Flask Component for Diploi

Operation

Getting started

1. In the Dashboard, click Create Project +
2. Under Pick Components, choose Flask. Here you can also add a frontend framework to create a monorepo app, eg, Flask for backend and React+Vite for frontend
3. In Pick Add-ons, you can add one or multiple databases to your app
4. Choose Create Repository to generate a new GitHub repo
5. Finally, click Launch Stack

Full guide at https://diploi.com/blog/hosting_flask_apps

Development

During development, the container installs Node.js and nodemon to enable automatic reloads when files change. The development server is started with:

nodemon --delay 1 --watch "pyproject.toml" --watch ".venv/lib/*" --watch ".venv/lib64/*" --watch "src"  --ext "py" --exec "uv run --isolated flask --app src/main.py run --host=0.0.0.0 --port=8000 --no-reload --debug"

This will:

• Activate the virtual environment in .venv
• This runs the Flask app defined in main.py using the uv tool in an isolated environment, making the app available on all network interfaces at port 8000, with debug mode enabled.

Production

Builds a production-ready image. During the build, dependencies are installed with uv sync. When the container starts, it runs:

uv run --frozen gunicorn -w 4 -b 0.0.0.0:8000 src.main:app

This uses the Gunicorn to serve your application on port 8000.

Links

• Flask documentation
• Python documentation
• uv documentation