How To Fix: Could not get metalink for EPEL

Quick Fix

Error message:

Could not get metalink https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=x86_64 error was 14: HTTPS Error 503 - Service Unavailable

Fix:

sudo rpm --query --file  /etc/pki/tls/certs/ca-bundle.trust.crt

Output (will change as time goes on):

ca-certificates-2018.2.22-70.0.el7_5.noarch

Copy and paste output, and then run:

sudo yum reinstall ca-certificates-2018.2.22-70.0.el7_5.noarch

Then try yum update again.