通常，在Unix和类Unix系统上，MySQL/MariaDB程序在以下位置读取配置/启动文件(按指定顺序):

/etc/my.cnf - Global /etc/mysql/my.cnf - Global SYSCONFDIR/my.cnf - Global SYSCONFDIR represents the directory specified with the SYSCONFDIR option to CMake when MySQL was built. By default, this is the etc directory located under the compiled-in installation directory. $MYSQL_HOME/my.cnf - Server-specific (server only) MYSQL_HOME is an environment variable containing the path to the directory in which the server-specific my.cnf file resides. If MYSQL_HOME is not set and you start the server using the mysqld_safe program, mysqld_safe sets it to BASEDIR, the MySQL base installation directory. file specified with --defaults-extra-file=path if any ~/.my.cnf - User-specific ~/.mylogin.cnf - User-specific (clients only)

来源:使用选项文件。

注意:在Unix平台上，MySQL忽略全局可写的配置文件。这是有意为之的安全措施。

此外，在Mac上有一个简单的方法来检查它。

执行命令sudo fs_usage | grep my.cnf 这将实时报告与该文件相关的任何文件系统活动。 在另一个终端，重新启动MySQL/MariaDB，例如: 重启mysql 或者: Brew服务重新启动mariadb 在终端上使用fs_usage，应该显示正确的位置，例如。 15:52:22 access /usr/local/Cellar/mariadb/10.1.14/my.cnf 0.000002 sh 因此，如果该文件不存在，就创建一个。

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 

如果在Mac M1和MacOS Monterey 12.0.1中使用Homebrew安装MySQL，则位置为/opt/ Homebrew /etc/my.cnf

在Mac OS X Maverick的情况下，当MySQL通过Homebrew安装时，它位于/usr/local/opt/mysql/my.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.