想修改配置文件后重启mysql，没想到只关闭服务的话竟然不能关闭数据库，
[root@msyqlzhu data]# service mysqld stop
Stopping mysqld: [ OK ]
[root@msyqlzhu data]# ps -ef|grep mysql
root 4200 2118 0 07:32 pts/0 00:00:00 /bin/sh /usr/local/mysql/bin/mysqld_safe --defaults-file=/etc/my.cnf
mysql 4628 4200 0 07:32 pts/0 00:00:02 /usr/local/mysql/bin/mysqld --defaults-file=/etc/my.cnf --basedir=/usr/local/mysql --datadir=/mysqldata/mysql/data --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql --log-error=error.log --pid-file=msyqlzhu.pid --socket=/mysqldata/mysql/data/mysql.sock --port=3306

[root@msyqlzhu data]# /etc/init.d/mysqld stop
Stopping mysqld: [ OK ]
[root@msyqlzhu data]# ps -ef|grep mysql
root 4200 2118 0 07:32 pts/0 00:00:00 /bin/sh /usr/local/mysql/bin/mysqld_safe --defaults-file=/etc/my.cnf
mysql 4628 4200 0 07:32 pts/0 00:00:02 /usr/local/mysql/bin/mysqld --defaults-file=/etc/my.cnf --basedir=/usr/local/mysql --datadir=/mysqldata/mysql/data --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql --log-error=error.log --pid-file=msyqlzhu.pid --socket=/mysqldata/mysql/data/mysql.sock --port=3306
root 4793 2118 0 07:40 pts/0 00:00:00 grep mysql

也尝试过用mysqladmin去关闭数据库也不行。
最后需要在数据库中执行shutdown才行