Pro Nagios 2.0 is a comprehensive professional book that focuses on the installation and management of Nagios, a web-based enterprise management tool. This book is aimed at professionals who want to learn how to effectively use Nagios to monitor Unix and Windows systems, network devices, as well as infrastructure components and applications. It provides detailed guidance on the architecture of Nagios installations, the deployment of agents and plugins, and the monitoring of a variety of assets across different platforms and operating systems. The book also addresses Nagios's ability to alert users to current and future incidents that could affect the availability, performance, and security of the monitored assets. The hands-on configurations and supporting materials in the book enable a step-by-step implementation of Nagios and integration with other tools to enhance functionality.