Woke up to monitoring alerts and this lovely page on every URL:
It's Apache proxying to Gunicorn, and it seems to happen whenever someone uploads a big file. The error log mentions the upstream a lot but I'm not sure if that's the cause or just a symptom. I want to fix this properly instead of adding a cron job that restarts services every hour. Where do I start? I'll happily post whatever logs would help narrow this down.
ahh right error log shows the proxy getting connection refused from the Gunicorn upstream every time, whenever someone uploads a big file.
Check the app service right after a 502: systemctl status php*-fpm, systemctl status yourapp, or docker compose ps. If it shows restarts or exited state, read its own logs with journalctl -u yourapp -n 200 or docker compose logs app. The real error lives there, not in the proxy log. good luck man!
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