Configuration manager help for clusters

[Mad, Pink and Dangerous to Know]

I have a small cluster setup. I need a for dummies guide to using a
configuration manager to change configurations. Don't care which one.
Can anyone give an example of how to: 

1. create a user "raspberry" 

2. create a role "friend" to user "raspberry"  

3. change the config for UUID's algorithm to "utc_random" 

Thanks in advance!