Hi,

I'm running a Stateful Set with Headless Service (db-0, db-1, db2) similar 
to the Cassandra example here 
<https://kubernetes.io/docs/tutorials/stateful-application/cassandra/>

However, when the pods start up they cannot ping each:

> kubectl exec -it db-0 -- ping db-1
ping: unknown host

My cluster was created by kubeadm and I can see the kube-dns pod is running.
Am I missing something or are there logs I can check?

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