Fqdn missing in Zookeeper stack

I just installed zookeeper from Rancher catalog, and noticed that FQDN is not set.
I have a working External DNS service, and all other services are gaining a proper fqdn…

Is there any way to force a FQDN for a zookeeper stack?

Rancher v1.1.4 here.

Just realized that I needed add a port in order for a service to gain a fqdn.
Everything is working properly now.