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Create a Sudo User on CentOS - How to do it ?

This article covers how to create a user with sudo privileges. You can now log in to your CentOS server with this user account and use sudo to run administrative commands.

Performing server administration as a non-root user is a best practice.

For security, your first task when deploying a CentOS instance is to create a non-root user with sudo access.


How to Add a New User Account on CentOS Linux System ?

1. To Create a new user account with the adduser command:

# adduser example_user

2. Set a strong password for the new user (new_user) with passwd.

# passwd new_user


Add Swap Space on Ubuntu 20.04 - Step by Step Process ?

This article covers how we can add and maintain swap space in the ubuntu system. Swap space can take the form of either a dedicated swap partition or a swap file. Typically, when running Ubuntu on a virtual machine, a swap partition is not present, and the only option is to create a swap file.


To Adjust the Swappiness Value:

Swappiness is a Linux kernel property that defines how often the system will use the swap space. It can have a value between 0 and 100. A low value will make the kernel to try to avoid swapping whenever possible, while a higher value will make the kernel to use the swap space more aggressively.

On Ubuntu, the default swappiness value is set to 60. You can check the current value by typing the following command:

$ cat /proc/sys/vm/swappiness


To Remove a Swap File:

1. First, deactivate the swap space:

$ sudo swapoff -v /swapfile

2. Next, remove the swap file entry /swapfile swap swap defaults 0 0 from the /etc/fstab file.

3. Finally, remove the actual swapfile file using the rm command:

$ sudo rm /swapfile



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