killall -TERM mysqld     --------------命令来杀死正在运行的mysql

/usr/bin/mysql_safe --skip-grant-tables    ------------- 启动mysql

mysql    -------------------------------------------------登陆mysql

mysql> UPDATE user SET Password=PASSWORD('toor') where USER='root';

----------------------------------------设置mysql的root用户密码toor

/etc/init.d/mysqld restart   ----------------------------重启mysql

mysql -u root -p      ----------------------------------root登陆mysql