Selfhosted

I would probably just skip the Lemmy Easy Deploy and just do a regular deployment so it doesn't mess with your existing. Getting it running with just Docker is not that much harder and you just need to point your NGINX to it. Easy Deploy kind of assumes it's got the whole machine for itself so it'll try to bind on the same ports as your existing NGINX, so does the official Ansible as well.

You really just need a postgres instance, the backend, pictrs, the frontend and some NGINX glue to make it work. I recommend stealing the files from the official Ansible, as there's a few gotchas in the NGINX config as the frontend and backend share the same host and one is just layered on top.

They can if they're using different ports, however, I'd recommend just running Lemmy through the nginx server and route the data to each as needed. There's nginx configuration in the guide.

Yunohost supports Lemmy https://apps.yunohost.org/app/lemmy

You can use nginx just fine, probably need to skip the automatic deployment though.

If you’d like to run them on the same Ubuntu VM, I’d recommend deploying them using docker, as that will make avoiding port conflicts much easier as well as keeping each application isolated.

You should also look into a reverse proxy so you can reroute traffic from your desired subdomain to non-standard ports (otherwise you’ll need to specify ports in the URL which gets weird). I recommend Nginx Proxy Manager which can also run in docker.

You could spin up another VM for Lemmy if resources get tight and you don’t mind the extra cost.

I read someone saying the bandwidth is costly.