In Linux when you try to SSH it may at times give you this warning that REMOTE HOST IDENTIFICATION HAS CHANGED. It usually happens when the hostname or IP has changed of a host or the host was rebooted and generated a new fingerprint Key ID. No need to worry, it can be removed by a single command and you would be up and running in no time.

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Setup and Configuration guide for Nagios Core on any Fedora/Linux based OS (incl. CentOS & Red Hat). This guide would allow you to setup Nagios Monitoring Server up and running in roughly 15 mins. The process would involve installing yum packages and then compiling Nagios from source.

NOTE: You need to a be a ROOT user to compile and install Nagios Core.

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