The programmability of the cloud has revolutionized infrastructure deployments at scale and, at the same time, has enabled the automation of both the attack and defense of these deployments. In this talk, I will discuss the open-source tools and the techniques that my organization has used to scale security in the cloud to keep pace with our deployments. I’ll also cover how we’ve used automation to adapt security processes to cloud strategies such as immutable servers. Some topics include: temporal leasing of API access keys and database credentials, automation of patching groups and scans, and automated enforcement of configuration policy.