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Configure a storage class and PVC

Contributors netapp-aruldeepa

Configure a Kubernetes StorageClass object and create the storage class to instruct Astra Trident how to provision volumes. Create a PersistentVolume (PV) and a PersistentVolumeClaim (PVC) that uses the configured Kubernetes StorageClass to request access to the PV. You can then mount the PV to a pod.

Create a storage class

Configure a Kubernetes StorageClass object

The Kubernetes StorageClass object identifies Astra Trident as the provisioner that is used for that class instructs Astra Trident how to provision a volume. For example:

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: ontap-gold
provisioner: csi.trident.netapp.io
parameters:
  backendType: "ontap-nas"
  media: "ssd"
  provisioningType: "thin"
  snapshots: "true"

Refer to Kubernetes and Trident objects for details on how storage classes interact with the PersistentVolumeClaim and parameters for controlling how Astra Trident provisions volumes.

Create a storage class

Steps

  1. This is a Kubernetes object, so use kubectl to create it in Kubernetes.

    kubectl create -f storage-class-ontapnas.yaml

  2. You should now see a basic-csi storage class in both Kubernetes and Astra Trident, and Astra Trident should have discovered the pools on the backend.

    kubectl get sc basic-csi
NAME         PROVISIONER             AGE
basic-csi    csi.trident.netapp.io   15h

Create the PV and PVC

A PersistentVolume (PV) is a physical storage resource provisioned by the cluster administrator on a Kubernetes cluster. The PersistentVolumeClaim (PVC) is a request for access to the PersistentVolume on the cluster.

The PVC can be configured to request storage of a certain size or access mode. Using the associated StorageClass, the cluster administrator can control more than PersistentVolume size and access mode—​such as performance or service level.

After you create the PV and PVC, you can mount the volume in a pod.

Sample manifests

PersistentVolume sample manifest

This sample manifest shows a basic PV of 10Gi that is associated with StorageClass basic-csi.

apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv-storage
  labels:
    type: local
spec:
  storageClassName: basic-csi
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteMany
  hostPath:
    path: "/my/host/path"
PersistentVolumeClaim sample manifests

These examples show basic PVC configuration options.

PVC with RWO access

This example shows a basic PVC with RWX access that is associated with a StorageClass named basic-csi.

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: pvc-storage
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 1Gi
  storageClassName: basic-csi
PVC with NVMe/TCP

This example shows a basic PVC for NVMe/TCP with RWO access that is associated with a StorageClass named protection-gold.

---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
name: pvc-san-nvme
spec:
accessModes:
  - ReadWriteOnce
resources:
  requests:
    storage: 300Mi
storageClassName: protection-gold

Create the PV and PVC

Steps

  1. Create the PV.

    kubectl create -f pv.yaml

  2. Verify the PV status.

    kubectl get pv
NAME        CAPACITY  ACCESS MODES  RECLAIM POLICY  STATUS    CLAIM  STORAGECLASS  REASON  AGE
pv-storage  4Gi       RWO           Retain          Available                              7s

  3. Create the PVC.

    kubectl create -f pvc.yaml

  4. Verify the PVC status.

    kubectl get pvc
NAME        STATUS VOLUME     CAPACITY ACCESS MODES STORAGECLASS AGE
pvc-storage Bound  pv-name 2Gi      RWO                       5m

Refer to Kubernetes and Trident objects for details on how storage classes interact with the PersistentVolumeClaim and parameters for controlling how Astra Trident provisions volumes.

Astra Trident attributes

These parameters determine which Astra Trident-managed storage pools should be utilized to provision volumes of a given type.

Attribute Type Values Offer Request Supported by

media1

string

hdd, hybrid, ssd

Pool contains media of this type; hybrid means both

Media type specified

ontap-nas, ontap-nas-economy, ontap-nas-flexgroup, ontap-san, solidfire-san

provisioningType

string

thin, thick

Pool supports this provisioning method

Provisioning method specified

thick: all ontap; thin: all ontap & solidfire-san

backendType

string

ontap-nas, ontap-nas-economy, ontap-nas-flexgroup, ontap-san, solidfire-san, gcp-cvs, azure-netapp-files, ontap-san-economy

Pool belongs to this type of backend

Backend specified

All drivers

snapshots

bool

true, false

Pool supports volumes with snapshots

Volume with snapshots enabled

ontap-nas, ontap-san, solidfire-san, gcp-cvs

clones

bool

true, false

Pool supports cloning volumes

Volume with clones enabled

ontap-nas, ontap-san, solidfire-san, gcp-cvs

encryption

bool

true, false

Pool supports encrypted volumes

Volume with encryption enabled

ontap-nas, ontap-nas-economy, ontap-nas-flexgroups, ontap-san

IOPS

int

positive integer

Pool is capable of guaranteeing IOPS in this range

Volume guaranteed these IOPS

solidfire-san

1: Not supported by ONTAP Select systems