查看mysql服务配置文件的位置

which mysqld

/usr/sbin/mysqld --verbose --help | grep -A 1 'Default options'

Default options are read from the following files in the given order: /etc/my.cnf /etc/mysql/my.cnf /usr/etc/my.cnf ~/.my.cnf 

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默认配置选项会按一下文件的顺序读取：

/etc/my.cnf

/etc/mysql/my.cnf

/usr/etc/my.cnf

~/.my.cnf