I have kube-dns running in a (bare metal) cluster. I know that it works, as I can interpolate a service to a name I've created and get a host entry:
$ host elk-service-headless.default.svc.cluster.local
elk-service-headless.default.svc.cluster.local has address 10.42.0.151
elk-service-headless.default.svc.cluster.local has address 10.42.0.152
elk-service-headless.default.svc.cluster.local has address 10.42.0.153
(...)What I can't figure out how to do is to list all of the records that kube-dns is holding. I've tried the standard DNS tricks like dig and host -l and can't get them. But in any case, there must be a way to do this from Kubernetes itself. I tried inspecting ConfigMaps and didn't find what I'm looking for.
If you are using kube-dns, it use dnsmaq to cache DNS record, you can dump record by this answer.
If you are using coredns, it embed a cache plugin to cache DNS record, and I find no way to get data in this cache plugin. But I find coredns can use etcd as backend, so the DNS record can be cached in etcd, but this need to reconfig your coredns with this Corefile:
.:53 {
etcd {
path /skydns
endpoint <etcd_endpoint>
upstream /etc/resolv.conf
}
...
}