Support ReadWriteOncePod (kube v1.22+)

[ashtonian]

Is your feature request related to a problem?/Why is this needed
The new ReadWriteOncePod access mode will be added to PVC, not sure what needs to change if much at all.

KEP-2485: ReadWriteOncePod PersistentVolume AccessMode

kubernetes/enhancements#2485

/feature

Describe the solution you'd like in detail

The driver to support ReadWriteOncePod.

Describe alternatives you've considered
Not using ReadWriteOncePod.

Additional context

[chrishenzie]

Thank you for opening this issue, I'm excited to see drivers add support for this feature!

There will be a Kubernetes feature blog posted in the next month that outlines how to implement support for this in your driver in more depth. I would recommend waiting to implement support for this until it is posted.

In short, this feature will work out of the box without any changes to the EFS CSI driver so long as the following is true:

• The cluster is 1.22+
• The ReadWriteOncePod feature gate is enabled on kube-apiserver, kube-scheduler, and kubelet
• (If using dynamic provisioning) your cluster is running CSI external-provisioner v3.0.0+ which adds support for ReadWriteOncePod

With that being said, the following will need to be done to implement support for new CSI access modes in the driver (not required, but recommended):

• Update the go.mod to depend on github.com/container-storage-interface/spec v1.5.0 which introduces two new CSI access modes
• Ensure NodeGetCapabilities() also returns csi.NodeServiceCapability_RPC_SINGLE_NODE_MULTI_WRITER
• Ensure ControllerGetCapabilities() also returns csi.ControllerServiceCapability_RPC_SINGLE_NODE_MULTI_WRITER
  • The above two capabilities communicate to the caller that the driver understands the two new CSI access modes
• Ensure volumeCapAccessModes includes the following two new CSI access modes:
  • csi.VolumeCapability_AccessMode_SINGLE_NODE_SINGLE_WRITER
  • csi.VolumeCapability_AccessMode_SINGLE_NODE_MULTI_WRITER

Please feel free to tag me on any Github issues or PRs related to this and I will be happy to assist and review. Thank you!

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[chrishenzie]

/remove-lifecycle stale

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/lifecycle stale

[chrishenzie]

/remove-lifecycle stale

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/lifecycle stale

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/lifecycle rotten

[chrishenzie]

/remove-lifecycle rotten

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/lifecycle stale

[chrishenzie]

/remove-lifecycle stale

I'm planning on graduating the feature to beta in 1.27. I'll want to update here before then.

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/lifecycle stale

[chrishenzie]

/remove-lifecycle stale

This feature is being moved to beta (in k8s) in 1.27.

To support this feature, technically nothing needs to change other than updating your CSI drivers. If you want to strictly enforce this access mode in the CSI driver, then see this PR as an example. You can also test this driver using the CSI sanity utility. Once this PR is merged you will be able to test this using the tool.

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/lifecycle stale

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/lifecycle rotten

[chrishenzie]

ReadWriteOncePod is now graduated to beta as of K8s v.127.

This feature does not require any extra changes to the AWS EFS CSI driver to work. The only thing users need to do is update their CSI sidecars to these versions or greater.

(Not required) You may update the AWS EFS CSI driver to advertise the new SINGLE_NODE_SINGLE_WRITER CSI access mode. See the above comment for more context.

[Ashley-wenyizha]

Thanks @chrishenzie for the info!

/kind feature

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/close not-planned

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@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

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[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
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/close not-planned

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