Create PV from existing folder on CephFS

[pschichtel]

Hi everyone!

I have a rook-managed cephfs in my homelab that hosts a rather large (large enough that I wouldn't want to duplicate it) music library, which I access directly from PCs in the network. Now I want make this cephfs folder available to a container in k8s for music streaming.

I assume this is possible, but I haven't been able to find clear documentation detailing how. My intuition tells me that I probably just need to manually create a PV and matching PVC to be able to get it mounted into containers. I've looked at PVs that have been created by the CephFS CSI, when dynamically provisioning from a PVC. These PVs have a bunch of volumeAttributes which reference subvolumes.

Can anyone tell me what I'd need to configure in a PV to use an existing folder on a cephfs? Would I possibly need different credentials compared to those created by rook for the CSI?

[iPraveenParihar]

@pschichtel, CephFS Static PVC is what would must be looking. We have a good document on how to create static PVC for CephFS & RBD - cephfs-static-pvc.

[pschichtel]

@iPraveenParihar thanks for the link, that's exactly what I was looking for. I'm currently facing the problem described at https://github.com/ceph/ceph-csi/blob/devel/docs/static-pvc.md#node-stage-secret-ref-in-cephfs-pv with the rook-generated rook-csi-cephfs-node secret. I guess I have to create my own user + secret, or do you if there is an option in rook to set this up automatically?

[pschichtel]

nvm, the provisioner doesn't have the right permissions anyway. makes sense to use a dedicated key pair, that way I can actually restrict where static volumes can be placed.