my.cnfを無視してしまう

Warning: World-writable config file '/opt/local/etc/mysql56/my.cnf' is ignored

mysql56/my.cnf のpermissionを変更します。

% sudo chmod 660 /opt/local/etc/mysql56/my.cnf
% mysql
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 570
Server version: 5.6.24 Source distribution

Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

無事、正常にコネクションが通りました。