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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.

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Path Info

Clock icon Intermediate
Clock icon 15m
Clock icon Jan 31, 2020

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Table of Contents

  1. Challenge

    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
  2. Challenge

    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
  3. Challenge

    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
  4. Challenge

    The Configuration for user3 Is Missing from the /etc/shadow File, so Recreate the shadow File with the pwconv Command

    # pwconv
  5. Challenge

    Verify That All Users Can Log into the System

    # ssh user1@<LabServerIP>
    # exit
    # ssh user2@<LabServerIP>
    # exit
    # ssh user3@<LabServerIP>
    # exit

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