MySQL 8.0 common (continuous update)

1, Change user password

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'root';

If appear ERROR 1396 (HY000): Operation ALTER USER failed for 'root'@'localhost'
Check root Whether the permission of is %, If it's a ’root’@‘localhost’ It is amended as follows ’root’@’%’

2,Job for mysql.service failed because a fatal signal was delivered to the control process And Server startup in progress error
I can only say my solution , The individual is in docker Why , Lead to this , So delete docker The container can solve

3:
3.1peewee.InternalError: (1366, "Incorrect string value: '\\xE6\\x89\\x80\\xE6\\x9C\\x89...' for column 'imp_version' at row 1")
The main problem is the coding format , To insert Chinese into the database, an error is reported .
First look at the database code

show create table vulnerability;

alter table vulnerability change imp_version imp_version varchar(500) character set utf8;

take table Tabular imp_version The field is set to the format utf-8 Of imp_version Field

3.2

peewee.DataError: (1406, “Data too long for column ‘info’ at row 1”)

solve ：

The length of the column in the database is not enough to accommodate the size of the data , You can put the one above varchar Of 500 Change it to 5000 Or other , As long as it can accommodate your size .

4, Complete installation steps

First, connect directly ：mysql -uroot -p, Because there is no password for the first installation , Go straight back into
Change encryption ：ALTER USER 'root'@'localhost' IDENTIFIED BY 'password' PASSWORD EXPIRE NEVER;

use mysql;
Database changed

update user set host = '%' where user ='root';
 send root You can connect remotely 
FLUSH PRIVILEGES;

Change Password ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password';
there localhost Remember to change it to %;
If appear ：Your password does not satisfy the current policy requirements, This is because 8.0 Password strategy ,
By this order SHOW VARIABLES LIKE 'validate_password%';
Through the command ：set global validate_password.number_count=0; Change password policy .
At this time, try to make a remote connection , If appear ERROR 2003 (HY000): Can't connect to MySQL server on
Remote connection failed , see mysql The configuration file ,ubuntu The path of /etc/mysql/mysql.conf.d/mysqld.cnf
The following figure ,bind-address Is the local address , Comment out this configuration , Restart remote access

If you still can't connect , Check the port , As shown in the figure, it is still 127.0.0.1

Then change the binding port to 0.0.0.0, You can reconnect （bind-address）.