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Networking tutorial - IT technology blog

Configuring a Captive Portal with CoovaChilli and FreeRADIUS on Linux for Secure Guest Wi-Fi

October 17, 2026

Build a secure guest Wi-Fi gateway on Linux using CoovaChilli and FreeRADIUS. This guide walks through Layer 2/3 traffic isolation, WISPr bandwidth limiting, and captive portal splash page integration.

Database

Real-Time SQLite Backup to S3 with Litestream: Step-by-Step Guide for Zero-RPO Recovery

October 17, 2026

Learn how to continuously replicate SQLite databases to AWS S3 using Litestream. This step-by-step tutorial covers WAL streaming, sub-second RPO recovery, and production Docker setups.

Database

Data Masking with PostgreSQL Anonymizer: Sanitizing Sensitive Data for Staging Environments

October 17, 2026

Learn how to use PostgreSQL Anonymizer to mask sensitive PII before syncing production databases to staging, covering declarative security labels, deterministic masking, and CI/CD validation.

HomeLab

Set Up Cloudflare Tunnel with Docker: Expose HomeLab Services Securely Without Port Forwarding

October 17, 2026

Securely expose self-hosted HomeLab services to the web without port forwarding or dynamic DNS. Learn how to deploy Cloudflare Tunnel with Docker Compose and lock down access.

Linux

Mastering Strace on Linux: System Call Tracing to Debug Hanging Processes and Missing Files

October 17, 2026

Learn how to use strace to troubleshoot unresponsive Linux processes, track down missing configuration files, and pinpoint latency bottlenecks. This guide covers practical syscall tracing techniques, output filtering, and production debugging strategies.

Security

Automated Malware Analysis with CAPEv2 Sandbox on Linux: Build an Isolated Detonation Chamber to Extract IOCs

October 17, 2026

When fresh malware bypasses static antivirus filters during an active incident, automated dynamic analysis is your fastest triage route. Learn how to configure CAPEv2 on Ubuntu and KVM to dump memory and extract actionable C2 indicators in minutes.

Programming

Mastering Singleflight in Go: Stop Cache Stampedes and Protect Your Upstream Services

October 17, 2026

When hot cache keys expire during traffic spikes, databases can buckle under thousands of identical queries. Discover how Go's singleflight package deduplicates concurrent requests to protect your infrastructure with minimal overhead.

Database

Building Hybrid Search in PostgreSQL: Combining pgvector and Full-Text Search with Reciprocal Rank Fusion (RRF) for RAG

October 17, 2026

Combine pgvector semantic search with PostgreSQL full-text search using Reciprocal Rank Fusion (RRF). Build a resilient, high-accuracy hybrid retrieval engine for production RAG systems without external vector databases.

Security

Deploy Velociraptor on Linux: Real-Time Endpoint DFIR and Threat Hunting Guide

October 17, 2026

Deploy Velociraptor on Linux to build a fast, query-driven endpoint DFIR and threat hunting system. Learn how to install the server, deploy client agents, write custom VQL artifacts, and secure your forensic pipeline.

Linux

Master Rsync on Linux: SSH Sync, Bandwidth Tuning, and Incremental Backups

October 17, 2026

Learn how to use rsync for reliable SSH file syncing, bandwidth management, and automated incremental backups using hard links. Includes a ready-to-use production bash script and I/O tuning tips.

Mitigate DDoS with BGP Flowspec and ExaBGP on Linux: Automated Routing-Level Packet Filtering

Deploy Harbor on Docker: Self-Host a Secure Private Container Registry with Trivy and Image Signing for Your HomeLab

Building a Production-Ready Text-to-SQL Engine with Vanna.ai and Python

Deploy CrowdSec on Linux: Building a Distributed IPS to Block Brute Force and Web Attacks

Route-Based IPsec VPN with strongSwan and VTI on Linux: Secure Cloud-to-On-Premises Connectivity

Automate Kubernetes Troubleshooting with K8sGPT and Local Ollama

Mastering Outlines in Python: Guaranteed Structured LLM Output with Regex and CFGs

Mastering Cursor Rules and Context Mentions: Standardize Architecture Across Your Dev Team

Deploying HashiCorp Vault on Kubernetes: Dynamic Secrets and Sidecar Injector Guide

Deploying WPA3-Enterprise with FreeRADIUS and EAP-TLS: Mutual PKI Authentication Guide

Configuring a Captive Portal with CoovaChilli and FreeRADIUS on Linux for Secure Guest Wi-Fi

Real-Time SQLite Backup to S3 with Litestream: Step-by-Step Guide for Zero-RPO Recovery

Data Masking with PostgreSQL Anonymizer: Sanitizing Sensitive Data for Staging Environments

Set Up Cloudflare Tunnel with Docker: Expose HomeLab Services Securely Without Port Forwarding

Mastering Strace on Linux: System Call Tracing to Debug Hanging Processes and Missing Files

Automated Malware Analysis with CAPEv2 Sandbox on Linux: Build an Isolated Detonation Chamber to Extract IOCs

Mastering Singleflight in Go: Stop Cache Stampedes and Protect Your Upstream Services

Building Hybrid Search in PostgreSQL: Combining pgvector and Full-Text Search with Reciprocal Rank Fusion (RRF) for RAG

Deploy Velociraptor on Linux: Real-Time Endpoint DFIR and Threat Hunting Guide

Master Rsync on Linux: SSH Sync, Bandwidth Tuning, and Incremental Backups