Article
How to Harden Ubuntu with AppArmor and UFW Rules
AppArmor and UFW solve different parts of the same problem: limiting what services can do and who can reach them. This article explains how they complement each other, …
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Article
Article
Hardening Ubuntu SSH Access with Key-Based Authentication
Key-based authentication is one of the most effective ways to harden SSH access on Ubuntu Server. This article explains when it fits, how it works operationally, what to …
Article
Secure Ubuntu Server Hardening: Disable Unused Services and Ports
Unused daemons and open ports are one of the easiest ways to expand attack surface on Ubuntu Server. This article explains how to identify what is listening, decide …
How-To Guide
How to Secure SSH on Ubuntu with Key-Based Authentication
Use key-based authentication to harden SSH on Ubuntu with a practical workflow: generate keys, install them safely, verify access, and disable password logins only after validation.
Checklist
Ubuntu Security Hardening Checklist for Production Servers
A practical, verifiable Ubuntu security hardening checklist for production servers. Use it to validate access controls, patching, network exposure, logging, and recovery readiness before go-live.
Script
Bash Script to Automate Ubuntu Security Patch Audits
This guide shows how to build a Bash script that audits Ubuntu security patches by checking installed packages against available security updates, with safe defaults, validation, and exportable …
Tutorial
How to Configure UFW Firewall Rules on Ubuntu Server
Configure UFW firewall rules on Ubuntu Server with a safe, repeatable workflow: verify prerequisites, allow required services, validate access, and review common mistakes before production use.