Overview

Learn how to resolve the issue when delete namespace gets stuck in Raspberry PI 4 k3s Kubernetes. Kubernetes Namespaces have Finalizers, which is a feature that prevents resources from being hard deleted. For example, this occurs when you try to hard delete a running Namespace such as monitoring with kubectl delete ns monitoring, and the Namespace you attempted to delete will remain stuck in a Terminating state.

$ sudo kubectl get namespace
NAME                   STATUS        AGE
default                Active        2d22h
kube-system            Active        2d22h
kube-public            Active        2d22h
kube-node-lease        Active        2d22h
kubernetes-dashboard   Active        2d21h
monitoring             Terminating   6m51s

How?

NameSpace Edit

Extract the information about the monitoring namespace to tmp.json using the command below.

$ sudo kubectl get ns monitoring -o json > tmp.json

Then open tmp.json and modify the finalizers under spec to an empty array as shown below.

"spec": {
"finalizers": []
}

apply

Open a new terminal and start a kubectl proxy server.

$ sudo kubectl proxy

Apply the modified tmp.json to the namespace using the curl command below.

$ curl -k -H "Content-Type: application/json" -X PUT --data-binary   @tmp.json http://127.0.0.1:8001/api/v1/namespaces/monitoring/finalize

Result

If you check the namespaces with the command below, you can confirm that the monitoring namespace has been successfully deleted.

$ sudo kubectl get ns
NAME                   STATUS   AGE
default                Active   2d22h
kube-system            Active   2d22h
kube-public            Active   2d22h
kube-node-lease        Active   2d22h
kubernetes-dashboard   Active   2d21hgit

Reference

https://computingforgeeks.com/how-to-force-delete-a-kubernetes-namespace/