FreeBSD can run use LinuxJail to run a Ubuntu jail (it’s not a VM). I wonder why a billion $ company like docker can’t do this with Linux on macOS. It seems so obvious.

In the macos case, they actually are. docker runs in a vm on macos.

Actually, I believe one text file is the docker killer feature.

Nowhere in what makes a proper container does a VM come into play, unless we are speaking about Docker and the idea of shipping a full blown OS in a zip, to work across heterogeneous hardware.

Yeah so the Docker daemon on a Mac is run inside of a VM.

Because they bundle a x86 GNU/Linux package as a runtime.

It doesn't work bare metal for the new macs, and it is extra bloat instead of making use of macOS capabilities.

It doesn't work bare metal for any mac. It runs in a VM.

Too bad apple didn't help out docker with a macos native version.

  FROM macos:10.13.3 
  RUN xcode-build

would have been really useful