ERPNext cluster project


Can someone help me with my issue?

I am working on an ERPNext project. My setup involves having all components and tools of the ERP in the internal network, with only the Nginx service moved to the DMZ.

What I did:

Installed ERPNext on one internal server. I am able to access it without any problem (includes nginx).
Installed a new Nginx service on my Ubuntu server in the DMZ.
Copied the configuration and pointed the server to my internal network on port 8000.
For now I am working on this guide, I am trying to install proxysql just to point the internal server properly

Kindly advise. Thank you so much

upstream frappe-bench-frappe {
server :8000 fail_timeout=0;

upstream frappe-bench-socketio-server {
server fail_timeout=0;