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How to Install Nagios 4 in Ubuntu and Debian

By Ravi Saive

Nagios Core is a free Open Source network monitoring application designed for monitoring network applications, devices and their related services and in a network. Nagios can remotely monitor specific operating system parameters via agents deployed on nodes and send alerts via mail or SMS in order to notify administrators in case critical services in a network, such as SMTP, HTTP, SSH, FTP and other fails.

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