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/.
failure: repodata/repomd.xml from base-source: [Errno 256] No more mirrors to try. http://linuxsoft.cern.ch/cern/centos/7/os/Sources/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found ERROR: Job failed: exit code 1
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