JupyterHub Apps Launcher

JupyterHub Apps Launcher is a generalized server launcher. The goal of this project is to support launching anything like say a Flask Server, FastAPI server or a Panel Dashboard via a user supplied command. Currently, the following frameworks are supported:

• Panel
• Bokeh
• Streamlit
• Plotly Dash
• Voila
• Gradio
• JupyterLab
• Generic Python Command

Installation

uv pip install jhub-apps

or via conda

conda install -c conda-forge jhub-apps

Development Installation

Install Dependencies

uv sync --extra dev

To develop the React UI frontend, also run:

cd ui
npm install
cd -

K3d Development Environment

For testing JupyterHub Apps with Kubernetes spawners (e.g., KubeSpawner), you can use the k3d development environment which provides a local Kubernetes cluster with Tilt for rapid development.

Prerequisites:

• Install k3d
• Tilt
• Helm
• kubectl

cd k3s-dev
make up

Once started, access JupyterHub at http://localhost:8000 (login with any username and password password)

To tear down the environment:

make down

Starting JupyterHub

Set the following environment variable:

export JHUB_APP_JWT_SECRET_KEY=$(openssl rand -hex 32)

Start JupyterHub:

jupyterhub -f jupyterhub_config.py

Now go to http://127.0.0.1:8000/hub/home to access JHub Apps Launcher

API Endpoints

The Hub service is exposed via FastAPI endpoints. The documentation for the same can be accessed at: http://127.0.0.1:10202/services/japps/docs

To try out authenticated endpoints click on the Authorize button on the top right of the above url and choose OAuth2AuthorizationCodeBearer and click on Authorize.

Developing Locally

Note: In order to develop locally, both the JupyterHub backend and React UI frontend should be running.

1. To start the JupyterHub Backend, run the following in a terminal:

jupyterhub -f jupyterhub_config.py

2. To start the React UI frontend, run the following in a separate terminal from the ui directory:

npm run watch

Running Tests

Unit Tests

pytest jhub_apps/tests

E2E Tests

pytest jhub_apps/tests/tests_e2e -vvv -s --headed

Usage

JHub Apps has been tested with local JupyterHub using SimpleLocalProcessSpawner and with The Littlest JupyterHub using SystemdSpawner.

• Install JHub Apps

uv pip install git+https://github.com/nebari-dev/jhub-apps.git

• Add the following in The Littlest JupyterHub's jupyterhub_config.py

from tljh.user_creating_spawner import UserCreatingSpawner
from jhub_apps.configuration import install_jhub_apps

c.JupyterHub.bind_url = "<YOUR_JUPYTERHUB_URL>"
c.SystemdSpawner.unit_name_template = 'jupyter-{USERNAME}{JHUBSERVERNAME}'
c.JAppsConfig.apps_auth_type = "oauth" # or none (if you don't want authentication on apps)
c.JAppsConfig.python_exec = "python3"
# Pass in the path to jupyterhub config
c.JAppsConfig.jupyterhub_config_path = "jupyterhub_config.py"
# Either a static list of conda environments to show in the
# create panel apps form or a callable to fetch conda enviornments
# dynamically, e.g. from conda-store API
c.JAppsConfig.conda_envs = []
c = install_jhub_apps(c, UserCreatingSpawner)

Acknowledgments

This project is heavily inspired by and uses code from @danlester's cdsdashboards, without his work building this would have been a whole lot harder.