With container solutions like Docker comes several opportunities, particularly in terms of bridging the gap between Dev and Ops. But there are also some new security aspects and complexity to consider if you plan to use Docker in production - especially if you want to use it in clusters. You need to think about security in several layers, and it is not only about operations. You will see examples of security threats and mitigations when using Docker, Kubernetes, Mesos, etcd and similar. You will learn how you can reduce the attack surface of your containers and clusters, and design secure systems from the attacker's perspective.