ubuntu安裝MySQL並解決遠程及其他用戶登錄問題 修改密碼問題

安裝

一行命令就可以

sudo apt install mysql-server

問題

所有問題解決都需要先切換到系統root用戶 或者sudo使用root用戶權限

use mysql;
select user, plugin from user; 

在mysql中執行上面兩行
如果root對應的 plugin 是 auth_socket 就按照 問題三 解決
如果是 mysql_native_password 就按照 問題一二 解決

問題一

ruoke@ruoke:~$ mysql -u root -p
Enter password:
ERROR 1698 (28000): Access denied for user ‘root’@‘localhost’

解決：

use mysql;
#通常這一步會出現問題二錯誤
update user set authentication_string=password("你的密碼") where user="root";
flush privileges;

問題二

密碼策略問題異常信息：
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

解決：

#查看mysql密碼策略
SHOW VARIABLES LIKE 'validate_password%';
#設置 validate_password_policy 密碼驗證強度 的全局參數爲 LOW
set global validate_password_policy=LOW;
#設置密碼長度 我默認使用 root 爲密碼 所以設置成4
set global validate_password_length=4;
#設置密碼
update user set authentication_string=password("你的密碼") where user="root";

bash記錄：

root@ruoke:/etc/mysql# mysql
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.7.30-0ubuntu0.18.04.1 (Ubuntu)

Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.

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> update user set authentication_string=password("root~") where user="root";
ERROR 1046 (3D000): No database selected
mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> update user set authentication_string=password("root") where user="root";
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
mysql> SHOW VARIABLES LIKE 'validate_password%';
+--------------------------------------+--------+
| Variable_name                        | Value  |
+--------------------------------------+--------+
| validate_password_check_user_name    | OFF    |
| validate_password_dictionary_file    |        |
| validate_password_length             | 8      |
| validate_password_mixed_case_count   | 1      |
| validate_password_number_count       | 1      |
| validate_password_policy             | MEDIUM |
| validate_password_special_char_count | 1      |
+--------------------------------------+--------+
7 rows in set (0.00 sec)

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

mysql> set global validate_password_length=4;
Query OK, 0 rows affected (0.00 sec)

mysql> update user set authentication_string=password("root") where user="root";
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 1

mysql>

問題三

update user set authentication_string=password("你的密碼"),plugin='mysql_native_password' where user='root';

如果還是出錯

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

就再次

SHOW VARIABLES LIKE 'validate_password%';

查看自己最短的密碼是不是設置好了

再次執行問題二的解決辦法就可以了

可以多試試

flush privileges;

沒準是玄學問題

問題四

遠程用戶不允許鏈接
ERROR 1130 (HY000): Host ‘192.168.43.38’ is not allowed to connect to this MySQL server

解決：

use mysql;
update user set host = '%' where user = 'root';
exit;

然後

service mysql restart

就可以了

至此基本所有情況都能解決了 QWQ 有問題歡迎討論

參考博客：
https://blog.csdn.net/ls0111/article/details/75113970
https://www.cnblogs.com/cpl9412290130/p/9583868.html