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Virtualization tutorial - IT technology blog

Deploying oVirt: An Enterprise KVM Management Solution to Replace VMware vSphere

By admin April 19, 2026

A detailed guide on deploying oVirt 4.5 as a VMware vSphere alternative for enterprises. Real-world insights on installing Hosted Engine and configuring Storage and Network on KVM.

Python

Cleaning Up Python Security: Hands-on Bandit and Safety in DevSecOps

By admin April 19, 2026

Don't let your Python projects become targets for hackers. Hands-on guide to using Bandit and Safety for automated security vulnerability scanning in DevSecOps.

Artificial Intelligence tutorial - IT technology blog

Ultra-fast LLM Fine-tuning with Unsloth: 90% VRAM Reduction, Run Llama 3 on Budget GPUs

By admin April 19, 2026

Fine-tune Llama 3 8B with just 6.5GB VRAM? A detailed guide on using Unsloth to triple LLM training speed and maximize hardware cost savings for developers.

Security

Self-hosting Vaultwarden with Docker: Lightweight and Secure ‘Personal’ Password Management

By admin April 19, 2026

Don't let passwords be your biggest weakness. This article guides you through deploying Vaultwarden with Docker to take full control of your data at near-zero cost.

Python

Python & Netmiko: Rescuing Network Engineers from 3 Hours of Manual Switch Configuration

By admin April 19, 2026

Manual network administration becomes a burden as systems scale. Learn how to use Python and Netmiko to automate bulk Cisco and Juniper device configuration safely.

Development

LocalStack: Simulate AWS S3, Lambda, DynamoDB Locally — Completely Free

By admin April 18, 2026

LocalStack lets you emulate AWS S3, Lambda, and DynamoDB locally using Docker, no real AWS account needed. This guide covers setup, a comparison with alternative approaches, and pytest integration for running integration tests completely offline.

Git

Git Filter-Repo: Permanently Remove Sensitive Data and Large Files from Repository History

By admin April 18, 2026

git-filter-repo is the officially recommended Git tool for permanently removing sensitive files, API keys, passwords, and large files from your entire repository history. This guide covers everything from installation and file removal to secret replacement, force pushing, and preventing future incidents.

Network

Mastering the socat Command on Linux: Port Forwarding, Relays, and SSL Tunnels in Practice

By admin April 18, 2026

socat is a powerful Linux command-line tool for port forwarding, TCP/UDP relays, and SSL tunnels — all with a single command. This guide walks through real-world scenarios from basic port forwarding and multi-hop relays to wrapping plain TCP services with SSL.

Database

TimescaleDB: A Lifesaver for PostgreSQL When IoT Data Explodes

By admin April 18, 2026

Don't let PostgreSQL get bogged down by billions of IoT records. Discover how TimescaleDB optimizes performance with hypertables, 90% data compression, and 40x faster dashboards.

Network

Port Knocking: How to Hide SSH Ports and Make Your Linux Server Invisible to Botnets

By admin April 18, 2026

Port Knocking is a security technique that completely hides SSH ports from port scanners. Learn how to install knockd on Linux to protect your server from brute-force attacks.

Automating Proxmox with Terraform: From Manual ‘Click-ops’ to Professional IaC

Building a Data Streaming System with Apache Kafka and Node.js: From Zero to Production

Mastering Logical Replication in PostgreSQL: Flexible and Practical Data Sync

Mastering Fedora Security: Managing System-Wide Encryption with update-crypto-policies

Automating Dependencies with Renovate: Don’t Let Manual Updates Slow You Down

Harbor Installation Guide: Building a Professional Private Registry for DevOps

How to Never Forget SSL and Domain Renewals Again with Prometheus Blackbox Exporter

Boost Productivity with Git Aliases: Don’t Let Typing Commands Slow You Down

How to Safely Expose Docker Containers to the Internet via Cloudflare Tunnel (No Port Forwarding)

Self-hosting Grafana OnCall: Professional On-call Scheduling and Escalation for DevOps Teams

Deploying oVirt: An Enterprise KVM Management Solution to Replace VMware vSphere

Cleaning Up Python Security: Hands-on Bandit and Safety in DevSecOps

Ultra-fast LLM Fine-tuning with Unsloth: 90% VRAM Reduction, Run Llama 3 on Budget GPUs

Self-hosting Vaultwarden with Docker: Lightweight and Secure ‘Personal’ Password Management

Python & Netmiko: Rescuing Network Engineers from 3 Hours of Manual Switch Configuration

LocalStack: Simulate AWS S3, Lambda, DynamoDB Locally — Completely Free

Git Filter-Repo: Permanently Remove Sensitive Data and Large Files from Repository History

Mastering the socat Command on Linux: Port Forwarding, Relays, and SSL Tunnels in Practice

TimescaleDB: A Lifesaver for PostgreSQL When IoT Data Explodes

Port Knocking: How to Hide SSH Ports and Make Your Linux Server Invisible to Botnets