wehub-resource-sync
4b6817381b
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39 lines
2.0 KiB
YAML
39 lines
2.0 KiB
YAML
root_cause_category: infrastructure
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required_keywords:
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- node
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- Unknown
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- kubelet
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forbidden_categories:
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- healthy
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- unknown
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- resource_exhaustion
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- code_defect
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- data_quality
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optimal_trajectory:
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- get_eks_node_health
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- list_eks_pods
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- get_eks_events
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max_investigation_loops: 3
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ruling_out_keywords:
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- healthy node
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- not at fault
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required_queries:
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- get_eks_node_health
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- list_eks_pods
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model_response: |
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ROOT_CAUSE: Node ip-10-0-1-73.us-east-1.compute.internal has stopped reporting kubelet heartbeat to the control plane; the node condition has flipped to Ready=Unknown with MemoryPressure=True, and pods scheduled to that node show phase=Unknown with condition Ready=Unknown reason=NodeLost. Sibling node ip-10-0-1-42 is Ready and its pod is Running, isolating the failure to the node rather than the workload.
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ROOT_CAUSE_CATEGORY: infrastructure
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VALIDATED_CLAIMS:
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- Node ip-10-0-1-73.us-east-1.compute.internal condition Ready=Unknown with MemoryPressure=True. [evidence: eks_node_health]
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- Node ip-10-0-1-42.us-east-1.compute.internal is Ready=True with no pressure conditions. [evidence: eks_node_health]
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- Pod on the failing node shows phase=Unknown reason=NodeLost; the pod on the healthy node is Running and Ready. [evidence: eks_pods]
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- Warning event NodeNotReady 'Node ip-10-0-1-73 status is now: NodeNotReady' corroborates the node-level failure. [evidence: eks_events]
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NON_VALIDATED_CLAIMS:
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- Underlying cause is infrastructure-side (kubelet crash, control-plane connectivity loss, or EC2 instance impairment) — workload owners cannot resolve this from inside the pod.
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- Cordoning and draining the unhealthy node, then letting the deployment reschedule, would restore capacity.
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CAUSAL_CHAIN:
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- Kubelet on ip-10-0-1-73 stops reporting to the control plane, the node controller flips Ready to Unknown after the grace period, the scheduler marks pods on that node phase=Unknown, a NodeNotReady event is emitted, pod-eviction-timeout has not yet elapsed, and capacity stays degraded while the healthy node serves all traffic.
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