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

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