If your running a headless version of CentOS, it is true that your saving a lot of space and CPU power just for not having an interface. If your server is in the cloud, your disk space may be limited and maintenance is required. We found this link helpful towards accomplishing the goal.
https://www.getpagespeed.com/server-setup/clear-disk-space-centos
If you have other tips, post them here, this forum appreciates your contributions.