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Warn users of migrating without draining #822

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Apr 6, 2021
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Warn users of migrating without draining #822

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4 changes: 3 additions & 1 deletion docs/README.md
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Expand Up @@ -161,12 +161,14 @@ Make sure you follow the [Prerequisites](README.md#Prerequisites) before the exa
* [Volume Resizing](../examples/kubernetes/resizing)

## Migrating from in-tree EBS plugin
Starting from Kubernetes 1.17, CSI migration is supported as beta feature (alpha since 1.14). If you have persistence volumes that are created with in-tree `kubernetes.io/aws-ebs` plugin, you could migrate to use EBS CSI driver. To turn on the migration, set `CSIMigration` and `CSIMigrationAWS` feature gates to `true` for `kube-controller-manager` and `kubelet`.
Starting from Kubernetes 1.17, CSI migration is supported as beta feature (alpha since 1.14). If you have persistence volumes that are created with in-tree `kubernetes.io/aws-ebs` plugin, you could migrate to use EBS CSI driver. To turn on the migration, drain the node and set `CSIMigration` and `CSIMigrationAWS` feature gates to `true` for `kube-controller-manager` and `kubelet`.

To make sure dynamically provisioned EBS volumes have all tags that the in-tree volume plugin used:
* Run the external-provisioner sidecar with `--extra-create-metadata=true` cmdline option. External-provisioner v1.6 or newer is required.
* Run the CSI driver with `--k8s-tag-cluster-id=<ID of the Kubernetes cluster>` command line option.

**Warning**:
* kubelet *must* be drained of all pods with mounted EBS volumes ***before*** changing its CSI migration feature flags. Failure to do this will cause deleted pods to get stuck in `Terminating`, requiring a forced delete which can cause filesystem corruption. See [#679](../../../issues/679) for more details.

## Development
Please go through [CSI Spec](https://github.com/container-storage-interface/spec/blob/master/spec.md) and [General CSI driver development guideline](https://kubernetes-csi.github.io/docs/developing.html) to get some basic understanding of CSI driver before you start.
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