CODEWITHSUNDEEP
amazon-web-servicesaws-cloudformation
pandith padaya
pandith padaya

Reputation: 1993

AWS CloudFormation, refer parameters in tags

I am trying to apply a set of tags to a SNS topic and one of the tags refer to a parameter. Given below is an extract of the template I have (I have reduced the tags to highlight my problem)

AWSTemplateFormatVersion: 2010-09-09
Description: Deploys resources 

Parameters:
  MyParameter:
    Type: String
    Default: "testEnvironment"

Mappings:
  Mp1:
    Mp1-1:
      tags:
        - Key: key1
          Value: !Ref MyParameter

Resources:
  snsTopic:
    Type: AWS::SNS::Topic
    Properties:
      DisplayName: snsTopic
      TopicName: snsTopic
      Tags: !FindInMap [Mp1, Mp1-1, tags]

Now when I run this on CloudFormation I get the following error:

Every entry in list for property Tags must be a map of String

Does someone know how to fix this or what I am doing wrong?

Upvotes: 2

Views: 4439

Answers (1)

Marcin
Marcin

Reputation: 238747

You can't define Mappings in this way. Docs clearly say that:

You cannot include parameters, pseudo parameters, or intrinsic functions in the Mappings section.

So your Mapping should be

Mappings:

  Mp1:
    Mp1-1:
      tags:
        - Key: key1
          Value: MyValue # <-- No !Ref here, just fixed string

If you want to !Ref MyParameter, then you should put it in the AWS::SNS::Topic resource. 

Resources:
  snsTopic:
    Type: AWS::SNS::Topic
    Properties:
      DisplayName: snsTopic
      TopicName: snsTopic
      Tags: 
        - Key: key1
          Value: !Ref MyParameter

Upvotes: 1

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