Working with Nagios
Nagios is a system monitoring and alerting tool. This section will focus on configuring a simple Nagios installation that monitors the nodes in our Elasticsearch cluster, as well as the Elasticsearch process on those. If a node or process shuts down, Nagios will send us an alert.
It's a good idea to install Nagios on a host outside of the Elasticsearch clusters in order to avoid affecting the monitoring process due to other things going on in the system, such as high Elasticsearch load. Create a new host for Nagios and call it elasticsearc
h-nagios-01.
Installing Nagios
In addition to the dedicated Nagios host, elasticsearch-nagios-01, install the
Nagios Remote Plugin Executor (NRPE) server on all of the Elasticsearch cluster ...
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