Configuring the registry for bare metal

Image registry removed during installation

On platforms that do not provide shareable object storage, the OpenShift Image Registry Operator bootstraps itself as Removed. This allows openshift-installer to complete installations on these platform types.

After installation, you must edit the Image Registry Operator configuration to switch the managementState from Removed to Managed.

Changing the image registry’s management state

To start the image registry, you must change the Image Registry Operator configuration’s managementState from Removed to Managed.

Procedure

• Change managementState Image Registry Operator configuration from Removed to Managed. For example:

  $ oc patch configs.imageregistry.operator.openshift.io cluster --type merge --patch '{"spec":{"managementState":"Managed"}}'

Image registry storage configuration

The Image Registry Operator is not initially available for platforms that do not provide default storage. After installation, you must configure your registry to use storage so that the Registry Operator is made available.

Instructions are shown for configuring a persistent volume, which is required for production clusters. Where applicable, instructions are shown for configuring an empty directory as the storage location, which is available for only non-production clusters.

Additional instructions are provided for allowing the image registry to use block storage types by using the Recreate rollout strategy during upgrades.

Configuring registry storage for bare metal and other manual installations

As a cluster administrator, following installation you must configure your registry to use storage.

Prerequisites

• Cluster administrator permissions.

• A cluster that uses manually-provisioned Fedora CoreOS (FCOS) nodes, such as bare metal.

• Persistent storage provisioned for your cluster, such as Red Hat OpenShift Container Storage.

  OKD supports ReadWriteOnce access for image registry storage when you have only one replica. To deploy an image registry that supports high availability with two or more replicas, ReadWriteMany access is required.

• Must have 100Gi capacity.

Procedure

1. To configure your registry to use storage, change the spec.storage.pvc in the configs.imageregistry/cluster resource.

   When using shared storage, review your security settings to prevent outside access.

2. Verify that you do not have a registry pod:

   $ oc get pod -n openshift-image-registry

   If the storage type is emptyDIR, the replica number cannot be greater than 1.

3. Check the registry configuration:

   $ oc edit configs.imageregistry.operator.openshift.io

   Example output

   storage:
     pvc:
       claim:

   Leave the claim field blank to allow the automatic creation of an image-registry-storage PVC.

4. Check the clusteroperator status:

   $ oc get clusteroperator image-registry

5. Ensure that your registry is set to managed to enable building and pushing of images.

   • Run:

     $ oc edit configs.imageregistry/cluster

     Then, change the line

     managementState: Removed

     to

     managementState: Managed

Configuring storage for the image registry in non-production clusters

You must configure storage for the Image Registry Operator. For non-production clusters, you can set the image registry to an empty directory. If you do so, all images are lost if you restart the registry.

Procedure

• To set the image registry storage to an empty directory:

  $ oc patch configs.imageregistry.operator.openshift.io cluster --type merge --patch '{"spec":{"storage":{"emptyDir":{}}}}'

  Configure this option for only non-production clusters.

  If you run this command before the Image Registry Operator initializes its components, the oc patch command fails with the following error:

  Error from server (NotFound): configs.imageregistry.operator.openshift.io "cluster" not found

  Wait a few minutes and run the command again.

Configuring block registry storage

To allow the image registry to use block storage types during upgrades as a cluster administrator, you can use the Recreate rollout strategy.

Procedure

1. To set the image registry storage as a block storage type, patch the registry so that it uses the Recreate rollout strategy and runs with only one (1) replica:

   $ oc patch config.imageregistry.operator.openshift.io/cluster --type=merge -p '{"spec":{"rolloutStrategy":"Recreate","replicas":1}}'

2. Provision the PV for the block storage device, and create a PVC for that volume. The requested block volume uses the ReadWriteOnce (RWO) access mode.

3. Edit the registry configuration so that it references the correct PVC.

Additional resources

For more details about configuring registry storage for bare metal, see Recommended configurable storage technology.