I don't have much content on CoreDNS. But from the description in the README, https://github.com/coredns/coredns/blob/master/README.md, I guess it acts as a flexible and programmable entry service for underlying services and can do many applications such as Load Balance, depending on plugins.

We've been using CoreDNS for a bit now, and it's much better than KubeDNS. We found that KubeDNS would time out and drop requests from time to time. No such issues with CoreDNS. Would recommend (at least from a reliability standpoint).

Thanks for sharing. How are you monitoring timeouts and dropped requests on KubeDNS?

We were running with shorter TTL's on service records, and upstream apps threw rashes of errors when queries timed out.