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[release-4.20] OCPBUGS-77357: Clear stale conntrack UDP entries for nodePorts #3012

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Merged
openshift-merge-bot merged 2 commits into from
Mar 5, 2026
Merged

[release-4.20] OCPBUGS-77357: Clear stale conntrack UDP entries for nodePorts #3012

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46ce09a
Clear stale conntrack UDP entries for nodePorts
pliurh Aug 27, 2025
679442d
Add a e2e test for NodePort service
pliurh Sep 8, 2025
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13 changes: 12 additions & 1 deletion go-controller/pkg/node/default_node_network_controller.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1474,13 +1474,24 @@ func (nc *DefaultNodeNetworkController) reconcileConntrackUponEndpointSliceEvent
klog.Errorf("Failed to get service port for endpoint %s: %v", oldIPStr, err)
continue
}
// upon update and delete events, flush conntrack only for UDP
// upon update and delete events, flush UDP conntrack for Service port
klog.V(5).Infof("Deleting conntrack entry for endpoint %s, port %d, protocol %s", oldIPStr, servicePort.Port, *oldPort.Protocol)
if err := util.DeleteConntrackServicePort(oldIPStr, servicePort.Port, *oldPort.Protocol,
netlink.ConntrackReplyAnyIP, nil); err != nil {
klog.Errorf("Failed to delete conntrack entry for %s port %d: %v", oldIPStr, servicePort.Port, err)
errors = append(errors, err)
}

// Flush UDP conntrack entries for NodePort (and LoadBalancer services that allocate NodePorts)
// TODO: Once vishvananda/netlink support ConntrackFilterType '--reply-port-src', we can use one DeleteConntrackServicePort() call
// conntrack entries for both ClusterIP and NodePort.
if util.ServiceTypeHasNodePort(svc) && servicePort.NodePort > 0 {
if err := util.DeleteConntrackServicePort(oldIPStr, servicePort.NodePort, *oldPort.Protocol,
netlink.ConntrackReplyAnyIP, nil); err != nil {
klog.Errorf("Failed to delete conntrack entry for %s NodePort %d: %v", oldIPStr, servicePort.NodePort, err)
errors = append(errors, err)
}
}
}
}
}
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