MySQL enable logging

Turn on general_log journal
mysql> set global general_log=on; -- Open log
Query OK, 0 rows affected (2.60 sec)

mysql> show variables like 'general_log';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| general_log   | ON    |
+---------------+-------+
1 row in set (0.00 sec)

mysql> set global general_log_file='/opt/sudytech/mysql/data/general.log'; -- Specify the log generation location
Query OK, 0 rows affected (0.05 sec)

mysql> show variables like 'general_log_file';
+------------------+--------------------------------------+
| Variable_name    | Value                                |
+------------------+--------------------------------------+
| general_log_file | /opt/sudytech/mysql/data/general.log |
+------------------+--------------------------------------+
1 row in set (0.04 sec)

because log_output The default value is FILE. So there's no need to modify .

see /opt/sudytech/mysql/data/ The directory has produced general.log journal

[[email protected] data]# pwd
/opt/sudytech/mysql/data
[[email protected] data]# tail -f general.log 
2021-05-18T06:45:32.140829Z         2 Query     set global general_log=OFF
/opt/sudytech/mysql/bin/mysqld, Version: 5.7.32-log (MySQL Community Server (GPL)). started with:
Tcp port: 3306  Unix socket: /tmp/mysql.sock
Time                 Id Command    Argument
2021-05-18T10:43:17.049473Z         3 Query     show variables like 'general_log'
2021-05-18T10:44:09.060990Z         3 Query     set global general_log_file='/opt/sudytech/mysql/data/general.log'
/opt/sudytech/mysql/bin/mysqld, Version: 5.7.32-log (MySQL Community Server (GPL)). started with:
Tcp port: 3306  Unix socket: /tmp/mysql.sock
Time                 Id Command    Argument
2021-05-18T10:44:18.375549Z         3 Query     show variables like 'general_log_file'
......

Permanent changes need to be made in my.cnf in [mysqld] add to
general_log = 1
general_log_file=/opt/sudytech/mysql/data/general.log