I have Mastodon running on a VPS running Debian 11. Now I would like to add a Lemmy instance on the same server. I tried using the from scratch method from Lemmy documentation, but ran into errors that likely stemmed from minor version incompatibilities of the dependencies. I tried using the Lemmy easy deploy script but it wants to bind all traffic on port 443 for Lemmy which would break my Mastodon install. Has anyone managed to get Lemmy and Mastodon running on the same box, and if so, can you share any details of your setup?
I found it easiest to get them running on docker. The documentation wasn’t FANTASTIC, but it got me there in the end.
Then I have nginx proxy manager running in another docker container, which handles the virtual hosts for me. It’s the one actually bound to 80 and 443. Will help you get set up with SSL certs easily, too.