Percona-server-5.6.41 and sql_mode

Question

When setting

sql_mode=""

in /etc/mysql/my.cnf server leaves this variable in it default value:

mysql> show variables like 'sql_mode';

+-------------------+------------------------------------------------------------------------+ 
| Variable_name | Value                                                                                 |
+-------------------+------------------------------------------------------------------------+ 
| sql_mode         | STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION  |
+-------------------+------------------------------------------------------------------------+

However, if i set it manually in mysql shell:

set global sql_mode="";

server sets it as desired - to empty value. Till next server restart, when server sets this variable to default value again.

Tried in single and double quotes - no matter. No errors in error log. No other default configuration files of mysql loaded What's wrong?

Why?

Answer 1

Found: another MySQL config is /usr/my.cnf and it contains:

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

so, setting sql_mode="" did the thing I need.

Debian stretch. Percona server was installed after removing installed MySQL-5.6 community.

Intrecting thing: log doesn't mention this config for reading during server's startup...