#Some common errors in #Kubernetes #troubleshooting
1. Pod in CrashLoopBackOff:
- Check the pod logs using kubectl logs.
- Ensure the required dependencies are available.
2. ImagePullBackOff:
- Verify the image name and availability.
- Check image pull secrets and registry authentication.
3. Invalid ClusterIP or Service Port:
- Ensure correct service and port configurations.
- Verify network policies and firewall rules.
4. NodeNotReady:
- Check the node's status with kubectl get nodes.
- Examine the kubelet logs on the node.
5. Insufficient Resources:
- Confirm resource requests and limits in pod specifications.
- Use kubectl describe to analyze resource allocations.
6. CrashLoopBackOff for Init Containers:
- Inspect init container logs and configurations.
- Ensure init container dependencies are satisfied.
7. ConfigMap or Secret Mounting Issues:
- Verify ConfigMap/Secret existence and correctness.
- Check pod configuration for volume mounts.
8. Pod stuck in Pending state:
- Investigate resource constraints on the nodes.
- Examine events with kubectl describe pod.
9. API Server Unreachable:
- Verify API server status.
- Check kubeconfig file for correct API server address.
10. Network Policy Restrictions:
- Inspect network policies.
- Ensure correct podSelector and policy rules.
11. RBAC Permission Issues:
- Validate service account permissions.
- Check ClusterRoleBindings and RoleBindings.
12. PersistentVolumeClaims (PVC) Pending:
- Check available storage classes.
- Ensure the requested storage is available.
13. NodePort Service Not Accessible:
- Confirm the node's firewall allows the specified port.
- Check Service and NodePort configurations.
14. Kube-proxy Issues:
- Inspect kube-proxy logs for errors.
- Verify kube-proxy configuration.
15. DNS Resolution Problems:
- Verify CoreDNS status.
- Check DNS policy and cluster DNS settings.
16. Pod Eviction Due to Resource Pressure:
- Check resource usage across nodes.
- Adjust resource limits or add more nodes.
17. NodeOutOfMemory:
- Inspect node memory usage.
- Check for memory leaks in applications.
18. Volume Mount Permissions:
- Ensure correct file permissions in mounted volumes.
- Verify SELinux or AppArmor settings.
19. Ingress Controller Misconfiguration:
- Validate Ingress resource configurations.
- Check the Ingress controller logs.
20. ETCD Cluster Issues:
- Check etcd pod logs.
- Verify etcd cluster health.
21. CNI Plugin Issues:
- Verify CNI plugin status on nodes.
- Check plugin configurations and logs.
22. Invalid Labels or Selectors:
- Ensure correct labels and selectors in resources.
- Use kubectl get with appropriate labels.
May 27, 2025 1.6K 10
