Yes I gave a look but Rancher is so much more different than a regular distribution, even CoreOS. The problem is everything on system is container, I can't install something by default even manually (using the tar.gz) because when you are login, you are in a BusyBox container in some way...
IMHO, I don't think the Citrix tools has been design to run in a container (even privileged) and to retrieve information for the entire system that is also in a container... What a mess right ? 😂
But in the end, these kind of Docker-ready OSes start giving me headache, even CoreOS now is not working like it was in the past, the fault of a very fast-paced developement from the CoreOS devs, the outdated documentation since they has been buyed by Red Hat (they move to Fedora CoreOS with lot of changes), and Citrix who seems to not giving much interest in CoreOS support.