To debug, you can `kubectl exec` into a kubedns pod and inspect the
/etc/resolv.conf it got.

On Tue, Oct 18, 2016, 01:52 'Tim Hockin' via Kubernetes user discussion and
Q&A <kubernetes-users@googlegroups.com> wrote:

> kube-dns should pass-thru to whatever nameserver(s) are configured in
> the node's resolv.conf
>
> On Mon, Oct 17, 2016 at 1:11 PM, Todd VanderVeen
> <todd.vanderv...@collectivemedicaltech.com> wrote:
> > I've setup a k8s 1.4 cluster with the kubedns addon. In-cluster
> resolution
> > is working as expected, but external names cannot be resolved. As I
> > understand it, the nodes defined nameservers are used for resolution
> (with
> > the caveat that only 3 entries are permitted, with skydns taking one)
> > outside of the cluster. Am I misunderstanding this  expected behavior,
> or do
> > external nameservers need to be explicitly configured somehow?
> >
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