Errors in Kubernetes

  1. CrashLoopBackOff: Pod fails to start repeatedly.
  2. ImagePullBackOff: Kubernetes can’t pull the specified container image.
  3. ErrImagePull: Failure in pulling the image.
  4. Pending Pods: Pods remain in pending state due to lack of resources or node unavailability.
  5. Node NotReady: A node is not in a ready state, which prevents pods from running on it.
  6. OOMKilled: The pod gets killed because it uses more memory than allocated.
  7. Unauthorized: Authentication failure when trying to access resources.
  8. Forbidden: Authorization issue where the user does not have permissions.
  9. Evicted Pods: Pods are removed from a node due to resource constraints.
  10. PVC Bound Issues: PersistentVolumeClaims (PVCs) are not bound to PersistentVolumes (PVs).
  11. Service Not Accessible: Services are not reachable within or outside the cluster.
  12. DNS Resolution Failures: Pods cannot resolve DNS names within the cluster.
  13. Certificate Errors: TLS certificates are invalid or expired.
  14. API Server Unreachable: Cannot connect to the Kubernetes API server.
  15. Scheduler Failures: Pods are not being scheduled.
  16. Controller Manager Issues: Controllers aren’t managing resources properly.
  17. Network Plugin Errors: Issues with the network plugin can cause connectivity problems.
  18. Pod Stuck in Terminating State: Pod doesn’t terminate after issuing delete command.
  19. ConfigMap Not Found: Pod references a missing ConfigMap.
  20. Secret Not Found: Pod references a missing Secret.
  21. HPA Not Scaling: Horizontal Pod Autoscaler is not scaling as expected.
  22. Ingress Not Working: Ingress does not route traffic as expected.
  23. DaemonSet Pods Not Running: DaemonSet pods do not start on all nodes.
  24. Job Not Completing: Kubernetes Job fails to finish successfully.
  25. PVC Pending: PersistentVolumeClaim remains in “Pending” status.
  26. Node Disk Pressure: Node has high disk usage, causing evictions.
  27. Pod Affinity/Anti-Affinity Issues: Pods are unscheduled due to restrictive affinity rules.
  28. ServiceAccount Not Found: Pods reference a missing ServiceAccount.
  29. Node NotSchedulable: Node is marked as unschedulable, preventing pods from being placed.
  30. Readiness Probe Failures: Containers fail readiness checks, causing them to stay in a “Not Ready” state.
  31. Liveness Probe Failures: Containers fail liveness checks, resulting in restarts.
  32. Namespace Not Found: Resource references a non-existent namespace.
  33. ClusterRoleBinding Misconfiguration: Access issues due to incorrect ClusterRoleBinding setup.
  34. PVC Not Bound: PVC fails to bind to PV due to storage class mismatch.
  35. Node Memory Pressure: Nodes experience high memory pressure, causing evictions.
  36. Service Endpoint Not Updated: Service does not update endpoints, resulting in unreachable services.
  37. Endpoint Slices Issues: Endpoint slices are missing, causing network issues.
  38. DaemonSet Not Deploying on All Nodes: DaemonSet skips certain nodes.
  39. Finalizer Preventing Resource Deletion: Resource remains due to finalizers.
  40. Ingress 404 Errors: Requests to Ingress return 404.
  41. LoadBalancer IP Not Assigned: LoadBalancer service fails to get an external IP.
  42. HPA Targets Not Matching Metrics: HPA doesn’t scale as it’s not receiving target metrics.
  43. PersistentVolume Deleted but PVC Bound: PVC remains bound even though PV was deleted.
  44. Helm Release Fails: Helm fails due to missing charts or resources.
  45. API Version Deprecated: Using outdated API versions causes compatibility issues.
  46. Namespace Resource Quota Exceeded: Deployments fail due to resource quota limits in a namespace.
  47. Cannot Attach Volume to Multiple Pods: Persistent volumes with RWO access can’t be shared across pods.
  48. CPU Throttling: Containers experience high CPU throttling.
  49. Pods Evicted Due to Overcommit: Overcommitted resources lead to evictions.
  50. PodSecurityPolicy Issues: Pods fail to start due to restrictive PodSecurityPolicy.

Reference: 50 Kubernetes Errors & Solutions

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