Setup discourse.domain.com with main site at domain.com

[geoff777]

The standard set up for what you want to achieve is two servers.

I believe it is achievable on the same server … I’ve never tried it. Good luck.

Set up Discourse on a server with existing Apache sites

It’s not as daunting as it sounds! While this may sound a bit intimidating at first, it’s really not all that bad. You basically need to do two things: Install HAProxy (or an alternative) which will take over port 80 and then divert your Discourse traffic to your docker container, and all your other sites to your usual Apache set-up. Let Apache know which port to listen for. While this is only a rough guide, it should do a good job of pointing you in the right direction. Let’s get star…

@epsteindidnt

My client probably doesn’t want to pay to run a 2nd server for what he views as one website.

You need to educate your client that root and any subdomains are different websites.
Especially if they expect to grow visitor numbers.