Kubernet Interview Cheat Sheet

1. What problem does Kubernetes fundamentally solve compared to running containers manually?

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2. What is a Kubernetes Cluster made of?

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3. What is a Pod in Kubernetes and why isn’t a container scheduled directly?

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4. What is the role of the Kubelet on every worker node?

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5. Why does every Pod get its own IP address?

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6. What is a Deployment used for?

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7. What is the difference between a Deployment and a StatefulSet?

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8. What is a Service in Kubernetes?

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9. What does a ClusterIP Service do?

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10. Why is a NodePort Service rarely used in production?

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11. What is the purpose of an Ingress Controller?

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12. What is etcd and why is it critical to Kubernetes?

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13. How does Kubernetes handle container restarts inside Pods?

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14. What does desired state mean in Kubernetes?

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15. What is a ReplicaSet and how does it relate to Deployments?

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16. Why should ConfigMaps not be used for sensitive data?

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17. What is a Kubernetes Secret?

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18. What is the purpose of a Namespace?

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19. What is a Node in Kubernetes?

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20. What happens when a Node becomes NotReady?

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21. How does Kubernetes ensure Pods are rescheduled automatically when a node fails?

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22. Why do Pods restart even when their containers exit with code 0?

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23. What is the role of kube-proxy in networking?

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24. How do readiness probes differ from liveness probes?

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25. What is the Kubernetes API Server responsible for?

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26. Why is using latest tag dangerous in Kubernetes deployments?

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27. What is the difference between a DaemonSet and a Deployment?

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28. How does a Horizontal Pod Autoscaler know when to scale?

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29. Why do StatefulSets require a Headless Service?

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30. What is a PersistentVolume (PV)?

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31. What is the difference between PV and PVC?

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32. What is a StorageClass used for?

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33. Why do Pods sometimes remain in a Terminating state indefinitely?

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34. How does Kubernetes perform rolling updates without downtime?

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35. What is the purpose of a Pod Disruption Budget?

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36. Why are jobs used instead of Deployments for batch tasks?

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37. What is the role of a CronJob?

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38. What is image pull policy and why does it matter?

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39. Why is RBAC important in Kubernetes?

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40. What is a ServiceAccount?

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41. Why disable auto-mount of ServiceAccount tokens in some Pods?

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42. How do Kubernetes Labels differ from Annotations?

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43. What is tainting a node and why is it used?

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44. What are Node Selectors?

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45. Why is node affinity more powerful than node selectors?

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46. What is Pod Affinity/Anti-Affinity?

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47. Why is Ingress preferred over multiple LoadBalancer Services?

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48. How does Kubernetes handle service discovery internally?

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49. What is the difference between a Secret of type Opaque and DockerConfigJson?

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50. Why avoid large ConfigMaps?

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