MySQL8遇到的问题记录

问题1：ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

问题描述：

[root@loaclhost ~]# mysql -u root ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO) [root@loaclhost ~]# mysql -u root  -p Enter password: ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

解决办法：

1、修改/etc/my.cnf，不使用密码登录

加上skip-grant-tables，保存

重启mysql ：systemctl restart mysqld

2、不用密码登录

3、ALTER USER 'root'@'%' IDENTIFIED BY '123456';

如果报：ERROR 1290 (HY000): The MySQL server is running with the --skip-grant-tables option so it cannot execute this statement

输入：flush privileges;

4、再次输入：ALTER USER 'root'@'%' IDENTIFIED BY '123456';

提示：ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

（此处参考后面的4、修改简单权限）

5、再次修改密码：ALTER USER 'root'@'%' IDENTIFIED BY '123456';

6、刷新权限
mysql> flush privileges;

7、退出mysql，清除my.cnf的skip-grant-tables后重启mysql
systemctl restart mysqld

最后，再次登录，输入密码可登录

 

 问题2：ERROR 1396 (HY000): Operation ALTER USER failed for 'root'@'%'

解决办法：

按照以下步骤执行： 进入mysql库 use mysql； 刷新权限 mysql> flush privileges; 清空密码 mysql> UPDATE user SET authentication_string="" WHERE user=“root”; 刷新权限 mysql> flush privileges; 设置root的新的密码 mysql>alter user’root’@’%’ IDENTIFIED BY 'test123 '; 刷新权限 mysql> flush privileges; 退出mysql，清除my.cnf的skip-grant-tables后重启mysql systemctl restart mysqld

问题3：ERROR 1227 (42000): Access denied; you need (at least one of) the SYSTEM_USER privilege(s) for this operation

解决办法：

#给root用户授权 grant system_user on *.* to 'root';