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Allow option to override kernel check in overlay2

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Add option to skip kernel check for older kernels which have been patched to support multiple lower directories in overlayfs.

Fixes #24023

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
Upstream-commit: ff98da0607c4d6a94a2356d9ccaa64cc9d7f6a78
Component: engine
This commit is contained in:
Derek McGowan
2016-07-11 16:48:08 -07:00
parent dac465995a
commit a5531ff991
2 changed files with 46 additions and 1 deletions
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components/engine/docs/reference/commandline/dockerd.md
+11
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@@ -566,6 +566,17 @@ options for `zfs` start with `zfs` and options for `btrfs` start with `btrfs`.
Example use:
$ docker daemon -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.
## Docker runtime execution options
The Docker daemon relies on a