How to set up secure NFS for two servers?

Question

Debian

Good afternoon!
There are 2 servers (Ubuntu Server) in different data centers (there are dedicated ip for each server), we need to set up a connection between us so that they see each other's folders as their local folders. When the servers were in the same rack, I raised NFS (which was fine).
The question is - is there a "secure" NFS so that no one from the internet can access the files?
PS In the search engine, I myself can search (which I have already done), I want advice on the topic and from a specialist - what can be the pitfalls of this or that decision? Maybe it's easier to raise openvpn?

Answer 1

sshfs

Answer 2

And what about the same NFS over a vpn tunnel that does not suit you?
In NFS, you can restrict access to ip-addresses. The bad thing is that the traffic is not encrypted.
Well, all this will be slow enough (with VPN, without, with sshfs).