Dynamically load available images on host using DockerSpawner.allowed_images

unvaare · July 21, 2022, 6:56pm

Hi Everyone!
I am new to jupyterhub and have been trying to figure out a way to dynamically load the available images on host in the image selection dropdown.
The reason i want to do this is whenever a new image for jupyterlab is available, the jupyterhub_config.py needs to be updated and then jupyterhub is restarted to load that image. I am looking for an elegant solution to fix that.
What i could think of was somehow loading the images on host and then re-run the jupyterhub_config.py file within contianer.

manics · July 22, 2022, 6:25pm

c.DockerSpawner.allowed_images can be a callable (e.g. a Python function) that returns the list of allowed images.
https://jupyterhub-dockerspawner.readthedocs.io/en/latest/api/index.html#id0

This is the source code for DockerSpawner in case you want to look at how allowed_images is used:

github.com

jupyterhub/dockerspawner/blob/aa8c1b073d1205fca29a3db007a73040b7871285/dockerspawner/dockerspawner.py

"""
A Spawner for JupyterHub that runs each user's server in a separate docker container
"""
import asyncio
import os
import string
import warnings
from concurrent.futures import ThreadPoolExecutor
from functools import partial
from io import BytesIO
from pprint import pformat
from tarfile import TarFile, TarInfo
from textwrap import dedent, indent
from urllib.parse import urlparse

import docker
from docker.errors import APIError
from docker.types import Mount
from docker.utils import kwargs_from_env
from escapism import escape

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Dynamically load available images on host using DockerSpawner.allowed_images

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