Contents -- Introduction -- From Source Code to a Running Installation -- Installation -- Nagios Configuration -- Startup -- In More Detail . . . -- Nagios Basics -- Service Checks and How They Are Performed -- Plugins for Network Services -- Testing Local Resources -- Manipulating Plugin Output -- Executing Plugins via SSH -- The Nagios Remote Plugin Executor (NRPE) -- Collecting Information Relevant for Monitoring with SNMP -- The Nagios Notification System -- Passive Tests with the External Command File -- The Nagios Service Check Acceptor (NSCA) -- Distributed Monitoring -- The Web Interface -- Graphic Display of Performance Data -- Special Applications -- Monitoring Windows Servers -- Monitoring Room Temperature and Humidity -- Monitoring SAP Systems -- Appendixes -- Rapidly Alternating States: Flapping -- Event Handlers -- Writing Your Own Plugins: Monitoring Oracle with the Instant Client -- An Overview of the Nagios Configuration Parameters -- Index.