Hardware virtualized (HVM) instances created with a CDROM fail to boot on Oracle VM Server. Paravirtualized (PV), and hardware virtualized with paravirtualized drivers (PVHVM) instances are not affected, and boot with the CDROM.
Workaround: Set the
hw_cdrom_bus=xen
property on the image, for
example:
$ glance image-update --property hw_cdrom_bus=xen image_id
Bug: 23195986