Ceph pools for Cinder multi-backend

The CephDeployment custom resource (CR) supports multiple Ceph pools with the volumes role to configure Cinder multiple backends in Rockoon OpenStack.

Configure Ceph pools for Cinder multiple backends

1. In the CephDeployment CR, add the desired number of Ceph pools to the pools section with the volumes role:

   kubectl -n ceph-lcm-mirantis edit miraceph
   

   Example configuration:

   spec:
     pools:
     - default: false
       deviceClass: hdd
       name: volumes
       replicated:
         size: 3
       role: volumes
     - default: false
       deviceClass: hdd
       name: volumes-backend-1
       replicated:
         size: 3
       role: volumes
     - default: false
       deviceClass: hdd
       name: volumes-backend-2
       replicated:
         size: 3
       role: volumes
   

2. Verify that Cinder backend pools are created and ready:

   kubectl -n pelagia get cephdeploymenthealth -o yaml
   

   Example output:

   status:
     healthReport:
       rookCephObjects:
         blockStorage:
           cephBlockPools:
             volumes-hdd:
               info:
                 failureDomain: host
                 type: Replicated
               observedGeneration: 1
               phase: Ready
               poolID: 12
             volumes-backend-1-hdd:
               info:
                 failureDomain: host
                 type: Replicated
               observedGeneration: 1
               phase: Ready
               poolID: 13
             volumes-backend-2-hdd:
               info:
                 failureDomain: host
                 type: Replicated
               observedGeneration: 1
               phase: Ready
               poolID: 14
   

3. Verify that the added Ceph pools are accessible from the Cinder service. For example:

   kubectl -n openstack exec -it cinder-volume-0 -- rbd ls -p volumes-backend-1-hdd -n client.cinder
   kubectl -n openstack exec -it cinder-volume-0 -- rbd ls -p volumes-backend-2-hdd -n client.cinder
   

After Ceph pools become available, Rockoon will automatically specify them as an additional Cinder backend and register as a new volume type, which you can use to create Cinder volumes.