On 07/26/2015 07:39 PM, Zhenyu Zheng wrote:
Hi all,
Recently, I've been asked to perform this kind of action using OpenStack:
1. Launch an volume-backended instance.
2. Take a snapshot of this instance using nova image-create, an image will be
added in glance, the size is zero, and the BDM will be saved in it's metadata.
3. Create an volume using this image (with Cinder), This volume will be marked
with bootable.
4. Launch an new volume-backended instance using this newly built volume.
There will be errors performing this action:
1. Cinder will create an volume with zero size and the BDM saved in metadata is
transformed from dict to string and it is not able to be used in nova for
instance creation.
2. The BDM is provided by user with REST API, and it will be conflict with the
BDM saved in metadata.
Now, my question is:
Should we allow this kind of action in Nova? Or should we only use the image
directly for instance creation.
If this kind of action is not allowed, should we add checks in Cinder to forbid
volume creation with an zero-sized image?
If we're going to allow snapshotting a boot-from-volume instance, then I think
we should make it a "proper" image that can be used for any purpose that a
regular image can be used.
Chris
__________________________________________________________________________
OpenStack Development Mailing List (not for usage questions)
Unsubscribe: [email protected]?subject:unsubscribe
http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
