IDG Contributor Network: How to make containers more secure

Matthew Garrett, principal security engineer at CoreOS, is one of the most respected names in the Linux world when it comes to security and cloud computing. I sat down with Garrett at CoreOS Fest to discuss the risks around containers and Linux in general. Here is an edited version of that discussion.
Lately we've been hearing a lot about container security. What are the risks involved with containers and what are open source projects like CoreOS doing to mitigate them?
Security is of a special