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Virtualization tutorial - IT technology blog

Converting Virtual Machine Disk Formats with qemu-img: VMDK, QCOW2, VDI, and VHD

By admin March 25, 2026

This article provides a detailed guide on using the `qemu-img` tool to convert common virtual machine disk formats such as VMDK, QCOW2, VDI, and VHD. It covers preparation steps, basic command syntax, and practical use cases, helping newcomers easily migrate and manage VMs.

Centos

Install and Configure MariaDB on CentOS Stream 9: An Efficient MySQL Alternative

By admin March 25, 2026

This step-by-step guide is designed for IT beginners, helping you confidently deploy a powerful and stable MariaDB database system on CentOS Stream 9.

Linux

Understanding and Using Linux Capabilities: Fine-Grained Permissions Without Root for Applications

By admin March 25, 2026

Don't grant full root privileges to your application! This article provides a detailed guide on Linux Capabilities, a flexible permission mechanism that allows applications to perform privileged tasks without needing full root access. Includes a quick guide, in-depth explanations, and practical experiences for DevOps professionals.

Security

OWASP ZAP Guide: Web Application Vulnerability Scanning from Basics to CI/CD Automation

By admin March 25, 2026

This article shares practical experience with OWASP ZAP. It guides you through web application vulnerability scanning, from basic installation and configuration to automated CI/CD integration. The goal is to help you effectively protect your applications, detect security risks early, and maintain a secure system.

Database

PostgreSQL vs MySQL: A Detailed Comparison for IT Beginners

By admin March 25, 2026

Introduction: PostgreSQL and MySQL – Which One to Choose? When you start learning IT, especially…

Development

Makefile Tutorial: Optimize Your IT Project Workflow

By admin March 24, 2026

Introduction to the ProblemWhen working on software, do you find yourself repeatedly performing familiar tasks…

Linux

Effective Linux Debugging: A Detailed Guide with journalctl and dmesg

By admin March 24, 2026

Debugging on Linux is an essential skill. journalctl and dmesg are two powerful tools that help you identify the root cause of any issue, from services to hardware. This article guides you on how to use them effectively.

Network

Professional IP Management: Efficient DHCP Server Configuration With Dnsmasq On Linux

By admin March 24, 2026

Configuring a DHCP server with Dnsmasq on Linux is an important network administration skill. This article provides detailed instructions from installation to advanced configuration tips, helping you proactively manage IPs, optimize performance, and avoid network conflicts.

Artificial Intelligence tutorial - IT technology blog

NanoBot Installation Guide – The Ultralight OpenClaw Version with Only 4000 Lines of Code for Production Environments

By admin March 24, 2026

This article provides a detailed guide on installing and configuring NanoBot – an ultralight version of OpenClaw with only 4000 lines of code. It's an ideal solution for deploying efficient AI applications on resource-limited systems, based on practical experience from production environments.

Virtualization

Configuring Virtual Firewall and Routing with OPNsense/pfSense in KVM/Proxmox: Building a Secure Virtual Network System

By admin March 24, 2026

Don't let 2 AM network alerts wake you up anymore! Learn how to deploy OPNsense or pfSense as a virtual firewall and router in a KVM/Proxmox environment to enhance security, segment networks effectively, and gain detailed control over data flow for your virtual machines.

Monitor MySQL Performance with Performance Schema and sys Schema: Find Bottlenecks Fast

Building a News Website with Django: A Step-by-Step Guide for Beginners

Structuring the .claude/ Directory for Claude Code Projects: From Small to Large

OOM Killer: Why Linux Kills Your MySQL and How to Protect It

VMware Aria Operations Deployment Guide: A Lifesaver for vSphere Administrators

MySQL: Don’t Let utf8 Deceive You – The Ultimate Guide to Fixing Emojis and Font Issues with utf8mb4

Incus on Ubuntu: Installation Guide and Upgrading from LXD

Linux ACL: How to Set ‘Ultra-Detailed’ Permissions for Each User (Replacing chmod 777)

Mastering HashiCorp Packer: Automating Proxmox and VMware VM Template Creation

Stop Installing Terraform and Ansible Directly: Use Docker CLI to Keep Your Host Clean

Converting Virtual Machine Disk Formats with qemu-img: VMDK, QCOW2, VDI, and VHD

Install and Configure MariaDB on CentOS Stream 9: An Efficient MySQL Alternative

Understanding and Using Linux Capabilities: Fine-Grained Permissions Without Root for Applications

OWASP ZAP Guide: Web Application Vulnerability Scanning from Basics to CI/CD Automation

PostgreSQL vs MySQL: A Detailed Comparison for IT Beginners

Makefile Tutorial: Optimize Your IT Project Workflow

Effective Linux Debugging: A Detailed Guide with journalctl and dmesg

Professional IP Management: Efficient DHCP Server Configuration With Dnsmasq On Linux

NanoBot Installation Guide – The Ultralight OpenClaw Version with Only 4000 Lines of Code for Production Environments

Configuring Virtual Firewall and Routing with OPNsense/pfSense in KVM/Proxmox: Building a Secure Virtual Network System