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

By admin April 24, 2026

A hands-on guide to using Performance Schema and sys Schema in MySQL to detect slow queries, lock waits, and I/O bottlenecks — a step-by-step workflow for developers just starting to optimize their database.

Python

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

By admin April 24, 2026

A step-by-step guide to building a complete news website with Django: setting up article models, admin panel, image uploads, pagination, and clean URL slugs. Perfect for junior developers who want a real-world project from day one.

Artificial Intelligence tutorial - IT technology blog

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

By admin April 24, 2026

The .claude/ directory is Claude Code's "long-term memory" — where project context, coding rules, and custom commands live. This guide covers how to organize .claude/ from a solo project to a large team, with practical examples and common mistakes to avoid.

Linux

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

By admin April 24, 2026

When a Linux application shuts down unexpectedly, the OOM Killer is often to blame. Learn how to read dmesg logs, understand the oom_score metric, and protect MySQL and Redis from being terminated by the OS.

VMware

VMware Aria Operations Deployment Guide: A Lifesaver for vSphere Administrators

By admin April 24, 2026

Managing vSphere is no longer a headache with VMware Aria Operations. A detailed guide on installation, configuration, and resource optimization tips from real-world experience.

MySQL

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

By admin April 24, 2026

Don't let MySQL's 'utf8' mislead you. A detailed guide on configuring utf8mb4 to support Emojis and Vietnamese, plus how to handle the 767-byte index error based on real-world experience.

Virtualization

Incus on Ubuntu: Installation Guide and Upgrading from LXD

By admin April 24, 2026

Incus is a fully open-source fork of LXD that removes Snap and optimizes performance. Read our guide to installing and configuring Incus on Ubuntu for efficient container/VM management.

Linux

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

By admin April 24, 2026

Forget chmod 777! Learn how to use Linux ACLs for 'surgical' user and group permissions, solving permission issues in real-world projects.

Virtualization

Mastering HashiCorp Packer: Automating Proxmox and VMware VM Template Creation

By admin April 24, 2026

Learn how to use HashiCorp Packer to automate the Virtual Machine (VM) template creation process on Proxmox and VMware. Save 90% of setup time for DevOps and SysAdmins.

Docker

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

By admin April 24, 2026

Stop installing Terraform or Ansible directly! Discover how to use Docker for all your CLI tools to keep your host system clean and eliminate version conflicts once and for all.