# 第一步
 wget -i -c https://repo.mysql.com//mysql80-community-release-el7-3.noarch.rpm

# 第二步
yum -y install mysql80-community-release-el7-3.noarch.rpm

# 第三步
yum -y install mysql-community-server

如果报错：
Unable to find a match: mysql-community-server

解决：
先执行：yum module disable mysql
再执行：yum -y install mysql-community-server
最后在执行：yum -y install mysql-community-server