Your own notebooks via sjupyter

Note

Now that Jupyterhub exists, this method of running Jupyter is not so important. It is only needed if you need more resources than JupyterHub can provide.

We provide a command sjupyter which automates launching your own notebooks in the Slurm queue. This gives you more flexibility in choosing your nodes and resources than Jupyterhub, but also will after your and your department’s Triton priority more because you are blocking others from using these resources.

Set up the proxy

When running Jupyter on another system, the biggest problem is always making the conenction securely. To do this here, we use a browser extension and SSH Proxy.

  • Install the proxy extension
    • Install the extension FoxyProxy Standard (Firefox or Chrome). Some versions do not work properly: the 5.x series for Firefox may not work, but older and newer does.
  • Create a new proxy rule with the pattern *int.triton.aalto.fi* (or jupyter.triton.aalto.fi if you want to connect to that using the proxy).
    • Proxy type: SOCKS5, Proxy URL: localhost, port 8123.
    • DNS through the proxy: on.
  • SSH to triton and use the -D 8123. This starts a proxy on your computer on port 8123. This has to always be running whenever you connect to the notebook.
    • If you are in Aalto networks: ssh -D 8123 username@triton.aalto.fi.
    • If you are not in Aalto networks, you need to do an extra hop through another Aalto server: ssh -D 8123 username@triton.aalto.fi -o ProxyCommand='ssh username@kosh.aalto.fi -W %h:%p'.

Now, when you go to any address matching *.int.triton.aalto.fi*, you will automatically connect to the right place on Triton. You can use Jupyter like normal. But if the ssh connection goes down, then you can’t connect and will get errors, so be aware (especially with jupyter.triton.aalto.fi which you might expect to always work).

Starting sjupyter

We have the custom-built command sjupyter for starting Jupyter on Triton.

To run in the Triton queue (using more resources), just use sjupyter. This will start a notebook on the interactive Slurm queue. All the normal rules apply: timelimits, memory limits, etc. If you want to request more resources, use the normal Slurm options such as -t, --mem, etc. Notebooks can only last as long as your job lasts, and you will need to restart them. Be efficient with resource usage: if you request a lot of resources and leave the notebook idle, no one else can use them. Thus, try to use the (default) interactive partition, which handles this automatically.

To run on the login node, run sjupyter --local. This is good for small testing and so on, which doesn’t use too much CPU or memory.