Allow passing exposed port arguments to docker swarm service creation

[dhalik]

Hi! First time posting a feature request, please let me know if I'm missing any details or suggestions!

Proposed change

Add the ability to include network configuration attached to the SwarmSpawner similar to the mount configuration. E.g. the ability to expose port 6006 for tensorboard development on a random high port using the command line arguments --publish mode=host,target=6006 . More details available in docker docs

Who would use this feature?

Anyone who needs to run network servers inside the jupyter single user containers

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[minrk]

We already have SwarmSpawner.extra_endpoint_spec, which lets you pass through endpoints. Is that not sufficient for this?

[dhalik]

Thanks for the quick response @minrk! Yes this is exactly what I was looking for, but I didn't know that "endpoint" meant "port".

Thanks for the help!