kubernetes
18 minKubernetes Advanced Operations: Packet Paths, Rollouts, DNS, and Operators
Trace service traffic, prevent rollout 502s, debug CPU throttling and CoreDNS, and design conflict-safe controller reconciliation.
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Q&A
Q&AWhy can a pod be CPU-throttled while its node is only 40% busy?
CPU quota is enforced per container, so node-wide unused capacity may not be available beyond its limit.
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A container can exhaust its CFS quota during a period even if other node CPUs are idle. Inspect container throttling counters and request/limit values alongside latency. Decide whether the limit is needed, whether requests/HPA targets match demand, or whether CPU work should be reduced; do not infer container headroom from node averages.
kubernetes
8 minKubernetes Requests, Limits, and Autoscaling: A Practical Capacity Model
Connect pod resource requests and limits to scheduling, throttling, eviction risk, and Horizontal Pod Autoscaler behavior.