yum makecache时报错[Errno 14] PYCURL ERROR 22 - “The requested URL returned error: 404 Not Found“

yum makecache时报错[Errno 14] PYCURL ERROR 22 - “The requested URL returned error: 404 Not Found“

centos6更换yum源为阿里源，前面都没有问题，但进行yum makecache操作会报错[Errno 14] PYCURL ERROR 22 - “The requested URL returned error: 404 Not Found”

报错如下：

http://mirrors.aliyun.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.
http://mirrors.aliyuncs.com/centos/6/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 7 - "couldn't connect to host"
Trying other mirror.
http://mirrors.cloud.aliyuncs.com/centos/6/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.cloud.aliyuncs.com'"
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: base. Please verify its path and try again

阿里云的centos源不能用了。
解决：

wget -O /etc/yum.repos.d/CentOS-Base.repo http://file.kangle.odata.cc/repo/Centos-6.repo

wget -O /etc/yum.repos.d/epel.repo http://file.kangle.odata.cc/repo/epel-6.repo

然后再：yum makecache，成功。