May 22, 2026 | Advanced Linux Scripting, Learn Linux in practical way
Tired of “untrusted certificate” warnings in your email client? Replace iRedMail’s self-signed SSL certificates with free Let’s Encrypt certificates. Step-by-step guide for Rocky Linux, Ubuntu, and more. You’ve just set up iRedMail and...
May 22, 2026 | Advanced Linux Scripting, Learn Linux in practical way
You’ve just set up iRedMail, configured your domains, and created email accounts. Everything seems perfect until you try to send an email from your desktop client. Instead of a sent confirmation, you’re staring at an error message in your mail logs:...
May 22, 2026 | Advanced Linux Scripting, Learn Linux in practical way
Introduction iRedMail is a powerful open-source mail server solution that comes with self-signed SSL certificates by default. While self-signed certificates work, they trigger security warnings in email clients like Apple Mail, Outlook, and Thunderbird. This tutorial...
Apr 21, 2026 | Advanced Linux Scripting, Learn Linux in practical way
Essential Examples for System Administrators (Bridge, VLAN, and SSH Safety) NetworkManager’s command-line tool nmcli is a powerful utility for managing network connections on Linux servers. For system administrators, mastering nmcli is essential—it allows you to...
Apr 8, 2026 | Learn Linux in practical way
Introduction Managing firewall rules through Plesk’s web interface is straightforward, but there are times when you only have SSH access to your server. Whether you’re troubleshooting a lockdown situation, automating server configuration, or simply prefer...
Mar 5, 2026 | Learn Linux in practical way
Are you a cybersecurity enthusiast or penetration tester looking to run Kali Linux directly on your Mac hardware? While virtual machines are convenient, nothing beats the performance of a bare-metal installation. This comprehensive guide will walk you through...
Mar 2, 2026 | Advanced Linux Scripting
How to Set Up a Professional Daily Server Report with HTML Email on Rocky Linux 8/9/10 As a system administrator, staying on top of your server’s health is crucial. In this comprehensive guide, I’ll show you how to create a fully automated daily server...
Mar 2, 2026 | Advanced Linux Scripting
Introduction Changing laptops is exciting, but it comes with a critical task: migrating your SSH keys. These keys are your digital identity—they grant you access to servers, GitHub, AWS, and countless other services. Lose them, and you’ll be locked out of...
Mar 2, 2026 | Advanced Linux Scripting
Introduction Secure Shell (SSH) is the backbone of secure remote server administration. Whether you’re managing a single VPS or a fleet of cloud servers, SSH keys provide the cryptographic foundation for authentication. However, one of the most common mistakes I...
Mar 2, 2026 | Advanced Linux Scripting
In today’s threat landscape, security compliance isn’t optional—it’s essential. Whether you’re running a single server or managing an enterprise infrastructure, knowing your security posture is the first step toward protecting your systems. Two...
