Amazon-CloudFormation [SOLVED]: Cloudformation SNS template validation error

Tagged: amazon-cloudformation, amazon-sns

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January 3, 2018 at 2:13 am #247029

Cloudy Point

Keymaster

Question

I am trying to create sns subscription but I am getting template validation error.

‘MySNSTopic’ is the Logical ID of the cloudformation stack called testsnstopic.

Is this correct. Can anyone explain what value I should give for ‘Ref’ here

"TopicArn" : {
        "Ref": "MySNSTopic"
        }

Template validation error:

Template format error: Unresolved resource dependencies [MySNSTopic] in the Resources block of the template

code:

{
"Resources": {
"MySubscription" : {
  "Type" : "AWS::SNS::Subscription",
  "Properties" : {
    "Endpoint" : "test@abc.com",
    "Protocol" : "email",
    "TopicArn" : {
    "Ref": "MySNSTopic"
    }
  }
}
}
}

January 3, 2018 at 2:13 am #247030

Cloudy Point

Keymaster

Answer

To use properties across different stacks, you need to explicitly export the values on the one end and import into the other stack.

In your case you would propably need something like this:

Stack: sns-test

{
    "Resources": {
        "MySNSTopic": {
            "Type": "AWS::SNS::Topic"
        }
    },
    "Outputs": {
        "MySNSTopicOutput": {
            "Description": "SNS topic arn",
            "Value": {
                "Ref": "MySNSTopic"
            },
            "Export": {
                "Name": {
                    "Fn::Sub": "${AWS::StackName}-MySNSTopicExport"
                }
            }
        }
    }
}

Stack: sns-subscription

{
  "Resources": {
    "MySubscription": {
      "Type": "AWS::SNS::Subscription",
      "Properties": {
        "Endpoint": "jens@apimeister.com",
        "Protocol": "email",
        "TopicArn": {
          "Fn::ImportValue" : "sns-test-MySNSTopicExport"
        }
      }
    }
  }
}

Source: https://stackoverflow.com/questions/47917472/cloudformation-sns-template-validation-error
Author: jens walter

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

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