Before configuring Glance to use the Ceph RBD backend, we need to make sure that the Database, message broker, and Keystone are set for Glance, and both
glance-registry.conf are configured correctly to use them. We also need to make sure that a Ceph volume with a corresponding pool for glance was created, and the
key.ring files were preconfigured.
[root@controller ~]# yum install -y python-cephfs