Reachable at localhost, but not at localhost:3000?

[SyndicatedPillbug]

Hi! I'm hosting wiki.js via Docker and have no idea what I'm doing! Haha. I've it running just fine on localhost. However, when I try to access it via localhost:3000, or {my-ip-address}:3000, I just get a page that says "unable to connect." Since I need to have it accessible via the port in order to get tailscale funnel working, I'm a bit at a loss.

Linux Mint
Latest Wiki.js

[srd90]

Your wikijs'es port (3000) inside container is mapped to port 80 at host side thus you are able to connect to http://localhost ( aka http://localhost:80 ) but not to http://localhost:3000 or http://<your-ip-address>:3000

... I'm hosting wiki.js via Docker and have no idea what I'm doing! Haha. ...

FYI: https://docs.docker.com/reference/compose-file/services/#ports

You have option to change mapping from "80:3000" to "3000:3000" or change network_mode to host ( https://docs.docker.com/reference/compose-file/services/#network_mode ). Port mapping is ignored with host mode. Eitherway your service is then available via port 3000 instead of 80.

In case you have FW (e.g. firewalld) at your host you might want to understand / be aware of also this https://docs.docker.com/engine/network/packet-filtering-firewalls/ to understand whats happening behind the scene.

... Since I need to have it accessible via the port in order to get tailscale funnel working, I'm a bit at a loss.

It is already "accessible via the port". Number of the port is at the moment 80. HTTP protocol's default port is 80 and thats why you don't usually see port numbers at http urls. I.e. http://localhost:80 is equal to http://localhost

[SyndicatedPillbug]

Hey, thank you so-so much! This was an incredibly concise and yet supremely helpful answer, and it's going to help me out not with just Wiki.js, but my whole Docker journey.