I'm trying to connect my k8s cluster to my ceph cluster with this manual: https://akomljen.com/using-existing-ceph-cluster-for-kubernetes-persistent-storage/
I want to deploy rbd-provision pods into kube-system namespace like this https://paste.ee/p/C1pB4
After deploying pvc I get errors because my pvc is in default namespace. Can I do with that anything? I read docs and if I'm right I can't use ServiceAccount with 2 ns, or can?
No. Service account is namespaced object and it is limited to particular namespace only
Service accounts can be granted permissions in another namespace.
For example, within the namespace "acme", grant the permissions in the view ClusterRole to the service account in the namespace "acme" named "myapp" :
kubectl create rolebinding myapp-view-binding \
--clusterrole=view --serviceaccount=acme:myapp \
--namespace=acme