Feature Overview (aka. Goal Summary)  

Introduce the new PV access mode ReadWriteOncePod as tech preview.

Such PV/PVC can be used only in a single pod on a single node compared to the traditional ReadWriteOnce access mode, where such a PV/PVC can be used on a single node by many pods.

Goals (aka. expected user outcomes)

The customers can start testing the new ReadWriteOncePod access mode as tech preview and provide feedback.

This new mode allows customers to provision and attach PV and get the guarantee that it cannot be attached to another local pod.

Requirements (aka. Acceptance Criteria):

This new mode should support the same operations as regular ReadWriteOnce PVs therefore it should pass the regression tests. We should also ensure that this PV can't be accessed by another local-to-node pod.

Use Cases (Optional):

As a user I want to attach a PV to a pod and ensure that it can't be accessed by another local pod.

Background

We are getting this feature from upstream as beta. We need to test it and offer as tech preview.

• Enhancement issue: https://github.com/kubernetes/enhancements/issues/2485
• KEP: https://github.com/kubernetes/enhancements/pull/2489

Customer Considerations

Check that there is no limitations / regression.

Documentation Considerations

Add documentation for this new mode and what it does. 

Add tech preview statement

Add limitations & known issues if any found 

Interoperability Considerations

N/A