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Linux User Management: Working with Secondary Groups

Often, Linux users require membership to multiple groups to gain the access required on the system. In this lab exercise, we will create two new groups, and create three users with access to both groups. We will then create two directories and files within them to ensure all users have read/write access to both directories.

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Path Info

Level
Clock icon Beginner
Duration
Clock icon 30m
Last updated
Clock icon Apr 07, 2025

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Table of Contents

  1. Challenge

    Create the appadm Group with GID 30000 and the dba Group with GID 40000 

    # groupadd -g 30000 appadm
# groupadd -g 40000 dba

  2. Challenge

    Create Users user1, user2, and user3 with a Primary Group of appadm and a Secondary Group of dba 

    # useradd -g appadm -G dba user1
# useradd -g appadm -G dba user2
# useradd -g appadm -G dba user3

  3. Challenge

    Create the /app Directory and Give the appadm Group Read/Write Access, Then Create the /db Directory and Give the dba Group Read/Write Access 

    # mkdir /app
# chgrp app/adm /app
# chmod 760 /app
# mkdir /db
# chgrp dba /db
# chmod 760 /db

  4. Challenge

    Create the File /app/adm/app1.conf Containing the Comment “This file is reserved for application configuration.” and Grant the appadm Group Read/Write Permission to the File 

    # echo “This file is reserved for application configuration.” > /app/app1.conf
# chgrp appadm /app/app1.conf
# chmod 760 /app/app1.conf

  5. Challenge

    Create a File Named /db/db1.conf Containing the Comment, "This file is reserved for database configuration." Grant the dba Group Read/Write Access to the File 

    # echo "This file is reserved for database configuration." > /db/db1.conf
# chgrp dba /db/db1.conf
# chmod 760 /db/db1.conf
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