AWS::CloudFormation::StackSet - return instance Outputs

[mo7ty]

Name of the resource

AWS::CloudFormation::StackSet

Resource name

No response

Description

It would be a great help for the AWS community using CloudFormation templates for IaC to have AWS::CloudFormation::StackSet returning not just its logical ID, but also be able to return its instance Outputs.

Usage template sample:

WAFStackSet:
  Type: AWS::CloudFormation::StackSet
  Properties:
    StackSetName: WAFStackSet
    Description: CloudFormation StackSet used to provision WAF resources
    PermissionModel: SELF_MANAGED
    StackInstancesGroup:
      - DeploymentTargets:
          Accounts: [!Ref "AWS::AccountId"]
        Regions: [us-east-1]
    TemplateBody: |
      AWSTemplateFormatVersion: 2010-09-09
      Description: WAF Stack
      Resources:
        WebACL:
          Type: AWS::WAFv2::WebACL
          Properties:
          ...
      Outputs:
        WAFWebACLId:
          Value: !GetAtt WebACL.Id

CloudFrontDistribution:
  Type: AWS::CloudFront::Distribution
  Properties:
    DistributionConfig:
      WebACLId: !GetAtt WAFStackSet.Outputs.WAFWebACLId
      ...

With this improvement being a solution to overcome limitations like:

• AWS::CertificateManager::Certificate - Region #523
• WAFv2 Regional Limitations - CloudFormation Regression #546

Because there are also missing:

• AWS::CloudFormation::Stack - Region #562
• Ability to reference outputs across regions #630

Additional references from re:Post that would benefit with this:

• How to access StackSet instances outputs | AWS re:Post
• Reference cross-instance StackSet outputs | AWS re:Post

Other Details

No response

[mo7ty]

Using Boto3 CloudFormation Client is possible to get AWS::CloudFormation::StackSet outputs:

import boto3

# stack_set_name = !GetAtt WAFStackSet.Outputs.WAFWebACLId

cloudformation = boto3.client('cloudformation')
response = cloudformation.list_stack_instances(StackSetName=stack_set_name)
region = response["Summaries"][0]["Region"]
stack_id = response["Summaries"][0]["StackId"]

cloudformation = boto3.client('cloudformation', region_name=region)
response = cloudformation.describe_stacks(StackName=stack_id)
outputs = response["Stacks"][0]["Outputs"]

result = {output["OutputKey"]: output["OutputValue"] for output in outputs}
print("result={}".format(result))