Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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Another option is subpaths: xyz.ddns.net/portainer
Just one open port, to your reverse proxy (nginx or other).
The client updating no-ip with your dynamic IP is independent of the reverse proxy software.
While you can do that, you should be aware of the security implications (every application can see and modify every other application's cookies). If at all possible, I would try to avoid this setup.
I second that. This practice comes from a time where domain names were expensive, in many ways: SNI didn't exist/wasn't wide-spread, so each domain name on HTTPS needed a dedicated IP, Certificates weren't democratized yet via letsencrypt/acme and most hosts were big enough to run multiple services, because virtualization wasn't as widely available yet. So putting apps on sub-paths made sense.
Now all of those things are basically dealt with and putting each app on its own sub-domain just makes way more sense.