1 year back me and one of my friends bought raspberry pi 2 s. He had this crazy urge to build a raspberry cluster. So, we collected one more raspberry pi 2, so we had total of three, one master and two slaves. Then we had this wonderful tutorial on making a raspi cluser on tinkernut.com. So, we followed the steps there and finally after some tweaking it worked. Thats how i started by first raspi cluster.
I have a raspi 3 and have ubuntu in my laptop. So, basically i work in python and bash all the time. I use them individually or both combined to automate most of the tasks in my laptop and raspberry pi. My active area of interest is machine learning and data science, so i am quite familiar with many python modules plus i have good idea of compiling softwarea from source on linux platforms.