Chapter 1. Deploying using local storage devices

1. Log in to the Red Hat Enterprise Linux based node and open a terminal.

2. Verify that the node has access to the rhel-7-server-extras-rpms repository.

   # subscription-manager repos --list-enabled | grep rhel-7-server

   If you do not see both rhel-7-server-rpms and rhel-7-server-extras-rpms in the output, or if there is no output, run the following commands to enable each repository.

   # subscription-manager repos --enable=rhel-7-server-rpms
   # subscription-manager repos --enable=rhel-7-server-extras-rpms

3. Install the required packages.

   # yum install -y policycoreutils container-selinux

4. Persistently enable container use of the Ceph file system in SELinux.

   # setsebool -P container_use_cephfs on

Procedure

1. Click Operators → OperatorHub in the left pane of the OpenShift Web Console.
2. Use Filter by keyword text box or the filter list to search for OpenShift Container Storage from the list of operators.
3. Click OpenShift Container Storage.
4. On the OpenShift Container Storage operator page, click Install.

5. On the Install Operator page, ensure the following options are selected by default::

   1. Update Channel as stable-4.6
   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 Enable operator recommended cluster monitoring on this namespace checkbox as this is required for cluster monitoring.

   5. 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 Manual approval required page, you can either click Approve or View Installed Operators in namespace openshift-storage to install the operator.

           Important

           Before you click either of the options, wait for a few minutes on the Manual approval required page until the install plan gets loaded in the window.

           Important

           If you choose to click Approve, you must review the install plan before you proceed.

           • If you click Approve.

             • Wait for a few minutes while the OpenShift Container Storage Operator is getting installed.
             • On the Installed operator - ready for use page, click View Operator.
             • Ensure the Project is openshift-storage. By default, the Project is openshift-storage.
             • Click Operators → Installed Operators
             • Wait for the Status of OpenShift Container Storage to change to Succeeded.

           • If you click View Installed Operators in namespace openshift-storage .

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

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.

   Figure 1.1. Install Operator page

   

5. Set the following options on the Install Operator page:

   1. Update Channel as 4.6
   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.

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.

   Figure 1.2. OpenShift Container Storage Operator page

   

3. Click OpenShift Container Storage.

   Figure 1.3. Details tab of OpenShift Container Storage

   

4. Click Create Instance link of Storage Cluster.

   Figure 1.4. Create Storage Cluster page

   
5. Select Internal-Attached devices for the Select Mode. By default, Internal is selected.

6. Create a storage cluster using the wizard that includes disk discovery, storage class creation, and storage cluster creation.

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

   Discover disks

   You can discover a list of potentially usable disks on the selected nodes. Block disks and partitions that are not in use and available for provisioning persistent volumes (PVs) are discovered.

   Figure 1.5. Discovery Disks wizard page

   

   1. Choose one of the following:

      • All nodes to discover disks in all the nodes.

      • Select nodes to discover disks from a subset of the listed nodes.

        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 and Label allows you to search by selecting the predefined label.

        If the nodes selected do not match the OpenShift Container Storage cluster requirement of an aggregated 30 CPUs and 72 GiB of RAM, a minimal cluster will be deployed. For minimum starting node requirements, see Resource requirements section in Planning 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.

   2. Click Next.

   Create Storage Class

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

   Figure 1.6. Create Storage Class wizard page

   

   1. Enter the Volume Set Name.
   2. Enter the Storage Class Name. By default, the volume set name appears for the storage class name.

   3. The nodes selected for disk discovery in the earlier 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.

        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 and Label allows you to search by selecting the predefined label.

        It is recommended that the worker nodes are spread across three different physical nodes, racks or failure domains for high availability.

        Note

        Ensure OpenShift Container Storage rack labels are aligned with physical racks in the datacenter to prevent a double node failure at the failure domain level.

   4. Select the required Disk Type. The following options are available:

      All	Selects all types of disks present on the nodes. By default, this option is selected.
      SSD/NVME	Selects only SSD NVME type of disks.
      HDD	Selects only HDD type of disks.

   5. In the Advanced section, you can set the following:

      Disk Mode	Block is selected by default.
      Disk Size	Minimum and maximum avaialable size of the device that needs to be included. Note You must set a minimum size of 100GB for the device.
      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. (Optional) You can view the selected capacity of the disks on the selected nodes using the Select Capacity chart.

      This chart might take a few minutes to reflect the disks that are discovered in the previous step.

      You can click on the Nodes and Disks links on the chart to bring up the list of nodes and disks to view more details.

      Figure 1.7. List of selected nodes

      

      Figure 1.8. List of selected disks

      
   7. Click Next.

   8. Click Yes in the message alert to confirm the creation of the storage class.

      After the local volume set and storage class are created, it is not possible to go back to the step.

   Create Storage Cluster

   Figure 1.9. Create Storage Cluster wizard page

   

   1. Select the required storage class.

      You might need to wait a couple of minutes for the storage nodes corresponding to the selected storage class to get populated.

   2. (Optional) In the Encryption section, set the toggle to Enabled to enable data encryption on the cluster.
   3. The nodes corresponding to the storage class are displayed based on the storage class that you selected from the drop down list.

   4. Click Create.

      The Create button is enabled only when a minimum of three nodes are selected. A new storage cluster of three volumes will be created with one volume per worker node. The default configuration uses a replication factor of 3.

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.

   Figure 1.10. OpenShift Container Storage Operator page

   

3. Click OpenShift Container Storage.

   Figure 1.11. Details tab of OpenShift Container Storage

   

4. Click Create Instance link of Storage Cluster.

   Figure 1.12. Create Storage Cluster page

   

5. Select Internal-Attached devices for the Select Mode. By default, Internal is selected.

   Figure 1.13. Create Storage Cluster page

   
6. (Optional) In the Encryption section, set the toggle to Enabled to enable data encryption on the cluster.

7. The nodes corresponding to the selected storage class are displayed.

   The selected nodes are labeled with cluster.ocs.openshift.io/openshift-storage=’’ if they are not already labeled. Three of the selected nodes are used for initial deployment and the remaining nodes are used as the scheduling targets for OpenShift Container Storage scaling.

8. Click Create.

   The Create button is enabled only when a minimum of three nodes are selected.

   A new storage cluster of three volumes will be created with one volume per worker node. The default configuration uses a replication factor of 3.