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CoreDNS pod on worker node unable to reach API server on control plane #44

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wqld opened this issue Jun 24, 2024 · 1 comment

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wqld commented Jun 24, 2024

The CoreDNS pod deployed on a worker node cannot reach the Kubernetes API server on the control plane.

CoreDNS attempts to call the API server service (10.96.0.1).
The request is DNAT’d by iptables to 172.18.0.3:6443.
The packet routes from the container’s eth0 to the host’s cni0.
VXLAN encapsulates the packet, but continuous retransmissions occur (172.18.0.3 ? 10.244.1.4 TCP [TCP Retransmission] 6443 ? 40334 [SYN, ACK]).

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wqld self-assigned this

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wqld commented Jun 25, 2024 •

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It needs the ability to handle ClusterIP.
It seems that implementing service communication without relying on kube-proxy might resolve the issue.

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