First load CentOS 7 either on a VM or physical server.
After that is done IP your CentOS Server and SSH into the server via ip.
Install Nagios by using the following commands
1 . cd /tmp
2. wget http://assets.nagios.com/downloads/nagios-log-server/nagioslogserver-latest.tar.gz
3. tar xzf nagioslogserver-latest.tar.gz
4. cd nagioslogserver
5. ./fullinstall
Now that we finished the full installation using the script that was included in our tarball we now will navigate to the User Interface by
navigating to this URL:
http://<yourip>/nagioslogserver
Once this step is finished the server is up and ready to use it’s very easy.