[k8s] Cannot remove model and cluster after trying to manage a cluster with a non-reachable controller

[Peter Matulis]

I tried, perhaps foolishly, to manage a remote GKE cluster with a local LXD controller. Charm deployment failed and I realised my mistake (i.e. the cluster nodes cannot initiate TCP connections with the controller). The real problem is that I cannot remove the model, even with the new `--force` option. I then could not remove the cluster from the controller due to the existing model. I had to wipe out the entire controller, which is very unfortunate.

https://paste.ubuntu.com/p/GHMK99gDzY/

[Peter Matulis (petermatulis)]

A K8s namespace gets left behind in the cluster. This means the model name cannot be reused unless the operator knows how to remove the namespace:

$ kubectl delete namespace turbo