server hardening Archives

Mastering nftables on Linux: Building a Modern Stateful Firewall to Replace iptables

October 6, 2026

A production-tested guide to replacing iptables with nftables on Linux. Learn how to configure unified IPv4/IPv6 filtering, rate limiting, and atomic zero-downtime rule updates.

Security

Hardening /dev/shm: Stop Malware from Hiding in Your Server’s RAM

August 2, 2026

Is your /dev/shm directory a security hole? Learn how to use mount flags like noexec and nosuid to prevent attackers from running malware directly from your server's RAM.

Security

Detecting and Removing Cryptominer Malware on Linux Servers

June 30, 2026

A Linux server running at 98% CPU with no traffic spike is a red flag for cryptominer malware. This guide walks through systematic detection of CPU-hijacking miners, safe removal of all persistence mechanisms, and practical hardening steps to prevent reinfection.

Linux

Custom Linux Kernels: Stripping the Bloat for Speed and Security

June 6, 2026

Compiling a custom Linux kernel allows you to strip away unnecessary drivers and optimize for specific CPU architectures, leading to a faster, more secure server.

Networking

GeoIP Blocking with nftables and MaxMind GeoLite2 on Linux: Filter Traffic by Country

May 29, 2026

GeoIP blocking with nftables and MaxMind GeoLite2 lets you drop traffic from entire country IP ranges at the firewall level, before it reaches your application. This guide covers the full setup: downloading the database, extracting country ranges, loading them into nftables sets, and automating bi-weekly updates with systemd and cron.

Security

Hardening Linux: Using OpenSCAP to Automate CIS Benchmark Compliance

May 4, 2026

Stop guessing your server's security status. Learn to use OpenSCAP to audit Linux systems against CIS Benchmarks, replacing manual checklists with automated, repeatable security.

Security

Linux Server Security Auditing: Automating Hardening with Lynis

April 15, 2026

Discover how to use Lynis to automate Linux security audits. This guide covers installation, interpreting the Hardening Index, and practical steps to secure your kernel and file system permissions.

Security

Hunting Malware on Linux: A Hands-on Guide to YARA Rules

April 13, 2026

Master YARA rules to secure your Linux environment. This guide walks you through installation, writing effective detection rules, and automating memory scans to catch hidden threats.

Security

Hardening Linux: A Practical Guide to ClamAV and Rkhunter

April 7, 2026

Secure your Linux server against malware and hidden backdoors. This guide walks you through setting up ClamAV and Rkhunter, automating scans, and managing system integrity.

Security

SSL/TLS Certificate Setup with Let’s Encrypt: A Production Guide

March 13, 2026

Web security is critical. This guide offers clear, practical steps to implement SSL/TLS certificates with Let's Encrypt, ensuring your web applications are secure and trusted. Learn about installation, configuration, and automatic renewal.