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Not Docker. Linux containers (LXC). They predate Docker by a couple years. Docker is app-focused whereas LXC is more machine focused. Docker uses LXC as an underlying technology making them easier to use for deploying apps. Docker is the current poster-child for containers, but most containers are not Docker and containers have existed for years in multiple forms.

No, explicitly Docker (which includes Linux containers) - see http://www.redhat.com/about/news/press-archive/2014/6/red-ha.... Actually Docker was added post-release to RHEL 6, but it's there out of the box in RHEL 7.

I stand corrected. I read three different release notes on it and all of them mentioned LXC without mentioning Docker.

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No he hasn't. He's posted duplicate posts - the latest one shows as dead.

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