Jupyter architecture and kernel development and extensibility...

[john alexander sanabria ordonez]

Hello,

I would love to have a more clear idea about Jupyter's architecture because I want to know:

1. what is the role of kernels in Jupyter (how is the interaction with other components)?
2. How to develop other kernels to interface with other tools, e.g. network tools (GNS3) and virtualization tools (Docker).

Thanks,

[Thomas Kluyver]

Hi John,

Kernels are the parts that run your code, and handle other things specific to the language, like tab completion. Here's some information about how to make a new kernel:

http://jupyter-client.readthedocs.io/en/stable/kernels.html

http://jupyter-client.readthedocs.io/en/stable/wrapperkernels.html

http://jupyter-client.readthedocs.io/en/stable/messaging.html

Thomas

[Roland Weber]

1. what is the role of kernels in Jupyter (how is the interaction with other components)

The general concept is...

Browser/Client ---\         /---Kernel

Browser/Client ----*Jupyter*----Kernel

Browser/Client ---/         \---Kernel

where "Jupyter" can be a notebook server or kernel gateway. As Thomas explained, the kernels execute code. The browser or other client decides what should be executed, and gets the results.

If you have a Jupyter Notebook server, Jupyter knows about notebooks. Jupyter loads and saves notebooks as instructed by the client, and starts and stops kernels. When a cell is executed, just the code of that cell is sent by the client to the kernel that was started for the notebook. Jupyter serves as a kind of router or bridge that translates websocket connections from the client into ZeroMQ connections to the kernel.

If you have a Jupyter Kernel Gateway server in websocket mode, there are neither notebooks nor code cells. Clients provide code snippets directly. Jupyter still starts and stops kernels, and translates websocket connections into ZeroMQ connections.

hope that helps,

  Roland

[john alexander sanabria ordonez]

Thanks for both answers, they give me a good starting point for studying/working kernels.

Regards,

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