When you say you deployed 'Rancher' via a docker image, I am going to assume you installed the Rancher Manager docker image which includes a kubernetes in docker type of screwy setup. Please see the wonderful help provided to
@miniature-ambulance-98143 above to help navigate the spaghetti noodle mess that is SUSE + Rancher Labs at the moment.
This is also a great starting point for most of what is SUSE/Rancher
https://github.com/SUSE/suse-at-home