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I’d recommend the CentOS plugin protectbase this plugin will help when dealing with multiple 3rd party repos or just EPEL/RPMForge
You can use “yum --disablerepo=[reponame] …” but that’s a single use option if you’d like to protect your system continuously then I’d highly recommend the “protectbase”
“yum install yum-plugins-protectbase”
Then add “protect=1” on the repos you’d want to protect. Aka CentOS-Base And add “protect=0” to epel.repo this should solve most common conflicts when dealing with 3rd party repositories.
I created a more in-depth guide on my blog here Dealing with multiple repositories on CentOS 4/5/6/7
Try to reun there 2 commands, run them as sudo user wget http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-5.noarch.rpm rpm -ivh epel-release-7-5.noarch.rpm