Allow user to enable Rescue Mode of VM through UI. Would help with recovery and other actions if VM is in a locked out state.
nova rescue [SERVER] --image [IMAGEID]
Rescue mode is when you set an instance through NOVA to boot from a rescue image. This is meant to allow you to recover your instance from a major problem at the OS root level. The basic concept of this is when you put an instance in rescue mode it will do a soft reboot of the instance and boot to the rescue image. This by default is specified in your openstack configuration. If you want to boot to a specific image you need to use the –image flag and the image_id of your selected image.