How to: Is there a way to update route53 DNS with a service members?
The new way going forward to do this will be with the external-dns project. https://github.com/kubernetes-incubator/external-dns

Older project with similar functionality: https://github.com/wearemolecule/route53-kubernetes
Future work in core kops: https://github.com/kubernetes/kops/tree/master/dns-controller