Cloudformation EIP Reverse DNS

Question

Hello,

Is it possible to assign a [reverse DNS name](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/elastic-ip-addresses-eip.html#Using_Elastic_Addressing_Reverse_DNS) to an `AWS::EC2::EIP` resource via CloudFormation?

Thanks.

Answer

I don't believe this is possible via the AWS::EC2::EIP resource type. You could create a custom resource (or a registry resource) to call the ModifyAddressAttribute API (e.g. via boto3) which could update the EIP configuration after it's created.

However, there's a requirement that the reverse DNS entry has a matching forward DNS, so you would also need to create a suitable DNS entry (either in Route53, or in your own DNS system which again would be via a custom resource) before CloudFormation creates/updates the reverse DNS. You can use the DependsOn attribute if necessary for that.

However, there's a requirement that the reverse DNS entry has a matching forward DNS, so you would also need to create a suitable DNS entry (either in Route53, or in your own DNS system which again would be via a custom resource) before CloudFormation creates/updates the reverse DNS. You can use the `DependsOn` attribute if necessary for that.

Answer

Thanks for the response, I'll look into creating a custom resource. Longer term, is it possible to create a feature request for this functionality within Cloudformation itself?

Cloudformation EIP Reverse DNS

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