Gunicorn reload with HUP stops main logging
Author: AndyDiraCreated Jun 6, 2025Updated Jun 19, 2025
Running Gunicorn 23.0. Startup line like
gunicorn my_app:app -c gunicorn.conf.py -p $PIDFILE --error-logfile $LOGDIR/$(date +%Y%m%d-%s).logIn the log file after sending -HUP signal.
[2025-06-06 10:40:53 +0300] [941791] [INFO] Starting gunicorn 23.0.0
[2025-06-06 10:40:53 +0300] [941791] [INFO] Listening at: http://0.0.0.0:1234 (941791)
[2025-06-06 10:40:53 +0300] [941791] [INFO] Using worker: src.my_app.MyUvicornWorker
[2025-06-06 10:40:53 +0300] [941801] [INFO] Booting worker with pid: 941801
[2025-06-06 10:40:53 +0300] [941801] [INFO] Started server process [941801]
[2025-06-06 10:40:53 +0300] [941801] [INFO] Waiting for application startup.
[2025-06-06 10:40:53 +0300] [941801] [INFO] Application startup complete.
[2025-06-06 10:40:53 +0300] [941804] [INFO] Booting worker with pid: 941804
[2025-06-06 10:40:53 +0300] [941805] [INFO] Booting worker with pid: 941805
[2025-06-06 10:40:53 +0300] [941804] [INFO] Started server process [941804]
[2025-06-06 10:40:53 +0300] [941804] [INFO] Waiting for application startup.
[2025-06-06 10:40:53 +0300] [941804] [INFO] Application startup complete.
[2025-06-06 10:40:53 +0300] [941805] [INFO] Started server process [941805]
[2025-06-06 10:40:53 +0300] [941805] [INFO] Waiting for application startup.
[2025-06-06 10:40:53 +0300] [941805] [INFO] Application startup complete.
[2025-06-06 10:41:32 +0300] [941791] [INFO] Handling signal: hup
[2025-06-06 10:41:32 +0300] [941791] [INFO] Hang up: Master
[2025-06-06 10:41:32 +0300] [941804] [INFO] Shutting down
[2025-06-06 10:41:32 +0300] [941804] [INFO] Error while closing socket [Errno 9] Bad file descriptor
[2025-06-06 10:41:32 +0300] [941801] [INFO] Shutting down
[2025-06-06 10:41:32 +0300] [941801] [INFO] Error while closing socket [Errno 9] Bad file descriptor
[2025-06-06 10:41:32 +0300] [941805] [INFO] Shutting down
[2025-06-06 10:41:32 +0300] [941805] [INFO] Error while closing socket [Errno 9] Bad file descriptor
[2025-06-06 10:41:32 +0300] [941804] [INFO] Waiting for application shutdown.
[2025-06-06 10:41:32 +0300] [941804] [INFO] Application shutdown complete.
[2025-06-06 10:41:32 +0300] [941804] [INFO] Finished server process [941804]
[2025-06-06 10:41:32 +0300] [941801] [INFO] Waiting for application shutdown.
[2025-06-06 10:41:32 +0300] [941801] [INFO] Application shutdown complete.
[2025-06-06 10:41:32 +0300] [941801] [INFO] Finished server process [941801]
[2025-06-06 10:41:32 +0300] [941805] [INFO] Waiting for application shutdown.
[2025-06-06 10:41:32 +0300] [941805] [INFO] Application shutdown complete.
[2025-06-06 10:41:32 +0300] [941805] [INFO] Finished server process [941805]
After reload Gunicorn continues to work properly, master PID 941791 retained and received new PIDs for server processes.
Problem - no lines with
[2025-06-06 10:41:53 +0300] [New PID] [INFO] Started server process [New PID]
[2025-06-06 10:41:53 +0300] [New PID] [INFO] Waiting for application startup.
[2025-06-06 10:41:53 +0300] [New PID] [INFO] Application startup complete.appear in the log after HUP signal was processed. No messages from new workers; they exist in OS.
Expected result - after reload with HUP messages from Gunicorn workers continue to be logged in main Gunicorn Log.
Source: benoitc/gunicorn