Now that you have your own NTP servers up and running (such as some Raspberry Pis with external DCF77 or GPS times sources) you should monitor them appropriately, that is: at least their offset, jitter, and reach. From an operational/security perspective, it is always good to have some historical graphs that show how any service behaves under normal circumstances to easily get an idea about a problem in case one occurs. With this post I am showing how to monitor your NTP servers for offset, jitter, reach, and traffic aka “NTP packets sent/received”.
