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Documentation for MountPropagation beta #7655

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Mar 8, 2018
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Documentation for MountPropagation beta #7655

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2bfafef
Documentation for MountPropagation beta
jsafrane Mar 6, 2018
f99128b
Merge branch 'release-1.10' into mount-propagation-beta
Bradamant3 Mar 8, 2018
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12 changes: 4 additions & 8 deletions docs/concepts/storage/volumes.md
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Expand Up @@ -1020,9 +1020,7 @@ More details can be found [here](https://github.com/kubernetes/community/blob/ma

## Mount propagation

**Note:** Mount propagation is an alpha feature in Kubernetes 1.8 and may be
redesigned or even removed in future releases.
{: .note}
{% assign for_k8s_version="v1.10" %}{% include feature-state-beta.md %}

Mount propagation allows for sharing volumes mounted by a Container to
other Containers in the same Pod, or even to other Pods on the same node.
Expand All @@ -1031,14 +1029,12 @@ If the "`MountPropagation`" feature is disabled, volume mounts in pods are not p
That is, Containers run with `private` mount propagation as described in the
[Linux kernel documentation](https://www.kernel.org/doc/Documentation/filesystems/sharedsubtree.txt).

To enable this feature, specify `MountPropagation=true` in the
`--feature-gates` command line option for the API server and kubelets.
When enabled, the `volumeMounts` field of a Container has a new
`mountPropagation` subfield. Its values are:
Mount propagation of a volume is controlled by `mountPropagation` field in Container.volumeMounts.
Its values are:

* `HostToContainer` - This volume mount will receive all subsequent mounts
that are mounted to this volume or any of its subdirectories. This is
the default mode when the MountPropagation feature is enabled.
the default mode.

In other words, if the host mounts anything inside the volume mount, the
Container will see it mounted there.
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3 changes: 2 additions & 1 deletion docs/reference/feature-gates.md
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Expand Up @@ -60,7 +60,8 @@ different Kubernetes components.
| `LocalStorageCapacityIsolation` | `false` | Alpha | 1.7 | 1.9 |
| `LocalStorageCapacityIsolation` | `true` | Beta| 1.10 | |
| `MountContainers` | `false` | Alpha | 1.9 | |
| `MountPropagation` | `false` | Alpha | 1.8 | |
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We keep tracking the status of each feature gates so you may want to revise this line AND add the following line:

| `MountPropagation` | `false` | Alpha | 1.8 | 1.9  |

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Fixed

| `MountPropagation` | `false` | Alpha | 1.8 | 1.9 |
| `MountPropagation` | `true` | Beta | 1.10 | |
| `PersistentLocalVolumes` | `false` | Alpha | 1.7 | 1.9 |
| `PersistentLocalVolumes` | `true` | Beta | 1.10 | |
| `PodPriority` | `false` | Alpha | 1.8 | |
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