I used OpenVZ for a long time before Docker came along, it was certainly nicer than what I did previously (run everything right on the host) but, of the two, I'

I used OpenVZ for a long time before Docker came along, it was certainly nicer than what I did previously (run everything right on the host) but, of the two, I'd pick Docker every time. Dockerfiles, images, layers, thinking of containers as "application instances", the networking, the cli, the speed, there's nothign I miss from OpenVZ, even if it was good for what it was, the way Docker improved on it made a very big difference, in a positive way.