Security - ITNotes

How to Set Up a Firewall with UFW / iptables for Linux Server Security

March 12, 2026

My server recently survived an intense SSH brute-force attack, reinforcing the urgent need for strong security. This tutorial walks you through setting up UFW, the Uncomplicated Firewall, to defend your Linux server from unauthorized access. Learn to configure crucial rules and maintain a secure system.

Security

Linux Server Hardening Checklist: Prevent 2 AM Security Incidents

March 12, 2026

A server compromise at 2 AM is a nightmare no IT professional wants. This guide provides a practical Linux server hardening checklist, helping you understand common vulnerabilities and implement proactive security measures. Learn to secure your systems with strong passwords, robust firewalls, regular updates, and more to prevent incidents.

Security

Container Security Essentials: Docker & Kubernetes Best Practices

March 12, 2026

Securing containerized applications is crucial in modern IT. This article dives into essential Docker and Kubernetes security practices, covering everything from image hardening and runtime protection to robust operational monitoring. Learn how to build a resilient defense against common vulnerabilities and maintain the integrity of your deployments.

Security

Prompt Injection Attacks: Understanding and Defending Your AI Applications

March 11, 2026

Prompt injection attacks pose a significant threat to AI applications, manipulating Large Language Models (LLMs) to perform unintended actions. This guide explains how these attacks work and provides practical strategies to protect your systems from malicious prompts.

Security

SSH Security Best Practices: Key Auth, Fail2Ban, and Port Knocking Explained

March 11, 2026

Discover how to significantly enhance your server's SSH security. This tutorial covers implementing key authentication to replace passwords, using Fail2Ban to combat brute-force attacks, and setting up port knocking for an invisible SSH port, protecting your server from unauthorized access.

Security

OWASP Top 10: Understanding and Preventing Common Web Vulnerabilities

March 10, 2026

Dive into the OWASP Top 10, your crucial guide to understanding and preventing common web vulnerabilities. This article offers a beginner-friendly breakdown of critical security risks like Injection and Broken Access Control, complete with practical examples to help junior developers build secure applications.

Security

How I Detect and Prevent Brute-Force Attacks (A 6-Month Review)

March 10, 2026

A midnight brute-force attack forced me to get serious about server security. For the last six months, a layered strategy using Fail2ban and SSH keys has kept my systems secure and silent. This guide details my practical, battle-tested setup so you can do the same.

Security

Self-Hosted Password Management: A Guide to Vaultwarden

March 10, 2026

Tired of trusting your passwords to cloud services? This guide shows you how to take back control by setting up a secure, self-hosted password manager with Vaultwarden and Docker. Follow these practical steps for installation, configuration, and essential maintenance.