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Mappings In AWS CloudFormation

This article describes the Mappings in AWS CloudFormation.

Purpose

Mappings in CloudFormation define key-value pairs that can be used to specify values based on conditions like AWS regions, instance types, or environments.

Example

Consider the following code: -

AWSTemplateFormatVersion: 2010-09-09
Resources:
  MyS3Bucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: 
        !FindInMap 
          - S3BucketMap
          - !Ref "AWS::Region"
          - BucketName

Mappings:
  S3BucketMap:
    us-east-1:
      BucketName: gyansangrah-bucket-useast1-xyz123
    us-east-2:
      BucketName: gyansangrah-bucket-useast2-xyz123
    us-west-2:
      BucketName: gyansangrah-bucket-uswest2-xyz123
    eu-central-1:
      BucketName: gyansangrah-bucket-eucentral1-xyz123

In the code above, we created a mapping for creating the bucket name based on the selected region. The "Fn::FindInMap" fetches values from a defined map within your CloudFormation template.

Output

Pseudo Parameters

The pseudo parameters are predefined in CloudFormation. In the preceding code, "AWS::Region" is a pseudo parameter.

Posted By -	Karan Gupta

Posted On -	Monday, March 24, 2025

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