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distribution/docs/storage-drivers/rados.md
Vincent Giersch 394eea0231 Storage Driver: Ceph Object Storage (RADOS) 
This driver implements the storagedriver.StorageDriver interface and
uses Ceph Object Storage as storage backend.

Since RADOS is an object storage and no hierarchy notion, the
following convention is used to keep the filesystem notions stored in
this backend:

* All the objects data are stored with opaque UUID names prefixed
  (e.g. "blob:d3d232ff-ab3a-4046-9ab7-930228d4c164).
* All the hierarchy information are stored in rados omaps, where the
  omap object identifier is the virtual directory name, the keys in
  a specific are the relative filenames and the values the blob
  object identifier (or empty value for a sub directory).

  e.g. For the following hierarchy:

     /directory1
     /directory1/object1
     /directory1/object2
     /directory1/directory2/object3

  The omap "/directory1" will contains the following key / values:
    - "object1" "blob:d3d232ff-ab3a-4046-9ab7-930228d4c164"
    - "object2" "blob:db2e359d-4af0-4bfb-ba1d-d2fd029866a0"
    - "directory2" ""

  The omap "/directory1/directory2" will contains:
    - "object3" "blob:9ae2371c-81fc-4945-80ac-8bf7f566a5d9"

* The MOVE is implemented by changing the reference to a specific
  blob in its parent virtual directory omap.

This driver stripes rados objects to a fixed size (e.g. 4M). The idea
is to keep small objects (as done by RBD on the top of RADOS) that
will be easily synchronized accross OSDs. The information of the
original object (i.e total size of the chunks) is stored as a Xattr
in the first chunk object.

Signed-off-by: Vincent Giersch <vincent.giersch@ovh.net>
2015-05-20 01:44:34 +00:00

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Ceph RADOS storage driver

An implementation of the storagedriver.StorageDriver interface which uses Ceph RADOS Object Storage 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 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 for details.