用root用户连接MySQL 数据库报"ERROR 1698 : Access denied for user ‘root’@‘localhost’" 错误。

**客户端：**terminal，Navicat，连接都该错误报错误.

**系统环境：**ubuntu 18,MySQL5.7

**原因：**The reason is that recent Ubuntu installation (maybe others also), mysql is using by default the UNIX auth_socket plugin.

Basically means that: db_users using it, will be “auth” by the system user credentias. You can see if your root user is set up like this by doing the following: $ sudo mysql -u root # I had to use “sudo” since is new installation

mysql> USE mysql;

mysql> SELECT User, Host, plugin FROM mysql.user;

±-----------------±----------------------+

| User | plugin |

±-----------------±----------------------+

| root | auth_socket |

| mysql.sys | mysql_native_password |

| debian-sys-maint | mysql_native_password

±-----------------±----------------------+

As you can see in the query, the root user is using the auth_socket plugin

There are 2 ways to solve this:

You can set the root user to use the mysql_native_password plugin

You can create a new db_user with you system_user (recommended)

Option 1: $ sudo mysql -u root # I had to use “sudo” since is new installation

mysql> USE mysql;

mysql> UPDATE user SET plugin=‘mysql_native_password’ WHERE User=‘root’;

mysql> FLUSH PRIVILEGES;

mysql> exit;

$ service mysql restart

Option 2: (replace YOUR_SYSTEM_USER with the username you have) $ sudo mysql -u root # I had to use “sudo” since is new installation

mysql> USE mysql;

mysql> CREATE USER ‘YOUR_SYSTEM_USER’@‘localhost’ IDENTIFIED BY ‘’;

mysql> GRANT ALL PRIVILEGES ON . TO ‘YOUR_SYSTEM_USER’@‘localhost’;

mysql> UPDATE user SET plugin=‘auth_socket’ WHERE User=‘YOUR_SYSTEM_USER’;

mysql> FLUSH PRIVILEGES;

mysql> exit;

$ service mysql restart

Remember that if you use option #2 you’ll have to connect to mysql as your system username (mysql -u YOUR_SYSTEM_USER)

Note: On some systems (e.g., Debian stretch) ‘auth_socket’ plugin is called ‘unix_socket’, so the corresponding SQL command should be: UPDATE user SET plugin=‘unix_socket’ WHERE User=‘YOUR_SYSTEM_USER’;