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mysql> show variables like '%general%';
+------------------+-----------------------------------+
| Variable_name    | Value                             |
+------------------+-----------------------------------+
| general_log      | OFF                               |
| general_log_file | /opt/mysql_data/server0/mysql.log |
+------------------+-----------------------------------+
2 rows in set (0.00 sec)

mysql> set general_log=ON;
ERROR 1229 (HY000): Variable 'general_log' is a GLOBAL variable and should be set with SET GLOBAL
mysql> set global general_log=ON;
Query OK, 0 rows affected (0.00 sec)

mysql> show variables like '%general%';
+------------------+-----------------------------------+
| Variable_name    | Value                             |
+------------------+-----------------------------------+
| general_log      | ON                                |
| general_log_file | /opt/mysql_data/server0/mysql.log |
+------------------+-----------------------------------+
2 rows in set (0.00 sec)

set global general_log=ON;