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# NFS File Systems {#sec-nfs-file-systems}
[NFS][nfs] (Network File System) allows you to mount directories from remote machines over the network.
[nfs]: https://en.wikipedia.org/wiki/Network_File_System
[nfs-man]: https://man7.org/linux/man-pages/man5/nfs.5.html
To mount NFS filesystems persistently, use the `fileSystems` option:
```nix
{
fileSystems."/mnt/data" = {
device = "server.example.com:/export/data";
fsType = "nfs";
};
}
```
## Automounting {#sec-nfs-automount}
To have NFS filesystems mounted on-demand instead of at boot, add the `noauto` and `x-systemd.automount` options:
```nix
{
fileSystems."/mnt/data" = {
device = "server.example.com:/export/data";
fsType = "nfs";
options = [
"noauto"
"x-systemd.automount"
];
};
}
```
## Ad-hoc Mounting {#sec-nfs-adhoc}
To mount NFS filesystems ad-hoc using the `mount` command, enable NFS and required RPC services:
```nix
{
boot.supportedFilesystems = [ "nfs" ];
}
```
Then you can mount filesystems manually:
```shell
$ sudo mount -t nfs server.example.com:/export/data /mnt/data
```
For more information on NFS mount options, see the [nfs(5) man page][nfs-man].
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