http://mirrors.cloud.aliyuncs.com/centos/6/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
Trying other mirror.
To address this issue please refer to the below wiki article
https://wiki.centos.org/yum-errors
If above article doesn‘t help to resolve this issue please use https://bugs.centos.org/.
base | 3.7 kB 00:00
base/group_gz | 242 kB 00:00
base/filelists_db | 6.4 MB 00:00
base/primary_db | 4.7 MB 00:00
base/other_db | 2.8 MB 00:00
convirt-dep | 504 B 00:00
http://www.convirture.com/repos/deps/RHEL/6.x/repodata/repomd.xml: [Errno -1] Error importing repomd.xml for convirt-dep: Damaged repomd.xml file
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: convirt-dep. Please verify its path and try again
解决办法
rm -rf /etc/yum.repos.d/convirt.repo
yum clean all
yum makecache
原文：https://www.cnblogs.com/littlehb/p/11137166.html