[Mysql] root user login mysql, enter the password error: Access denied for user 'root' @ 'localhost' mysql appears ERROR1698 (28000): Access denied for user root @ localhost error Solution

 

Questions are as follows:

wangju@wangju-HP-348-G4:~$ mysql -u root -p
Enter password: 
ERROR 1698 (28000): Access denied for user 'root'@'localhost'

 The solution: two steps

• Mysql configuration can log on without a password
• Reconfigure mysql user name and password

 First of all: mysql configuration can log on without a password

step1:

Use find global search mysql configuration file

root@wangju-HP-348-G4:/home/wangju# find / -name mysqld.cnf
/etc/mysql/mysql.conf.d/mysqld.cnf

step2:

In mysql configuration file [mysqld] was added in the following sentence:

skip-grant-tables　　　　<-- add here

  Role: is to let you log into mysql password can not.

step3:

Save changes, restart mysql

service mysql restart

 step4:

Mysql input on a terminal -u root -p, met directly enter prompted to enter a password to enter mysql

Then: Reconfigure mysql username and password
 step1: 
Perform the following three sentences are configured root user password after entering mysql

use MySQL; then hit Enter to 

Update  the User  the SET authentication_string = password ( "your password") the WHERE  the User = "root"; then hit the Enter 

flush privileges ; then hit Enter

The results are as follows:

mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> update user set authentication_string=password("admin123456") where user="root";
Query OK, 1 row affected, 1 warning (0.02 sec)
Rows matched: 2  Changed: 1  Warnings: 1

mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)

Then enter quit, quit mysql. 

step2：

Mysqld.cnf to re-enter the beginning of the file to add the skip-grant-tables to comment out this statement.

  Back input terminal MySQL -u -p the root , given:

root@wangju-HP-348-G4:/home/wangju# mysql -u root -p
Enter password: 
ERROR 1524 (HY000): Plugin 'auth_socket' is not loaded

再把刚才注释掉的skip-external-locking取消注释,然后重启mysql

执行下面的命令:

use mysql;
#切换数据库

select user,plugin from user;
#查询user表 user列,plugin列的值
#从查询结果可以看出plugin root的字段是auth_socket，把它改为mysql_native_password

update user set authentication_string=password("admin123456"),plugin='mysql_native_password' where user='root';
#更新user表plugin root

执行结果:

mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select user,plugin from user;
+------------------+-----------------------+
| user             | plugin                |
+------------------+-----------------------+
| root             | auth_socket           |
| mysql.session    | mysql_native_password |
| mysql.sys        | mysql_native_password |
| debian-sys-maint | mysql_native_password |
| root             | mysql_native_password |
| tester           | mysql_native_password |
+------------------+-----------------------+
6 rows in set (0.00 sec)

mysql> update user set authentication_string=password("admin123456"),plugin='mysql_native_password' where user='root';
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 2  Changed: 1  Warnings: 1

 

再输入select user,plugin from user;回车，我们能看到root用户的字段改成功了。

mysql> select user,plugin from user;
+------------------+-----------------------+
| user             | plugin                |
+------------------+-----------------------+
| root             | mysql_native_password |
| mysql.session    | mysql_native_password |
| mysql.sys        | mysql_native_password |
| debian-sys-maint | mysql_native_password |
| root             | mysql_native_password |
| tester           | mysql_native_password |
+------------------+-----------------------+
6 rows in set (0.00 sec)

step3:

quit退出,再执行step3,重启mysql

 

结果:

再用mysql -u root -p,回车,输入密码之后,就可以登录成功了

 

参考文档:

mysql出现ERROR1698(28000):Access denied for user root@localhost错误解决方法