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Lessons (4)

• Troubleshooting Playbook

  A repeatable method for diagnosing Pending, CrashLoopBackOff, ImagePullBackOff, OOMKilled and unreachable Services. Work from the outside in Do …

• Resources, QoS and Scheduling Control

  … Going over a memory limit kills it ( OOMKilled ). - A common practice: always set memory request equal to memory …

• Pods: Where Your App Actually Runs

  … permission is wrong Check image and registry access OOMKilled The app used more memory than allowed Investigate usage …

• Internals, Upgrades, Resilience and Interview Questions

  … scheduling; limits are runtime ceilings (CPU throttles, memory OOMKills). QoS classes Guaranteed, Burstable and BestEffort decide eviction order …