How to prevent overriding of configs in my.cnf by variables?
Posted by: Ilya Khanataev
Date: June 07, 2016 04:36AM


Since the upgrade from v5.5 to v5.6 some days ago I cannot monitor the logs anymore. The settings in the my.cnf (general_log_file = /var/log/mysql/mysql.log and general_log = 1) are ignored or better to say seem to get overriden by the variables:

mysql> SHOW VARIABLES LIKE '%general%';
| Variable_name | Value |
| general_log | OFF |
| general_log_file | /var/lib/mysql/ubuntuvm.log |

Sure, I can set the variables to other values:

SET GLOBAL general_log = 'ON';
SET GLOBAL general_log_file = '/var/log/mysql/test.log';

but it works only for the current session.

What are these variables for, if the configs can/should be defined in the my.cnf? How to prevent overriding of configs the my.cnf configs, in order to keep all settings at one place (in the my.cnf)?

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