True Zero Downtime HAProxy Reloads: An Alternative Approach

Recently, this blog post circulated around the tech Twittersphere: http://engineeringblog.yelp.com/2015/04/true-zero-downtime-haproxy-reloads.html It’s an excellent write-up from Yelp about how to get truly zero downtime from HAProxy, which I recommend reading.  It’ll work for a lot of scenarios, but unfortunately, it doesn’t work for the one we experience at Unbounce.