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When the main arbiter crashes and restarts, orphaned dirty arbiters may continue running. This adds detection and cleanup: - Add well-known PID file location based on proc_name - Dirty arbiter writes PID on startup, removes on exit - Main arbiter checks for orphans on fresh start (not USR2) - Uses self.proc_name for USR2 compatibility (myapp vs myapp.2) During USR2 upgrade, old and new dirty arbiters coexist with separate PID files, preventing the old from removing the new's file.
Gunicorn
========
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:alt: PyPI version
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:alt: Supported Python versions
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Gunicorn 'Green Unicorn' is a Python WSGI HTTP Server for UNIX. It's a pre-fork
worker model ported from Ruby's Unicorn_ project. The Gunicorn server is broadly
compatible with various web frameworks, simply implemented, light on server
resource usage, and fairly speedy.
**New in v24**: Native ASGI support (beta) for async frameworks like FastAPI!
Quick Start
-----------
.. code-block:: bash
pip install gunicorn
gunicorn myapp:app --workers 4
For ASGI applications (FastAPI, Starlette):
.. code-block:: bash
gunicorn myapp:app --worker-class asgi
Features
--------
- WSGI support for Django, Flask, Pyramid, and any WSGI framework
- **ASGI support** (beta) for FastAPI, Starlette, Quart
- uWSGI binary protocol for nginx integration
- Multiple worker types: sync, gthread, gevent, eventlet, asgi
- Graceful worker process management
- Compatible with Python 3.12+
Documentation
-------------
Full documentation at https://gunicorn.org
- `Quickstart <https://gunicorn.org/quickstart/>`_
- `Configuration <https://gunicorn.org/configure/>`_
- `Deployment <https://gunicorn.org/deploy/>`_
- `Settings Reference <https://gunicorn.org/reference/settings/>`_
Community
---------
- Report bugs on `GitHub Issues <https://github.com/benoitc/gunicorn/issues>`_
- Chat in `#gunicorn`_ on `Libera.chat`_
- See `CONTRIBUTING.md <CONTRIBUTING.md>`_ for contribution guidelines
Sponsors
--------
Gunicorn is maintained thanks to our sponsors. `Become a sponsor <https://github.com/sponsors/benoitc>`_.
.. Sponsor logos will appear here
License
-------
Gunicorn is released under the MIT License. See the LICENSE_ file for details.
.. _Unicorn: https://bogomips.org/unicorn/
.. _`#gunicorn`: https://web.libera.chat/?channels=#gunicorn
.. _`Libera.chat`: https://libera.chat/
.. _LICENSE: https://github.com/benoitc/gunicorn/blob/master/LICENSE