解决MySql ERROR 1698 (28000) 错误:Access denied for user 'root'@'localhost'

今天尝试在Ubuntu虚拟机上安装MySql 数据库(版本是:5.7.23-0Ubuntu0.18.04.1),数据库安装很简单,就是三行命令:

  1.   sudo apt-get install mysql-server # 下载安装mysql的服务端
  2.   sudo apt-get install mysql-client # 下载安装mysql的客户端
  3.   sudo apt-get install libmysqlclient-dev

但是,看似很顺利简单的安装过程,在第一次登陆的时候却遇到了麻烦。

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

然后,在网上找了很多的教程,最后实验成功的是这个方案:

解决步骤:

(1) 停止mysql服务:

~$ sudo service mysql stop

(2)以安全模式启动MySQL:

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

(3)MySQL启动之后就可以不用密码登陆了:

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

(4)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。

  1.   mysql> select user, plugin from mysql.user;
  2.   +-----------+-----------------------+
  3.   | user | plugin |
  4.   +-----------+-----------------------+
  5.   | root | auth_socket |
  6.   | mysql.sys | mysql_native_password |
  7.   | dev | mysql_native_password |
  8.   +-----------+-----------------------+
  9.   3 rows in set (0.01 sec)

(5)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。

  1.   mysql> update mysql.user set authentication_string=PASSWORD('newPwd'), plugin='mysql_native_password' where user='root';
  2.   Query OK, 1 row affected, 1 warning (0.00 sec)
  3.   Rows matched: 1 Changed: 1 Warnings: 1
  4.    
  5.   mysql> flush privileges;
  6.   Query OK, 0 rows affected (0.00 sec)

(6)重启服务,问题就解决了:

  1.   ~$ sudo service mysql stop
  2.   ...
  3.   * MySQL Community Server 5.7.10 is stopped
  4.   ~$ sudo service mysql start
  5.   ..
  6.   * MySQL Community Server 5.7.10 is started
  7.   ~$ mysql -u root -p
  8.   Enter password:
  9.   Welcome to the MySQL monitor. Commands end with ; or \g.
  10.   Your MySQL connection id is 2
  11.   Server version: 5.7.10 MySQL Community Server (GPL)

 

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