How to use two intrinsic functions in a tag key in Cloudformation

Question

I'm trying to add tags to a AWS::EKS::Nodegroup resource that contain an output exported by another stack:

```
Resources:
  Nodegroup:
    Type: AWS::EKS::Nodegroup
      Properties:
        Tags:
          firstKey: firstValue
          !Sub myString-${Fn::ImportValue: myExport}: secondValue
```

But I'm getting validation errors because the function's colon is being interpreted as the key/value separator: ```Nested mappings are not allowed in compact mappings```

Quoting as suggested [here](https://github.com/github/vscode-github-actions/issues/205#issuecomment-1570939183) does not help since the intrinsic function is then seen as a string and not executed.

I tried this form as suggested in the documentation:

```
Tags: !Sub
  - 'myString-${myExport}: secondValue'
  - myExport: !ImportValue myExport
```

But apart from getting a string instead of a needed object, I wouldn't know how to add more than one tag.

Is there a way to achieve what I need?

Oleksii Bebych · Answer

Try like this:
```
      Tags:
        - Key: firstKey
          Value: firstValue
        - Key: !Sub "myString-${myExport}"
          Value: secondValue
        - Key: anotherKey
          Value: !Sub "anotherString-${Fn::ImportValue myOtherExport}"
```

How to use two intrinsic functions in a tag key in Cloudformation

Add your answer

Relevant content