For security reasons, Domino workspace sessions are only accessible on one port. For example, Jupyter typically uses port 8888. When you launch a Jupyter workspace session, a Domino executor starts the Jupyter server in a Run, and opens port 8888 to serve the Jupyter application to your browser. If you used the Jupyter terminal to start another application on a different port, it would not be accessible.
However, you might want to run multiple applications in the same workspace session. For example, you might want to:
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Edit and debug Dash or Flask apps live.
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Use Tensorboard to view progress of a live training job.
Domino supports this with Jupyter Server Proxy and JupyterLab.
By default, Domino standard environments have Jupyter Server Proxy installed. If you are not on the recent version of the Domino Standard Environment, use the following steps to install it in your Domino environment.
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Add the following lines to your environment’s Dockerfile Instructions.
# Install NodeJS # You can omit this step if your environment already has NodeJS 6+ installed RUN curl -sL https://deb.nodesource.com/setup_8.x | bash - && apt-get install nodejs -y && rm -rf /var/lib/apt/lists/* # Switch to the latest JupyterLab start script RUN rm -rf /var/opt/workspaces/Jupyterlab/start.sh && cd /var/opt/workspaces/Jupyterlab/ && wget https://raw.githubusercontent.com/dominodatalab/workspace-configs/2019q4-v1/Jupyterlab/start.sh && chmod 777 /var/opt/workspaces/Jupyterlab/start.sh # Install and enable jupyter-server-proxy RUN pip install --upgrade jupyterlab==0.35.4 && pip install nbserverproxy jupyter-server-proxy && jupyter serverextension enable --py --sys-prefix nbserverproxy && jupyter labextension install jupyterlab-server-proxy -
Update the JupyterLab definition in the Pluggable Workspace Tools section of your environment.