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Two Kubernetes Pitfalls: Node Sizing and Probe Misconfiguration Explained

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A DevOps team running Kubernetes clusters identified two underappreciated configuration decisions that can cause serious failures under stress. On node sizing, switching from 10 large 32-CPU nodes to 20 smaller 16-CPU nodes halved the blast radius of a single node failure, cutting rescheduling time from 10 minutes to 90 seconds at no extra cost. On probe configuration, a team that set readiness and liveness probes to the same logic triggered a cascade of 30 pod restarts per minute when a database slowed down, because Kubernetes killed pods that were merely unready rather than truly broken. The fix is to use separate probes: readiness should check whether a pod can currently handle traffic, while liveness should only trigger a restart if the process is fundamentally unresponsive. Both issues appear harmless during normal operations but expose hidden failure modes under real-world stress conditions.

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Two Kubernetes Pitfalls: Node Sizing and Probe Misconfiguration Explained · ShortSingh