If you want to grant Vagrant the ability to edit your /etc/exports file for NFS shares, there is a short write up on the official Vagrant website for OSX.
However, a few details are left out - particularly...
vagrant
Whoa there!
This post will be applicable to you if you develop within a Vagrant virtual environment in OSX/Linux. If not, or you are a Windows user, it may not be much help! But if you're curious anyway, read on.The Initiation
Why you came.
Alright...