使用mysqld_multi start 启动了多个mysql实例，但是mysqld_multi stop 却不能停止，为啥呢？因为你还没有授权呢。
/usr/local/mysql/bin/mysqld_multi stop
但是默认是停不掉的，需要我们做一个授权
grant shutdown on *.* to 'username'@'localhost' identified by 'password'
另外还需要在my.cnf配置文件中加上：
[mysqld_multi]
mysqld = /usr/local/mysql/bin/mysqld_safe
mysqladmin = /usr/local/mysql/bin/mysqladmin
user = username
password = password
/usr/local/mysql/bin/mysqld_multi stop
但是默认是停不掉的，需要我们做一个授权
grant shutdown on *.* to 'username'@'localhost' identified by 'password'
另外还需要在my.cnf配置文件中加上：
[mysqld_multi]
mysqld = /usr/local/mysql/bin/mysqld_safe
mysqladmin = /usr/local/mysql/bin/mysqladmin
user = username
password = password
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