How to forward a UDP port from a devcontainer?

user_12620541 0
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I'm trying to use the "Node.js & Mongo DB" devcontainer from Microsoft (https://github.com/microsoft/vscode-dev-containers/tree/main/containers/javascript-node-mongo/.devcontainer) with my udp server made in Nodejs.

The problem is as follows: When i try to forward a port in devcontainer.json example : "forwardPorts": [1117].

It seems to only forward 1117/tcp when i actually want to forward 1117/udp.

I'm trying to making this work for this project : https://github.com/QuentinGruber/h1z1-server/blob/master/.devcontainer/devcontainer.json

vscode-devcontainer dockerfile docker-compose visual-studio-code docker
2 Answers

The documentation is kinda fuzzy regarding protocols used for exposed ports with forwardPorts tag:

forwardPorts

  • array
  • An array of ports that should be forwarded from inside the container to the local machine.

Because of that I would recommend trying to use the older appPort tag because when I looked here it said they're using the docker-compose syntax which means you can specify the ports and protocol like so:

docker-compose:

ports:
- "3000"
- "8921:5000"

devcontainers.json:

"appPort": [ 3000, "8921:5000" ]

And in your case:

"appPort": [ "1117:1117/udp" ]

According to the docs, using the appPort tag is also useful when you want to access the application (or expose the ports) to more than just localhost

user_54596400

Fllowing the documentation you can forward udp protocol with this line

docker run -p 53160:53160/udp docker/getting-started

So trying add this to your configuration file and should works.

References: docker network

user_73271140
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