Shameless self promotion - I just wrote up a little doc [1] on using Locust and Kubernetes to run and scale distributed load tests along with some sample code [2].
I looked at JMeter and Gatling as alternatives but they were either a bit clunky (JMeter) or not distributed out of the box (Gatling). Late in the game I did discover Tsung (Erlang) but didn't get time to try it out - looks pretty powerful though.
Great writeup.
It is so close to what we built at tradewave.net (except for Locust). I am glad I am not the only one that saw load testing using scalable containers. At some point, we will be going towards HFT and having a true load testing suite is handy.