About: What is Nagios Core?; System requirements; Licensing; Downloading the latest version
Release Notes: What's new in this version; Known issues
Support: Nagios Library - Nagios tips, tutorials, documentation, and manuals; Support Forum - Community and customer Nagios support forum; More Options - Community and commercial support options
Getting Started: Advice for beginners; Quickstart installation guide; Upgrading from previous versions; How to monitor a Windows machine; How to monitor a Linux/Unix machine; How to monitor a Netware server; How to monitor a network printer; How to monitor a router/switch; How to monitor a publicly available service (HTTP, FTP, SSH, etc.)
Configuring Nagios: Configuration overview; Main configuration file options; Object configuration overview; Object definitions; CGI configuration file options; Configuring authorization for the CGIs
Running Nagios: Verifying your configuration; Starting and stopping Nagios
The Basics: Plugins; Macros and how they work; Standard macros available in Nagios; Host checks; Service checks; Active checks; Passive checks; State types; Time periods; Determining status and reachability of network hosts; Notifications; Information on the CGIs
Advanced Topics: External commands; Event handlers; Volatile services; Service and host result freshness checks; Distributed monitoring; Redundant and failover monitoring; Detection and handling of state flapping; Notification escalations; On-call notification rotations; Monitoring service and host clusters; Host and service dependencies; State stalking; Performance data; Scheduled host and service downtime; Using the embedded Perl interpreter; Adaptive monitoring; Predictive dependency checks; Cached checks; Passive host state translation; Check scheduling; Custom CGI headers and footers; Object inheritance; Time-saving tips for object definitions
Security and Performance Tuning: Security considerations; Enhanced CGI security and authentication; Tuning Nagios for maximum performance; Fast startup options; Large installation tweaks; Using the nagiostats utility; Graphing Nagios performance statistics
Integration With Other Software: Integration Overview; SNMP Traps; TCP Wrappers
Nagios Addons: NRPE; NSCA; NDOUtils; Other addons; Nagios Exchange
Development: Plugin API; Developing Plugins For Use With Embedded Perl

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