nova boot --flavor 1 --block-device source=image,id=<image_id>,dest=volume,size=5,shutdown=preserve,bootindex=0 instance-volume-1
nova boot --flavor 1 --boot-volume <bootable_volume_id> cirros-vol-1
nova boot --flavor 1 --block-device source=image,id=<image_id>,dest=volume,size=5,shutdown=preserve,bootindex=0 instance-volume-1
nova boot --flavor 1 --boot-volume <bootable_volume_id> cirros-vol-1