Deploy CSI drivers for Dell PowerScale storage solutions

Dell PowerScale is a flexible and secure scale-out NAS (network attached storage) solution designed to simplify storage requirements for AI and HPC workloads. To enable the PowerScale storage solution on the Kubernetes clusters, Omnia installs the Dell CSI PowerScale driver (version 2.11.0) on the nodes using helm charts. Once the PowerScale CSI driver is installed, the PowerScale nodes can be connected to the Kubernetes clusters for storage requirements. To know more about the CSI PowerScale driver, click here.

Caution

PowerScale CSI driver installation is only supported on RHEL 8.8, Rocky Linux 8.8, and Ubuntu 22.04 clusters.

Note

Omnia doesn’t configure any PowerScale device via OneFS (operating system for PowerScale). Omnia configures the deployed Kubernetes cluster to interact with the PowerScale storage.

PowerScale SmartConnect [Optional]

To utilize the PowerScale SmartConnect hostname, it is necessary for the user to have an upstream DNS server that includes delegation mappings of hostname to PowerScale IP addresses. During the provisioning of cluster nodes, users can specify the IP of the upstream DNS server in the input/network_spec.yml file. This ensures that the Omnia cluster recognizes and is aware of the upstream DNS server, enabling the use of PowerScale SmartConnect hostname functionality. For example:
```
---
    Networks:
    - admin_network:
        nic_name: <network name>
        netmask_bits: "16"
        static_range: <static ip range>
        dynamic_range: <dynamic ip range>
        correlation_to_admin: true
        admin_uncorrelated_node_start_ip: ""
        network_gateway: ""
        DNS: <upstream DNS server>
        MTU: "1500"
```
If the user did not specify the upstream DNS server during the provisioning process and wishes to utilize PowerScale SmartConnect afterwards, then the user must first add the upstream DNS server IP to the DNS entry in input/network_spec.yml and then re-run the discovery-provision.yml playbook.

Prerequisites

Download the secret.yaml file template from this link.
Update the following parameters in the secret.yaml file as per your cluster details and keep the rest as default values. For example:
- clusterName: <desired cluster name>
- username: <username>
- password: <password>
- endpoint: <endpoint_IP>
Note

If PowerScale SmartConnect hostname is configured, user can provide the PowerScale hostname for endpoint. Otherwise user can provide PowerScale IP address as well.
- endpointPort: <endpoint_port>
- isDefault: true
- isiPath: “/ifs/data/csi”
Reference values from OneFS portal:

Download the values.yaml files template using the following command:

wget https://raw.githubusercontent.com/dell/helm-charts/csi-isilon-2.11.0/charts/csi-isilon/values.yaml

Update the following parameters in the values.yaml file and keep the rest as default values. Refer the below sample values:
- controllerCount: 1
- replication:
  
  enabled: false
- snapshot:
  
  enabled: true
- resizer:
  
  enabled: false
- healthMonitor:
  
  enabled: false
- endpointPort:8080
- skipCertificateValidation: true
- isiAccessZone: System
- isiPath: /ifs/data/csi

Note

In order to integrate PowerScale solution to the deployed Kubernetes cluster, Omnia 1.7 requires the following fixed parameter values in values.yaml file:

controllerCount: 1
Replication: false
Snapshot: true
skipCertificateValidation: true

Note

Once the PowerScale CSI driver has been deployed, the parameters in the values.yaml can’t be changed. If the user wants to modify the values.yaml file, they must first uninstall the PowerScale CSI driver from the cluster and then re-install with the updated parameters.

Installation Process

Once secret.yaml and values.yaml is filled up with the necessary details, copy both files to any directory on the OIM. For example, /tmp/secret.yaml and /tmp/values.yaml.
Add the csi_driver_powerscale entry along with the driver version to the omnia/input/software_config.json file:
```
{"name": "csi_driver_powerscale", "version":"v2.11.0"}
```

Note

By default, the csi_driver_powerscale entry is not present in the input/software_config.json.

Execute the local_repo.yml playbook to download the required artifacts to the OIM:
```
cd local_repo
ansible-playbook local_repo.yml
```
Add the filepath of the secret.yaml and values.yaml file to the csi_powerscale_driver_secret_file_path and csi_powerscale_driver_values_file_path variables respectively, present in the omnia/input/omnia_config.yml file.

Execute the omnia.yml playbook to install the PowerScale CSI driver:

cd omnia
ansible-playbook omnia.yml -i <inventory_filepath>

Note

There isn’t a separate playbook to run for PowerScale CSI driver installation. Running omnia.yml with necessary inputs installs the driver. If Kubernetes is already deployed on the cluster, users can also run the scheduler.yml playbook to install the PowerScale CSI driver.

After running omnia.yml playbook, the secret.yaml file will be encrypted. User can use below command to decrypt and edit it if required:

cd omnia
ansible-vault edit <secret.yaml filepath> --vault-password-file scheduler/roles/k8s_csi_powerscale_plugin/files/.csi_powerscale_secret_vault

Caution

Do not delete the vault key file .csi_powerscale_secret_vault, otherwise users will not be able to decrypt the secret.yaml file anymore.

Expected Results

After the successful execution of the omnia.yml playbook, the PowerScale CSI driver is deployed in the isilon namespace.

