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Networking tutorial - IT technology blog

Deploying Network Access Control (NAC) with PacketFence: Automate Device Authentication on Wired and Wi-Fi Networks

April 28, 2026

PacketFence is an open-source NAC platform that controls which devices can connect to your wired and Wi-Fi network using 802.1X, RADIUS, and dynamic VLAN assignment. This guide covers installation, switch configuration, Active Directory integration, and deployment tips drawn from a real ransomware incident response.

How to Convert LLM Models to GGUF Format with llama.cpp Quantization

April 28, 2026

Running large language models locally requires shrinking their file size without destroying quality. This guide walks through the full llama.cpp pipeline: downloading a Hugging Face model, converting it to GGUF format, and quantizing it to Q4_K_M or other levels to fit consumer hardware.

HomeLab

Install Changedetection.io on Docker: Monitor Website Changes and Get Instant Telegram Alerts in Your HomeLab

April 28, 2026

Changedetection.io is a self-hosted tool that monitors website content changes and sends instant alerts. This guide walks through setting it up with Docker Compose and configuring Telegram notifications for your HomeLab — including JavaScript-rendered pages via Playwright.

Database

Taming PostgreSQL Table Bloat: A Practical Guide to VACUUM and ANALYZE

April 28, 2026

PostgreSQL doesn't delete data in place, leading to 'Table Bloat.' Learn how to use VACUUM, tune Autovacuum settings, and identify long-running transactions to keep your production database healthy.

Security

Hunting Leaked Secrets: Using TruffleHog to Secure Your Git History

April 28, 2026

Accidentally committed an API key? Learn how to use TruffleHog to scan your Git history, verify if secrets are still active, and remove them permanently.

Security

Automating SSL/TLS Certificate Lifecycle Management with cert-manager on Kubernetes

April 27, 2026

Manual SSL certificate management fails at scale — expiry dates get missed, secrets fall out of sync, and incidents happen over weekends. This guide walks through setting up cert-manager on Kubernetes to automate certificate issuance and renewal from both Let's Encrypt and a private internal CA, so you never chase an expiry date again.

Linux

How I Cut My Linux Server Boot Time in Half Using systemd-analyze

April 27, 2026

After six months of running a slow-booting Ubuntu 22.04 production server, I used systemd-analyze to trace a 40-second boot time down to three root causes and fixed them. Here is the full process, from reading the blame output to choosing between disabling, masking, or delaying services.

Linux

Fixing ‘Too many open files’ on Linux: A Guide to File Descriptors and ulimit

April 27, 2026

Tired of 'Too many open files' errors? This guide explains how to properly configure Linux File Descriptors using ulimit, limits.conf, and systemd overrides for high-performance servers.

High-Performance LLM Inference: Scaling vLLM and Docker for Production

April 27, 2026

Boost your AI performance with vLLM and Docker. Learn to use PagedAttention, Tensor Parallelism, and quantization to scale LLMs for hundreds of concurrent users.

Building a Production-Ready REST API with Spring Boot, Spring Security, JPA, and Docker

Building a Laravel REST API with Docker: From Zero to Production in 2024

Mastering Prometheus Alertmanager: Routing, Grouping, Inhibition, and Smart Alert Delivery to Telegram and PagerDuty

Securing IoT Devices at Home and in Your HomeLab: VLAN Segmentation, Firmware Monitoring, and Blocking Suspicious Connections

Mastering Protocol Buffers: Schema-first API Design for Multi-language Projects

Deploy FerretDB on Docker: MongoDB-Compatible Open Source Database Built on PostgreSQL

Practical Web Security: Hunting XSS, SQLi, and IDOR with Burp Suite Community

Deploy OpenCTI on Docker: Build Your Own Threat Intelligence Lab

Beyond Boolean Soup: Architecting Robust React Logic with XState

Why Is My Linux Load Average High Despite Low CPU Usage?

Deploying Network Access Control (NAC) with PacketFence: Automate Device Authentication on Wired and Wi-Fi Networks

How to Convert LLM Models to GGUF Format with llama.cpp Quantization

Install Changedetection.io on Docker: Monitor Website Changes and Get Instant Telegram Alerts in Your HomeLab

Taming PostgreSQL Table Bloat: A Practical Guide to VACUUM and ANALYZE

Hunting Leaked Secrets: Using TruffleHog to Secure Your Git History

Automating SSL/TLS Certificate Lifecycle Management with cert-manager on Kubernetes

How I Cut My Linux Server Boot Time in Half Using systemd-analyze

Fixing ‘Too many open files’ on Linux: A Guide to File Descriptors and ulimit

High-Performance LLM Inference: Scaling vLLM and Docker for Production