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submitted 1 month ago by [email protected] to c/[email protected]

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Hi all,

I've been going through a guide by techhut for setting up gluetun, and there's a small bit of code that he adds in from his github, and I want to understand the implications of using it.

He writes:

When containers are in the same docker compose all you need to add is a network_mode: service:container_name and open the ports through the gluetun container. See example from the compose.yaml below.

And here's the code: services: gluetun: # This config is for wireguard only tested with AirVPN image: qmcgaw/gluetun container_name: gluetun ... ports: - 8888:8112 # deluge web interface - 58846:58846 # deluge RPC deluge: image: linuxserver/deluge:latest container_name: deluge ... network_mode: service:gluetun

If you could please explain to me what this means, and if there are any risks associated with this, I would really appreciate it.

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[–] [email protected] 4 points 1 month ago (1 children)

Any ports used in docker will be open on your computer and accessible to any device in your network.

However, to open up a port to the internet, you'd have to do port-forwarding on your router. If you haven't done that, any incoming connections will just be dropped at the router-level.

[–] [email protected] 5 points 1 month ago (1 children)

Assuming they use NAT. Almost certainly true for IPv4, very unlikely for IPv6. And you should have a firewall too.

[–] [email protected] 3 points 1 month ago

Exactly. I have my firewall set up to block everything I don't explicitly allow through. That way if I'm a little loose with running things on ports, it at least won't leak ports past the firewall.