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Yan Bondarenko
dc362fa591
On the kube-ovn variants Cilium allocates no pod addresses, but the agent still takes its router IP and the Gateway API Ingress IP from its allocation CIDR. In ipam.mode kubernetes that is Node.spec.podCIDR, which the documented installs slice from the same range kube-ovn allocates pods from, so kube-ovn sooner or later hands a pod an address Cilium already holds. Cilium now runs ipam.mode cluster-pool on the kube-ovn variants, with a /29 per node from the last /21 of networking.podCIDR, and kube-ovn excludes that /21 through --default-exclude-ips. The block stays inside the pod CIDR on purpose. Envoy reaches Gateway API backends from the node's Ingress IP, and kube-ovn masquerades host-originated traffic only when the source lies in one of its subnets, so a block outside them such as 100.65.0.0/16 breaks Gateway API traffic that crosses nodes. A post-upgrade hook moves existing clusters. It first checks that the block has a /29 for every node and lies inside kube-ovn's default subnet, and stops without changing anything otherwise. It adds the block and every node's current Ingress IP to excludeIps of that subnet, because the agent keeps a former Ingress IP in its ipcache as reserved:ingress. It then waits until kube-ovn stops offering the block and stops if an address in it is still allocated. kube-ovn leaves excluded addresses out of the subnet status, so that check reads its IP objects. Then, one node at a time, it clears the inherited /24 from the CiliumNode, waits for the operator to allocate from the block and restarts the agent. networking.podCIDR now needs a prefix of /20 or shorter on the kube-ovn variants, and the render fails otherwise. A /21 cut into /29s also caps these variants at 256 nodes. Assisted-by: LLM Signed-off-by: Yan Bondarenko <202671653+yankawai@users.noreply.github.com>