Usernames and Access

I have noticed that there is a number of usernames that are reserved by CentOS / NS, I suspect that these names / ID are also PAM users (such as games, mail and nobody).

Could somebody give a definite list of such users (based on a default CentOS / NS install).

The shell command

getent passwd

lists all users of the system. The list depends on the installed modules. General rules:

  • Low uid (< 100) elements come from CentOS,
  • system uids < 500 are reserved to services
  • admin is 500
  • user accounts start from uid 5000
  • samba AD idmap start at 50000