How to Setup and configure Nagios

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1.0 About Nagios

Nagios is a system and network monitoring application. It watches hosts and services that you specify, and provides critical notifications to administrators, when the system/network performance is being negatively impacted.

Nagios was originally designed to run under Linux, but it possessess the capability of being compatible with a host of other OSs as well.

  • Some of the many features of Nagios include:
  • · Monitoring of network services (SMTP, POP3, HTTP, NNTP, PING, etc.)


  • · Monitoring of host resources (processor load, disk usage, etc.)


  • · Simple plug-in design that allows users to easily develop their own service checks


  • · Parallelized service checks


  • · Ability to define network host hierarchy using "parent" hosts, allowing detection of and distinction between hosts that are down and those that are unreachable


  • · Contact notifications when service or host problems occur and get resolved (via email, pager, or user-defined method)


  • · Ability to define event handlers to be run during service or host events for proactive problem resolution


  • · Automatic log file rotation


  • · Support for implementing redundant monitoring hosts


  • · Optional web interface for viewing current network status, notification and problem history, log file, etc.
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