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安装MysqL 8.0版本

系统环境：

CentOS Linux release 8.1.1911 (Core) 

添加源

rpm -Uvh https://repo.MysqL.com//MysqL80-community-release-el8-1.noarch.rpm
dnf clean all

安装

dnf install MysqL MysqL-server MysqL-devel

启动并设置开机自启

systemctl enable MysqLd
systemctl start MysqLd

修改root密码

[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。