A StorageClass provides a way for administrators to describe the “classes” of storage they offer. Different classes might map to quality-of-service levels, or to backup policies, or to arbitrary policies determined by the cluster administrators. Kubernetes itself is unopinionated about what classes represent. This concept is sometimes called “profiles” in other storage systems.
https://kubernetes.io/docs/concepts/storage/storage-classes/
With Storage Classes, you can define a provisional such as Google storage that can automatically provision storage on Google Cloud and attach that to pods when a claim is made.
GCP example
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
name: google-storage
provisioner: kubernetes.io/gce-pdProvisioner
Each StorageClass has a provisioner that determines what volume plugin is used for provisioning PVs. This field must be specified.
| Volume Plugin | Internal Provisioner | Config Example |
|---|---|---|
| AWSElasticBlockStore | ✓ | AWS EBS |
| AzureFile | ✓ | Azure File |
| AzureDisk | ✓ | Azure Disk |
| CephFS | – | – |
| Cinder | ✓ | OpenStack Cinder |
| FC | – | – |
| FlexVolume | – | – |
| Flocker | ✓ | – |
| GCEPersistentDisk | ✓ | GCE PD |
| Glusterfs | ✓ | Glusterfs |
| iSCSI | – | – |
| Quobyte | ✓ | Quobyte |
| NFS | – | – |
| RBD | ✓ | Ceph RBD |
| VsphereVolume | ✓ | vSphere |
| PortworxVolume | ✓ | Portworx Volume |
| ScaleIO | ✓ | ScaleIO |
| StorageOS | ✓ | StorageOS |
| Local | – |