TrueNAS SCALE 25.10 - Inter-App Communication

Apps and Virtualization
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Hello,

I couldn’t find anything by searching for the 25.10 version. I apologize if this WAS asked before.

I am trying to understand how to configure inter-app communication in TrueNAS SCALE 25.10. I see that the option has been made available (“Expose port for inter-app communication”), however I do not know how to actually configure it.

I am attempting to swap from NPM to Caddy for a little bit more ease-of-use. When I setup the Caddyfile with the “reverse_proxy” option set to, for example, emby (the name of the Emby container), it doesn’t work.

I’ve tried:

reverse_proxy http://emby:8096

reverse_proxy emby:8096

reverse_proxy 127.0.0.1:8096

Unfortunately it doesn’t work.

With NPM on 25.04, I used the NAS’s IP address to route it to the gateway and then back. I would prefer to stay away from that if inter-app communication is indeed available.

Does anyone know how to actually get this configured properly? Is it via the add docker networks option in the network section of the app?

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Thank you for your assistance.

2

Generally, if you want containers in different stacks talking to each other, they have to share a common docker network.
I am not using the TrueNAS’s app infrastructure (I am using docker compose directly), so I cannot look at the details, but seeing the screenshot, I’d try to click on Add, create a network called e.g. reverse-proxy, and add both caddy and emby to it.