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pgp signature

How to Verify PGP Signature of Downloaded Software on Linux

PGP (Pretty Good Privacy) is a public key cryptography software that can be used to encrypt and sign data communication.…

application security

10 Steps in Application Security Assessment

If you are a web-based company or even a company that uses the internet for any purpose, application security assessment…

WireGuard Mesh VPN Encryption for MariaDB Galera Cluster

WireGuard Mesh VPN Encryption for MariaDB Galera Cluster

This tutorial is going to show you how to build a WireGuard mesh VPN and use it to encrypt replication…

Upgrade Ubuntu 20.04 20.10 To 21.04

2 Ways to Upgrade Ubuntu 20.04/20.10 To 21.04 (GUI & Terminal)

Ubuntu 21.04, codenamed Hirsute Hippo, is released on April 22, 2021. This tutorial is going to you 2 ways to…

how to install suitecrm on ubuntu 20.04

How to Install SuiteCRM on Ubuntu 20.04 with Apache/Nginx

This tutorial will be showing you how to install SuiteCRM on Ubuntu 20.04 with Apache or Nginx web server. SuiteCRM…

how-to-install-mediawiki-on-ubuntu-20.04-lts

How to Install MediaWiki on Ubuntu 20.04 with Apache/Nginx

This tutorial is going to show you how to install MediaWiki on Ubuntu 20.04. MediaWiki is the backend software that…

install shlink on ubuntu_ self hosted url shortener

How to Install Shlink URL Shortener on Ubuntu 20.04 Server

Shlink is an open-source self-hosted URL shortener, which allows you to shorten URLs and serve them under your own short…

How to Use Clonezilla Live to Back Up Your Hard Drive

How to Use Clonezilla Live to Back Up Your Hard Drive

This tutorial is going to show you how to use Clonezilla Live to back up your hard drive. Clonezilla is…

how to encrypt dropbox on ubuntu

2 Ways to Encrypt Dropbox Files on Ubuntu Desktop & Server

If you are wondering “is Dropbox safe for confidential files”, you have come to the right place. This tutorial shows…

Install ProjectSend on Ubuntu 20.04 with Nginx (LEMP Stack)

Install ProjectSend on Ubuntu 20.04 with Nginx (LEMP Stack)

This tutorial will be showing you how to install ProjectSend on Ubuntu 20.04 LTS with Nginx web server. What’s ProjectSend?…

2 Ways to Upgrade Nextcloud [Command-Line & GUI]

2 Ways to Upgrade Nextcloud [Command-Line & GUI]

It’s important to keep your Nextcloud server up to date with the latest security and bug fixes. This tutorial is…

Set Up Authoritative DNS Servers with Webmin

How to Set Up Authoritative DNS Servers with Webmin

In previous tutorials, we explained how to set up authoritative DNS servers and edit DNS records from the command line.…

How to Create DNS Records at Cloudflare

How to Create DNS Records at Cloudflare

In my mail server tutorials, I recommend running mail server on ScalaHosting VPS, because their IP addresses are not on…

Install Webmin on CentOS 8 RHEL 8 Server

How to Install Webmin on CentOS 8/RHEL 8 Server

Webmin is a free and open-source control panel for administering Unix/Linux servers. This tutorial will be showing you how to…

How to Install Webmin on Ubuntu 20.04 Server

How to Install Webmin on Ubuntu 20.04 Server

Webmin is a free and open-source control panel for administering Unix/Linux servers. This tutorial will be showing you how to…

How to Fix “can’t read superblock” Error on Linux (ext4 & Btrfs)

Recently my Linux desktop computer can’t mount my 5TB external hard disk drive (HDD), and the file manager displays the…

How to Create a Linux VPS Server on ScalaHosting

How to Create a Linux VPS Server on ScalaHosting

ScalaHosting is my recommended VPS (Virtual Private Server) provider for running email servers. This article is going to explain how…

Secure Email Server Against Hacking

How to Secure Email Server Against Hacking with VPN (CentOS/RHEL)

In this tutorial, I’m going to share with you my tips and tricks to secure CentOS/RHEL email servers against hacking…

Set Up SSH Two-Factor Authentication (2FA) on CentOS RHEL Server

Set Up SSH Two-Factor Authentication (2FA) on CentOS/RHEL Server

This tutorial will show you how to set up SSH two-factor authentication on CentOS/RHEL server using the well-known Google Authenticator.…

centos ssh public key authentication

2 Simple Steps to Set Up SSH Public Key Authentication on CentOS

This tutorial explains how to set up SSH public key authentication on a CentOS/RHEL desktop. There’re basically two ways of…