安装epel源后，报错Error: Cannot retrieve metalink for repository: epel. Please verify i

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                      wget https://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm
rpm -ivh epel-release-latest-6.noarch.rpm
yum -y install iftop
报错：Error: Cannot retrieve metalink for repository: epel. Please verify its path and try again
是因为/etc/yum.repos.d/epel.repo配置文件中源地址没有生效
vim /etc/yum.repos.d/epel.repo
[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
failovermethod=priority
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6

修改成：

[epel]

..

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

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

...

保存退出后，清理源
yum clean all
yum -y install iftop    既可以成功安装。