It's LXC. LXC has been around since 2008 (before Docker existed, since Docker builds atop it). And LXC isn't tied to a for-profit company, so RHEL would be more likely to include it.
"Enhanced application development, delivery, portability and isolation through Linux Containers, including Docker, across physical, virtual, and cloud deployments as well as development, test and production environments."
I stand corrected. I read three different release notes on it and all of them mentioned LXC without mentioning Docker.
Actually it's Docker :)
Was my thoughts exactly. Seems odd to put Docker into a RHEL release, especially since docker only 1.0'ed yesterday. RHEL usually goes for rock solid stable (typically older/matured) packages... LXC seems the natural fit... I could see Docker in RHEL 8 or something...
We have been working with redhat for months. They're amazingly active maintainers of Docker.
RHEL can go years without seeing a major version increase. In between now and then, a lot of people are going to want to use containers, including Docker. If RHEL doesn't support them, people are going to use Debian/Ubuntu/CoreOS/etc. instead. So Red Hat is supporting them. They know Ubuntu has a head start on them in the cloud, and they do not want to let them widen that gap.
Docker was added to RHEL 6. Red Hat can move faster than you think. :-)