Here: https://github.com/ceph/ceph/tree/master/src/tools/rbd_nbd

My question is: Can we use this rbd-nbd tool in the Ceph cluster? By Ceph cluster I mean the development cluster we build through vstart.sh script.  I am quite sure we could use it. I have this script running. I can start and stop the cluster. But I am struggling to use this rbd-nbd tool in the development cluster which we build through vstart.sh script.