查看MySQL初始密码、解决MySQL5.7修改密码以及密码认证失败（Your password does not satisfy the current policy requirements）

这几天在遇到Mysql时遇到密码忘记问题和修改密码不成功，为此解决思路如下；

1.安装MySQL时的初始密码，忘记MySQL的初始密码时，可以查看MySQL的初始密码；
2.修改密码时一直显示不成功，这时候应该查看参数；

1.安装MySQL时的初始密码，忘记MySQL的初始密码时，可以查看MySQL的初始密码；

（1）可以查看到初始root登陆密码

[root@localhost ~]# tmp_pwd=`awk '/temporary password/ {print $NF}' /var/log/mysqld.log`
[root@localhost ~]# echo $tmp_pwd
a&ek+Md)z17p

（2）MySQL的登陆：

[root@localhost ~]# mysql -uroot -pa&ek+Md)z17p

（3）可以通过查看MySQL的初始密码和修改过的密码

[root@localhost ~]# grep password /var/log/mysqld.log
2022-03-26T15:42:40.045397Z 1 [Note] A temporary password is generated for root@localhost: a&ek+Md)z17p
2022-03-26T15:43:32.512355Z 2 [Note] Unknown database 'password'
2022-03-26T15:43:42.436435Z 3 [Note] Unknown database 'password'
2022-03-26T15:44:52.617375Z 5 [Note] Unknown database 'password'
2022-03-26T15:45:06.915842Z 6 [Note] Unknown database 'password'
2022-03-26T15:45:46.370385Z 7 [Note] Unknown database 'passwordMySQL@123'
2022-03-26T15:45:59.527413Z 8 [Note] Access denied for user 'root'@'localhost' (using password: YES)

2.修改密码时一直显示不成功，这时候应该查看参数；

（1）此处修改密码一直报错

[root@localhost ~]# mysqladmin -uroot -p'MySQL@123' password
mysqladmin: [Warning] Using a password on the command line interface can be insecure.
New password:
Confirm new password:
Warning: Since password will be sent to server in plain text, use ssl connection to ensure password safety.
mysqladmin: unable to change password; error: 'Your password does not satisfy the current policy requirements'

（2）进入MySQL数据库修改密码也一直报错不成功时

[root@localhost ~]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 28
Server version: 5.7.37 MySQL Community Server (GPL)Copyright (c) 2000, 2022, Oracle and/or its affiliates.Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql> ALTER USER root@localhost identified by '123456';
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
mysql> set password for root@localhost = password('mysql@123');
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

（3）查看MySQL的密码设置参数

mysql> SHOW VARIABLES LIKE 'validate_password%';
+--------------------------------------+--------+
| Variable_name                        | Value  |
+--------------------------------------+--------+
| validate_password_check_user_name    | OFF    |
| validate_password_dictionary_file    |        |   #用于验证密码强度的字典路径；
| validate_password_length             | 8      |   #密码的最小长度；
| validate_password_mixed_case_count   | 1      |
| validate_password_number_count       | 1      |
| validate_password_policy             | MEDIUM |   #密码的级别；
| validate_password_special_char_count | 1      |
+--------------------------------------+--------+
7 rows in set (0.23 sec)

(4)此时需要修改两条参数信息

mysql> set global validate_password_policy=0;
Query OK, 0 rows affected (0.00 sec)mysql>
mysql> set global validate_password_length=6;
Query OK, 0 rows affected (0.00 sec)

（5）再次查看数据库参数信息

mysql> SHOW VARIABLES LIKE 'validate_password%';
+--------------------------------------+-------+
| Variable_name                        | Value |
+--------------------------------------+-------+
| validate_password_check_user_name    | OFF   |
| validate_password_dictionary_file    |       |
| validate_password_length             | 6     |
| validate_password_mixed_case_count   | 1     |
| validate_password_number_count       | 1     |
| validate_password_policy             | LOW   |
| validate_password_special_char_count | 1     |
+--------------------------------------+-------+
7 rows in set (0.00 sec)

（6）此时可以通过修改数据库的密码

mysql> alter user 'root'@'localhost' identified by '123456';
Query OK, 0 rows affected (0.04 sec)

[root@localhost ~]# mysqladmin -uroot -p'123456' password
mysqladmin: [Warning] Using a password on the command line interface can be insecure.
New password:
Confirm new password:
Warning: Since password will be sent to server in plain text, use ssl connection to ensure password safety.

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查看MySQL初始密码、解决MySQL5.7修改密码以及密码认证失败（Your password does not satisfy the current policy requirements）

1.安装MySQL时的初始密码，忘记MySQL的初始密码时，可以查看MySQL的初始密码；

2.修改密码时一直显示不成功，这时候应该查看参数；

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