This is actually pretty easy. I’m doing this particular share for my media NAS, so that VLC on my phone can access it (only on android though, VLC can’t access NFS shares on iPhones last I checked).

Install dependencies.

apt-get install nfs-kernel-server nfs-common

Open the file that manages the shared NFS folders, and add a new line.

sudo nano /etc/exports

The new line should look like this:

/folder/to/share 192.168.1.1/24(ro,subtree_check,insecure,sync)

That’s a decent configuration to allow anyone connected to the local network (e.g., on the same home wifi connection) to access - but not edit - the contents of the shared folder.

Refresh the NFS shares, and then verify, and you’re done.

exportfs -r
exportfs -v