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Deploying Ansible on CentOS Stream 9: Automate Linux Server Management Without Installing Agents

By IT From Zero July 10, 2026

A guide to deploying Ansible on CentOS Stream 9 to automate configuration and manage multiple Linux servers simultaneously. Ansible works over SSH — no agent installation, no extra ports — suitable for both beginners and operations teams.

Linux

Linux Filesystem Comparison: ext4, XFS, Btrfs, and F2FS — Choosing the Right One for Each Server Scenario

By IT From Zero July 10, 2026

A detailed comparison of four popular Linux filesystems — ext4, XFS, Btrfs, and F2FS — covering performance, key features, and real-world use cases. A practical guide to choosing the right filesystem for each server type: database, storage, general purpose, and flash storage devices.

MySQL

MySQL with Go (Golang): Connecting with database/sql, SQLX, and Optimizing Connection Pool for Microservices

By IT From Zero July 10, 2026

A practical guide to connecting MySQL with Go using database/sql and SQLX, complete with an optimized Connection Pool configuration for production microservices — solving too many connections errors and delivering meaningful query performance gains.

Database

Apache CouchDB: Installation, Multi-Directional Replication, and Real-World Offline-First Sync

By IT From Zero July 10, 2026

Install CouchDB on Ubuntu in 5 minutes, configure continuous replication between two servers, and handle post-sync conflicts with Python. Includes a guide to integrating PouchDB (~46KB) into your web app and when to choose CouchDB over PostgreSQL or MongoDB.

Linux

systemd-networkd: Minimal Linux Server Network Configuration — Replace NetworkManager with .network Files

By IT From Zero July 10, 2026

A guide to switching from NetworkManager to systemd-networkd on a headless Linux server — configure your network with simple .network files that are lighter and boot faster. Includes a 5-minute quick start, static IP and DHCP setup, multi-interface and VLAN configuration, and practical debugging tips from real VPS management experience.

MySQL

MySQL Connections in Python with PyMySQL and mysql-connector-python: Connection Pooling, Prepared Statements, and Safe Transactions to Prevent SQL Injection

By IT From Zero July 10, 2026

A practical guide to connecting MySQL in Python using PyMySQL and mysql-connector-python: setting up Connection Pooling to reuse connections, using Prepared Statements to prevent SQL Injection, and handling Transactions safely with a context manager — complete code examples from quick start to production.

Centos

Installing Elasticsearch and Kibana on CentOS Stream 9: Tips for Handling SELinux and Firewalld

By IT From Zero July 10, 2026

No more manual log hunting. A guide to installing Elasticsearch and Kibana on CentOS Stream 9, with a focus on proper SELinux and Firewalld configuration for production environments.

Database

PostGIS & PostgreSQL: The ‘Heavy Artillery’ for Geospatial Data Processing

By IT From Zero July 10, 2026

Master PostGIS installation and spatial query optimization. Discover why GiST Indexes are the key to processing millions of coordinates in just milliseconds.

MySQL

Connecting MySQL in Node.js with mysql2: Connection Pooling, Prepared Statements, and Transactions

By IT From Zero July 9, 2026

A guide to connecting MySQL in Node.js with the mysql2 library the right way, avoiding the common mistakes junior developers make. Learn how to use Connection Pooling for performance optimization, Prepared Statements to block SQL Injection, and Transactions to ensure data integrity when operating across multiple tables simultaneously.

Network

Configuring Transparent Proxy with TPROXY on Linux: Redirecting All TCP/UDP Without Per-Client Configuration

By IT From Zero July 9, 2026

TPROXY is a Linux kernel mechanism that intercepts and redirects all TCP/UDP traffic before clients can react — smart TVs, IP cameras, and IoT devices are intercepted without knowing it. From a 5-minute quick start to production-ready setup with nftables, SSL bump, and a practical debug checklist.

Configuring BFD with FRRouting on Linux: Sub-Second Link Failure Detection for OSPF and BGP

Clean Up Stale Remote-Tracking Branches with git remote prune and git fetch –prune

Implementing Single Sign-On (SSO) with Keycloak and Next.js: A Complete OpenID Connect (OIDC) Guide

Enable MySQL Slow Query Log and Use pt-query-digest to Find Database Bottlenecks

MetaGPT with Python Guide: Automate Software Development with Multi-Agent Systems

Configuring SR-IOV on KVM/Proxmox: Share 10GbE NICs with Near Bare-Metal Performance

Docker Autoheal Guide: Automatically Restart Unhealthy Containers

APScheduler in Python: Production-Ready Background Job Scheduling for Backend

How to Reclaim Storage Space (Space Reclamation / UNMAP) on VMware ESXi

How to Use Bitnami Sealed Secrets on Kubernetes: Secure GitOps Secrets Management

Deploying Ansible on CentOS Stream 9: Automate Linux Server Management Without Installing Agents

Linux Filesystem Comparison: ext4, XFS, Btrfs, and F2FS — Choosing the Right One for Each Server Scenario

MySQL with Go (Golang): Connecting with database/sql, SQLX, and Optimizing Connection Pool for Microservices

Apache CouchDB: Installation, Multi-Directional Replication, and Real-World Offline-First Sync

systemd-networkd: Minimal Linux Server Network Configuration — Replace NetworkManager with .network Files

MySQL Connections in Python with PyMySQL and mysql-connector-python: Connection Pooling, Prepared Statements, and Safe Transactions to Prevent SQL Injection

Installing Elasticsearch and Kibana on CentOS Stream 9: Tips for Handling SELinux and Firewalld

PostGIS & PostgreSQL: The ‘Heavy Artillery’ for Geospatial Data Processing

Connecting MySQL in Node.js with mysql2: Connection Pooling, Prepared Statements, and Transactions

Configuring Transparent Proxy with TPROXY on Linux: Redirecting All TCP/UDP Without Per-Client Configuration