Once signed up with Nodequery.com, you create a new server which will prompt you to fill in your server's domain name or hostname. You will then be given a curl bash one line command to run as root user in SSH session on your server. This installs the monitoring agent which does all the statistics gathering and information data transfer to the service.
Then wait a few minutes for the initial data stream to start working
Removal of Nodequery agent is also easy via SSH command line