Web Reference: If you have a proxy server, validate it is configured properly in /etc/yum.conf. Here is an example (your names, passwords, and port numbers will obviously be different). It seems that your yum variable $releasever is somehow corrupt, it usually is caused by missing centos-release package on the machine for some obscure reasons. You can check if you have the package by: rpm -qi centos-release You will probably see: "package centos-release is not installed" Troubleshoot yum failing check update This article explains how to fix CentOS® server issues with the yum cache not updating due to a failed check update. Several errors might display during this process depending on the issue's cause. The following breakdown shows how to identify and resolve these issues:
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