gunicorn not fully reloading after an HUP signal
Solution 1:
The problem is the --preload parameter.
The first solution is not to use the --preload.
The second solution is to follow this:
# Reload a new master with new workers
kill -s USR2 $PID
# Graceful stop old workers
kill -s WINCH $OLDPID
# Graceful stop old master
kill -s QUIT $OLDPID
The third solution is to use the package https://github.com/flupke/rainbow-saddle that works well with supervisord.