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Mastering MySQL & PostgreSQL with Prometheus Exporter: Ending the ‘Guessing Game’ of Slow Queries

By IT From Zero April 12, 2026

Don't let your database become a 'black box'. A detailed guide on using Prometheus Exporter to identify slow queries, handle replication lag, and optimize DB performance based on real-world experience.

Linux

Hunting Down and Eliminating Zombie Processes: When Linux Servers Are Besieged by the Undead

By IT From Zero April 12, 2026

Zombie processes don't consume RAM but can exhaust PIDs, paralyzing your Linux server. Discover how to track down PPIDs and eliminate these 'undead' processes based on real-world experience.

Security

CSP for Nginx & Apache: A Powerful ‘Shield’ Against XSS for Your Website

By IT From Zero April 12, 2026

Configuring Content Security Policy (CSP) is a vital step in protecting your website from XSS. Check out this detailed guide for Nginx and Apache to help your site achieve an A+ security rating.

Docker

Dockerize Your Project in a Heartbeat with `docker init`: Fast, Standard, and Effortless

By IT From Zero April 12, 2026

Forget writing Dockerfiles from scratch! The docker init command helps you generate best-practice Docker and Compose configs in just 30 seconds, optimizing for size and security.

Database

DBeaver: The Ultimate ‘Weapon’ for Managing MySQL, PostgreSQL, and MongoDB

By IT From Zero April 12, 2026

DBeaver is an all-in-one database management tool that handles everything from MySQL and PostgreSQL to MongoDB in one interface. Learn how to save RAM and boost productivity.

Network

Linux Security: Implementing DoH and DoT to ‘Stay Hidden’ from ISPs

By IT From Zero April 12, 2026

Don't let ISPs know what you're accessing. A detailed guide on encrypting DNS with DoT and DoH on Linux for total privacy protection.

Python

Regex for Beginners: Deciphering the “Code” and Processing Data in 5 Minutes

By IT From Zero April 12, 2026

Master Regex in Python for lightning-fast data processing. A detailed guide from basic syntax to data extraction techniques using real-world examples.

Security

Building an Internal Certificate Authority with step-ca: Say Goodbye to LAN Security Warnings

By IT From Zero April 11, 2026

Say goodbye to red security warnings in your LAN. A detailed guide on building an internal Certificate Authority (CA) with step-ca and automating SSL via ACME.

MySQL

MySQL 8 Window Functions: The Ultimate Lifesaver for Complex Reporting Queries

By IT From Zero April 11, 2026

MySQL 8 Window Functions are powerful tools for efficient running totals, rankings, and data comparisons, replacing complex and heavy SELF JOIN queries.

Database

Apache Cassandra: Master the “Write-Heavy Storm” for Large-Scale Systems

By IT From Zero April 11, 2026

Master Apache Cassandra for massive write-heavy systems. This article shares query-driven data modeling strategies and performance optimization tips from real-world experience.

Optimizing Redis RAM with HyperLogLog and Bloom Filter: Counting and Deduplicating at Scale

Building an Event-Driven Microservices System with Apache Kafka and NestJS: From Producer and Consumer to Dead Letter Queue (DLQ)

Installing and Configuring Rootless Docker: Run Docker Without Root to Protect Your Host

Configuring a PPPoE Server on Linux Using rp-pppoe for ISP Labs

A Guide to DiskCache in Python: Safe Multi-Process Disk Caching Without Redis

How to Configure Host sFlow on Linux: Real-Time Network Traffic and KVM Monitoring

Diagnosing and Resolving Deadlocks in PostgreSQL: Inspecting Lock Trees and Configuring Proper Timeouts

ESXi Host Configuration Backup and Restore with PowerCLI and ESXCLI: Saving Your Virtualization Cluster During Outages

Guide to VFIO PCIe Passthrough on Linux KVM: GPU Passthrough for Windows VMs

Integrating OpenTelemetry into Python: Practical Microservices Monitoring Strategies

Mastering MySQL & PostgreSQL with Prometheus Exporter: Ending the ‘Guessing Game’ of Slow Queries

Hunting Down and Eliminating Zombie Processes: When Linux Servers Are Besieged by the Undead

CSP for Nginx & Apache: A Powerful ‘Shield’ Against XSS for Your Website

Dockerize Your Project in a Heartbeat with `docker init`: Fast, Standard, and Effortless

DBeaver: The Ultimate ‘Weapon’ for Managing MySQL, PostgreSQL, and MongoDB

Linux Security: Implementing DoH and DoT to ‘Stay Hidden’ from ISPs

Regex for Beginners: Deciphering the “Code” and Processing Data in 5 Minutes

Building an Internal Certificate Authority with step-ca: Say Goodbye to LAN Security Warnings

MySQL 8 Window Functions: The Ultimate Lifesaver for Complex Reporting Queries

Apache Cassandra: Master the “Write-Heavy Storm” for Large-Scale Systems