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Mastering firewalld on Fedora: From Zone Management to Rich Rules Pro Tips

By admin March 30, 2026

Enhance your Fedora server security with this in-depth firewalld guide. Learn how to use Zones, Services, and Rich Rules to block IPs and limit connection rates effectively.

Network

How to Install and Configure OpenVPN Server on Linux: Easy Secure Remote Network Access

By admin March 29, 2026

This article provides a detailed guide on how to install and configure an OpenVPN Server on Linux to create a secure VPN connection. You'll learn about different VPN solutions, why OpenVPN is chosen, and how to deploy it step-by-step easily using an automated script.

Security

How to Install and Use OpenVAS (Greenbone) for Linux Server Vulnerability Scanning

By admin March 28, 2026

Protecting Linux servers from attacks requires regular vulnerability scanning. This article will guide you step-by-step through installing and using OpenVAS (Greenbone Vulnerability Management), a powerful tool, to proactively detect and remediate weaknesses in your system.

Security

Securing Microservices Communication with mTLS and SPIFFE/SPIRE: Real-World Tips

By admin March 28, 2026

Securing communication between microservices is a significant challenge. This article guides you through implementing Mutual TLS (mTLS) and using SPIFFE/SPIRE for service identity management. From quick setup to practical tips, I share personal experience to help you build secure microservices systems following a Zero Trust model.

Linux

Understanding and Using Linux Capabilities: Fine-Grained Permissions Without Root for Applications

By admin March 25, 2026

Don't grant full root privileges to your application! This article provides a detailed guide on Linux Capabilities, a flexible permission mechanism that allows applications to perform privileged tasks without needing full root access. Includes a quick guide, in-depth explanations, and practical experiences for DevOps professionals.

Security

Kubernetes Security: Essential Steps to Protect Your Cluster

By admin March 23, 2026

A Kubernetes cluster has numerous security vulnerabilities out of the box if it isn't properly hardened. This article breaks down the most common causes and walks through setting up RBAC, Pod Security, Network Policy, secret management, and runtime monitoring to effectively protect your production cluster.

Security

System File Integrity Monitoring with AIDE on Linux: Early Intrusion Detection and Data Tampering Prevention

By admin March 22, 2026

Ensuring Linux server security is a top priority, and File Integrity Monitoring (FIM) with AIDE is an effective solution. This article shares practical experience deploying AIDE for early intrusion detection and prevention of system data tampering.

Artificial Intelligence tutorial - IT technology blog

Securing AI Service API Keys (OpenAI, Claude, Gemini): A 2 AM Production Lesson

By admin March 20, 2026

AI service API keys are critical assets requiring strict protection. This guide provides detailed instructions on securing API keys for OpenAI, Claude, and Gemini based on real-world experience, preventing leaks that cause financial damage and service disruption. It covers solutions from environment variables to cloud secret management and service-to-service authentication.

Security

Installing and Configuring ModSecurity (WAF) on Nginx: Protecting Web Applications from A-Z

By admin March 19, 2026

ModSecurity (WAF) on Nginx is a powerful tool to protect web applications from common attacks. This article provides a detailed guide from basic installation to advanced fine-tuning, based on practical experience deploying in production environments, helping you set up a secure "shield" for your website.

Securing AI API Integrations in Production: Real-world experience and helpful tips

By admin March 17, 2026

Learn crucial security strategies for AI API integration in production. Practical advice on API key management, prompt injection prevention, and secure application monitoring to protect your systems.