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Chapter 3. Deploy using local storage devices

Deploying OpenShift Container Storage on OpenShift Container Platform using local storage devices provides you with the option to create internal cluster resources. This will result in the internal provisioning of the base services, which helps to make additional storage classes available to applications.

Use this section to deploy OpenShift Container Storage on VMware where OpenShift Container Platform is already installed.

Also, ensure that you have addressed the requirements in Preparing to deploy OpenShift Container Storage chapter before proceeding with the next steps.

3.1. Installing Local Storage Operator

Procedure

  1. Log in to the OpenShift Web Console.
  2. Click Operators → OperatorHub.
  3. Search for Local Storage Operator from the list of operators and click on it.
  4. Click Install.
  5. Set the following options on the Install Operator page:

    1. Update Channel as stable-4.7
    2. Installation Mode as A specific namespace on the cluster.
    3. Installed Namespace as Operator recommended namespace openshift-local-storage.
    4. Approval Strategy as Automatic
  6. Click Install.
  7. Verify that the Local Storage Operator shows the Status as Succeeded.

3.2. 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.

Prerequisites

  • Access to an OpenShift Container Platform cluster using an account with cluster-admin and Operator installation permissions.
  • You have at least three worker nodes in the RHOCP cluster.
  • For additional resource requirements, see Planning your deployment.
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 (create openshift-storage namespace in this case):

    $ oc annotate namespace openshift-storage openshift.io/node-selector=
  • Taint a node as infra to ensure only Red Hat OpenShift Container Storage resources are scheduled on that node. This helps you save on subscription costs. For more information, see How to use dedicated worker nodes for Red Hat OpenShift Container Storage chapter in Managing and Allocating Storage Resources guide.

Procedure

  1. Navigate in the web console to the click Operators → OperatorHub.
  2. Scroll or type a keyword into the Filter by keyword box to search for OpenShift Container Storage Operator.
  3. Click Install on the OpenShift Container Storage operator page.
  4. On the Install Operator page, the following required options are selected by default:

    1. Update Channel as stable-4.7.
    2. Installation Mode as A specific namespace on the cluster.
    3. Installed Namespace as Operator recommended namespace 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.
    5. Click Install.

      If you selected Automatic updates, then the Operator Lifecycle Manager (OLM) automatically upgrades the running instance of your Operator without any intervention.

      If you selected Manual updates, then the OLM creates an update request. As a cluster administrator, you must then manually approve that update request to have the Operator updated to the new version.

Verification steps

Verify that the OpenShift Container Storage Operator shows a green tick indicating successful installation.

Next steps

3.3. Creating OpenShift Container Storage cluster on VMware

VMware supports the following three types of local storage:

  • Virtual machine disk (VMDK)
  • Raw device mapping (RDM)
  • VMDirectPath I/O

Prerequisites

Procedure

  1. Log into the OpenShift Web Console.
  2. Click Operators → Installed Operators to view all the installed operators.

    Ensure that the Project selected is openshift-storage.

  3. Click OpenShift Container Storage > Create Instance link of Storage Cluster.
  4. Choose Select Mode as Internal-Attached devices.

    Note

    You are prompted to install the Local Storage Operator if it is not already installed. Click Install and follows procedure as described in Installing Local Storage Operator.

  5. Discover disks

    1. Choose one of the following:

      • All nodes to discover disks in all the nodes.
      • Select nodes to discover disks from a subset of available nodes.

        Important

        For arbiter, do not select All nodes option. Instead, use Select nodes option to select the labeled nodes with attached storage device(s) from data-center zones.

    2. Click Next.
  6. Create Storage class.

    You can create a dedicated storage class to consume storage by filtering a set of storage volumes.

    1. Enter the Volume Set Name.
    2. Enter the Storage Class Name. By default, the volume set name appears for the storage class name. You can also change the name.
    3. The nodes selected for disk discovery in the previous step are displayed in the Filter Disks section. Choose one of the following:

      • All nodes to select all the nodes for which you discovered the devices.
      • Select nodes to select a subset of the nodes for which you discovered the devices. Spread the worker nodes across three different physical nodes, racks or failure domains for high availability.

        Important

        The flexible scaling feature gets enabled on creating a storage cluster with 3 or more nodes spread across fewer than the minimum requirement of 3 availability zones. This feature is available only for the new deployments of OpenShift Container Storage 4.7 clusters and does not support the upgraded clusters. For information about flexible scaling, see Scaling Storage Guide.

        Note

        If the nodes to be selected are tainted and not discovered in the wizard, follow the steps provided in the Red Hat Knowledgebase Solution as a workaround.

