关闭MYSQL服务
service mysqld stop
启动mysqld_safe ,跳过启动授权表。
mysqld_safe --skip-grant-tables &
登录mysql,并修改密码
mysql
use mysql
update user set password=PASSWORD('12345678') where user="root"; ---将root密码设置为12345678
flush privileges;
exit
关掉mysqld_safe进程
kill -9 11283 (11283为mysqld_safe进程)
service mysqld start
mysql -uroot -p (输入密码12345678即可)