Document Federation CoreDNS support.

[madhusudancs]

It is not entirely clear how to use CoreDNS as a DNS provider for federation. We need a doc walking through the setup.

cc @kubernetes/sig-federation-misc

[jaredbhatti]

Do you have further ideas of how this would fit into existing content? Need any guidance from the docs team?

[shashidharatd]

I would give it a try and come up with a draft in couple of days. any pointers that would help me in this task would be great and thanks for help offer.

[jaredbhatti]

Sure,

I'd suggest starting with the page template for tasks: https://kubernetes.io/docs/contribute/page-templates/

Do you know where you're going to put the page on the site?

[shashidharatd]

the federation deployment using CoreDNS would mostly be associated with this page https://kubernetes.io/docs/admin/federation/kubefed/

[madhusudancs]

@jaredbhatti this doc will probably be one of the user guides. I am not entirely sure under what sub-heading, but it should go somewhere there and should be easily discoverable from other federation docs such as the kubefed doc that @shashidharatd linked.

[marun]

kubernetes/kubernetes#40536 is the umbrella issue for tracking this and others targeting improvements in non-cloud deployment of the federation control plane.

[rihabbanday]

I am currently facing the issue mentioned in http://stackoverflow.com/questions/43759332/coredns-in-k8s-federation-in-on-prem-clusters-doesnt-work. I would appreciate if someone could tell me the reason of this behavior or possible fixes of this problem. I have followed all the steps mentioned in the documentation.

[chenopis]

Have you asked the kubernetes-dev group (https://groups.google.com/forum/#!forum/kubernetes-dev)?