Test at Red Hat Enterprise Linux Server release 7.5 (Maipo)
File localtion /etc/yum.repos.d/epel.repo
Refrer to https://www.jianshu.com/p/25a63cbf1e9d
Aliyum rep at http://mirrors.aliyun.com/epel/
#step 1 cd /etc/yum.repos.d/
#step 2 touch epel.repo
#step 3 vi epel.repo and copy all script to there
#step 4 yum clean all
#step 5 yum makecache
[epel]
name=Extra Packages for Enterprise Linux 7 - $basearch
enabled=1
failovermethod=priority
baseurl=http://mirrors.aliyun.com/epel/7/$basearch
gpgcheck=0
gpgkey=http://mirrors.aliyun.com/epel/RPM-GPG-KEY-EPEL-7