Mastering Linux Security and Hardening

Method 2 – creating an entry in the sudo policy file

Okay, adding users to either the wheel group or the sudo group works great if you're either just working with a single machine or if you're deploying a sudo policy across a network that uses just one of these two admin groups. But what if you want to deploy a sudo policy across a network with a mixed group of both Red Hat and Ubuntu machines? Or what if you don't want to go around to each machine to add users to an admin group? Then, just create an entry in the sudo policy file. You can either create an entry for an individual user or create a user alias. If you do sudo visudo on your CentOS virtual machine, you'll see a commented-out example of a user alias:

# User_Alias ADMINS = jsmith, ...