CentOS 7.x troubleshooting yum issues

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CentOS7.x troubleshooting yum issues

repomd.xml does not match metalink for epel

This problem may happen if there is wrong metadata cached for particular repistory. To solve this use: 

   yum --enablerepo=epel clean metadata

and try the yum command again. This time fresh metadata would be built. If you want to clear metadata for all repositories then use: 

   yum clean metadata

This is just a high level fix. The actual issue is often caused by ISP/security devices which redirect any request to a standard advertizement / login page. Often yum ends up downloading that advertizement / login page and hence metadata check fails. Opening any URL such as 'http://www.sbarjatiya.com', before running yum, after cleaning metadata might help in avoiding the issue to reappear.

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