distribution/docs/storage-drivers/rados.md
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Signed-off-by: Mary Anthony <mary@docker.com>
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<!--[metadata]>
+++
title = "Ceph RADOS storage driver"
description = "Explains how to use the Ceph RADOS storage driver"
keywords = ["registry, service, driver, images, storage, ceph, rados"]
+++
<![end-metadata]-->
# 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