vim /etc/yum.repos.d/epel.repo

[epel]

name=Extra Packages for Enterprise Linux 7 - $basearch

#baseurl=http://download.fedoraproject.org/pub/epel/7/$basearch

mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=$basearch

修改完

[epel]

name=Extra Packages for Enterprise Linux 7 - $basearch

baseurl=http://download.fedoraproject.org/pub/epel/7/$basearch

#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=$basearch

Cannot retrieve metalink for repository: epel/x86_64. Please verify its path