CentOS Linux Security

CentOS Add Users to Sudoers

In the case of any Linux system, there’s a very powerful user – the “root”. It upholds the ULTIMATE power over the entire system, even modifying data at the hardware level! That’s why it’s so delicate and dangerous at the same time. Without the “root” access, hackers are forced to follow a trickier and more difficult path for taking over the system.The “root” privilege is responsible for performing all the actions that modifies the system files and packages. That’s why in the enterprise/professional workspace, not all users are allowed to run commands as they wish.

CentOS also comes up with a similar policy. It only allows a certain users to perform actions with the “root” privilege. For example, whenever you run any command with the “sudo” command, you’ll get the following error –

For fixing the issue, the user account must be in the “sudoers” file. In this tutorial, we’ll check out on adding a user into the “sudoers” file.

Adding users to the “sudoers”

The trick here is NOT directly editing the “/etc/sudoers” file. Instead, we’ll be adding the specific user into the “wheel” group. In the case of CentOS, all the users in the group have the ability of running “sudo” commands and that’s the easier and safer way.

This is also proven within the “/etc/sudoers” file –

Optional – creating a new user

I’m going to create a new user for the “sudo” purpose only. Don’t worry; you can easily add the existing user.

Enter the “root” mode –

su -

Now, create a new user –

adduser <username>

Time to add a password for the newly created username –

passwd <username>

It’s finally time to add the user “Yasuo” on the “wheel” group. At first, make sure that you’re logged as the “root” –

su -

Now, perform the final action –

usermod -aG wheel <username>

Everything is set!

Testing the outcome

Well, it’s always worth testing the outcome, no matter how obvious it may seem. Let’s try out running a “sudo” command as “Yasuo” –

su - Yasuo

sudo yum update

Voila! “Yasuo” is now a privileged user account capable of “sudo”!

About the author

Sidratul Muntaha

Sidratul Muntaha

Student of CSE. I love Linux and playing with tech and gadgets. I use both Ubuntu and Linux Mint.