#gunicorn

DevOps & CI/CD Bug Report

docker run arguments replaced the whole command: CMD vs ENTRYPOINT override rules

John Nguyen · Aug 5, 2026 · 8 min read

Passing --workers 4 to docker run crashed the container with exec: "--workers": executable file not found. Arguments after the image name replace CMD entirely; they do not append. We explain the override rules in Docker, Compose and Kubernetes and the image layout that makes extra flags safe.

Performance & Scaling Bug Report

huggingface/tokenizers: the current process just got forked warning in Gunicorn

Ryan Pham · Nov 14, 2024 · 6 min read

Our embedding API logged a tokenizers fork warning thousands of times a day and tokenisation got slower after we enabled Gunicorn preload. The tokenizer was used in the master process before workers forked. Loading it after fork fixed both.

Programming Languages Bug Report

Python mutable default argument leaked checkout warnings between customers

Daniel Tran · Oct 29, 2024 · 9 min read

Customers started seeing checkout warnings that belonged to other people's orders. The cause was a list used as a default argument, created once per worker process and appended to on every request. Here is how we traced it and made it impossible to reintroduce.