For "ironic node-create" , what are the values that has to be given for "pxe_deploy_kernel" and "pxe_deploy_ramdisk"?

It was given that: ----- 'pxe_deploy_kernel': _("UUID (from Glance) of the deployment kernel. " and ------'pxe_deploy_ramdisk': _("UUID (from Glance) of the ramdisk that is mounted at boot time. Required.")"

is there any command to get possible values of 'pxe_deploy_kernel' & 'pxe_deploy_ramdisk'? Thanks a lot in advance.