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Deprecate legacy overlay storage driver #1425

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Oct 17, 2018
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Deprecate legacy overlay storage driver #1425

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16 changes: 16 additions & 0 deletions docs/deprecated.md
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Expand Up @@ -19,6 +19,22 @@ The following list of features are deprecated in Engine.
To learn more about Docker Engine's deprecation policy,
see [Feature Deprecation Policy](https://docs.docker.com/engine/#feature-deprecation-policy).

### Legacy "overlay" storage driver

**Deprecated in Release: v18.09.0**

The `overlay` storage driver is deprecated in favor of the `overlay2` storage
driver, which has all the benefits of `overlay`, without its limitations (excessive
inode consumption). The legacy `overlay` storage driver will be removed in a future
release. Users of the `overlay` storage driver should migrate to the `overlay2`
storage driver.

The legacy `overlay` storage driver allowed using overlayFS-backed filesystems
on pre 4.x kernels. Now that all supported distributions are able to run `overlay2`
(as they are either on kernel 4.x, or have support for multiple lowerdirs
backported), there is no reason to keep maintaining the `overlay` storage driver.


### Reserved namespaces in engine labels

**Deprecated in Release: v18.06.0**
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