下载rmp版本

https://dev.mysql.com/downloads/repo/yum/

centos7直接可用

wget https://dev.mysql.com/get/mysql80-community-release-el7-4.noarch.rpm

安装

yum install https://dev.mysql.com/get/mysql80-community-release-el7-4.noarch.rpm

清理yum缓存

yum clean all

重建缓存

yum makecache

安装

yum install mysql80-community-release-el8-3.noarch.rpm

启动MySQL

systemctl start mysqld

查看MySQL状态

systemctl status mysqld

开机自启

systemctl enable mysqld

重新加载系统配置，使开机自启立马有效

systemctl daemon-reload

登录MySQL8

MySQL较大的变动就是，第一次安装会给root用户一个临时密码，我们需要拿到这个临时密码：

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

重置密码

ALTER USER USER() IDENTIFIED BY ‘Admin123!’;

修改密码（密码复杂度要满足规则）

ALTER USER "root"@"%" IDENTIFIED BY "*****";