How to Monitor Linux RAID Arrays: Complete mdadm Health Check Guide
RAID (Redundant Array of Independent Disks) provides data redundancy and performance improvements for Linux servers. How...
Security & Hardening
Linux security, firewall configuration, and system hardening guides
AppArmor Profile Security Check: Ubuntu/Debian Guide
Check AppArmor profiles, enforcement modes, and violations with dargslan-apparmor-check CLI tool....
Sudoers Security Audit: Finding NOPASSWD Entries and Privilege Escalation Risks
The sudoers file is the single most important text file on a Linux server. A misconfigured rule is the most common path ...
Linux Login Tracking: SSH Session Monitoring and Brute Force Detection
Monitoring login activity is a fundamental security practice. Every SSH session, failed authentication attempt, and susp...
Linux User Session Management: Active Sessions, Idle Detection, and TTY Monitoring
Managing user sessions is a critical security and operational task. Knowing who is logged in, what they are doing, and h...
Linux Sysctl Audit: Kernel Parameter Security Hardening and Network Tuning
A periodic sysctl audit catches the slow drift that turns a hardened server into an unhardened one. Over months, distrib...
PAM Authentication Audit: Securing the Linux Login Stack
PAM controls how users authenticate on Linux. A misconfigured PAM stack can lock out legitimate users or leave the door ...
SSH Hardening: Securing Your Linux Server Against Brute Force and Unauthorized Access
SSH is the front door to every Linux server you operate. Get it right and the box can sit on the public internet for yea...
Environment Variable Security: Preventing Credential Leaks and PATH Hijacking
Environment variables are the silent attack surface of every Linux server. Every running process exposes its environment...