We are new user of Discourse. We tried to install both of wordpress website at main domain and discourse at forum subdomain by Docker on the same server Ubuntu 18.04; I pointed DNS A record of main domain and another A record of forum subdomain to the server IP.
When I entered example.com on the browser, we came to see the famous 5-minute Wordpress installation page. That is good.
However when type forum.example.com into the browser, it is still the famous 5-minute Wordpress installation page.
Unfotunately we are not able to have the Discourse startup page. Maybe the problem with DNS part?
We are wondering if we also need to install Nginx so as to apply for Let’s Encrypt SSL certificate.