Project Titus is Netflix's container runtime on top of Amazon EC2. Titus powers algorithm research through massively parallel model training, media encoding, data research notebooks, ad hoc reporting, NodeJS UI services, stream processing and general micro-services. As an update from last year's talk, we will focus on the lessons learned operating one of the largest container runtimes on a public cloud. We'll cover the migration we've seen of applications and frameworks from VM's to containers. We will cover the operational issues with containers that only showed after we reached the large scale (1000's of container hosts, 100's of thousands of containers launched weekly) we are currently supporting. We'll touch base on the unique features we have added to help both batch and microservices run across a variety of runtimes (Java, R, NodeJS, Python, etc) and how higher level frameworks have taken avantage of Titus's scheduling capabilities.