is there an API to find out how many kernels are running ?

[Thierry Parmentelat]

that's about it: I run a jupyterhub-like service, and would like to monitor the total number of open notebooks, so I'd need to figure how many kernels are running {within the scope of | spawned by} a given jupyter instance, if I have the wording right..

[MinRK]

The Hub doesn't track this information, but each notebook server does. To get it all, you would have to submit requests to each running notebook server and aggregate this information. It will only be accessible if `admin-access` is enabled, which will be easier with some auth changes upcoming in JupyterHub 0.8.

-Min

On Tue, Apr 4, 2017 at 2:24 PM, Thierry Parmentelat <thierry.p...@gmail.com> wrote:

that's about it: I run a jupyterhub-like service, and would like to monitor the total number of open notebooks, so I'd need to figure how many kernels are running {within the scope of | spawned by} a given jupyter instance, if I have the wording right..

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[Thierry Parmentelat]

Hi Min

Thanks for the tip

it was probably misleading that I mentioned jupyterhub, as I only wanted to give a sense of what we’re doing
so, to clarify, our deployment is jupyterhub-free, it’s our application that spawns and manages all the jupyter (container) instances, and I could easily probe each of them
it’s just that I don’t know the api call that I need to issue in order to get that info
is ‘admin-access’ a setting that applies to jupyterhub or to jupyter ?

> On 04 Apr 2017, at 15:11, MinRK <benja...@gmail.com> wrote:
>
> The Hub doesn't track this information, but each notebook server does. To get it all, you would have to submit requests to each running notebook server and aggregate this information. It will only be accessible if `admin-access` is enabled, which will be easier with some auth changes upcoming in JupyterHub 0.8.
>
> -Min
>
> On Tue, Apr 4, 2017 at 2:24 PM, Thierry Parmentelat <thierry.p...@gmail.com> wrote:
> that's about it: I run a jupyterhub-like service, and would like to monitor the total number of open notebooks, so I'd need to figure how many kernels are running {within the scope of | spawned by} a given jupyter instance, if I have the wording right..
>
>
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[Thomas Kluyver]

On 4 April 2017 at 14:18, Thierry Parmentelat <thierry.p...@gmail.com> wrote:

it was probably misleading that I mentioned jupyterhub, as I only wanted to give a sense of what we’re doing
so, to clarify, our deployment is jupyterhub-free, it’s our application that spawns and manages all the jupyter (container) instances, and I could easily probe each of them
it’s just that I don’t know the api call that I need to issue in order to get that info

If you have the IP address of the notebook server and the security token, you can find the kernels it has started by making an HTTP GET request to /api/kernels

API docs: https://github.com/jupyter/jupyter/wiki/Jupyter-Notebook-Server-API#kernel-api

Docs about token security: http://jupyter-notebook.readthedocs.io/en/latest/security.html

If you don't have the token already, the Python function notebook.notebookapp.list_running_servers() should give you all the information you need.

 

is ‘admin-access’ a setting that applies to jupyterhub or to jupyter ?

Admin access is a Jupyterhub thing. Access to a single Jupyter notebook server is all or nothing.

Thomas

[Thierry Parmentelat]

thank you so much !

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