Chapter 3. Backing OpenShift Container Platform applications with OpenShift Container Storage

You cannot directly install OpenShift Container Storage during the OpenShift Container Platform installation. However, you can install OpenShift Container Storage on an existing OpenShift Container Platform by using the Operator Hub and then configure the OpenShift Container Platform applications to be backed by OpenShift Container Storage.

Prerequisites

  • OpenShift Container Platform is installed and you have administrative access to OpenShift Web Console.
  • OpenShift Container Storage is installed and running in the openshift-storage namespace.

Procedure

  1. In the OpenShift Web Console, perform one of the following:

    • Click Workloads → Deployments.

      In the Deployments page, you can do one of the following:

      • Select any existing deployment and click Add Storage option from the Action menu (⋮).
      • Create a new deployment and then add storage.

        1. Click Create Deployment to create a new deployment.
        2. Edit the YAML based on your requirement to create a deployment.
        3. Click Create.
        4. Select Add Storage from the Actions drop down menu on the top right of the page.
    • Click Workloads → Deployment Configs.

      In the Deployment Configs page, you can do one of the following:

      • Select any existing deployment and click Add Storage option from the Action menu (⋮).
      • Create a new deployment and then add storage.

        1. Click Create Deployment Config to create a new deployment.
        2. Edit the YAML based on your requirement to create a deployment.
        3. Click Create.
        4. Select Add Storage from the Actions drop down menu on the top right of the page.
  2. In the Add Storage page, you can choose one of the following options:

    • Click the Use existing claim option and select a suitable PVC from the drop down list.
    • Click the Create new claim option.

      1. Select ocs-storagecluster-ceph-rbd or ocs-storagecluster-cephfs storage class from the Storage Class drop down list.
      2. Provide a name for the Persistent Volume Claim.
      3. Select ReadWriteOnce (RWO) or ReadWriteMany (RWX) access mode.

        Note

        ReadOnlyMany (ROX) is deactivated as it is not supported.

      4. Select the size of the desired storage capacity.

        Note

        You cannot resize the storage capacity after the creation of Persistent Volume Claim.

  3. Specify the mount path and subpath (if required) for the mount path volume inside the container.
  4. Click Save.

Verification steps

  1. Depending on your configuration, perform one of the following:

    • Click Workloads → Deployments.
    • Click Workloads → Deployment Configs.
  2. Set the Project as required.
  3. Click the deployment for you which you added storage to view the deployment details.
  4. Scroll down to Volumes and verify that your deployment has a Type that matches the Persistent Volume Claim that you assigned.
  5. Click the Persistent Volume Claim name and verify the storage class name in the PersistenVolumeClaim Overview page.