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Remove misleading generic storage driver instructions (#5619)

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Misty Stanley-Jones 2017-12-26 12:27:26 -08:00 committed by GitHub
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engine/userguide/storagedriver/selectadriver.md
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@ -200,15 +200,10 @@ storage drivers. Make sure to use equivalent hardware and workloads to match
production conditions, so you can see which storage driver offers the best
overall performance.
## Check and set your current storage driver
## Check your current storage driver
The detailed documentation for each individual storage driver details all of the
set-up steps to use a given storage driver. This is a very high-level summary of
how to change the storage driver.
> **Important**: Some storage driver types, such as `devicemapper`, `btrfs`, and
> `zfs`, require additional set-up at the operating system level before you can
> use them with Docker.
set-up steps to use a given storage driver.
To see what storage driver Docker is currently using, use `docker info` and look
for the `Storage Driver` line:
@ -223,35 +218,16 @@ Storage Driver: overlay
<output truncated>
```
To change the storage driver, see the specific instructions for the new storage
driver. Some drivers require additional configuration, including configuration
to physical or logical disks on the Docker host.
To set the storage driver, you can use the `--storage-driver` flag when starting
the Docker daemon manually, or (recommended) set the option in the `daemon.json`
file, which is located in `/etc/docker/` on Linux and
`C:\ProgramData\docker\config\` on Windows Server.
> **Note**: Using the `--storage-driver` flag when running `dockerd` manually or
> using an init script is not recommended. We recommend setting the option in
> the `daemon.json` file instead, because this mechanism is cross-platform,
> and will not create configuration conflicts with the default init scripts for
> your operating system.
Changing the storage driver on Docker for Mac or Docker for Windows is not
supported.
If the `daemon.json` file does not exist, create it. Assuming there are no other
settings in the file, it should have the following contents:
```json
{
"storage-driver": "devicemapper"
}
```
You can specify any valid storage driver in place of `devicemapper`.
Restart Docker for the changes to take effect. After restarting, run
`docker info` again to verify that the new storage driver is being used.
> **Important**: When you change the storage driver, any existing images and
> containers become inaccessible. This is because their layers cannot be used
> by the new storage driver. If you revert your changes, you will be able to
> access the old images and containers again, but any that you pulled or
> created using the new driver will then be inaccessible.
{:.important}
## Related information