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A Kubernetes Node requires to have at minimum one IP address because those are used on the Pods field HostIPs and in some cases, when pods uses hostNetwork: true, as PodIPs. Nodes that use IP addresses as Hostname are interpreted as an IP address, so it is possible that are nodes that don't hane any DNSname. The feature gate AllowDNSOnlyNodeCSR will allow user to opt-in for the old behavior. Change-Id: I094531d87246f1e7a5ef4fe57bd5d9840cb1375d