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Ceph pools for Cinder multi-backend

Available since MOSK 23.2

The KaaSCephCluster object supports multiple Ceph pools with the volumes role to configure Cinder multiple backends.

To define Ceph pools for Cinder multiple backends:

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

   kubectl -n <MOSKClusterProject> edit kaascephcluster
   

   Substitute <MOSKClusterProject> with corresponding namespace of the MOSK cluster.

   Example configuration:

   spec:
     cephClusterSpec:
       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 <managedClusterProject> get kaascephcluster -o yaml
   

   Example output:

   status:
     fullClusterStatus:
       blockStorageStatus:
         poolsStatus:
           volumes-hdd:
             present: true
             status:
               observedGeneration: 1
               phase: Ready
           volumes-backend-1-hdd:
             present: true
             status:
               observedGeneration: 1
               phase: Ready
           volumes-backend-2-hdd:
             present: true
             status:
               observedGeneration: 1
               phase: Ready
   

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 the Ceph pool becomes available, it is automatically specified as an additional Cinder backend and registered as a new volume type, which you can use to create Cinder volumes.