Red Hat Enterprise Linux 7 is a multi-user operating system, which enables multiple users on different computers to access a single system installed on one machine. Every user operates under its own account, and managing user accounts thus represents a core element of Red Hat Enterprise Linux system administration.
Normal and System Accounts
Normal accounts are created for users of a particular system. Such accounts can be added, removed, and modified during normal system administration.
System accounts represent a particular applications identifier on a system. Such accounts are generally added or manipulated only at software installation time, and they are not modified later.
System accounts are presumed to be available locally on a system. If these accounts are configured and provided remotely, such as in the instance of an LDAP configuration, system breakage and service start failures can occur.
For system accounts, user IDs below 1000 are reserved. For normal accounts, you can use IDs starting at 1000. However, the recommended practice is to assign IDs starting at 5000. See Section 4.1, “Introduction to Users and Groups”
for more information. The guidelines for assigning IDs can be found in the
# Min/max values for automatic uid selection in useradd
# System accounts
What Groups Are and Which Purposes They Can Be Used For
A group is an entity which ties together multiple user accounts for a common purpose, such as granting access to particular files.
1.7.2. Managing User Accounts in Cockpit
To manage accounts in Cockpit, select the menu.
Figure 1.4. Managing User Accounts in Cockpit