cfn-variable-repository

• cloudformation templates do not support variables and parameters in a template cannot reference other parameters

• cfn-variable-repository is a cloudformation custom-resource to define and refer to dynamic variables within the cloudformation stack lifecycle

• define your variables in the CfnVariableRepository.Repository, call them CfnVariableRepository.<VariableName> as many times as you need

• see implementation example

• do not use for secrets or sensitive data

deployment

• deploy cfn-variable-repository

aws cloudformation deploy --template-file ./template.yaml --stack-name variable-repository --capabilities CAPABILITY_NAMED_IAM

• implement and use a cfn-variable-repository

aws cloudformation deploy --template-file ./template-implementation.yaml --stack-name variable-repository-implementation --capabilities CAPABILITY_NAMED_IAM

• debug

aws logs tail "/aws/lambda/cfn-variable-repository" --follow

aws cloudformation describe-stacks --stack-name variable-repository-implementation

aws cloudformation describe-stacks --stack-name variable-repository-implementation --query 'Stacks[*].Outputs[*]'

• delete a stack

aws cloudformation delete-stack --stack-name variable-repository-implementation