7.3. Enabling sparse image upload

Procedure

1. Open your OpenStackControlPlane CR file, openstack_control_plane.yaml, and add the following parameters to the glance template. Enable sparse image upload by setting the rbd_thin_provisioning parameter to True:

   apiVersion: core.openstack.org/v1beta1
   kind: OpenStackControlPlane
   spec:
       ...
     glance:
       template:
         databaseInstance: openstack
         databaseUser: glance
         customServiceConfig: |
           [DEFAULT]
           enabled_backends = <backend_name>:rbd
           enabled_import_methods=[web-download]
           [glance_store]
           default_backend = <backend_name>
           [<backend_name>]
           rbd_store_ceph_conf = /etc/ceph/ceph.conf
           store_description = "RBD backend"
           rbd_store_pool = images
           rbd_store_user = openstack
           rbd_thin_provisioning = True
     ...

   • Replace <backend_name> with the name of the default back end.

2. Update the control plane:

   $ oc apply -f openstack_control_plane.yaml -n openstack

3. Wait until RHOCP creates the resources related to the OpenStackControlPlane CR. Run the following command to check the status:

   $ oc get openstackcontrolplane -n openstack

   The OpenStackControlPlane resources are created when the status is "Setup complete".

   提示

   Append the -w option to the end of the get command to track deployment progress.

1. Download the image file locally:

   $ wget <file_location>/<file_name>

   • Replace <file_location> with the location of the file.

   • Replace <file_name> with the name of the file.

     For example:

     $ wget https://cloud.centos.org/centos/6/images/CentOS-6-x86_64-GenericCloud-1508.qcow2

2. Check the disk size and the virtual size of the image to be uploaded:

   $ qemu-img info <file_name>

   For example:

   $ qemu-img info CentOS-6-x86_64-GenericCloud-1508.qcow2
   
   image: CentOS-6-x86_64-GenericCloud-1508.qcow2
   file format: qcow2
   virtual size: 8 GiB (8589934592 bytes)
   disk size: 1.09 GiB
   cluster_size: 65536
   Format specific information:
   compat: 0.10
   refcount bits: 1

3. Import the image:

   $ glance image-create-via-import --disk-format qcow2 --container-format bare --name centos_1 --file <file_name>

4. Record the image ID. It is required in a subsequent step.

5. Verify that the image is imported and in an active state:

   • Access the remote shell for the OpenStackClient pod from your workstation:

     $ oc rsh -n openstack openstackclient

   • View the image:

     $ openstack image show <image_id>

   • Exit the openstackclient pod:

     $ exit

6. From a Ceph Storage node, verify that the size of the image is less than the virtual size from the output of step 2:

   $ sudo rbd -p images diff <image_id> | awk '{ SUM += $2 } END { print SUM/1024/1024/1024 " GB" }'
   
   1.03906 GB