Best way to reverse proxy CasaOS and multiple services with DuckDNS + NGINX Proxy Manager?

[ignaciobalaschsola]

Hi everyone! I’m new to CasaOS and self-hosting, so apologies if this is a basic question — I’m just trying to learn and get my setup right.

🧭 What I want to do:

I’d like to host multiple services on my Raspberry Pi 5 using CasaOS, and access them all remotely via custom subdomains through DuckDNS.

Ideally, I want:
• One subdomain (e.g. home.mydomain.duckdns.org) to point to the CasaOS dashboard
• Other subdomains (e.g. media.mydomain.duckdns.org, files.mydomain.duckdns.org) to point to apps I run inside CasaOS (like Jellyfin, Nextcloud, etc.)

Alternatively, I’d also be open to pointing a single domain to CasaOS and somehow routing users to the apps from there — if CasaOS supports something like that (users, app-specific access, etc.). Maybe this is better bc I don't want to spend a fortune on domains, especially since I was thinking of linking the duckdns domains to my personal domains.

✅ What I’ve done so far:
• I successfully connected DuckDNS to my setup.
• I can access CasaOS locally through server.local, and DuckDNS is resolving correctly.

❌ What I tried (and where I got stuck):
• I tried installing NGINX Proxy Manager in order to reverse proxy each service to a different subdomain.
• I realized NGINX needs port 80, but CasaOS was already using it.
• I tried overriding casaos-gateway.service to move CasaOS to port 8000, but it failed — I later realized the binary doesn’t support a --port flag.

⸻

❓So here’s my real question:

I’m looking for guidance — what’s the best way to achieve this setup?
• Should I be trying to move CasaOS to a different port?
• Should I run everything behind NGINX Proxy Manager, and forward to CasaOS internally?
• Or is there a more “CasaOS-native” way of doing this?

I’d love to hear how people who use DuckDNS + NGINX + CasaOS structure their home servers.
Thanks so much in advance!