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Jupyter kernel

It is based on the elyra/kernel-py image and replaces the original startup scripts with bootstrap-kernel.sh and launch_ipykernel.py from the directory to achieve the following functionality.

Startup Scripts

It's recommended to put some helper functions or configurations in the startup scripts. Place your startup scripts to ~/.ipython/profile_default/startup/ directory to take effect.

Note: The ~/.ipython directory must be writable for the process launching the kernel, otherwise there will be a warning message: UserWarning: IPython dir '/home/jovyan/.ipython' is not a writable location, using a temp directory. and the startup scripts won't take effects.

Official document at ~/.ipython/profile_default/startup/README:

This is the IPython startup directory

.py and .ipy files in this directory will be run prior to any code or files specified via the exec_lines or exec_files configurables whenever you load this profile.

Files will be run in lexicographical order, so you can control the execution order of files with a prefix, e.g.::

00-first.py
50-middle.py
99-last.ipy

Script Modifications

The current version only modifies the Python startup script.

The current script references Jupyter Kernel Image and has made the following modifications:

  • The kernel can be started using a user-specified port.
  • The PUBLIC_KEY is set as an optional parameter; however, it is required when the response address is provided.
  • Use the KERNEL_ID from the environment variables as the key to connect to the kernel.
  • Add the KERNEL_IDLE_TIMEOUT environment variable. Once set, any kernel that remains idle for longer than this duration will be terminated.