Continuous Integration / Continuous Delivery (CI/CD) is a well established practice in the software engineering of applications. With the advent of the cloud and OpenStack, new challenges have arisen in how best to apply those patterns to the infrastructure upon which those applications are running. Add the unique challenges posed by consuming an open source code base, and the opportunities for innovation and creative solutions are great. In this talk, members of Rackspace's Deployment System Team will cover how they have adapted CI/CD patterns and principles to maintain the infrastructure of their public cloud offering (compute, networks, images.) The discussion will offer a look into the evolution of the deployment process of a large-scale OpenStack cloud, as well as the tools used to achieve the current level of automation around the consumption and deployment of upstream OpenStack code. The talk will conclude with an overview of ongoing efforts to continually improve and automate the interaction between the physical capacity of the cloud and the software bits that enable virtual instances to be created.