Selfhosted

Okay so TLDR I'll need to set up a reverse proxy. Thanks folks!

I would suggest using Caddy. I think it’s a little simpler than Traefik and can automatically handle LetsEncrypt SSL/TLS certificates for you

if you are using docker/podman you can use e.g traefik reverse proxy.

if you don't use docker you Have to move those Services behind an apache/nginx/haproxy reverse proxy.

Setup a reverse proxy and configure it to redirect yourdomain.org/nextcloud (or nextcloud.yourdomain.org) to a custom port that you're now running Nextcloud on. Then configure some-random-service which you want at yourdomain.org/some-random-service to redirect to port 1234 and so on.

This means all incoming connections on port 80 and 443 now will be handled by your reverse proxy and depending on the requested URL, the reverse proxy will fetch the desired website contents from the origin web server. I personally use nginx but there exists other good reverse proxies you can use.

Depends on how your infra is setup but if you're using a reverse proxy you can do it fairly easily. This example is assuming cloudflare as its what I use.

Go into cloudflare -> dns then add cname records for your services. The cname record should be service.mydomain.com. Then all you gotta do is tell your proxy what that cname points to. Gonna be honest, been using truenas scale for a while and it does it differently that straight docker which I assume you're using so I probably wont be much more help but it should at least get you started. If you aren't using a reverse proxy, you should definitely start. Look up Traefik.

Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I've seen in this thread:

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You want a reverse proxy. But if nextcould is already reserving ports 80/443 you need a bit more configuration as it's not possible for multiple processes to use the same port.