(There are a large number of tutorials on Nagios. I found that some of the tutorials are somewhat different in presentation. It is estimated that some of them are copying, pasting and flying. I can't do it according to some statements. Today, I personally practice. The on-site snapshot allows you to see clearly and clearly, and what problems you encounter in the process and how to solve them will be shared with you. It's a little hard to write the snapshot. The key is that everything you can learn is worth dropping, Followme~!)