MySQL 出现 Access denied for user 'root'@'localhost' (using password: YES) 错误

登录某台服务器的mysql时候总报错：

mysql2/client.rb:58:in `connect': Access denied for user 'root'@'localhost' (using password: YES) (Mysql2::Error)



解决方法：

# /etc/init.d/mysqld stop
# mysqld_safe --user=mysql --skip-grant-tables --skip-networking &
# mysql -u root mysql
mysql> UPDATE user SET Password=PASSWORD(’newpassword’) where USER=’root’;
mysql> FLUSH PRIVILEGES;
mysql> quit
# /etc/init.d/mysqld restart
# mysql -uroot -p
Enter password: <输入新设的密码newpassword>
mysql>