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How to Diagnose Kubernetes OOMKilled Errors With a Structured Remediation Plan

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OOMKilled is one of the most frequent and misread failure signals in Kubernetes, occurring when a container exceeds its memory limit and the Linux OOM killer terminates the process, logging exit code 137. A common mistake is raising memory limits arbitrarily or removing them entirely, which can destabilize neighboring workloads on the same node through evictions. The correct diagnostic approach involves reading Pod termination state via kubectl, distinguishing between memory requests — which affect scheduling — and limits, which govern kill behavior. Operators should confirm OOMKilled status through Last State fields in kubectl describe output before making any resource changes. Tools like kprompt can assist by detecting OOM findings and proposing memory patches, while keeping any cluster changes behind a human-approval step.

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