Centos8 installation mysql8.0.22 tutorial

The installation steps are as follows :

1. uninstall

yum remove -y mysql
find / -name mysql // Found residual files , Re pass rm -rf Delete the corresponding file 

2. download

wget https://dev.mysql.com/get/mysql80-community-release-el8-1.noarch.rpm
yum install mysql80-community-release-el8-1.noarch.rpm

3. Check the data source

see mysql Source installed successfully ：

yum repolist enabled | grep "mysql.*-community.*"

4. Ban CentOS8 Bring their own mysql modular

yum module disable mysql //  To disable the command 

5. install mysql command

yum install mysql-community-server --nogpgcheck

Is this ok [y/Y] always y to the end

6. start-up mysql

Start up mysql when , There's a problem :

[[email protected] soft]# service mysqld start // Start command 

Have a problem
correct Start command :

[[email protected] soft]# /bin/systemctl start mysqld.service// Start command 
[[email protected] soft]# service mysqld status //

7. Show mysql Random password of

grep 'temporary password' /var/log/mysqld.log

The password is host: The next string of characters .

8. Log in and modify mysql password

mysql -u root -p // Enter the password generated above 

Pay attention to changing password , The password here is changed to “Root_21root”

ALTER USER 'root'@'localhost' IDENTIFIED BY 'Root_21root'; // Because when we change the password casually , Generally, it is not satisfied with its strategy 
 The following errors will be reported :
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

 terms of settlement :
 Be sure to change the default password to : Root_21root  Meet its strategy , Then perform the following operations :
SHOW VARIABLES LIKE 'validate_password%'; // Check password policy 

 Change password length ：
set global validate_password.length=1; //（ length ）
 Change password level ：
set global validate_password.policy=0; //（ Grade ）
 Set the password you want :
ALTER USER 'root'@'localhost' IDENTIFIED BY '123456';

Strategy before modification :

Modified policy :

9.Mysql8.0.22 Open remote access

create user 'root'@'%' identified by 'root123'; //1、 Create permission record first 
grant all privileges on *.* to 'root'@'%' with grant option; //2、 to grant authorization 

Open the firewall port
Open directly in the security group mysql Port number
solve 2059 - Authentication plugin ‘caching_sha2_password’ cannot be loaded:
From the error message caching_sha2_password Can't load .

The above error is due to the fact that the existing client connection software does not support Mysql8 New encryption method caching_sha2_password, So we need to change the way users encrypt , Change it to the old encryption verification method . You can see that the encryption method of the current user is caching_sha2_password. Execute the following command :

use mysql;
select user,plugin from user where user='root';
alter user 'root'@'%' identified with mysql_native_password by '[email protected]';// Change the user's encryption mode to mysql_native_password.
flush privileges;// This must be implemented , Execute the command to make the permission configuration item take effect immediately .

Try connecting again Mysql, Successful connection .
Sketch Map ：

Reprint ：https://blog.csdn.net/qq_39150374/article/details/112471108