Hi@akhtar,
Follow the below steps to install OpenStack.
- IP of the system should be static. Go through the below link to know how to create static IP.
 
    https://www.edureka.co/community/63672/how-to-set-static-ip-in-linux-redhat?show=64169#a64169
   $ systemctl stop firewalld
   $ systemctl stop NetworkManager
   $ yum install -y 
   $ yum install -y openstack-packstack
   $ packstack --gen-answer-file=/root/answer.txt
      $ packstack --answer-file /root/answer.txt
After running the command it will take approx 30-40 mins to install and you will get successfully installed notification in your command line.
Hope it will help you.
Thank You