Node local dns for dual-stack

[DockToFuture]

We set up kubernetes dual-stack clusters and want to use node-local dns. When checking the code I see that only one IP familiy is supported at time (

dns/cmd/node-cache/main.go

Lines 104 to 106 in fe97ec9

	for _, ip := range params.LocalIPs {
	if utilnet.IsIPv6(params.LocalIPs[0]) != utilnet.IsIPv6(ip) {
	return params, fmt.Errorf("unexpected IP Family for localIP - %q, want IPv6=%v", ip, utilnet.IsIPv6(params.LocalIPs[0]))

). What is the reason for that? Can we also add dual-stack support to the kubernetes node-cache?

[DockToFuture]

As an implementation proposal I suggest: #657.

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[DockToFuture]

/remove-lifecycle stale