-
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.
-
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.
-
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.
-
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.
-
Service Not Working
- Description: Services are not accessible or routing traffic correctly.
- Troubleshooting:
- Check the service and endpoints:
kubectl get svc
andkubectl get endpoints
. - Verify network policies and firewall rules.
- Ensure the pods backing the service are healthy and running.
-
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.
-
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.
-
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
.
-
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.
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