Linux学习-MySQL8.0报错

Posted 2022-10-22 丢爸

给SQL用户授权时报错

mysql> grant all on *.* to root@'%';
ERROR 1410 (42000): You are not allowed to create a user with GRANT

####解决方法

#默认root用户不允许远程连接
mysql> select Host,User from user;
+------+------------------+
| Host         | User             |
+------+------------------+
| localhost    | mysql.infoschema |
| localhost    | mysql.session    |
| localhost    | mysql.sys        |
| localhost    | root             |
+------+------------------+
4 rows in set (0.00 sec)

#更新用户表中的Host为%即可(所有主机可登录 )
mysql> update user set host='%' where User='root';
Query OK, 4 rows affected (0.01 sec)
Rows matched: 4  Changed: 4  Warnings: 0

使用SQLyog连接MySQL8.0报错1

解决方法

#进入MySQL后，修改user表
mysql> alter user root@'%' identified with mysql_native_password by 'Lotus!1120';
Query OK, 0 rows affected (0.00 sec)

使用SQLyog连接MySQL报错2

解决方法

#关闭服务器上的防火墙
[root@localhost ~]# systemctl stop firewalld
[root@localhost ~]# systemctl disable firewalld

MySQL密码策略

#查看MySQL是否安装了mysql_native_password
mysql> select * from mysql.component;
+--------------+--------------------+------------------------------------+
| component_id | component_group_id | component_urn                      |
+--------------+--------------------+------------------------------------+
|            1 |                  1 | file://component_validate_password |
+--------------+--------------------+------------------------------------+
1 row in set (0.00 sec)
#查看密码设置策略，目前设置为MEDIUM，
mysql> show variables like 'validate_password%';
+--------------------------------------+--------+
| Variable_name                        | Value  |
+--------------------------------------+--------+
| validate_password.check_user_name(是否可以将密码设置成用户名)    | ON     |
| validate_password.dictionary_file(检查密码字典的文件路径)    |        |
| validate_password.length(最小长度)             | 8      |
| validate_password.mixed_case_count(如策略为中等或更强需要大小写字母)   | 1      |
| validate_password.number_count(密码包含的数字数量)       | 1      |
| validate_password.policy(密码等级(MEDIUM,STRONG,LOW,LOW/0只检查长度，MEDIUM/1检查长度，数字大小写，特殊字符，STRONG/2检查长度，数字，大小写，特殊字符，字典文件))             | MEDIUM |
| validate_password.special_char_count(特殊字符数量) | 1      |
+--------------------------------------+--------+
7 rows in set (0.00 sec)
#修改密码策略
#设置长度为6
mysql> set global validate_password.length=6;
Query OK, 0 rows affected (0.00 sec)
#将MySQL密码策略级别设置为LOW
mysql> set global validate_password.policy='LOW';
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
#修改简单密码
mysql> alter user root@'%' identified by '123456';
Query OK, 0 rows affected (0.01 sec)