[nl]

LXC and FreeBSD Jails are almost completely comparable[1]. LXC does indeed attempt to provide a security wrapper, in (very) roughly the same way jails do.

Indeed, dotcloud (ie, Docker before it was Docker) were using LXC as a security measure to isolate clients inside their PAAS (see pg 8 of [2])

It has long been speculated that it would be possible to port the Docker API to other container mechanisms.

Personally I don't think this should be a priority - I'd much prefer Docker put all their resources behind building the best experience possible on a single platform.

Nevertheless, asking about it is a valid question.

[1] http://en.wikipedia.org/wiki/LXC#Alternatives "LXC is similar to other OS-level virtualization technologies on Linux such as OpenVZ and Linux-VServer, as well as those on other operating systems such as FreeBSD jails, AIX Workload Partitions and Solaris Containers."

[2] http://www.slideshare.net/jpetazzo/is-it-safe-to-run-applica...