fn::FindInMap function in CloudFormation allows lookups from the mappings section.

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

KloudFormation provides the FindInMap class. Here is an example of looking up machine images based on region and AMI architecture:

val regionMappings = "RegionMap"
val usEast1 = "us-east-1"
val usWest1 = "us-west-1"
val hvm64 = "HVM64"
val hvmG2 = "HVMG2"
mappings(
        regionMappings to mapOf(
                usEast1 to mapOf(
                        hvm64 to +"ami-0ff8a91507f77f867",
                        hvmG2 to +"ami-0a584ac55a7631c0c"
                ),
                usWest1 to mapOf(
                        hvm64 to +"ami-0bdb828fd58c52235",
                        hvmG2 to +"ami-066ee5fd4a9ef77f1"
                )
        )
)

instance {
    instanceType("m1.small")
    imageId(FindInMap(+regionMappings, awsRegion, +hvm64))
}

Produces

Mappings:
  RegionMap:
    us-east-1:
      HVM64: "ami-0ff8a91507f77f867"
      HVMG2: "ami-0a584ac55a7631c0c"
    us-west-1:
      HVM64: "ami-0bdb828fd58c52235"
      HVMG2: "ami-066ee5fd4a9ef77f1"
Resources:
  Instance:
    Type: "AWS::EC2::Instance"
    Properties:
      ImageId:
        Fn::FindInMap:
        - "RegionMap"
        - Ref: "AWS::Region"
        - "HVM64"
      InstanceType: "m1.small"