Server hardening’s core principle is, “unnecessary functionality compromises security.” Adopting Linux should greatly simplify the process. No matter which flavor of Linux you choose to run, hardening your servers should be the same process; once you know one, you know them all. When it comes to Oracle Linux Server Hardening, what works for Red Hat or CentOS should continue to work. In theory, yes, but in practice, there are significant differences that could make or break your project.