查看 yum 源: 

sudo yum repolist

更新元数据: 

sudo yum makecache fast

删除已有源: 

cd /etc/yum.repos.d/
ls
sudo rm epel.repo

删除库的 .rpm 包: 

rpm -qa | grep epel
yum remove epel-release-6-8.noarch

yum install epel-release -y
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