MySQL 8不再允许您使用GRANT命令创建用户。您需要首先创建用户。

CREATE USER 'root'@'%' IDENTIFIED BY 'PASSWORD';
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' WITH GRANT OPTION;
FLUSH PRIVILEGES;

关闭链接/etc/mysql/mysql.conf.d/mysqld.cnf或/etc/mysql/my.cnf的注释:

bind-address = 127.0.0.1  =>>  #bind-address = 127.0.0.1

修改主机名以便所有机器都可以访问它，在本地运行这个SQL命令:

UPDATE mysql.user SET Host='%' WHERE Host='localhost' AND User='root';
FLUSH PRIVILEGES;

重新启动服务:

sudo service mysql restart

打开mysql端口:

sudo ufw allow 3306

启用远程根访问可能是危险的。如果您要设置具有更严格权限的用户帐户，则更可取。以下三个步骤可以做到这一点。

Ensure that the line starting with bind-address ... is at least commented out in your my.ini or my.cnf file. If it doesn't exist, move on. You can find this file in C:\ProgramData\MySQL\MySQL Server 8.0 on Windows. Afterwards, check that the user account you are establishing the connection with does not have localhost in the Limit to Hosts Matching field. While it isn't recommended, you can instead put % in that field for testing purposes. You can do this by opening a local connection to the server with MySQL Workbench, then going to Server>Users and Privileges from the menu bar and finding the user account you want to connect with.

“限制主机匹配”字段是不允许您连接非本地。也就是说，它将接受的连接限制为一个IP地址模式。理想情况下，您应该从静态IP地址或子网访问MySQL服务器，这样您就可以尽可能地限制。

显然，您的防火墙应该允许MySQL服务器应用程序通过您想要的端口进行通信。您和服务器之间的物理网络设备应该允许在您想要连接的端口上进行通信。(通常端口为3306)

对于需要它的人，检查防火墙端口3306是否也打开了，如果您的防火墙服务正在运行。

在完成以上所有操作后，我仍然无法以根用户远程登录，但是telnet到3306端口确认MySQL正在接受连接。

我开始查看MySQL中的用户，并注意到有多个具有不同密码的根用户。

select user, host, password from mysql.user;

所以在MySQL中，我再次为root设置了所有密码，我最终可以以root身份远程登录。

use mysql;
update user set password=PASSWORD('NEWPASSWORD') where User='root';
flush privileges;

请按照下面提到的步骤来设置MySQL用户的通配符远程访问。

(1) Open cmd. (2) navigate to path C:\Program Files\MySQL\MySQL Server 5.X\bin and run this command. mysql -u root -p (3) Enter the root password. (4) Execute the following command to provide the permission. GRANT ALL PRIVILEGES ON *.* TO 'USERNAME'@'IP' IDENTIFIED BY 'PASSWORD'; USERNAME: Username you wish to connect to MySQL server. IP: Public IP address from where you wish to allow access to MySQL server. PASSWORD: Password of the username used. IP can be replaced with % to allow user to connect from any IP address. (5) Flush the previleges by following command and exit. FLUSH PRIVILEGES; exit; or \q