Managing Linux user accounts and passwords is a routine task for many system administrators. In this lab, students are required to resolve a series of login issues for the users in the `app` group by checking the authentication logs as well as the `/etc/passwd` and `/etc/shadow` files.
Learning Objectives
Successfully complete this lab by achieving the following learning objectives:
- List the Users in the app Group, Then Verify the User Configuration in the /etc/passwd and /etc/shadow Files
# grep app /etc/group # grep <GID> /etc/passwd # grep user* /etc/shadow- The Double Exclamation Points (!!) in the Password Field of /etc/shadow Indicates That user1 Has Never Had a Password Set, so Set the Password for user1
# passwd user1- The 0 in the 8th Field of the /etc/shadow File for user2 Indicates that Account Has Expired and Needs to Be Unlocked
# chage -E -1 user2- The Configuration for user3 Is Missing from the /etc/shadow File, so Recreate the shadow File with the pwconv Command
# pwconv- Verify That All Users Can Log into the System
# ssh user1@<LabServerIP> password: # exit# ssh user2@<LabServerIP> password: # exit# ssh user3@<LabServerIP> password: # exit
