yum 異常解決一例

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

解決辦法
rm -rf /etc/yum.repos.d/convirt.repo
yum clean all
yum makecache