From further investigation I have found that nova-docker does send the request to Glance, and all of the HTTP requests respond with 200 OK.
However the image being pulled from glance is not being loaded into Docker as an image. I gather from this that nova-docker once all of the steps have been completed it performs a docker run <image name>, but as the image is not loaded into Docker itself it is unable to run the image.
From further investigation I have found that nova-docker does send the request to Glance, and all of the HTTP requests respond with 200 OK.
However the image being pulled from glance is not being loaded into Docker as an image. I gather from this that nova-docker once all of the steps have been completed it performs a docker run <image name>, but as the image is not loaded into Docker itself it is unable to run the image.