When a new version of a distro comes out I like to build a base VM image that I can use later to turn up new VMs quicker. Here are the steps I use on a CentOS or Fedora VM image:

1. Install minimal system via GUI
2. Install default packages
3. Setup Vim config
4. Disable/remove SELinux
5. Setup default bash prompt
6. Remove SSH keys
7. rm /etc/ssh/*key*
8. New keys will be generated on boot
9. Set generic hostname
   1. echo new-virt.web-ster.com > /etc/hostname
10. Remove mac address line from network config
11. Replace chrony with NTPd
    1. yum -y swap chrony ntp
12. Enable NTPd
13. Disable firewalld
    1. systemctl mask firewalld
14. Set grub default boot time to two seconds
    1. perl -pi -e 's/GRUB_TIMEOUT=\d/GRUB_TIMEOUT=2/' /etc/default/grub
    2. grub2-mkconfig -o /boot/grub2/grub.cfg
15. Shutdown VM and archive the disk image