Hi, as I known, there was no configuration option of adding DNS server on curent FusionCube verson.
If you wanna to access FusionCube Center via FQDN, I have a idea. if you have a external DNS server, kindly following my steps.
1.Adding the A record matched with FusionCube center server in your DNS server first.
2.Using user fc2 to log in FusionCube Center VM via CLI mode, then change to root account.
3.Adding the new DNS server to configuration file, command: echo "nameserver 192.168.10.11" >> /etc/resolv.conf (the address 192.168.10.11 is IP of my DNS server)
4.Verification via nsloop command. if it's able correctly resolve existed domain name, so it means it's working.
5.repeat these operation on standby node of FusionCube Center VM.
6.try to open your browser, to access FusionCube Center via FQDN.