It wouldn't be a CDrom it would be considered an ISO. You would need to turn a CD into an ISO locally, then upload the ISO as an image to OpenStack, then you could install the image into a volume and attach the volume to your instance.

FYI this is not the way you want to be using the cloud. You need to be creating custom images that make use of cloud-init to pull metadata about how to configure the instance.

You'll have to:

• Create the ISO image on your local computer (here, running linux)

sudo dd if=/dev/cdrom of=/tmp/cd.iso

• Upload that image file (/tmp/cd.iso) to your running VM (to /tmp/cd.iso too, for example)

• Mount it locally

mount /tmp/cd.iso /mnt -t iso9660 -o loop

And the content of your CDROM should be accessible in /mnt...