安装MySQL 8.0版本

系统环境：

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CentOS Linux release 8.1.1911 (Core)

添加源

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rpm -Uvh https://repo.mysql.com//mysql80-community-release-el8-1.noarch.rpm
dnf clean all

安装

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dnf install mysql mysql-server mysql-devel

启动并设置开机自启

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systemctl enable mysqld
systemctl start mysqld

修改root密码

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[root@centos8 ~]# mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 8.0.17 Source distribution

Copyright (c) 2000, 2019, 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> ALTER user 'root'@'localhost' IDENTIFIED BY 'PASSWORD';
Query OK, 0 rows affected (0.00 sec)

mysql> exit
Bye

Tips：密码必须包含大写字母、数字、特殊符号，不需要flush privileges来刷新权限。