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The objective of this paper is to present an advanced use of Nagios core on Raspberry Pi to monitor a network. Nagios is a popular network monitoring software. Raspberry Pi is a tiny, inexpensive but powerful computer board with many applications. In this work the free version of Nagios has been installed on a Raspberry Pi in order to minimise cost. Bash scripts automating the complex processes of installing Nagios server software on Raspberry Pi, as well as Nagios client software on Linux hosts have been developed. In order to elevate the security level of Network monitoring, a triple set of Raspberry Pi Nagios servers has been proposed; each Raspberry Pi monitors hosts and servers, as well as the other two Nagios servers (triple modular redundancy). Custom scripts providing useful information about monitored hosts, such as their operating system, hardware and networking. Finally, a special script examining and rating the security level of Apache web servers has been developed and incorporated into the network monitoring process. Key-Words: Network monitoring, Raspberry Pi, Nagios Server, NRPE, Apache Web Server, plugins, custom scripts, triple modular redundancy.

Using Nagios on a Raspberry Pi to Monitor Anetwork with Emphasis on Security