The rest of this section will concentrate on several other security features that are unique to FreeBSD. The first of these is jail(8).

Whereas a chroot is used to imprison a process, a FreeBSD jail is used to partition the operating system. The jail provides a full operating system environment where applications can be installed, configured, and allowed to execute. However, whatever happens within that jail does not affect the host operating system or any other jails running on that host. Jails are popular with ISPs as they can provide virtual environments to customers that are securely separated from other customers' environments.

The sysjail project (http://sysjail.bsd.lv/) provides a jail subsystem for OpenBSD and NetBSD.

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