CSI, or Container Storage Interface, is the new model for integrating storage system service with Kubernetes and other orchestration systems. Kubernetes has had support for CSI since 1.10 as beta.

With CSI, Kubernetes gives storage drivers the opportunity to release on their schedule. This allows storage vendors to upgrade, update, and enhance their drivers without the need to update Kubernetes, maintaining a consistent, dependable, orchestration system.

Status

Note, that currently this deployment mode is available only as a Tech Preview for Release 1.4.

Install

Install using the Portworx spec generator

When installing Portworx through install.portworx.com/1.4 you can select CSI as the model to use for deployment.

If you are using curl to fetch the Portworx spec, you can add csi=true to the parameter list to include CSI specs in the generated file.

Impact on applications

The only affected object is the StorageClass. For any StorageClasses created, you will need to setup the value of provisioner to com.openstorage.pxd. Here is an example:

kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: portworx
provisioner: com.openstorage.pxd
parameters:
  repl: "3"

Your PersistentVolumes and PersistentVolumeClaims will all work the same as before.

Upgrade

Currently upgrades are not supported. You will need to deploy using CSI onto a new Kubernetes cluster. The Kubernetes community is working very hard to make this possible in the near future.

Contribute

Portworx welcomes contributions to our CSI implemenation, which is open-source and repository is at OpenStorage.