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engine: add recursive bind mounts 

Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>
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David Karlsson 2023-11-14 14:47:15 +01:00
parent 4e3143d6cc
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content/storage/bind-mounts.md
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@ -266,6 +266,30 @@ $ docker container stop devtest
$ docker container rm devtest
```
## Recursive mounts
When you bind mount a path that itself contains mounts, those submounts are
also included in the bind mount by default. This behavior is configurable,
using the `bind-recursive` option for `--mount`. This option is only supported
with the `--mount` flag, not with `-v` or `--volume`.
If the bind mount is read-only, the Docker Engine makes a best-effort attempt
at making the submounts read-only as well. This is referred to as recursive
read-only mounts. Recursive read-only mounts require Linux kernel version 5.12
or later. If you're running an older kernel version, submounts are
automatically mounted as read-write by default. Attempting to set submounts to
be read-only on a kernel version earlier than 5.12, using the
`bind-recursive=readonly` option, results in an error.
Supported values for the `bind-recursive` option are:
| Value | Description |
|:--------------------|:------------------------------------------------------------------------------------------------------------------|
| `enabled` (default) | Read-only mounts are made recursively read-only if kernel is v5.12 or later. Otherwise, submounts are read-write. |
| `disabled` | Submounts are ignored (not included in the bind mount). |
| `writable` | Submounts are read-write. |
| `readonly` | Submounts are read-only. Requires kernel v5.12 or later. |
## Configure bind propagation
Bind propagation defaults to `rprivate` for both bind mounts and volumes. It is