Dynamic volume provisioning with StorageClass

To resolve these issues, Kubernetes provides another API Object called StorageClass. With StorageClass, Kubernetes is able to interact with the cloud provider directly. This allows Kubernetes to provision new storage volumes, and create PersistentVolumes automatically.

Basically, a PersistentVolume is a representation of a piece of storage, whereas StorageClass is a specification of how to create PersistentVolumes dynamically. StorageClass abstracts the manual processes into a set of fields you can specify inside a manifest file.

Defining a StorageClass

For example, if you want to create a StorageClass that will create Amazon EBS Volume of type General Purpose SSD (gp2), you'd define a StorageClass manifest like so:

kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: standard
provisioner: kubernetes.io/aws-ebs
parameters:
  type: gp2
reclaimPolicy: Retain

 

 

Here's what each field means (required fields are marked with an asterik (*...