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Monitoring tutorial - IT technology blog

Monitor Directory Sizes with Prometheus Folder Exporter: Don’t Wait for a Full Disk to Panic

By admin June 25, 2026

Stop SSHing into servers at 2 AM to find bloated log files. Use Prometheus Folder Exporter to monitor directory sizes and get early alerts.

Network

Scapy: The ‘Heavy Weapon’ for Network Troubleshooting on Linux

By admin June 25, 2026

Don't let basic networking tools limit your debugging capabilities. Learn how to use Scapy to craft custom packets, bypass firewalls, and diagnose the most subtle network issues.

Artificial Intelligence tutorial - IT technology blog

A Guide to Automated LLM Unit Testing with DeepEval

By admin June 25, 2026

DeepEval lets you write unit tests for LLM applications just like regular pytest, with metrics for AnswerRelevancy, Faithfulness, and hallucination detection. A guide from a 5-minute install to CI/CD integration for automatically controlling AI quality before every deployment.

VMware

VMware vSphere Tags and Custom Attributes Guide: Efficiently Classify and Manage Hundreds of Virtual Machines

By admin June 25, 2026

VMware vSphere Tags and Custom Attributes let you classify and search hundreds of VMs across multiple dimensions simultaneously — something VM names and folders alone simply can't do. This guide covers practical setup and usage with PowerCLI, drawn from hands-on experience managing an 8-host ESXi cluster.

Git

How to Set Up a Self-Hosted Git Bare Repository on Linux via SSH: Share Code in Small Teams Without Gitea or GitHub

By admin June 25, 2026

Self-host a Git server in 10 minutes using a bare repository over SSH — no Gitea, no GitHub, no extra software required. Perfect for small teams of 2–5 people who want secure, simple, low-maintenance internal code sharing.

Security

Using usbrip to Investigate USB Connection History on Linux: Detecting Physical Port Intrusions

By admin June 25, 2026

usbrip is a dedicated Python tool for investigating USB connection history on Linux, invaluable for forensics and incident response. This article compares three approaches to USB tracking, weighs the pros and cons, then walks through installing usbrip, building a whitelist, and automating unauthorized device detection with crontab.

Development

Redis Distributed Lock in Microservices: Preventing Race Conditions in Concurrent Processing

By admin June 25, 2026

A guide to implementing Redis Distributed Lock in a Microservices architecture to solve Race Conditions when multiple services process the same data concurrently. Includes real Python code with safe Lua scripts, guidance on choosing the right TTL, and monitoring locks in Redis.

Linux

How to Configure kdump on Linux: Collecting Kernel Crash Dumps and Analyzing Critical System Failures

By admin June 25, 2026

kdump captures the entire state of RAM at the moment of a kernel panic — before the system has a chance to reboot. It is the only tool that allows sysadmins to investigate the root cause of a server crash when the logs record nothing. This guide covers installing and configuring kdump on RHEL/CentOS/Ubuntu, safely triggering a test crash, and analyzing vmcore files with the crash tool.

Fedora

Handling Crashes on Fedora: Automating Debug and Bug Reporting with ABRT

By admin June 25, 2026

Fedora apps crashing with no explanation? Learn how to use ABRT to automatically catch errors, analyze coredumps, and report bugs like a seasoned engineer.

Network

Linux Bandwidth Monitoring: Identify Network-Hogging Processes with Nethogs and Iftop

By admin June 25, 2026

Master Nethogs and Iftop to analyze bandwidth by PID and IP. This article shares real-world scenarios for troubleshooting midnight server network congestion.