# Ceph RADOS storage driver An implementation of the `storagedriver.StorageDriver` interface which uses [Ceph RADOS Object Storage][rados] for storage backend. ## Parameters The following parameters must be used to configure the storage driver (case-sensitive): * `poolname`: Name of the Ceph pool * `username` *optional*: The user to connect as (i.e. admin, not client.admin) * `chunksize` *optional*: Size of the written RADOS objects. Default value is 4MB (4194304). This drivers loads the [Ceph client configuration][rados-config] from the following regular paths (the first found is used): * `$CEPH_CONF` (environment variable) * `/etc/ceph/ceph.conf` * `~/.ceph/config` * `ceph.conf` (in the current working directory) ## Developing To include this driver when building Docker Distribution, use the build tag `include_rados`. Please see the [building documentation][building] for details. [rados]: http://ceph.com/docs/master/rados/ [rados-config]: http://ceph.com/docs/master/rados/configuration/ceph-conf/ [building]: https://github.com/docker/distribution/blob/master/docs/building.md#optional-build-tags