overlayfs: add --storage-driver doc
@@ -156,7 +156,7 @@ string is equivalent to setting the `--tlsverify` flag. The following are equiva
### Daemon storage-driver option
The Docker daemon has support for three different image layer storage drivers: `aufs`,
-`devicemapper`, and `btrfs`.
+`devicemapper`, `btrfs` and `overlayfs`.
The `aufs` driver is the oldest, but is based on a Linux kernel patch-set that
is unlikely to be merged into the main kernel. These are also known to cause some
@@ -175,6 +175,9 @@ To tell the Docker daemon to use `devicemapper`, use
The `btrfs` driver is very fast for `docker build` - but like `devicemapper` does not
share executable memory between devices. Use `docker -d -s btrfs -g /mnt/btrfs_partition`.
+The `overlayfs` is a very fast union filesystem. It is now merged in the main
+Linux kernel as of [3.18.0](https://lkml.org/lkml/2014/10/26/137).
+Call `docker -d -s overlayfs` to use it.
### Docker exec-driver option
