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Symptoms

  • After a node reboot (kernel upgrade), pods on node-4.internal cannot communicate with pods on other nodes.
  • Pods on the node can reach the Kubernetes API server but not other pod IPs.
  • Newly created pods on this node get stuck in ContainerCreating with a CNI error.
  • Existing pods that survived the reboot show Running but their network connections time out.
  • The cluster uses Calico CNI with VXLAN encapsulation.
  • Other nodes in the cluster are unaffected.
  • kubelet logs show repeated CNI plugin errors.