A Kubernetes runtime class not found error occurred. This typically indicates a configuration issue, resource constraint, or system problem. Review the error logs, check resource availability, and verify cluster configuration to resolve.
This error occurs when Kubernetes encounters an issue related to runtime class not found. The exact cause depends on your cluster configuration and workload requirements. Common causes include misconfiguration, resource unavailability, permission issues, or system constraints.
Review error details to understand the specific issue:
kubectl describe <resource-type> <name> -n <namespace>
kubectl get events -n <namespace> --sort-by='.lastTimestamp'Check the YAML specification for errors:
kubectl get <resource-type> <name> -n <namespace> -o yaml
kubectl apply --dry-run=client -f resource.yamlVerify sufficient resources are available:
kubectl top nodes
kubectl top pods -A
kubectl describe nodes | grep -E "Allocated|Requests"Check relevant component logs:
kubectl logs <pod-name> -n <namespace>
kubectl logs -n kube-system -l component=kubelet --tail=100Ensure proper permissions:
kubectl auth can-i <verb> <resource> --as=<user>
kubectl get rolebinding,clusterrolebinding -A | grep <resource>Check network and API server connectivity:
kubectl get nodes
kubectl get apiservices
kubectl get ep kubernetesReview Kubernetes documentation for the affected resource type:
kubectl explain <resource-type>
kubectl explain <resource-type>.specVisit https://kubernetes.io/docs/ for detailed guides.
Make necessary corrections:
kubectl apply -f fixed-resource.yaml
kubectl rollout status <resource-type>/<name>Monitor status until the error resolves.
For persistent issues, check component logs in kube-system namespace. Enable API audit logs to see what operations are being performed. Consider filing a bug report with the Kubernetes project if the issue appears to be a bug. In multi-cluster environments, verify all clusters have consistent configurations.
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