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YUM Install error: One of the configured repositories failed (Unknown),

Problem 

User gets the following error when trying to run yum command

yum check-update --verbose

One of the configured repositories failed (Unknown),

and yum doesn't have enough cached data to continue. At this point the only
safe thing yum can do is fail. There are a few ways to work "fix" this:

....

Cannot find a valid baseurl for repo: base/$releasever/x86_64

 

It means yum cannot find the proper URL to download from this repository. because it cannot understand the version of your CentOS

Run the following command

 echo 7 > /etc/yum/vars/releasever