Yes, Docker builds on top Linux containers but they seem to be releasing some neat features that make containers easier to use, manage, and reuse. For example: The docker-cluster project, https://github.com/globocom/docker-cluster seems very interesting as it might allow you to abstract the host with a cluster/logical group. Having this abstraction is key if you are running docker on a non-virtualized (bare metal) host because it provides some level of fault-tolerance against hardware failures. Can you do that with Linux Containers?

Edit: I just realized that docker clusters is not being developed by the docker team