Discourse Docker + Other Rails App on the same droplet

Product Support Self-hosting
3

It is also doable with nignx as well, using multiple server {} blocks, and matching the proxy by server_name.

something like:

server {
  listen 80;
  server_name www.mysite.com;
  location / {
    proxy_pass http://localhost:4567/; #your rails app port
  }
}
server {
  listen 80;
  server_name forums.mysite.com;
  location / {
    proxy_pass http://localhost:8080/; #your discourse port as seen by the host
  }
}