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Merge pull request #9223 from vbatts/vbatts-overlay_notfound 

overlayfs: more helpful output when not supported
This commit is contained in:
Jessie Frazelle 2014-11-21 19:58:01 -08:00
parent d7626e97b6 cb57c38848
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 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 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 ### Daemon storage-driver option
The Docker daemon has support for three different image layer storage drivers: `aufs`, 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 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 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 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`. 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 ### Docker exec-driver option