Let’s Build A Hadoop Cluster, Part 2

In part 1 of this series, we bought some hardware.  After patiently(?) waiting for it, we have the hardware and installed Ubuntu, so let's keep going. Docker?  I hardly even know her! Hadoop on Docker is a relatively new thing.  Thanks to Randy Gelhausen's work, the Hortonworks Data Platform 2.5 sandbox now uses Docker.  That has negative…