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Linux User Management: Configuring Sudo

The `sudo` command, which stands for "super-user do" allows users to run commands with elevated access as the `root` user, or as another user. In this lab, students will learn to add a new user to the system, and configure `sudo` to allow the user to run commands as the super-user.

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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

    Create userA and userB with the wheel Group as Their Secondary Group

    # useradd -G wheel userA
    # useradd -G wheel userB
  2. Challenge

    Add the wheel Group as a Secondary Group for the ec2-user. Since This User Is Already Configured on the System, Make Sure to Append the New Secondary Group as to Not Overwrite Prior Existing Secondary Groups

    # usermod -aG wheel ec2-user
  3. Challenge

    Verify All Users Are Part of the wheel Group

    # groups userA userB ec2-user
  4. Challenge

    Configure the wheel Group in /etc/sudoers. Since This Is Configured by Default to Provide Users in the wheel Group with root Access for All Commands, No Action Is Needed. Just Verify the Wheel Entry Exists and Is Uncommented

    # visudo
  5. Challenge

    Set the Password for userA and userB. Grep ec2-user from the /etc/shadow File and if a Password isn't Set, then Set One.

    # passwd userA
    # passwd userB
    # grep ec2-user /etc/shadow
    # passwd ec2-user
  6. Challenge

    Switch to Each User and Verify sudo Commands Are Executed by root

    # su - userA
    $ sudo whoami
    $ exit
    # su - userB
    $ sudo whoami
    $ exit
    # su - ec2-user
    $ sudo whoami
    $ exit

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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.

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We will provide the credentials and environment necessary for you to practice right within your browser.

Guided walkthrough

Follow along with the author’s guided walkthrough and build something new in your provided environment!

Did you know?

On average, you retain 75% more of your learning if you get time for practice.

Start learning by doing today

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