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[20.10 backport] docs: update deprecation status for "overlay2.override_kernel_check" #3807

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merged 1 commit into from Oct 12, 2022
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[20.10 backport] docs: update deprecation status for "overlay2.override_kernel_check" #3807

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14 changes: 14 additions & 0 deletions docs/deprecated.md
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Expand Up @@ -67,6 +67,7 @@ The table below provides an overview of the current status of deprecated feature
| Removed | [`docker engine` subcommands](#docker-engine-subcommands) | v19.03 | v20.10 |
| Removed | [Top-level `docker deploy` subcommand (experimental)](#top-level-docker-deploy-subcommand-experimental) | v19.03 | v20.10 |
| Removed | [`docker stack deploy` using "dab" files (experimental)](#docker-stack-deploy-using-dab-files-experimental) | v19.03 | v20.10 |
| Disabled | [Support for the `overlay2.override_kernel_check` storage option](#support-for-the-overlay2override_kernel_check-storage-option) | v19.03 | - |
| Deprecated | [AuFS storage driver](#aufs-storage-driver) | v19.03 | - |
| Deprecated | [Legacy "overlay" storage driver](#legacy-overlay-storage-driver) | v18.09 | - |
| Deprecated | [Device mapper storage driver](#device-mapper-storage-driver) | v18.09 | - |
Expand Down Expand Up @@ -323,6 +324,19 @@ format, support for the DAB file format and the top-level docker deploy command
(hidden by default in 19.03), will be removed, in favour of `docker stack deploy`
using compose files.

### Support for the `overlay2.override_kernel_check` storage option

**Deprecated in Release: v19.03**
**Disabled in Release: v19.03**

This daemon configuration option disabled the Linux kernel version check used
to detect if the kernel supported OverlayFS with multiple lower dirs, which is
required for the overlay2 storage driver. Starting with Docker v19.03.7, the
detection was improved to no longer depend on the kernel _version_, so this
option was no longer used.

Docker v22.06 logs a warning in the daemon logs if this option is set, and
users should remove this option from their daemon configuration.

### AuFS storage driver

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11 changes: 1 addition & 10 deletions docs/reference/commandline/dockerd.md
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Expand Up @@ -820,20 +820,11 @@ $ sudo dockerd -s btrfs --storage-opt btrfs.min_space=10G

#### Overlay2 options

##### `overlay2.override_kernel_check`

Overrides the Linux kernel version check allowing overlay2. Support for
specifying multiple lower directories needed by overlay2 was added to the
Linux kernel in 4.0.0. However, some older kernel versions may be patched
to add multiple lower directory support for OverlayFS. This option should
only be used after verifying this support exists in the kernel. Applying
this option on a kernel without this support will cause failures on mount.

##### `overlay2.size`

Sets the default max size of the container. It is supported only when the
backing fs is `xfs` and mounted with `pquota` mount option. Under these
conditions the user can pass any size less then the backing fs size.
conditions the user can pass any size less than the backing fs size.

###### Example

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