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I have the following condition, accordingly to that condition I create some resources, while if that condition is not met then I create other resources.
Conditions: ISProduction: "Fn::Equals": - !Ref Environment - staging ISNotProduction: "Fn::Not": - !Ref ISProduction However, when I try to evaluate the template with the snippet above I get the error:
Template error: every Fn::Not object requires one boolean parameter
How can I negate a condition in a Cloud Formation Template? Or how can I use the negation of ISProduction?
I also tried the Condition below in a resource creation, but I but the template do not pass the validation because "Every Condition member must be a string".
Condition: "Fn::Not": - !Ref ISProduction 
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According to the docs, Conditions should be used at the top level of the resource you want to conditionally create. Putting a Condition inside the Instance UserData section isn't supported. To use Conditions in your situation, you'd want separate Resources conditionally created based on the Parameter.
Fn::If. Returns one value if the specified condition evaluates to true and another value if the specified condition evaluates to false .
Pseudo parameters are parameters that are predefined by AWS CloudFormation. You don't declare them in your template. Use them the same way as you would a parameter, as the argument for the Ref function.
With conditions, you can define which resources are created and how they're configured for each environment type. Conditions are evaluated based on predefined pseudo parameters or input parameter values that you specify when you create or update a stack.
You can reference other conditions by using the Condition key before your Condition Logical ID.
Associating a Condition
To conditionally create resources, resource properties, or outputs, you must associate a condition with them. Add the Condition: key and the logical ID of the condition as an attribute to associate a condition, as shown in the following snippet. AWS CloudFormation creates the NewVolume resource only when the CreateProdResources condition evaluates to true.
Your example should look like this:
Conditions: ISProduction: "Fn::Equals": - !Ref Environment - staging ISNotProduction: "Fn::Not": - Condition: ISProduction Optionally you can write it in the short form:
Conditions: ISProduction: !Equals [!Ref Environment, staging] ISNotProduction: !Not [Condition: ISProduction] If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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