===== Operating-system level virtualization on FreeBSD =====

[[https://en.wikipedia.org/wiki/Operating-system-level_virtualization|Operating-system level virtualization]] is available in a few different ways on %%FreeBSD%%.

==== chroot ====

%%FreeBSD%% provides support for [[https://en.wikipedia.org/wiki/Chroot|chroot]] via [[https://www.freebsd.org/cgi/man.cgi?chroot(8)|chroot(8)]]. This utililty changes the root directory of the current process, such as a terminal, and all child processes created within it.

==== Jails ====

[[Jails]] have been a feature of since %%FreeBSD%% 4.X. Its a far more comprehensive solution compared to chroot. Whereas chroot only deals with the file system aspect of the operating system, jails are similar to running a sandboxed %%FreeBSD%% system, with its own processes, files, users and is nearly indistinguishable from the real OS.

==== Application Containers ====

[[Docker]] and [[AppContainers#Jetpack|Jetpack]] [[AppContainers|application containers]] which have been ported and specifically tailored to %%FreeBSD%%.

Jetpack is an application container based on [[Jails]], but follows the [[https://github.com/appc/spec|App Container Specification]] which is similar to Docker's way of using Dockerfiles.