Monitoring My Pi Cluster WIth Nagios, Part 1 - Installing

This will hopefully be Part 1 of the story. BTW - It seems to be pronounced Nah - gee (as in geese) - ose. I installed this on a pine64 to monitor my Pi network (4- Pi3s with MySQL5.7 servers, and 1 Pi2 running Zookeeper) and to learn how to use it.

I know this is going to be like "somebody who's played racquetball 3 times teaching someone else to play for the first time", but here goes:

HT RiffTrax Ator the Fighting Eagle