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Virtualization tutorial - IT technology blog

3D Graphics Acceleration for KVM VMs: Forget GPU Passthrough, Just Use VirtIO-GPU!

By admin July 21, 2026

Stop letting your Linux VM crawl along at a snail's pace. This guide shows you how to enable 3D graphics acceleration with VirtIO-GPU and Virgil3D, boosting frame rates by 5x without any GPU Passthrough setup.

Ubuntu

Build Your Own Mail Server with iRedMail on Ubuntu 22.04: No More Workspace Fees

By admin July 21, 2026

Build a professional Mail Server with iRedMail on Ubuntu 22.04. Detailed guide on configuring DNS, DKIM, DMARC, and SSL to ensure your emails reach the inbox.

Centos

How to Join CentOS Stream 9 to Windows Active Directory using SSSD and Realmd

By admin July 21, 2026

A detailed guide on joining CentOS Stream 9 to Active Directory. A centralized, secure, and stable user management solution for Linux system engineers.

Development

React Hook Form + Zod: Building Type-Safe Form Validation in React and Next.js

By admin July 20, 2026

A guide to combining React Hook Form with Zod for type-safe form validation in React and Next.js. From defining Zod schemas and integrating zodResolver, to handling server-side errors and Server Actions — all with a single shared schema across client and server.

Git

BFG Repo-Cleaner Guide: Remove Sensitive Data and Shrink Your Git Repository at Lightning Speed

By admin July 20, 2026

BFG Repo-Cleaner lets you remove sensitive files, hardcoded passwords, and large files from your entire git history up to 720x faster than git filter-branch. This guide walks through real-world scenarios: removing .env files, stripping large blobs, replacing text, along with a safe verify and force push workflow.

Network

ethtool Linux: Check NIC Status, Configure Speed, and Optimize Network Interface Performance from the Command Line

By admin July 20, 2026

ethtool is the Linux command that shows you everything about your NIC that ip link can't — from actual speed/duplex and error counters to ring buffer and offloading. Includes a full-server NIC health check script and how to persist settings across reboots.

Network

Deploying Network Access Control with PacketFence: Controlling Internal Network Device Access with Security Policies

By admin July 20, 2026

A practical guide to deploying PacketFence for internal network access control: installation, 802.1X configuration with Cisco switches, Active Directory integration, monitoring, and handling IoT devices that don't support authentication. Real-world experience from a 50-person office environment.

Virtualization

Guide to Repairing QCOW2 Disk Errors with qemu-img: Recovering Proxmox/KVM Data After a Crash

By admin July 20, 2026

VM won't boot due to QCOW2 disk errors? Learn how to use qemu-img to check, repair, and rebuild virtual disk files to quickly recover critical data on Proxmox/KVM.

Centos

Installing OpenVPN on CentOS Stream 9: Enterprise-Grade Security with SELinux

By admin July 20, 2026

A production-ready guide to installing OpenVPN on CentOS Stream 9. Optimize security with AES-256-GCM, configure Firewalld, and manage SELinux without disabling it.

Ubuntu

Deploying Node.js on Ubuntu 22.04: From “Testing” to Production-ready with PM2 & Nginx

By admin July 20, 2026

Detailed guide on deploying Node.js to Ubuntu 22.04 for production. Use PM2 Cluster Mode for CPU optimization, Nginx as a Reverse Proxy, and free SSL with Certbot.