writes SELinux lead Dan Walsh wrote last month that Docker "containers do not contain" and that the host system isn't completely protected. Today, Walsh details the steps that Docker, Red Hat, and the open source community are taking to make Docker more secure: "Basically, we want to put in as many security barriers to break out as possible. If a privileged process can break out of one containment tool, we want to block them with the next. With Docker, we are want to take advantage of as many security components of Linux as possible.
If "Docker" isn't a familiar word, the project's website is informative
; the very short version is that it's a Linux-based "open platform for developers and sysadmins to build, ship, and run distributed applications"; Wikipedia has a good explanation