Learning Nagios 3.0 is a comprehensive configuration guide to monitor and maintain your network and systems. Nagios is a tool for system and network monitoring. It constantly checks other machines and various services on those machines. The main purpose of system monitoring is to detect and report any system not working properly as soon as possible—so that you are aware of problems before a user runs into them. It is a modular and flexible solution that uses plug-ins to do its job. The book is an introduction to Nagios that will teach readers to use Nagios with its advanced features. At the same time, readers who have already used earlier versions of Nagios will also benefit because they will learn about the new and advanced features of Nagios 3.