总结写在前面
一般情况照着这里三步执行 就实现所有用户都要用密码登录
sudo apt install mysql-server
update user set authentication_string=password("你的密码"),plugin='mysql_native_password' where user='root';
use mysql;
update user set host = '%' where user = 'root';
exit;
cd /etc/mysql/mysql.conf.d
sudo vim mysqld.cnf
# 注释掉里面的bind 127.0.0.1
service restart mysql
安装
一行命令就可以
sudo apt install mysql-server
问题
所有问题解决都需要先切换到系统root用户 或者sudo使用root用户权限
use mysql;
select user, plugin from user;
在mysql中执行上面两行
如果root对应的 plugin 是 auth_socket 就按照 问题三 解决
如果是 mysql_native_password 就按照 问题一二 解决
问题一
ruoke@ruoke:~$ mysql -u root -p
Enter password:
ERROR 1698 (28000): Access denied for user ‘root’@‘localhost’
解决：
use mysql;
#通常这一步会出现问题二错误
update user set authentication_string=password("你的密码") where user="root";
flush privileges;
问题二
密码策略问题异常信息：
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
解决：
#查看mysql密码策略
SHOW VARIABLES LIKE 'validate_password%';
#设置 validate_password_policy 密码验证强度 的全局参数为 LOW
set global validate_password_policy=LOW;
#设置密码长度 我默认使用 root 为密码 所以设置成4
set global validate_password_length=4;
#设置密码
update user set authentication_string=password("你的密码") where user="root";
bash记录：
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>
问题三
update user set authentication_string=password("你的密码"),plugin='mysql_native_password' where user='root';
如果还是出错
ERROR 1819 (HY000): Your password does not satisfy the current policy require
就再次
SHOW VARIABLES LIKE 'validate_password%';
查看自己最短的密码是不是设置好了
再次执行问题二的解决办法就可以了
可以多试试
flush privileges;
没准是玄学问题
问题四
远程用户不允许链接
ERROR 1130 (HY000): Host ‘192.168.43.38’ is not allowed to connect to this MySQL server
解决：
use mysql;
update user set host = '%' where user = 'root';
exit;
然后
service mysql restart
就可以了
至此基本所有情况都能解决了 QWQ 有问题欢迎讨论
问题五
ERROR 2003 (HY000): Can‘t connect to MySQL server on ‘192.168.136.8‘ (10061)
问题原因：3306端口默认本地访问 要设置允许远程访问
如果你从没用碰过防火墙 那这跟防火墙必然没用关系
网上大部分都是 让修改my.cnf 注释bind 127.0.0.1
然后事实上my.cnf 这个文件干净的很
正确姿势是
/etc/mysql/mysql.conf.d
下的 mysqld.cnf
里面注释掉
bind 127.0.0.1
参考博客：
https://blog.csdn.net/ls0111/article/details/75113970
https://www.cnblogs.com/cpl9412290130/p/9583868.html