vagrant/website/docs/source/v2/synced-folders/nfs.html.md

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---
page_title: "NFS - Synced Folders"
sidebar_current: "syncedfolder-nfs"
---
# NFS
In some cases the default shared folder implementations (such as VirtualBox
shared folders) have high performance penalties. If you're seeing less
than ideal performance with synced folders, [NFS](http://en.wikipedia.org/wiki/Network_File_System_%28protocol%29)
can offer a solution. Vagrant has built-in support to orchestrate the
configuration of the NFS server on the host and guest for you.
<div class="alert alert-info">
<p>
<strong>Windows users:</strong> NFS folders do not work on Windows
hosts. Vagrant will ignore your request for NFS synced folders on
Windows.
</p>
</div>
## Prerequisites
Before using synced folders backed by NFS, the host machine must have
`nfsd` installed, the NFS server daemon. This comes pre-installed on Mac
OS X, and is typically a simple package install on Linux.
Additionally, the guest machine must have NFS support installed. This is
also usually a simple package installation away.
If you're using the VirtualBox provider, you'll also need to make sure you
have a
[private network setup with a static IP](http://localhost:4567/v2/networking/private_network.html). This is due to a limitation of VirtualBox's built-in networking. With
VMware, you do not need this.
## Root Privilege Requirement
To configure NFS, Vagrant must modify system files on the host. Therefore,
at some point during the `vagrant up` sequence, you may be prompted for
administrative privileges (via the typical `sudo` program). These
privileges are used to modify `/etc/exports` as well as to start and
stop the NFS server daemon.
## Enabling NFS Synced Folders
To enable NFS, just add the `type: "nfs"` flag onto your synced folder:
```ruby
Vagrant.configure("2") do |config|
# ...
config.vm.synced_folder ".", "/vagrant", type: "nfs"
end
```
If you add this to an existing Vagrantfile that has a running guest machine,
be sure to `vagrant reload` to see your changes.
## NFS Synced Folder Options
NFS synced folders have a set of options that can be specified that are
unique to NFS. These are listed below. These options can be specified in
the final part of the `config.vm.synced_folder` definition, along with the
`type` option.
* `nfs_udp` (boolean) - Whether or not to use UDP as the transport. UDP
is faster but has some limitations (see the NFS documentation for more
details). This defaults to true.
* `nfs_version` (string | integer) - The NFS protocol version to use when
mounting the folder on the guest. This defaults to 3.