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Docker is a management tool for the underlying jail-like features implemented by the kernel (cgroups, mainly). There's no reason why it can't be used to manage *BSD jails, ie., create jails from Dockerfiles, download jail templates from a public repository, etc.

> Docker is a management tool for the underlying jail-like features implemented by the kernel...

ezjail[1] manages FreeBSD jails quite nicely too. Paired with ZFS, the GP makes a solid case IMHO.

1 - https://www.freebsd.org/doc/handbook/jails-ezjail.html

What you don't get is 100% compatibility with all the Docker containers out there.

Docker is not a "jails" clone. (Linux has had "jail" like containers, called LXC, for almost 10 years now.)

Docker runs on top of lxc if I am not mistaken.

It used to run on top of lxc but it was replaced by https://github.com/opencontainers/runc if I'm not mistaken.

Not anymore - it used to. Still uses Linux namespaces and changeroots.