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Merge pull request #9223 from vbatts/vbatts-overlay_notfound

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overlayfs: more helpful output when not supported
This commit is contained in:
Jessie Frazelle 2014-11-21 19:58:01 -08:00
commit c59b308b6b
2 changed files with 5 additions and 1 deletions
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1
daemon/graphdriver/overlayfs/overlayfs.go
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@ -129,6 +129,7 @@ func supportsOverlayfs() error {
return nil
}
}
log.Error("'overlayfs' not found as a supported filesystem on this host. Please ensure kernel is new enough and has overlayfs support loaded.")
return graphdriver.ErrNotSupported
}

5
docs/sources/reference/commandline/cli.md
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@ -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