CSI ephemeral volume alpha documentation (#10934)

content/en/docs/concepts/storage/volumes.md

@@ -1225,7 +1225,44 @@ feature gates which must be enabled for this feature are `BlockVolume` and
 Learn how to
 [setup your PV/PVC with raw block volume support](/docs/concepts/storage/persistent-volumes/#raw-block-volume-support).
 
-#### Developer resources
+#### CSI ephemeral volumes
+
+{{< feature-state for_k8s_version="v1.14" state="alpha" >}}
+
+This feature allows CSI volumes to be directly embedded in the Pod specification instead of a PersistentVolume. Volumes specified in this way are ephemeral and do not persist across Pod restarts.
+
+Example:
+
+```yaml
+kind: Pod
+apiVersion: v1
+metadata:
+  name: my-csi-app
+spec:
+  containers:
+    - name: my-frontend
+      image: busybox
+      volumeMounts:
+      - mountPath: "/data"
+        name: my-csi-inline-vol
+      command: [ "sleep", "1000000" ]
+  volumes:
+    - name: my-csi-inline-vol
+      csi:
+        driver: inline.storage.kubernetes.io
+        volumeAttributes:
+              foo: bar
+```
+
+This feature requires CSIInlineVolume feature gate to be enabled:
+
+```
+--feature-gates=CSIInlineVolume=true
+```
+
+CSI ephemeral volumes are only supported by a subset of CSI drivers. Please see the list of CSI drivers [here](https://kubernetes-csi.github.io/docs/drivers.html).
+
+# Developer resources
 For more information on how to develop a CSI driver, refer to the [kubernetes-csi
 documentation](https://kubernetes-csi.github.io/docs/)
 

content/en/docs/reference/command-line-tools-reference/feature-gates.md

@@ -59,6 +59,7 @@ different Kubernetes components.
 | `CSIBlockVolume` | `true` | Beta | 1.14 | |
 | `CSIDriverRegistry` | `false` | Alpha | 1.12 | 1.13 |
 | `CSIDriverRegistry` | `true` | Beta | 1.14 | |
+| `CSIInlineVolume` | `false` | Alpha | 1.14 | - |
 | `CSINodeInfo` | `false` | Alpha | 1.12 | 1.13 |
 | `CSINodeInfo` | `true` | Beta | 1.14 | |
 | `CSIPersistentVolume` | `false` | Alpha | 1.9 | 1.9 |
@@ -222,6 +223,7 @@ Each feature gate is designed for enabling/disabling a specific feature:
   [CSI (Container Storage Interface)](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/storage/container-storage-interface.md)
   compatible volume plugin.
   Check the [`csi` volume type](/docs/concepts/storage/volumes/#csi) documentation for more details.
+- `CSIInlineVolume`: Enable CSI volumes to be directly embedded in Pod specifications instead of a PersistentVolume.
 - `CustomPodDNS`: Enable customizing the DNS settings for a Pod using its `dnsConfig` property.
    Check [Pod's DNS Config](/docs/concepts/services-networking/dns-pod-service/#pods-dns-config)
    for more details.