Configure an External Netapp Deployment as the Storage Backend

Configure an external Netapp Trident deployment as the storage backend, after system installation using a StarlingX-provided ansible playbook.

Prerequisites

StarlingX must be installed and fully deployed before performing this procedure.

Procedure

  1. Configure the storage network.

    Follow the next steps to configure storage network

  2. If you have not done so already, create an address pool for the storage network. This can be done at any time.

    system addrpool-add --ranges <start_address>-<end_address> <name_of_address_pool> <network_address> <network_prefix>
    

    For example:

    (keystone_admin)$ system addrpool-add --ranges 10.10.20.1-10.10.20.100 storage-pool 10.10.20.0 24
    
  3. If you have not done so already, create the storage network using the address pool.

    For example:

    (keystone_admin)$ system addrpool-list | grep storage-pool | awk '{print$2}' | xargs system network-add storage-net storage true
    
  4. For each host in the system, do the following:

    1. Lock the host.

      (keystone_admin)$ system host-lock <hostname>
      
    2. Create an interface using the address pool.

      For example:

      (keystone_admin)$ system host-if-modify -n storage0 -c platform --ipv4-mode static --ipv4-pool storage-pool controller-0 enp0s9
      
    3. Assign the interface to the network.

      For example:

      (keystone_admin)$ system interface-network-assign controller-0 storage0 storage-net
      
    4. Unlock the system.

      (keystone_admin)$ system host-unlock <hostname>
      
  5. Configure Netapps configurable parameters and run the provided install_netapp_backend.yml ansible playbook to enable connectivity to Netapp as a storage backend for StarlingX.

  6. Provide Netapp backend configurable parameters in an overrides yaml file.

    You can make changes-in-place to your existing localhost.yml file or create another in an alternative location. In either case, you also have the option of using an ansible vault named secrets.yml for sensitive data. The alternative must be named localhost.yaml.

    The following parameters are mandatory:

    ansible_become_pass

    Provide the admin password.

    netapp_backends

    name A name for the storage class.

    provisioner

    This value must be netapp.io/trident.

    backendType

    This value can be anything but must be the same as StorageDriverName below.

    version

    This value must be 1.

    storageDriverName

    This value can be anything but must be the same as backendType below.

    managementLIF

    The management IP address for the backend logical interface.

    dataLIF

    The data IP address for the backend logical interface.

    svm

    The storage virtual machine type to use.

    username

    The username for authentication against the netapp backend.

    password

    The password for authentication against the netapp backend.

    The following parameters are optional:

    trident_setup_dir

    Set a staging directory for generated configuration files. The default is /tmp/trident.

    trident_namespace

    Set this option to use an alternate Kubernetes namespace.

    trident_rest_api_port

    Use an alternate port for the Trident REST API. The default is 8000.

    trident_install_extra_params

    Add extra space-separated parameters when installing trident.

    For complete listings of available parameters, see

    https://opendev.org/starlingx/ansible-playbooks/src/commit/d05785ffd9add6553662fcab43f30bf8d9f6d2e3/playbookconfig/src/playbooks/host_vars/netapp/default.yml

    and

    https://opendev.org/starlingx/ansible-playbooks/src/commit/d05785ffd9add6553662fcab43f30bf8d9f6d2e3/playbookconfig/src/playbooks/roles/k8s-storage-backends/netapp/vars/main.yml

    The following example shows a minimal configuration in localhost.yaml:

    ansible_become_pass: xx43U~a96DN*m.?
    trident_setup_dir: /tmp/trident
    netapp_k8s_storageclasses:
        - metadata:
            name: netapp-nas-backend
        provisioner: netapp.io/trident
        parameters:
            backendType: "ontap-nas"
    
    netapp_k8s_snapshotstorageclasses:
        - metadata:
            name: csi-snapclass
        driver: csi.trident.netapp.io
        deletionPolicy: Delete
    
    netapp_backends:
        - version: 1
        storageDriverName: "ontap-nas"
        backendName: "nas-backend"
        managementLIF: "10.0.0.1"
        dataLIF: "10.0.0.2"
        svm: "svm_nfs"
        username: "admin"
        password: "secret"
    

    This file is sectioned into netapp_k8s_storageclass, netapp_k8s_snapshotstorageclasses, and netapp_backends. You can add multiple backends and/or storage classes.

    Note

    To use IPv6 addressing, you must add the following to your configuration:

    trident_install_extra_params: "--use-ipv6"
    

    For more information about configuration options, see https://netapp-trident.readthedocs.io/en/stable-v20.04/kubernetes/operations/tasks/backends/ontap.html.

    Note

    By default, Netapp is configured to have 777 as unixPermissions. StarlingX recommends changing these settings to make it more secure, for example, "unixPermissions": "755". Ensure that the right permissions are used, and there is no conflict with container security.

    Do NOT use 777 as unixPermissions to configure an external Netapp deployment as the Storage backend. For more information, contact Netapp, at https://www.netapp.com/.

  7. Run the playbook.

    The following example uses the -e option to specify a customized location for the localhost.yml file.

    # ansible-playbook /usr/share/ansible/stx-ansible/playbooks/install_netapp_backend.yml -e "override_files_dir=</home/sysadmin/mynetappconfig>"
    

    Upon successful launch, there will be one Trident pod running on each node, plus an extra pod for the REST API running on one of the controller nodes.

  8. Confirm that the pods launched successfully.

    In an all-in-one simplex environment you will see pods similar to the following:

    (keystone_admin)$ kubectl -n <tridentNamespace> get pods
    NAME                          READY   STATUS    RESTARTS   AGE
    trident-csi-c4575c987-ww49n   5/5     Running   0          0h5m
    trident-csi-hv5l7             2/2     Running   0          0h5m
    

Postrequisites

To configure a persistent volume claim for the Netapp backend, add the appropriate storage-class name you set up in step 2 (netapp-nas-backend in this example) to the persistent volume claim’s yaml configuration file. For more information about this file, see StarlingX User Tasks: Create ReadWriteOnce Persistent Volume Claims.

Configure Netapps Using a Private Docker Registry

Use the docker_registries parameter to pull from the local registry rather than public ones.

You must first push the files to the local registry.