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

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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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