On your mysql console…

mysql> SHOW VARIABLES LIKE "general_log%";

+------------------+----------------------------+
| Variable_name    | Value                      |
+------------------+----------------------------+
| general_log      | OFF                        |
| general_log_file | /var/run/mysqld/mysqld.log |
+------------------+----------------------------+

mysql> SET GLOBAL general_log = 'ON';

Then!

tail -f -n200 /var/run/mysqld/mysqld.log

After debugging… don’t forget to turn it OFF!

mysql> SET GLOBAL general_log = 'OFF';