I'm guessing that this Lambda functionality is built on the new ECS (EC2 Container Service) which is built on Docker. Therefor, it should be reasonably doable

I'm guessing that this Lambda functionality is built on the new ECS (EC2 Container Service) which is built on Docker. Therefor, it should be reasonably doable to recreate it on-premises and escape the AWS lock-in. "should" being the operative word there. :)