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Linux User Management: Troubleshooting Login Issues
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.
Table of Contents
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
Verify That All Users Can Log into the System
# ssh user1@<LabServerIP> password: # exit
# ssh user2@<LabServerIP> password: # exit
# ssh user3@<LabServerIP> password: # exit
What's a lab?
Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.