下载包：wget https://repo.mysql.com//mysql80-community-release-el7-1.noarch.rpm

更新rpm缓存：sudo rpm -ivh mysql80-community-release-el7-1.noarch.rpm

安装mysql-server：sudo yum install mysql-community-server --nogpgcheck 强制安装，避免出现公钥尚未安装的情况（–nogpgcheck）

启动服务：systemctl start mysqld.service

获取初始密码：sudo cat /var/log/mysqld.log | grep password
Gu?rugGyW2mz

登录：mysql -u root -p

修改密码策略sudo vi /etc/my.cnf

修改密码：