Along with PowerScale driver installation a storage class named ps01 is also created. The details of the storage class are as follows:

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: ps01
provisioner: csi-isilon.dellemc.com
reclaimPolicy: Delete
allowVolumeExpansion: true
volumeBindingMode: Immediate
parameters:
  AccessZone: < access zone mentioned in values.yaml file >
  Isipath: < isipath mentioned in values.yaml file >
  RootClientEnabled: "true"
  csi.storage.k8s.io/fstype: "nfs"

If there are errors during CSI driver installation, the whole omnia.yml playbook execution does not stop or fail. It pauses for 30 seconds with CSI driver installation failure error message and then proceeds with rest of the playbook execution.
For an unsuccessful driver installation scenario, the user first needs to follow the manual removal steps mentioned below from the kube_control_plane, and then re-run the omnia.yml playbook for CSI driver installation.

Post installation

[Optional] Create custom storage class

If user wants to create a custom storage class, they can do so by following the sample storage class template.

Sample storageclass template:

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata :
  name: <storage class name>
provisioner: csi-isilon.dellemc.com
reclaimPolicy: Delete
allowVolumeExpansion: true
volumeBindingMode: Immediate
parameters :
  clusterName: <powerscale cluster name > #optional
  AccessZone: System
  AzServiceIP: <PowerScale SmartConnect hostname or PowerScale IP> #optional
  Isipath: <isipath configured in powerscale > #sample: /ifs/data/csi/
  RootClientEnabled: "true"
  csi.storage.k8s.io/fstype: "nfs"

Note

If PowerScale SmartConnect hostname is configured and the delegated host list is set up in the external DNS server, then the user can provide the PowerScale hostname for AzServiceIP. Otherwise user can provide PowerScale IP address as well.
If there are any changes to the storage class parameters in a PowerScale cluster, the user must update the existing storage class or create a new one as needed.

Apply storage class

Use the following command to apply the storageclass:

kubectl apply -f <storageclass name>

Create Persistent Volume Claim (PVC)

Once the storage class is created, the same can be used to create PVC.

Sample deployment with PVC:

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: pvc-powerscale
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 1Gi
  storageClassName: ps01
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deploy-busybox-01
spec:
  strategy:
    type: Recreate
  replicas: 1
  selector:
    matchLabels:
      app: deploy-busybox-01
  template:
    metadata:
      labels:
        app: deploy-busybox-01
    spec:
      containers:
        - name: busybox
          image: registry.k8s.io/busybox
          command: ["sh", "-c"]
          args: ["while true; do touch /data/datafile; rm -f /data/datafile; done"]
          volumeMounts:
            - name: data
              mountPath: /data
          env:
            - name: http_proxy
              value: "http://<OIM IP>:3128"
            - name: https_proxy
              value: "http://<OIM IP>:3128"
      volumes:
        - name: data
          persistentVolumeClaim:
            claimName: pvc-powerscale

Apply the deployment manifest along with PVC

Use the following command to apply the manifest:

kubectl apply -f <manifest_filepath>

Expected Result:

Once the above manifest is applied, a PVC is created under name pvc-powerscale and is in Bound status. Use the kubectl get pvc -A command to bring up the PVC information. For example:

root@node001:/opt/omnia/csi-driver-powerscale/csi-powerscale/dell-csi-helm-installer# kubectl get pvc -A
NAMESPACE   NAME                STATUS   VOLUME           CAPACITY   ACCESS MODES   STORAGECLASS   VOLUMEATTRIBUTESCLASS   AGE
default     pvc-powerscale      Bound    k8s-b00f77b817   1Gi        RWX            ps01           <unset>                 27h

User can also verify the same information from the OneFS portal. In the sample image below, it is mapped with the VOLUME entry from the above example: k8s-b00f77b817:

Removal

To remove the PowerScale driver manually, do the following:

Login to the kube_control_plane.
Execute the following command to switch to the dell-csi-helm-installer directory:
```
cd /opt/omnia/csi-driver-powerscale/csi-powerscale/dell-csi-helm-installer
```
Once you’re inside the dell-csi-helm-installer directory, use the following command to trigger the csi-uninstall script:
```
./csi-uninstall.sh --namespace isilon
```
After running the previous command, the PowerScale driver is removed. But, the secret and the created PVC are not removed. If users want to remove them, they need to do it manually from the “isilon” namespace.
If users don’t want to use PowerScale anymore, they can remove the following as well:
1. Remove the PowerScale secret by executing the following commands one after the other:
  kubectl delete secret isilon-creds -n isilon
  
  kubectl delete secret isilon-certs-0 -n isilon
2. Remove any custom user deployment and PVC that was using PowerScale storage class.
3. Remove the PowerScale storage class.

Note

In case OneFS portal credential changes, users need to perform following steps to update the changes to the secret.yaml manually:

Update the secret.yaml file with the changed credentials.
Login and copy the secret.yaml file to the kube_control_plane.
Delete the existing secret by executing the following command:
```
kubectl delete secret isilon-creds -n isilon
```

Create the new secret from the updated secret.yaml file by executing the following command:

kubectl create secret generic isilon-creds -n isilon --from-file=config=<updated secret.yaml filepath>

If you have any feedback about Omnia documentation, please reach out at omnia.readme@dell.com.