mysql，5.7：ERROR 1698 (28000): Access denied for user 'root'@'localhost'

一，问题描述：

MysqlERROR1698(28000)解决，新装了mysql-server-5.7,登录为这一问题，普通用户不能进mysql,只有root用户才能进，并且不需要任何密码。

~$ mysql -u root -p
Enter password:
ERROR 1698 (28000): Access denied for user ‘root’@’localhost’

二，解决步骤：

查看一下user表，错误的起因就是在这里， root的plugin被修改成了auth_socket，用密码登陆的plugin应该是mysql_native_password。

mysql> selectuser, plugin frommysql.user;
+-----------+-----------------------+
| user  | plugin        |
+-----------+-----------------------+
| root   | auth_socket      |
| mysql.sys | mysql_native_password |
| dev    | mysql_native_password |
+-----------+-----------------------+
<strong>3</strong> rows in set (<strong>0.01</strong> sec)

关于auth_socket，在官方有说明： https://dev.mysql.com/doc/mysql-security-excerpt/5.5/en/socket-authentication-plugin.html ，反正现在暂时不用它， 那就把这里改了。

mysql> update mysql.user set authentication_string=PASSWORD('newPwd'), plugin='mysql_native_password' where user='root';
Query OK, <strong>1</strong> row affected, <strong>1</strong> warning (<strong>0.00</strong> sec)
Rows matched: <strong>1</strong> Changed: <strong>1</strong> Warnings: <strong>1</strong>

mysql> flush privileges;
Query OK, <strong>0</strong> rows affected (<strong>0.00</strong> sec)

重启服务，问题就解决了

sudo service mysql restart