Editing Rook Storage for Kubernetes (section)

==== RBD Storage Class ====
Next we create the StorageClass that kubernetes will use to request RBDs (block images) from the ceph cluster.  The starting point is the manifest '''''csi/rbd/storageclass.yaml''''' in the rook distribution.  Copy it to a local directory and customize it as described below.

The manifest creates two resources:  A CephPool resource that will be used to create a new pool (or use an existing pool) in the ceph cluster, and a StorageClass entry that will allow pods to request storage.  Customize this file as follows:
* change 'failureDomain' in the pool definition from 'host' to 'osd' ... this will enable replication within a host, which is necessary for a small cluster
* change the 'name' in the pool definition and the corresponding 'pool' in the storage class to something descriptive -- this will be the name of the pool that is created in the ceph cluster.
* set the namespace (if it isn't set already) to 'rook-ceph' to match whatever was used to create the cluster
When done, install the manifest:  

 kubectl create -f storageclass.yaml

At this point, the Storage Provisioner is ready.