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在mac 上使用 brew 安装 mysql 后，发现 /etc/my.cnf 并不存在。
于是使用命令查找 MySQL 的配置启动文件列表：
$ mysqld --help --verbose | less
...
Default options are read from the following files in the given order:
/etc/my.cnf /etc/mysql/my.cnf /usr/local/etc/my.cnf ~/.my.cnf
...
依次查找，发现文件：/usr/local/etc/my.cnf 存在！
即 通过 brew 安装的 MySQL 的配置文件为：/usr/local/etc/my.cnf
网上说的使用 ls $(brew --prefix mysql)/support-files/my-* 作为配置文件的，经查，目前我使用的版本是没有对应的文件的！！！
我的版本为：
$ brew info mysql
mysql: stable 5.7.21 (bottled), devel 8.0.4-rc
Open source relational database management system
https://dev.mysql.com/doc/refman/5.7/en/
Conflicts with:
mariadb (because mysql, mariadb, and percona install the same binaries.)
mariadb-connector-c (because both install plugins)
mysql-cluster (because mysql, mariadb, and percona install the same binaries.)
mysql-connector-c (because both install MySQL client libraries)
percona-server (because mysql, mariadb, and percona install the same binaries.)
/usr/local/Cellar/mysql/5.7.21 (323 files, 235.0MB) *
Poured from bottle on 2018-03-13 at 16:09:50
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/mysql.rb
