Cannot connect to more than one network

[oskardotglobal]

In a docker run command you cannot specify multiple networks: https://stackoverflow.com/questions/60301221/docker-container-cannot-be-connected-to-network-endpoints

However, when specifying multiple networks with compose2nix, the --network flag is appended twice, which leads to the container not starting.

[aksiksi]

Thanks for reporting. Can you share the output of docker version?

[aksiksi]

Because according to moby/moby#35543, multiple networks are supported as of Docker v25.0.0.

You can override the Docker version using the package option (set it to pkgs.docker_25): https://search.nixos.org/options?channel=24.05&show=virtualisation.docker.package&from=0&size=50&sort=relevance&type=packages&query=++++virtualisation.docker.package

[oskardotglobal]

Yup, this is on Docker v24.0.9. Maybe mention this in the readme somewhere?

[aksiksi]

Actually, the Docker fix I referenced above might not be working... I think I hit the same error when trying to update the integration test to use multiple networks with docker_25.

There might be a way to fix this: add a PostStart hook that runs docker network connect ... for the additional networks. This can be achieved using systemd PostStart, but the tricky part is how to keep the container stopped until the container is connected to all networks.