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Brilliant! I totally forgot about boot2docker. I remember it from when the Docker tooling on macOS was rough.

I didn't notice the docker client was in the ports tree. I may have to give this a go later this week.

You can also use LinuxKit[1] on OpenBSD I believe; this is what we now use to build Docker for Mac and we are continuing to open source this code.

EDIT: we have an openbsd developer on the team that built LinuxKit and Docker for Mac, so we should be able to help fix any issues...

Ultimately a good way to make this easier may be to use docker-machine and write some docker-machine-driver-vmm, like there is for e.g xhyve[0].