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CSI documentation update for raw block volume support #8927

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Jun 18, 2018
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CSI documentation update for raw block volume support #8927

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00e5f9d
CSI documetation update for raw block volume support
vladimirvivien Jun 5, 2018
d297404
minor edits for "CSI raw block volume support"
chenopis Jun 18, 2018
cac7761
minor CSIBlockVolume edits
chenopis Jun 18, 2018
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20 changes: 20 additions & 0 deletions content/en/docs/concepts/storage/volumes.md
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Expand Up @@ -1152,6 +1152,26 @@ persistent volume:
secret is required. If the secret object contains more than one secret, all
secrets are passed.

#### CSI raw block volume support

{{< feature-state for_k8s_version="v1.11" state="alpha" >}}

Starting with version 1.11, CSI introduced support for raw block volumes, which
relies on the raw block volume feature that was introduced in a previous version of
Kubernetes. This feature will make it possible for vendors with external CSI drivers to
implement raw block volumes support in Kubernetes workloads.

CSI block volume support is feature-gated and turned off by default. To run CSI with
block volume support enabled, a cluster administrator must enable the feature for each
Kubernetes component using the following feature gate flags:

```
--feature-gates=BlockVolume=true,CSIBlockVolume=true
```

Learn how to
[setup your PV/PVC with raw block volume support](/docs/concepts/storage/persistent-volumes/#raw-block-volume-support).

### FlexVolume

`FlexVolume` is an out-of-tree plugin interface that has existed in Kubernetes
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2 changes: 2 additions & 0 deletions content/en/docs/reference/command-line-tools-reference/feature-gates.md
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Expand Up @@ -40,6 +40,7 @@ different Kubernetes components.
| `CPUManager` | `true` | Beta | 1.10 | |
| `CRIContainerLogRotation` | `false` | Alpha | 1.10 | 1.10 |
| `CRIContainerLogRotation` | `true` | Beta| 1.11 | |
| `CSIBlockVolume` | `false` | Alpha | 1.11 | 1.11 |
| `CSIPersistentVolume` | `false` | Alpha | 1.9 | 1.9 |
| `CSIPersistentVolume` | `true` | Beta | 1.10 | |
| `CustomPodDNS` | `false` | Alpha | 1.9 | 1.9 |
Expand Down Expand Up @@ -151,6 +152,7 @@ Each feature gate is designed for enabling/disabling a specific feature:
for more details.
- `CPUManager`: Enable container level CPU affinity support, see [CPU Management Policies](/docs/tasks/administer-cluster/cpu-management-policies/).
- `CRIContainerLogRotation`: Enable container log rotation for cri container runtime.
- `CSIBlockVolume`: Enable external CSI volume drivers to support block storage. See the [`csi` raw block volume support](/docs/concepts/storage/volumes/#csi-raw-block-volume-support) documentation for more details.
- `CSIPersistentVolume`: Enable discovering and mounting volumes provisioned through a
[CSI (Container Storage Interface)](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/storage/container-storage-interface.md)
compatible volume plugin.
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