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OpenVZ was an early container implementation that required patches to the Linux kernel that never made it into mainline. Parallels acquired the company behind OpenVZ, Virtuozzo, and then worked to mainline much of the functionality into what are now Linux namespaces.

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Oh really? I didn't know that namespaces is linux are the openvz changes. Thought they were a completely new implementation mostly driven by Google?

They aren't, but share some similarities. OpenVZ can be considered an inspiration for LXC. (Which was mostly implemented by RedHat and not Google.)

Correction. The LXC project was mainly Daniel Lezcano and Serge Hallyn from IBM. Then some cgroup support from Google. And then Canonical hired Serge Hallyn and Stephane Graber to continue work on LXC around 2009 where they have continued to develop it till today. Docker based off LXC in 2013.

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