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diff --git a/health/guides/kubelet/kubelet_node_config_error.md b/health/guides/kubelet/kubelet_node_config_error.md new file mode 100644 index 000000000..695a479c9 --- /dev/null +++ b/health/guides/kubelet/kubelet_node_config_error.md @@ -0,0 +1,56 @@ +### Understand the alert + +This alert, `kubelet_node_config_error`, is related to the Kubernetes Kubelet component. If you receive this alert, it means that there is a configuration-related error in one of the nodes in your Kubernetes cluster. + +### What is Kubernetes Kubelet? + +Kubernetes Kubelet is an agent that runs on each node in a Kubernetes cluster. It ensures that containers are running in a pod and manages the lifecycle of those containers. + +### Troubleshoot the alert + +1. Identify the node with the configuration error + + The alert should provide information about the node experiencing the issue. You can also use the `kubectl get nodes` command to list all nodes in your cluster and their statuses: + + ``` + kubectl get nodes + ``` + +2. Check the Kubelet logs on the affected node + + The logs for Kubelet can be found on each node of your cluster. Login to the affected node and check its logs using either `journalctl` or the log files in `/var/log/`. + + ``` + journalctl -u kubelet + ``` + or + ``` + sudo cat /var/log/kubelet.log + ``` + + Look for any error messages related to the configuration issue or other problems. + +3. Review and update the node configuration + + Based on the error messages you found in the logs, review the Kubelet configuration on the affected node. You might need to update the `kubelet-config.yaml` file or other related files specific to your setup. + + If any changes are made, don't forget to restart the Kubelet service on the affected node: + + ``` + sudo systemctl restart kubelet + ``` + +4. Check the health of the cluster + + After the configuration issue is resolved, make sure to check the health of your cluster using `kubectl`: + + ``` + kubectl get nodes + ``` + + Ensure that all nodes are in a `Ready` state and no errors are reported for the affected node. + +### Useful resources + +1. [Kubernetes Documentation: Kubelet](https://kubernetes.io/docs/concepts/overview/components/#kubelet) +2. [Kubernetes Troubleshooting Guide](https://kubernetes.io/docs/tasks/debug-application-cluster/troubleshooting/)
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