1、下载epel源的rpm包

wget https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm

2、安装

rpm -ivh epel-release-latest-7.noarch.rpm

3、去除check

vi /etc/yum.repos.d/epel.repo
将gpgcheck=1修改为gpgcheck=0