The book examines how Linux systems behave in real-world ecosystems, not how they might behave in ideal environments. Difficult tasks are described in all their complexity, including DNS configuration, networking, sendmail configuration, security management, kernel building, performance analysis, and routing. The authors describe every aspect of Linux system administration and cover the following major Linux distributions: Red Hat Linux, SuSE Linux, Debian GNU/Linux. The book’s many true-life examples will help administrators implement solutions that continue to work effectively as their operations grow.”]
Source: https://www.amazon.co.uk/exec/obidos/ASIN/0130084662/helpnetsecuri-21