1. Check which supervisor process is running with which configuration
ps -ef | grep supervisord
2. Should get following output in terminal
root 2204 1 0 22:57 ? 00:00:00 /usr/bin/python /usr/bin/supervisord -c supervisor.conf
ubuntu 2791 1394 0 23:10 pts/0 00:00:00 grep --color=auto supervisord
3. Kill with process ID
kill -s SIGTERM 2204
4. Start supervisor
sudo supervisord -c supervisor.conf