My set up is Kubernetes 1.11 running on Centos 7 and the flannel overlay all on VMWare.
It doesn’t look like DNS requests ever get to coredns. I have busybox running in the cluster and here is the output of a nslookup .
kubectl exec -ti busybox -- nslookup kubernetes.default.svc.cluster.local 10.96.0.10
;; connection timed out; no servers could be reached
command terminated with exit code 1
On the master node this comand works:
kubectl --namespace=kube-system exec -ti coredns-78fcdf6894-9bnrr -c coredns -- nslookup kubernetes.default.svc.cluster.local 10.96.0.10
Server: 10.96.0.10
Address: 10.96.0.10#53
Name: kubernetes.default.svc.cluster.local
Address: 10.96.0.1
It seems like the request isn’t getting routed?