K3s is a lightweight Kubernetes distribution designed for resource-constrained environments and edge computing. It simplifies the deployment and management of Kubernetes clusters by reducing the complexity and resource requirements typically associated with Kubernetes. K3s is particularly popular for IoT and CI/CD environments where a full Kubernetes setup would be overkill.
One common issue you might encounter when using K3s is the PodFailedToDelete error. This symptom manifests when a pod in your K3s cluster fails to delete, even after issuing a delete command. You might notice that the pod remains in a 'Terminating' state indefinitely.
When you attempt to delete a pod, it should transition from 'Running' to 'Terminating' and then disappear. However, with this issue, the pod remains stuck in the 'Terminating' state, indicating a problem with the deletion process.
The PodFailedToDelete issue often arises due to the presence of finalizers or resource cleanup problems. Finalizers are Kubernetes resources that ensure certain cleanup tasks are completed before the resource is fully deleted. If these finalizers are not removed or if they encounter issues, the pod cannot be deleted.
To resolve this issue, you need to identify and remove any problematic finalizers or force delete the pod if necessary. Follow these steps:
kubectl get pod <pod-name> -n <namespace> -o json | jq '.metadata.finalizers'
kubectl edit pod <pod-name> -n <namespace>
If the pod still does not delete, you can force delete it:
kubectl delete pod <pod-name> -n <namespace> --grace-period=0 --force
For more information on handling Kubernetes finalizers, you can refer to the Kubernetes Finalizers Documentation. Additionally, the K3s Documentation provides further insights into managing K3s clusters effectively.
(Perfect for DevOps & SREs)
(Perfect for DevOps & SREs)
