将/usr/local/opt/mysql/support-files/my-default.cnf复制为/etc/my.cnf或/etc/mysql/my.cnf，然后重启mysql。

Mac OS X Mavericks的当前MySQL包(在撰写本文时为MySQL -5.6.17-osx10.7-x86_64)在安装期间自动创建my.cnf。

它位于/usr/local/mysql-5.6.17-osx10.7-x86_64/my.cnf 根据您的版本调整路径。

将/usr/local/opt/mysql/support-files/my-default.cnf复制为/etc/my.cnf或/etc/mysql/my.cnf，然后重启mysql。

在mysql 5.6.22中，my.cnf的路径为

/usr/local/opt/mysql/my.cnf 

我在macOS High Sierra 10.13.3版本中使用mysql 5.7.17版本，我在这里找到了mysql配置文件。

cd /usr/local/mysql/support-files/my-default.cnf

In my case, the file did not exist. In MySQL Workbench I went to OPTIONS FILE and found some default values. I clicked apply. It asked for permission. It then created the my.cnf file under /etc. However, it is very important to keep in mind that the first time you click "apply", you do not make any changes to the default configuration. Once the file has been created, you can make changes which will be applied when you click "apply". Otherwise you will not be shown the apply button when you make changes.