访问被拒绝用户'root'@'localhost'（使用密码：NO） - 出了什么问题？

Question

(Sorry for my English)

This is a log of my console:

anton@anton-X451CA:~$ mysql -u root
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
anton@anton-X451CA:~$ mysql -u root -p
Enter password: 
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

What should I do? I understand that it appears when I try entering without a password, but I am dont confirmed password, and 'root'/empty string doesn't help.

Answer 1

I solved the problem, when:

Change the file my.cnf (in my Ubuntu-system he is placed at /etc/mysql/my.cnf). In the end i added that code:

[mysqld]
skip-grant-tables

That's helps enter in condole as anyone user without pass. Restart the server: sudo service mysql restart

Enter in the mysql-console:

mysql -u root

Change the password for user root:

UPDATE mysql.user SET authentication_string=PASSWORD('root'), plugin='mysql_native_password' WHERE User='root' AND Host='localhost';FLUSH PRIVILEGES;

exit the console:

\q

Remove (or use commentary) for that in my.cnf (we dont need that settings now):

#[mysqld]
#skip-grant-tables

restart mysql-server:

sudo service mysql restart

That's all. :)

Answer 2

When you installed this fresh, you usually execute

mysql_secure_installation

afterwards. There you also set the initial password for your root account (note, that this is not the root account you have in Linux).

When you installed version 5.7. or higher the initial password is not blank anymore. You can find it in the error log. Find this log by looking in your my.cnf file. Default directory is /var/log/mysql , I think.