CloneVolume


 * Launchpad Entry: NovaSpec:clone-volume
 * Created: 2011-4-19
 * Contributors: Kazutaka Morita

Summary
Create a new volume from a snapshot with the EC2 api

Release Note
This adds support for "--snapshot" option of euca-create-volume, and enable us to create a new volume from a existing snapshot volume.

Rationale
It is useful for hosting companies to create lots of same volumes from one golden snapshot.

User stories

 * User can create a same volume instantly from a golden snapshot.
 * User can create a new image from a backuped snapshot volume.

$ euca-describe-snapshots SNAPSHOT       snap-00000001   vol-00000001    available       2011-04-19T20:18:19Z    100% $ euca-create-volume -z 0 --snapshot snap-00000001 VOLUME vol-00000002    4       snap-00000001   creating (admin, None, None, None)      2011-04-19T20:53:46Z $ euca-describe-volumes VOLUME vol-00000001     4              nova    available (admin, lucid64, None, None)  2011-04-19T20:18:10Z VOLUME vol-00000002     4      snap-00000001   nova    available (admin, lucid64, None, None)  2011-04-19T20:53:46Z

Assumptions
A backend storage of nova-volume must support snapshotting.

Implementation
This adds a new column 'snapshot_id' to the table 'volumes' in the database

snapshot_id = Column('snapshot_id', Integer)