Use no-DNS approach for gossip

[justinsb]

Although we run a full gossip system, in practice to seed that gossip we need to discover peers from the cloud APIs. And in practice, the only endpoints we actually discover via gossip are the ones we probably already found through seeding.

@hakman 's work to support no-DNS clusters suggests an alternative, where we simply use the seeding/discovery mechanism instead of a full gossip stack.

There is the chance that e.g. the control plane might be restarted and change IPs, so we can't in general rely on the no-DNS support directly (which assumes a stable IP, such as a load balancer IP); we would likely have to periodically refresh IPs. But this would be a much simpler implementation (and let us close off another TCP/UDP port).

/kind feature

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/lifecycle stale

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/lifecycle rotten

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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

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The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

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• After 90d of inactivity, lifecycle/stale is applied
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/close not-planned

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