下载rpm包

wget https://repo.mysql.com/mysql80-community-release-el7-3.noarch.rpm

安装mysql

rom -ivh mysql80-community-release-el7-3.noarch.rpm

安装mysql-community-server，如果安装不上，进入/etc/yum.repos.d看下是否有mysql安装源

yum -y install mysql-server

启动mysql

systemctl start mysqld

mysql安装后系统会生成一个默认的root密码，执行以下命令获取

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

必须修改root密码后才能继续操作，修改root密码

mysql -u root -p

输入上面的临时密码

ALTER USER 'root'@'localhost' IDENTIFIED BY '新密码'