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, sets proxy_ndp alongside proxy_arp for gVisor pod-to-pod traffic, and repoints an ipv6 kubeconfig from [::1] at localhost so a client outside the Docker host can still reach the apiserver. 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. Pod IPs, pod-to-pod and Service allocation run once per requested family rather than only the primary one, on separate ports so a single [::] socket cannot serve IPv4 through v4-mapped addresses and mask the v4 path.
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Closing this one — the thread here is all self-review noise from iterating on the script, with no reviewer feedback to carry over. Refiled as #877 with the same commit for a clean read. |
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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.