[CentOS] Restricting mirrors off a repo

Thu Jan 19 21:57:29 UTC 2017
Mauricio Tavares <raubvogel at gmail.com>

What is the best way to specify which mirrors off a repository you want to
use? Have a host with rather restricted egress rules and want to allow it
to reach a couple of mirrors for each repo it needs. And, yes, I am not
ready to mirror them locally.