Cannot access WEB UI

Hi guys,

We have installed HDP 2.3 on a five node cluster via Ambari (cluster nodes are CentOS7 VMs, created via OpenStack client).
When we have tried to access web UI, the url is in the form http://(FQDN):port/…..
We do not have a DNS service available (configuration made via hosts files on the VMs).
Is there a way for Ambari to use IPs instead of FQDNs in the UI urls?

Thanks in advance

Massimiliano