hack: make the kind cluster's IP family configurable - #827
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hack: make the kind cluster's IP family configurable#827Yuan Gao (ygao-g) wants to merge 1 commit into
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KIND_IP_FAMILY selects ipv4, ipv6 or dual and becomes networking.ipFamily, leaving kind's per-family subnet defaults alone. The script also recreates a pre-IPv6 "kind" Docker network, fails fast if the daemon has IPv6 off, and sets proxy_ndp alongside proxy_arp for gVisor pod-to-pod traffic. Tested on kind with all three families using the new hack/verify-kind-networking.sh, which checks node InternalIPs, ClusterIPs, pod IPs, pod-to-pod, CoreDNS, and a pull through the local registry.
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KIND_IP_FAMILYselectsipv4,dual, oripv6and passes this through to kind. To prevent insidious failures like pods stuck inContainerCreating, the script now drops old Docker networks to force IPv6 recreation if needed, validates the daemon's IPv6 support up-front, and enablesproxy_ndp(alongsideproxy_arp) to properly support gVisor loopback pod-to-pod networking across IPv6 nodes.The networking setup is fully validated using the newly added
hack/verify-kind-networking.sh, which confirms reliable IPv6 distribution across Node IPs, Service ClusterIPs, Pod IPs, Registry configurations, and CoreDNS lookups.