Neat. Anyone else at HN did something like this? Mine is at https://github.com/rcarmo/raspi-cluster (configs and some utilities included)
Code, tutorial, parts list, etc. here: https://github.com/geerlingguy/raspberry-pi-dramble
https://learnaddict.com/2015/08/03/raspberry-pi-stack-a-plat...
http://www.datastax.com/dev/blog/32-node-raspberry-pi-cassan...