如果在配置是出現

http://dl.fedoraproject.org/pub/epel/6//repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"

http://repo.percona.com/centos/6/os//repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"

等問題，請替換相應yum配置檔案 /etc/yum.repos.d/extra_repos.repo中的相應連結如下：

http://dl.fedoraproject.org/pub/epel/6/x86_64//

http://repo.percona.com/centos/6/os/x86_64//