Linux User Management: Configuring Sudo

15 minutes
  • 6 Learning Objectives

About this Hands-on Lab

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.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Create userA and userB with the wheel Group as Their Secondary Group
# useradd -G wheel userA
# useradd -G wheel userB
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
Verify All Users Are Part of the wheel Group
# groups userA userB ec2-user
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
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
    Password:
 # passwd userB
    Password:
 # grep ec2-user /etc/shadow
 # passwd ec2-user
    Password:
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

Additional Resources

sudo provides a secure way for users to run commands with elevated access. In this lab, students will learn to add users to the system and configure sudo to enable the user to run all system commands as root.

In order to complete this lab, students must first log in to the lab environment with the cloud_user and issue sudo -i to gain root access. This is required to add new users to the system and configure sudo.

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