All nodes in the cluster are configured for DNS and Reverse DNS but still hosts are not added to the Ambari.
I have changed ambari-agent.ini file to point to ambari-server on all agents
iptables/ firewalld are stopped/disabled on all nodes
SELinux is disabled on all nodes
But I did not modify host entires in /etc/hosts file as DNS is configured. Previously when DNS was not configured we did modify host entires in /etc/hosts file and Ambari added hosts as expected.
What other checks or steps that I need to perform in order to ensure hosts are been added?