默认情况下没有my.cnf。因此，MysqL从所有默认设置开始。如果要创建自己的my.cnf来覆盖所有默认值，请将其放在/etc/my.cnf中。
另外，您可以运行MysqL --help并在其中查找列出的conf位置。
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
The following groups are read: MysqL client
The following options may be given as the first argument:
--print-defaults Print the program argument list and exit.
--no-defaults Don't read default options from any option file.
--defaults-file=# Only read default options from the given file #.
--defaults-extra-file=# Read this file after the global files are read.
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