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docs: add note to volume-plugins 

The /var/lib/docker directory is reserved for
docker, and should not be touched by plugins.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2016-01-04 15:42:03 +01:00 committed by Tibor Vass
parent b65475f61a
commit d8f50e5dd1
1 changed files with 7 additions and 3 deletions
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10
docs/extend/plugins_volume.md
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@ -15,7 +15,7 @@ storage systems, such as Amazon EBS, and enable data volumes to persist beyond
the lifetime of a single Docker host. See the [plugin documentation](plugins.md)
for more information.
# Command-line changes
## Command-line changes
A volume plugin makes use of the `-v`and `--volume-driver` flag on the `docker run` command. The `-v` flag accepts a volume name and the `--volume-driver` flag a driver type, for example:
@ -32,13 +32,13 @@ server to another.
By specifying a `volumedriver` in conjunction with a `volumename`, users can use plugins such as [Flocker](https://clusterhq.com/docker-plugin/) to manage volumes external to a single host, such as those on EBS.
# Create a VolumeDriver
## Create a VolumeDriver
The container creation endpoint (`/containers/create`) accepts a `VolumeDriver`
field of type `string` allowing to specify the name of the driver. It's default
value of `"local"` (the default driver for local volumes).
# Volume plugin protocol
## Volume plugin protocol
If a plugin registers itself as a `VolumeDriver` when activated, then it is
expected to provide writeable paths on the host filesystem for the Docker
@ -47,6 +47,10 @@ daemon to provide to containers to consume.
The Docker daemon handles bind-mounting the provided paths into user
containers.
> **Note**: Volume plugins should *not* write data to the `/var/lib/docker/`
> directory, including `/var/lib/docker/volumes`. The `/var/lib/docker/`
> directory is reserved for Docker.
### /VolumeDriver.Create
**Request**: