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Chapter 10. Updating the Registry with Container-Native Storage as the Storage Back-end

OpenShift Container Platform provides an integrated registry with storage using an NFS-backed persistent volume that is automatically setup. Container-Native Storage allows you to replace this with a Gluster persistent volume for registry storage. This provides increased reliability, scalability and failover. For additional information about OpenShift Container Platform and the docker-registry, refer to https://access.redhat.com/documentation/en-us/openshift_container_platform/3.5/html-single/installation_and_configuration/#setting-up-the-registry .
To include Container-Native Storage volume as a back-end when installing Openshift Container Platform, refer https://access.redhat.com/documentation/en-us/openshift_container_platform/3.6/html-single/installation_and_configuration/#advanced-install-containerized-glusterfs-backed-registry.

10.1. Validating the Openshift Container Platform Registry Deployment
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To verify that the registry is properly deployed, execute the following commands:
  1. On the master or client, execute the following command to login as the cluster admin user: 
    # oc login
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    For example: 
    # oc login

Authentication required for https://master.example.com:8443 (openshift)
Username: <cluster-admin-user>
Password: <password>
Login successful.

You have access to the following projects and can switch between them with 'oc project <projectname>':

  * default 
    management-infra
    openshift
    openshift-infra

Using project "default".
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    If you are not automatically logged into project default, then switch to it by executing the following command: 
    # oc project default
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  2. To verify that the pod is created, execute the following command: 
    # oc get pods
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    For example: 
    # oc get pods
NAME                       READY     STATUS    RESTARTS   AGE
docker-registry-2-mbu0u    1/1       Running   4          6d
docker-registry-2-spw0o    1/1       Running   3          6d
registry-console-1-rblwo   1/1       Running   3          6d
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  3. To verify that the endpoints are created, execute the following command: 
    # oc get endpoints
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    For example: 
    # oc get endpoints
NAME               ENDPOINTS                                                                  AGE
docker-registry    10.128.0.15:5000,10.129.0.9:5000                                           7d
kubernetes         192.168.234.143:8443,192.168.234.143:8053,192.168.234.143:8053             7d
registry-console   10.128.0.17:9090                                                           7d
router             192.168.234.144:443,192.168.234.145:443,192.168.234.144:1936 + 3 more...   7d
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  4. To verify that the persistent volume is created, execute the following command: 
    # oc get pv
NAME   CAPACITY   ACCESSMODES   RECLAIMPOLICY   STATUS      CLAIM  REASON    AGE
registry-volume           5Gi        RWX           Retain          Bound       default/registry-claim             7d
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  5. To obtain the details of the persistent volume that was created for the NFS registry, execute the following command: 
    # oc describe pv registry-volume
Name:        registry-volume
Labels:        <none>
StorageClass:    
Status:        Bound
Claim:        default/registry-claim
Reclaim Policy:    Retain
Access Modes:    RWX
Capacity:    5Gi
Message:    
Source:
    Type:    NFS (an NFS mount that lasts the lifetime of a pod)
    Server:    cns30.rh73
    Path:    /exports/registry
    ReadOnly:    false
No events.
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