RFE Feature Gate Enable DNS CACHE

[timothysc]

Tracking Issue kubernetes/kubernetes#70707

What would you like to be added:
Support to run nodelocaldns addon

Why is this needed:
The feature runs a local dns cache on all cluster nodes to help with dns latency. Initial PR adds support on e2e/gce scripts. We want to extend this to other cluster creation tools.
#70555

This is the KEP: https://github.com/kubernetes/community/blob/master/keps/sig-network/0030-nodelocal-dns-cache.md
Follow up to the KEP - kubernetes/community#2842

/kind feature

[srueg]

I'm taking a shot at this: kubernetes/kubernetes#71642
Feedback appreciated.

[luxas]

Thanks @srueg!

[neolit123]

closed the existing PRs let's discuss again how we want to approach this in the 1.15 cycle.

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[neolit123]

/lifecycle frozen

[timothysc]

IMO we should make this the default for 1.16 and update the deployment.

[stealthybox]

We aspire to enable users to do this with an addon operator + the upcoming kubeadm addon-installer library/component-config integration.

See kubernetes-sigs/cluster-addons#34

Closing in favor of that approach.
( +3 from kubeadm office hours - Nov13 attendees )