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Configuring the registry for OpenStack

You configure the image registry to use custom storage on clusters that run on OpenStack. You must configure custom storage to use a Cinder volume in a specific availability zone.

Configuring an image registry with custom storage on clusters that run on OpenStack

After you install a cluster on OpenStack, you can use a Cinder volume that is in a specific availability zone for registry storage.

Procedure

  1. Create a YAML file that specifies the storage class and availability zone to use. For example:

    apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: custom-csi-storageclass
provisioner: cinder.csi.openstack.org
volumeBindingMode: WaitForFirstConsumer
allowVolumeExpansion: true
parameters:
  availability: <availability_zone_name>

    OKD does not verify the existence of the availability zone you choose. Verify the name of the availability zone before you apply the configuration.

  2. From a command line, apply the configuration:

    $ oc apply -f <storage_class_file_name>
    Example output
    storageclass.storage.k8s.io/custom-csi-storageclass created

  3. Create a YAML file that specifies a persistent volume claim (PVC) that uses your storage class and the openshift-image-registry namespace. For example:

    apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: csi-pvc-imageregistry
  namespace: openshift-image-registry
  annotations:
    imageregistry.openshift.io: "true"
spec:
  accessModes:
  - ReadWriteOnce
  volumeMode: Filesystem
  resources:
    requests:
      storage: 100Gi
  storageClassName: <your_custom_storage_class>

    where:

    openshift-image-registry

    Specifying this namespace allows the Cluster Image Registry Operator to consume the PVC.

    storage

    This optional field adjusts the volume size.

    storageClassName

    Specifies the name of the storage class that you created.

  4. From a command line, apply the configuration:

    $ oc apply -f <pvc_file_name>
    Example output
    persistentvolumeclaim/csi-pvc-imageregistry created

  5. Replace the original persistent volume claim in the image registry configuration with the new claim:

    $ oc patch configs.imageregistry.operator.openshift.io/cluster --type 'json' -p='[{"op": "replace", "path": "/spec/storage/pvc/claim", "value": "csi-pvc-imageregistry"}]'
    Example output
    config.imageregistry.operator.openshift.io/cluster patched

    Over the next several minutes, the configuration is updated.

Verification

To confirm that the registry is using the resources that you defined:

  1. Verify that the PVC claim value is identical to the name that you provided in your PVC definition:

    $ oc get configs.imageregistry.operator.openshift.io/cluster -o yaml
    Example output
    ...
status:
    ...
    managementState: Managed
    pvc:
      claim: csi-pvc-imageregistry
...

  2. Verify that the status of the PVC is Bound:

    $ oc get pvc -n openshift-image-registry csi-pvc-imageregistry
    Example output
    NAME                   STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS             AGE
csi-pvc-imageregistry  Bound    pvc-72a8f9c9-f462-11e8-b6b6-fa163e18b7b5   100Gi      RWO            custom-csi-storageclass  11m