I used kolla 5.0.0 to deploy openstack on one control node and one compute node both running Centos 7. Everything seems to work well but the ssh login just takes too long. It takes almost a whole minute to log me into a vm on openstack. People have suggested it could be related to DNS so I have tried things like changing the option UseDNS to equal "no" in /etc/ssh/sshd_config ON the vm's. I also tried setting GSSAPIAuthentication to "no" in /etc/ssh/sshd_config on the vm's and restarted the sshd but these suggestions did not help anything.