MySQL ERROR 1698 (28000) 错误

MySQL ERROR 1698 (28000) 错误

最近尝试安装最新版的MySQL 5.7.10，结果出现了

ERROR 1698 (28000)

，如下。

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

首先停止mysql服务。

~$ sudo service mysql stop

以安全模式启动MySQL。

~$ sudo mysqld_safe --skip-grant-tables &

MySQL启动之后就可以不用密码登陆了。

~$ mysql -u root
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.10 MySQL Community Server (GPL)

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> SELECT user,host,plugin FROM mysql.user;
+-----------+-----------+-----------------------+
| user      | host      | plugin                |
+-----------+-----------+-----------------------+
| root      | localhost | auth_socket           |
| mysql.sys | localhost | mysql_native_password |
+-----------+-----------+-----------------------+
2 rows in set (0.00 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('Avalon'), plugin='mysql_native_password' WHERE user='root';
Query OK, 1 row affected, 1 warning (0.01 sec)

mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.01 sec)

重启服务，问题就解决了。

~$ sudo service mysql stop
[sudo] password for excalibur:
...
* MySQL Community Server 5.7.10 is stopped

~$ sudo service mysql start
..
* MySQL Community Server 5.7.10 is started

~$ mysql -u root -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.10 MySQL Community Server (GPL)

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