打开/etc/yum.repos.d/epel.repo，将

[epel]
name=Extra Packages for Enterprise Linux 6 – $basearch

baseurl=http://download.fedoraproject.org/pub/epel/6/$basearch

mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-6&arch=$basearch
修改成：
[epel]
name=Extra Packages for Enterprise Linux 6 – $basearch
baseurl=http://download.fedoraproject.org/pub/epel/6/$basearch

mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-6&arch=$basearch

清理yum缓存
yum clean all
重新生成缓存
yum makecache