Enable Cinder back end for Glance

Available since MOS 21.4 TechPreview

Note

Consider this section as part of Deploy an OpenStack cluster.

This section instructs you on how to configure Cinder back end for the for images through the OpenStackDeployment CR.

Note

This feature depends heavily on Cinder multi-attach, which enables you to simultaneously attach volumes to multiple instances. Therefore, only the block storage back ends that support multi-attach can be used.

To configure a Cinder back end for Glance, define the back end identity in the OpenStackDeployment CR. This identity will be used as a name for the back end section in the Glance configuration file.

When defining the back end:

  • Configure one of the back ends as default.

  • Configure each back end to use specific Cinder volume type.

    Note

    You can use the volume_type parameter instead of backend_name. If so, you have to create this volume type beforehand and take into account that the bootstrap script does not manage such volume types.

The blockstore identity definition example:

spec:
  features:
    glance:
      backends:
        cinder:
          blockstore:
            default: true
            backend_name: <volume_type:volume_name>
            # e.g. backend_name: lvm:lvm_store

spec:
  features:
    glance:
      backends:
        cinder:
          blockstore:
            default: true
            volume_type: netapp