Linux User & Group Management + sudo — Complete Admin Guide
Every Linux server has human admins, deploy users, database accounts, and service identities. Mismanaged users are a se…
Linux Tutorial
Linux LVM Complete Guide — Create, Extend, and Resize Volumes (RHEL & Ubuntu)
Disk space runs out on production servers — databases grow, logs fill /var , upload directories expand. With LVM (Logica…
Nginx Reverse Proxy with Let's Encrypt SSL — Complete Production Guide
Running multiple web apps on one server — Node.js on port 3000, a Python API on 8080, a static site on 9000 — is normal…
How to Install Docker on AlmaLinux and Ubuntu (Production Setup Guide)
Docker packages applications with their dependencies into containers — isolated, portable, and consistent from laptop t…
rsync Backups on Linux — Complete Guide (Local, Remote SSH & Automation)
Every Linux server needs backups. rsync is the standard tool for incremental file sync — copy only what changed, over l…
How to Use journalctl on Linux — Read, Filter and Troubleshoot System Logs
When a Linux service crashes, fails to start, or behaves oddly, the answer is almost always in the logs. On modern dist…
SSH Key Authentication on Linux — Complete Setup Guide (Ed25519)
Password-based SSH login is the #1 way Linux servers get compromised. Bots guess thousands of combinations per hour; on…
SSH Hardening Checklist for Linux: Keys, No Root, Custom Port, AllowUsers
SSH is the front door to every Linux server. It is also the most attacked service on the internet — bots scan port 22 c…
Remove and Disable ABRT on RHEL 8 — Complete Security Hardening Guide
ABRT (Automatic Bug Reporting Tool) was designed to collect crash dumps and send them to bug trackers. On RHEL 8 and Fe…
How to Patch the Linux Kernel Safely on RHEL and Ubuntu (Production Guide)
Kernel vulnerabilities are among the most dangerous findings in a security audit. A single unpatched local privilege es…
Linux Firewall Basics: ufw vs firewalld — Complete Quick-Start Guide
Every Linux server exposed to the internet needs a firewall. Without one, every service listening on a port is reachabl…
Detect SSH Brute-Force Attacks on Linux (auth.log + fail2ban) — Complete Guide
Port 22 is scanned constantly. Bots hammer every public Linux server with thousands of password guesses per hour. If pa…
Proxmox VE vs VMware ESXi: Complete Install Guide (Bare Metal, Step-by-Step)
This long-form guide covers two enterprise hypervisors side by side: Proxmox VE (open-source, KVM + LXC) and VMware ESX…
How To Install cPanel / WHM on AlmaLinux 9 (Complete Step-by-Step Guide)
This is a complete, production-style guide to install cPanel & WHM on a fresh AlmaLinux 9 VPS or dedicated server. …