Mappings in Cloudformation Template

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The optional Mappings section of cloudformation template can be used to declare variables. It is like python dictionary. You use the “FindInMap” intrinsic function to retrieve values. For e.g.

Mappings:
  Function:
    SocialMediaMLFunction:
      S3Bucket: solutions
      S3Key: ai-driven-social-media-dashboard/v1.0.0/socialmediafunction.zip
    AddTriggerForFunction:
      S3Bucket: solutions
      S3Key: ai-driven-social-media-dashboard/v1.0.0/addtriggerfunction.zip
  Code:
    EC2Twitter:
      S3Bucket: solutions
      S3Key: ai-driven-social-media-dashboard/v1.0.0/ec2_twitter_reader.tar

If you want to refer to socialmediafunction.zip file along with it’s path, then use…

S3Key: !FindInMap [ Function, SocialMediaMLFunction, S3Key]

And this statement will generate the URL that can be used to download the file…

EC2TwitterCode: !Join [”, [‘https://s3.’, !Ref ‘AWS::Region’, ‘.amazonaws.com/’, !Join [‘-‘, [!FindInMap [ Code, EC2Twitter, S3Bucket], !Ref ‘AWS::Region’]], ‘/’, !FindInMap [ Code, EC2Twitter, S3Key]]]
 
The output will look something like this…

https://s3.us-east-1.amazonaws.com/solutions-us-east-1/ai-driven-social-media-dashboard/v1.0.0/ec2_twitter_reader.tar
_____

Here is another example:

Value: !FindInMap [RegionAndInstanceTypeToAMIID, !Ref “AWS::Region”, !Ref EnvironmentType]

If your current region is us-east-1 and if the user has selected “test” environment as a parameter while creating the template, then the value returned will be “ami-8ff710e2” from this mapping:

 Mappings:
    RegionAndInstanceTypeToAMIID:
      us-east-1:
        test: “ami-8ff710e2”
        prod: “ami-f5f41398”
      us-west-2:
        test: “ami-eff1028f”
        prod: “ami-d0f506b0”

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