安裝eple源，在yum clean all；yum makecache 后出現報錯

Error: Cannot retrieve metalink for repository: epel. Please verify its path and try again

解決辦法：

sed -i 's/mirrorlist/\#mirrorlist/g' epel.repo?epel-testing.repo

sed -i 's/\#baseurl/baseurl/g' epel.repo epel-testing.repo

yum clean all

yum makecache