mysql 8 設置允許遠程連接 You are not allowed to create a user with GRANT

1.登錄mysql :   mysql -u root -p

2.輸入密碼：    Enter password:  xxxxx

       ------ Server version: 8.0.15 MySQL Community Server - GPL

3.進入mysql數據庫：use mysql;

4.設置允許遠程用戶訪問：   

MySQL [mysql]> GRANT ALL ON *.* TO 'root'@'%'

出現問題：ERROR 1410 (42000): You are not allowed to create a user with GRANT

原因：當前user表中沒有root - %記錄； 可以更新root - localhost 為 root - %

   

 

MySQL [mysql]> update user set host = '%' where user = 'root';
出現問題：ERROR 1062 (23000): Duplicate entry '%-root' for key 'PRIMARY'

原因顯示：host+user 應該是聯合主鍵，沖突了

5.解決方法：

MySQL [mysql]> update user set host = '%' where user = 'root' and host='localhost';

 

 

6.再次給用戶root授權

MySQL [mysql]> GRANT ALL ON *.* TO 'root'@'%' 

MySQL [mysql]> flush privileges;    

 

 

此時用navicat連接還是報錯：Client does not support authentication protocol requested by server; 

原因是mysql8默認的加密方式為caching_sha2_password 與mysql5的加密方式mysql_native_password 不同

7.解決方法-更新用戶加密方式：

MySQL [mysql]> ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '密碼';

查詢一下修改結果：MySQL [mysql]> select host,user,plugin from user;

 

 

其它：如果需要支持 root - localhost可以使用插入語句

 MySQL [mysql]> insert user (user, host, ssl_cipher, x509_issuer, x509_subject) values('root', 'localhost', '', '', '');

再查看：（注意 ssl_cipher, x509_issuer, x509_subject這幾個字段沒有默認值，不設置會提示錯誤）