1. Basic Nagios Architecture

The basic Nagios set-up consists of a central server - the "Nagios Server" - that polls the Hadoop servcies and components in the cluster installation to check for one of the following states:

  • OK

  • Warning

  • Critical

Nagios writes its output to a status log, /var/nagios/status.dat. The alert information from that file is periodically collected and displayed in Ambari Web. For more details on Nagios architecture, see the Nagios Overview at the nagios.org web site.


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