snapshots return wrong UUID for image

[Erica Windisch]

Snapshots return the UUID of the image. Unfortunately, the UUID returned by the docker driver does not match the image created within glance.

When the driver uploads to the registry, it passes a HTTP header to the docker daemon which actually communicates to the registry. However, the docker daemon seems not to be forwarding that header to the registry, thus the registry uploads the image with a new ID, rather than using the one given to it from Nova.

[Peng Gu (gp-will)]

May be Docker Registry API should be used to resolve this problem. I suggest always use Docker Registry API instead of Docker Remote API when dealing with images.

[Erica Windisch (ewindisch)]

@gp-will that's a good suggestion. Actually, I believe this problem has been fixed in Docker itself, allowing the HTTP headers to pass-through. However, I've been working on a patch that would eliminate the registry as a proxy between docker and glance, allowing direct uploads to Glance.

[Erica Windisch (ewindisch)]

Resolved by moving to saving directly to Glance: https://github.com/stackforge/nova-docker/commit/53c0854dde375872e79cd80bc3d56a51abe737ac