    4. Select SSD/NVME Disk Type from the available list.
    5. Expand the Advanced section and set the following options:

      Volume Mode

      Block is selected by default.

      Device Type

      Select one or more disk type from the drop down list.

      Disk Size

      Set a minimum size of 100GB for the device and maximum available size of the device that needs to be included.

      Max Disk Limit

      This indicates the maximum number of PVs that can be created on a node. If this field is left empty, then PVs are created for all the available disks on the matching nodes.

    6. Click Next. A pop-up to confirm creation of the new storage class is displayed.
    7. Click Yes to continue.
  7. Set Storage and nodes

    1. Select Storage Class. By default, the new storage class created in the previous step is selected.
    2. (Optional) Select Enable arbiter checkbox if you want to use the stretch clusters. This option is available only when all the prerequisites for arbiter are fulfilled and the Selected Nodes are populated. For more details, see Arbiter stretch cluster requirements [Technology Preview].

      • Select the arbiter zone from the available drop down list.
    3. Selected Nodes shows the nodes selected in the previous step. This list takes a few minutes to reflect the disks that were discovered in the previous step.
    4. Click Next.
  8. (Optional) Security configuration

    1. Select Enable encryption checkbox to encrypt block and file storage.
    2. Choose one of the following Encryption level:

      • Cluster-wide encryption to encrypt the entire cluster (block and file).
      • Storage class encryption to create encrypted persistent volume (block only) using encryption enabled storage class.

        Important

        Storage class encryption is a Technology Preview feature available only for RBD PVs. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process.

        For more information, see Technology Preview Features Support Scope.

    3. Select Connect to an external key management service checkbox. This is optional for cluster-wide encryption.

      1. Key Management Service Provider is set to Vault by default.
      2. Enter Vault Service Name, host Address of Vault server ('https://<hostname or ip>''), Port number and Token.
      3. Expand Advanced Settings to enter additional settings and certificate details based on your Vault configuration:

        1. Enter the Key Value secret path in Backend Path that is dedicated and unique to OpenShift Container Storage.
        2. Enter TLS Server Name and Vault Enterprise Namespace.
        3. Provide CA Certificate, Client Certificate and Client Private Key by uploading the respective PEM encoded certificate file.
        4. Click Save.
    4. Click Next.
  9. Review the configuration details. To modify any configuration settings, click Back to go back to the previous configuration page.
  10. Click Create.
  11. Edit the configmap if Vault Key/Value (KV) secret engine API, version 2 is used for cluster-wide encryption with Key Management System (KMS).

    1. On the OpenShift Web Console, navigate to Workloads → ConfigMaps.
    2. To view the KMS connection details, click ocs-kms-connection-details.
    3. Edit the configmap.

      1. Click Action menu (⋮) → Edit ConfigMap.
      2. Set the VAULT_BACKEND parameter to v2.

        kind: ConfigMap
        apiVersion: v1
        metadata:
          name: ocs-kms-connection-details
        [...]
        data:
          KMS_PROVIDER: vault
          KMS_SERVICE_NAME: vault
        [...]
          VAULT_BACKEND: v2
        [...]
      3. Click Save.

Verification steps

  • Verify that the final Status of the installed storage cluster shows as Phase: Ready with a green tick mark.

    • Click OperatorsInstalled OperatorsStorage Cluster link to view the storage cluster installation status.
    • Alternatively, when you are on the Operator Details tab, you can click on the Storage Cluster tab to view the status.
  • To verify if flexible scaling is enabled on your storage cluster, perform the following steps (for arbiter mode, flexible scaling is disabled):

    1. Click ocs-storagecluster in Storage Cluster tab.
    2. In the YAML tab, search for the keys flexibleScaling in spec section and failureDomain in status section. If flexible scaling is true and failureDomain is set to host, flexible scaling feature is enabled.

      spec:
      flexibleScaling: true
      […]
      status:
      failureDomain: host
  • For arbiter mode of deployment:

    1. Click ocs-storagecluster in Storage Cluster tab.
    2. In the YAML tab, search for the arbiter key in spec section and ensure 'enable' is set to 'true'.

      spec:
          arbiter:
            enable: true
          [..]
          nodeTopologies:
            arbiterLocation: arbiter #arbiter zone
          storageDeviceSets:
          - config: {}
            count: 1
              [..]
            replica: 4
      status:
          conditions:
          [..]
          failureDomain: zone
  • To verify that all components for OpenShift Container Storage are successfully installed, see Verifying your OpenShift Container Storage installation.

Additional resources

  • To expand the capacity of the initial cluster, see Scaling Storage guide.