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Ibrahim S
Ibrahim S

Posted on • Edited on

Kubernetes common errors

  1. CrashLoopBackOff:

    • Description: A pod repeatedly crashes and restarts.
    • Troubleshooting:
    • Check pod logs: kubectl logs <pod-name>.
    • Describe the pod for more details: kubectl describe pod <pod-name>.
    • Investigate the application's start-up and initialization code.
  2. ImagePullBackOff:

    • Description: Kubernetes cannot pull the container image from the registry.
    • Troubleshooting:
    • Verify the image name and tag.
    • Check the image registry credentials.
    • Ensure the image exists in the specified registry.
  3. Pending Pods:

    • Description: Pods remain "Pending" and are not scheduled.
    • Troubleshooting:
    • Check node resources (CPU, memory) to ensure there is enough capacity.
    • Ensure the nodes are labeled correctly if using node selectors or affinities.
    • Verify there are no taints on nodes that would prevent scheduling.
  4. Node Not Ready:

    • Description: One or more nodes are in a "NotReady" state.
    • Troubleshooting:
    • Check node status: kubectl describe node <node-name>.
    • Review kubelet logs on the affected node.
    • Ensure the node has network connectivity.
  5. Service Not Working

    • Description: Services are not accessible or routing traffic correctly.
    • Troubleshooting:
    • Check the service and endpoints: kubectl get svc and kubectl get endpoints.
    • Verify network policies and firewall rules.
    • Ensure the pods backing the service are healthy and running.
  6. Insufficient Resources:

    • Description: Pods cannot be scheduled due to insufficient resources.
    • Troubleshooting:
    • Review resource requests and limits in pod specifications.
    • Scale the cluster by adding more nodes.
  7. PersistentVolume Claims Pending:

    • Description: PVCs remain in a "Pending" state.
    • Troubleshooting:
    • Check if there are available PVs that match the PVC specifications.
    • Ensure the storage class exists and is configured correctly.
    • Verify that the underlying storage backend is healthy.
  8. Pod Stuck Terminating:

    • Description: Pods get stuck in a "Terminating" state.
    • Troubleshooting:
    • Check for finalizers that might be preventing pod deletion.
    • Review the logs for shutdown hooks or long-running processes.
    • Force delete the pod if necessary: kubectl delete pod <pod-name> --force --grace-period=0.
  9. DNS Resolution Issues:

    • Description: DNS lookups within the cluster fail.
    • Troubleshooting:
    • Check the DNS pod logs (e.g., CoreDNS): kubectl logs <coredns-pod>.
    • Ensure the DNS service is running: kubectl get svc -n kube-system.
    • Verify network policies and firewall rules do not block DNS traffic.

More errors Kubernetes Errors With Solution

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