Search for available free ports if default port 8000 is not available

Thanks for the awesome tool! We are starting to use jupyterlab-nvdashboard on a multi-user HPC system. I am trying to figure out what will happen if two user jobs land on the same compute node and both users run the server in their job scripts as follows.

python -m jupyterlab_nvdashboard.server &

Will the first user get the default port 8000 and then the second user get an error or warning? Or will the jupyterlab_nvdashboard.server look for available ports?

[owenlamont]

Can this problem can be reproduced by running nvdashboard from two Python environments on the same system at the same time?

[davidrpugh]

The following will launch the Bash magic that extracts the port number using netstat. Seems brittle though and am not sure how to go about doing this from within Python.

python -m jupyterlab_nvdashboard.server 0 &
NVDASHBOARD_PID=$!
NVDASHBOARD_PORT=$( netstat -pl | grep $NVDASHBOARD_PID | tail -n 1 | awk -F "[ :]+" '{print $6}' )
echo "Your NVDashboard Server is running at $( hostname -f ):$NVDASHBOARD_PORT"