查看命令
mysqld --verbose --help|grep "Default options" -n1
输出结果
11-
12:Default options are read from the following files in the given order:
13-/etc/my.cnf /etc/mysql/my.cnf /home/uar/local/mysql/etc/my.cnf ~/.my.cnf
原文：http://www.cnblogs.com/osroot/p/5627881.html