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Operating-system level virtualization on FreeBSD
Operating-system level virtualization is available to a wide array forms on FreeBSD.
Jails
Jails have been a feature of since FreeBSD 4.X.
Application Containers
Docker and Jetpack application containers which have been ported and specifically tailored to FreeBSD.
Jetpack is an application container based on Jails, but follows the App Container Specification which is similar to Docker's way of using Dockerfiles.