Please check MAC address for public and internal cards
Master
Hostname: master
enp0s3: private(internal) network 192.168.1.254
enp0s8: public network 192.168.11.6
Compute1
Hostname: c1
enp0s3: private network 192.168.1.253 MAC 08:00:27:99:b3:4f
# vi /etc/hosts
192.168.1.254 master
hostnamectl set-hostname master
# systemctl disable firewalld
# systemctl stop firewalld
# vi /etc/selinux/config
SELINUX=disabled
# reboot
# yum -y update