ERROR 1045 (28000): Access denied for user ‘root’@’localhost’ (using password:NO)

[root ~]# mysql -u root
ERROR 1045 (28000): Access denied for user ‘root’@’localhost’ (using password:NO)
Stop the service/daemon of mysql running
[root ~]# service mysql stop
mysql stop/waiting
Start mysql without any privileges using the following option; This option is used to boot up and do not use the privilege system of MySQL.
[root ~]# mysqld_safe –skip-grant-tables &
enter the mysql command prompt
[root ~]# mysql -u root
mysql>
Fix the permission setting of the root user ;
mysql> use mysql;
Database changed
mysql> select * from user;
Empty set (0.00 sec)
mysql> truncate table user;
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)
mysql> grant all privileges on *.* to root@localhost identified by ‘YourNewPassword’ with grant option;
Query OK, 0 rows affected (0.01 sec)
*if you don`t want any password or rather an empty password

mysql> grant all privileges on *.* to root@localhost identified by ” with grant option;
Query OK, 0 rows affected (0.01 sec)*
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
Confirm the results:

mysql> select host, user from user;
+———–+——+
| host | user |
+———–+——+
| localhost | root |
+———–+——+
1 row in set (0.00 sec)
Exit the shell and restart mysql in normal mode.
mysql> quit;
[root ~]# kill -KILL [PID of mysqld_safe]
[root ~]# kill -KILL [PID of mysqld]
[root ~]# service mysql start
Now you can successfully login as root user with the password you set
[root ~]# mysql -u root -pYourNewPassword
mysql>