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User accounts
In order to login to a system a user has to authenticate with his/her credentials:
user name and password.
Authentication types:
local (password/shadow/group) and
Domain based (NIS, Kerberos, LDAP).
For local authentication, a user should have an account on the system.
Entry in /etc/passwd:
mike:x:1001:1001:Michael Whites:/home/mike:/bin/bash
Entry in /etc/shadow:
mike:$1$zXCV7fz8ii84grbZhj:14087:0:99999:7:::
Entry in /etc/group:
mike:x:1001:mike
admin:x:112:hostadm,mike
Accounts can be created only by a superuser (root).
Commands to create user accounts:
adduser (interactive command)
useradd (can be included in a script).
Exercise
Create a new user account by following the instructor.
Become root:
Create a new user account, mike
Verify the account existence:
Change password of the user
Reference: User accounts and Ownerships
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