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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.