Free Sample Chapters

Learn essential Linux security fundamentals. Secure users, permissions, authentication, services, firewalls, SELinux, logging, intrusion detection, updates, backups, and containers with practical examples.

Master iptables from the ground up. Learn to design, deploy, and maintain robust Linux firewalls — from packet flow fundamentals to advanced NAT, rate limiting, and real-world hardening scenarios.

Master Linux firewalls with iptables, firewalld, nftables, and UFW. Learn practical firewall rules for servers, workstations, cloud, Docker, Kubernetes, and real-world security scenarios.

Learn Linux security fundamentals. Protect systems, users, networks, and services with practical hardening techniques designed for beginners.

Practical Linux firewall guide covering iptables, nftables, and firewalld. Learn secure rule design, hardening strategies, logging, cloud use cases, automation, and troubleshooting in real environments.

Deploy and manage OSSEC and Wazuh on Linux. Implement host-based intrusion detection, file integrity monitoring, active response, SIEM integration, and scalable security monitoring.

A practical Linux security auditing guide covering system baselines, auditd, permissions, SELinux, AppArmor, firewall audits, automation, and compliance verification.

Harden Linux systems for production use. Learn kernel security, access control, SELinux, AppArmor, firewalling, logging, intrusion detection, automation, and incident response with practical examples.

Secure Linux systems step by step. Harden SSH, users, permissions, services, networking, logging, auditing, intrusion detection, containers, kernel settings, encryption, and compliance across major distributions.

Master modern Linux firewalling with nftables. From your first nft command to building production-grade firewalls, gateways, and hardened servers — this hands-on guide takes you from beginner to expert with real-world examples.

Master SELinux and AppArmor with practical, real-world examples. Learn mandatory access control, policy creation, troubleshooting, service hardening, containers, and production security best practices.