Chapter 1. Deploying OpenShift Container Storage on Red Hat OpenStack Platform

Deploying OpenShift Container Storage on OpenShift Container Platform using dynamic storage devices provided by Red Hat OpenStack Platform installer-provisioned infrastructure (IPI) enables you to create internal cluster resources. This results in internal provisioning of the base services, which helps to make additional storage classes available to applications.

  1. For Red Hat Enterprise Linux based hosts for worker nodes, enable the container access to the underlying file system. Follow the instructions on enabling file system access for containers on Red Hat Enterprise Linux based nodes.

    Note

    Skip this step for Red Hat Enterprise Linux CoreOS (RHCOS).

  2. Install the Red Hat OpenShift Container Storage Operator.
  3. Create the OpenShift Container Storage Cluster Service

1.1. Installing Red Hat OpenShift Container Storage Operator

You can install Red Hat OpenShift Container Storage Operator using the Red Hat OpenShift Container Platform Operator Hub. For information about the hardware and software requirements, see Planning your deployment.

Prerequisites

  • You must be logged into the OpenShift Container Platform cluster.
  • You must have at least three worker nodes in the OpenShift Container Platform cluster.
Note

When you need to override the cluster-wide default node selector for OpenShift Container Storage, you can use the following command in command line interface to specify a blank node selector for the openshift-storage namespace:

$ oc annotate namespace openshift-storage openshift.io/node-selector=

Procedure

  1. Click Operators → OperatorHub in the left pane of the OpenShift Web Console.

    Figure 1.1. List of operators in the Operator Hub

    Screenshot of list of operators in the Operator Hub of the OpenShift Web Console.
  2. Click on OpenShift Container Storage.

    You can use the Filter by keyword text box or the filter list to search for OpenShift Container Storage from the list of operators.

  3. On the OpenShift Container Storage operator page, click Install.
  4. On the Install Operator page, ensure the following options are selected:

    1. Update Channel as stable-4.5
    2. Installation Mode as A specific namespace on the cluster
    3. Installed Namespace as Operator recommended namespace PR openshift-storage. If Namespace openshift-storage does not exist, it will be created during the operator installation.
    4. Select Approval Strategy as Automatic or Manual. Approval Strategy is set to Automatic by default.

      • Approval Strategy as Automatic.

        Note

        When you select the Approval Strategy as Automatic, approval is not required either during fresh installation or when updating to the latest version of OpenShift Container Storage.

        1. Click Install
        2. Wait for the install to initiate. This may take up to 20 minutes.
        3. Click Operators → Installed Operators
        4. Ensure the Project is openshift-storage. By default, the Project is openshift-storage.
        5. Wait for the Status of OpenShift Container Storage to change to Succeeded.
      • Approval Strategy as Manual.

        Note

        When you select the Approval Strategy as Manual, approval is required during fresh installation or when updating to the latest version of OpenShift Container Storage.

        1. Click Install.
        2. On the Installed Operators page, click ocs-operator.
        3. On the Subscription Details page, click the Install Plan link.
        4. On the InstallPlan Details page, click Preview Install Plan.
        5. Review the install plan and click Approve.
        6. Wait for the Status of the Components to change from Unknown to either Created or Present.
        7. Click Operators → Installed Operators
        8. Ensure the Project is openshift-storage. By default, the Project is openshift-storage.
        9. Wait for the Status of OpenShift Container Storage to change to Succeeded.

Verification steps

  • Verify that OpenShift Container Storage Operator shows the Status as Succeeded on the Installed Operators dashboard.

1.2. Creating an OpenShift Container Storage Cluster Service in internal mode

Use this procedure to create an OpenShift Container Storage Cluster Service after you install the OpenShift Container Storage operator.

Prerequisites

Procedure

  1. Click Operators → Installed Operators from the OpenShift Web Console to view the installed operators. Ensure that the Project selected is openshift-storage.
  2. On the Installed Operators page, click Openshift Container Storage.

    Figure 1.2. OpenShift Container Storage Operator page

    Screenshot of OpenShift Container Storage operator dashboard.
  3. On the Installed Operators → Operator Details page, perform either of the following to create a Storage Cluster Service.

    1. On the Details tab → Provided APIs → OCS Storage Cluster, click Create Instance.

      Figure 1.3. Operator Details Page

      Screenshot of Operator Details Page.
    2. Alternatively, select the Storage cluster tab and click Create OCS Cluster Service.

      Figure 1.4. Storage Cluster tab

      Screenshot of Storage Cluster tab on OpenShift Container Storage Operator dashboard.
  4. On the Create Storage Cluster page, ensure that the following options are selected:

    Figure 1.5. Create Storage Cluster page

    Screenshot of Create Cluster Service page where you can select mode of deployment.
    1. By default, Select Mode has Internal selected.
    2. In the Nodes section, for the use of OpenShift Container Storage service, select a minimum of three or a multiple of three worker nodes from the available list.

      For cloud platforms with multiple availability zones, ensure that the Nodes are spread across different Locations/availability zones.

      Note

      To find specific worker nodes in the cluster, you can filter nodes on the basis of Name or Label.

      • Name allows you to search by name of the node
      • Label allows you to search by selecting the predefined label

      For minimum starting node requirements, see Resource requirements section in Planning guide.

    3. Storage Class is set by default to standard for Red Hat OpenStack Platform.
    4. Select OCS Service Capacity from drop down list.

      Note

      Once you select the initial storage capacity, cluster expansion will only be performed using the selected usable capacity (times 3 of raw storage).

  5. Click Create.

    Note

    The Create button is enabled only after selecting a minimum of three worker nodes.

    Upon successful deployment, a storage cluster with three storage devices gets created. These devices get distributed across three of the selected nodes. The configuration uses a replication factor of 3. To scale the initial cluster, see Scaling storage nodes.

Verification steps