Hi All, Recently, I've come across some requirements for external integrations/resources that can be managed like stack resources (create,update,delete) from the stack. 1. Adding/Removing DNS records for instances created as part of a stack. 2. Integration with IPAM solutions for allocate/release of IPs (IP allocation pool for provider network) 3. Other custom integration for dynamic parameters to stacks. IMHO, it would probably make sense to create a custom resource like 'AWS CFN Custom Resource'[1] that can be used for these kind of use cases. I have created a blueprint[2] for this. Please let me know your thoughts on this. Regards, Rabi Mishra [1]http://blogs.aws.amazon.com/application-management/post/Tx2FNAPE4YGYSRV/Customers-CloudFormation-and-Custom-Resources [2]https://blueprints.launchpad.net/heat/+spec/implement-custom-resource