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Docker Volumes: Persistent Data Storage That Survives Container Restarts

By IT From Zero March 8, 2026

Lost an entire database at 2 AM because I forgot to use Docker volumes — here's the hard-won lesson and a guide to configuring volumes correctly for production, including backup and monitoring.

Artificial Intelligence tutorial - IT technology blog

Whisper OpenAI: A Practical Guide to Speech-to-Text with Python

By IT From Zero March 8, 2026

After six months running Whisper in production, I compare three approaches — Whisper local, Whisper API, and faster-whisper — breaking down the pros and cons, walking through practical Python code, and covering how to handle common issues.

Database

Optimizing PostgreSQL Queries with EXPLAIN ANALYZE: Analyzing and Improving Query Performance

By IT From Zero March 8, 2026

Learn how to use EXPLAIN ANALYZE in PostgreSQL to read execution plans, analyze slow queries, and optimize performance with the right indexes. This guide goes from a 5-minute quick start to advanced techniques like covering indexes, composite indexes, and auto_explain.

What is MCP? Understanding Model Context Protocol and How to Integrate It into Your AI Project

By IT From Zero March 8, 2026

MCP (Model Context Protocol) is Anthropic's open standard that lets AI models connect directly to your file system, databases, and external tools. This article explains the 3-component architecture, walks through setup with Claude Desktop and the Python SDK, and covers practical security configuration and debugging.

Network

How to Set Up a Load Balancer with HAProxy on Linux

By IT From Zero March 8, 2026

A practical guide to configuring HAProxy as a load balancer: from installation and roundrobin/leastconn/source algorithms to HTTP health checks, SSL termination, and zero-downtime server draining. Tips drawn from real production experience.

Optimizing LLM API Costs: Prompt Caching, Batching, and Eliminating Unnecessary Tokens

By IT From Zero March 7, 2026

Skyrocketing LLM API bills usually come down to 3 causes: repeated system prompts, piecemeal requests, and wasted tokens in prompts. This article covers 3 practical techniques — prompt caching, batch processing, and prompt compression — to cut costs by 50–80%, with concrete Python code examples.

Database

Setting Up and Configuring Redis Sentinel: High Availability for Redis in Production

By IT From Zero March 7, 2026

A practical guide to setting up a 3-node Redis Sentinel cluster for high availability in production: configuring master-replica replication, automatic failover, connecting applications through Sentinel, and common operational pitfalls.

Linux

Linux Disk Mount and Management Guide: From lsblk to fstab

By IT From Zero March 7, 2026

A detailed guide to mounting and managing disks on Linux: identifying block devices with lsblk, creating partitions with parted/fdisk, formatting filesystems with ext4/xfs, and configuring fstab with UUIDs for persistent mounts. Real-world experience from a CentOS 7 production server.

Centos

Migrating from CentOS 8 to AlmaLinux 9: Comparing 3 Methods with Step-by-Step Instructions

By IT From Zero March 7, 2026

A step-by-step guide to migrating your server from CentOS 8 to AlmaLinux 9 using a safe 2-step process: convert to AlmaLinux 8 with the official script, then upgrade to AlmaLinux 9 with ELevate. Compares all 3 migration methods, analyzes trade-offs, and provides a complete post-migration checklist.

Virtualization

Creating and Managing Virtual Machines with Proxmox VE: From Installation to Real-World Monitoring

By IT From Zero March 7, 2026

A guide to creating and managing virtual machines with Proxmox VE via web UI and CLI — from installation, VM creation, snapshots, and template cloning to monitoring and backups. Includes practical qm commands and a Telegram alert script for VM downtime.

Building Your Own MCP Server with TypeScript: Connect AI Assistants to Internal Systems

Mastering TanStack Query v5 in React: Practical Server State Management, Caching, and Optimistic Updates

Installing ModSecurity v3 and OWASP CRS on Nginx Ubuntu: Building a Production-Ready Web Server WAF

Centralized Cloudflare Traffic and Security Monitoring with Cloudflare Exporter, Prometheus, and Grafana

Guide to E2B Code Interpreter with Python: Building a Secure Sandbox for AI Agents

A Guide to bpftrace and BCC on Fedora: Linux Performance Analysis and Diagnostics with eBPF

Optimizing Index Merge in MySQL: Understanding Intersection, Union, and Handling Optimizer Missteps

How to Create Systemd Services and Systemd Timers on Ubuntu: A Robust Crontab Alternative

Configuring the FEDERATED Storage Engine in MySQL: Connect and Query Remote Tables

SGLang on Linux Guide: Accelerate LLM Inference and Optimize RadixAttention for AI APIs

Docker Volumes: Persistent Data Storage That Survives Container Restarts

Whisper OpenAI: A Practical Guide to Speech-to-Text with Python

Optimizing PostgreSQL Queries with EXPLAIN ANALYZE: Analyzing and Improving Query Performance

What is MCP? Understanding Model Context Protocol and How to Integrate It into Your AI Project

How to Set Up a Load Balancer with HAProxy on Linux

Optimizing LLM API Costs: Prompt Caching, Batching, and Eliminating Unnecessary Tokens

Setting Up and Configuring Redis Sentinel: High Availability for Redis in Production

Linux Disk Mount and Management Guide: From lsblk to fstab

Migrating from CentOS 8 to AlmaLinux 9: Comparing 3 Methods with Step-by-Step Instructions

Creating and Managing Virtual Machines with Proxmox VE: From Installation to Real-World Monitoring