You're viewing the documentation for the experimental version of Vagrant (the 1.x series). The current stable series is 1.0.x and the documentation can be found here. You can learn more about the Vagrant versioning scheme here.
Configuration key: config.vagrant.host
Default value: :detect
There are some things that Vagrant does that requires some host-specific behavior, such as exporting NFS shared folders. This sort of action differs from Mac OS X to Linux. This configuration parameter tells Vagrant what sort of host it is running on. By default, this is set to :detect and Vagrant will do its best to figure out on its own. Available values that are built-in to Vagrant are:
:arch:bsd:fedora:freebsd:gentoo:linux:opensuse:windowsNote that some of the values overlap (such as :linux and :fedora). In these cases, please pick the most accurate available value.