Determining Yum repo URL

If I add a new repo file under /etc/yum.repo.d/ folder. How can I gather all the URL which yum update will go out to fetch updates.

I am asking this because I have a server behind a firewall, which will allow traffic only to predesignated domain names. I want to determine all the domain names so that I can whitelist them all, so that my server remains updated.

2 Answers

Use the verbose flag with yum repolist -v enabled

$ yum repolist -v enabled
Repo-id : epel
Repo-name : Extra Packages for Enterprise Linux 6 - x86_64
Repo-revision: 1565313214
Repo-updated : Thu Aug 8 19:14:15 2019
Repo-pkgs : 12,559
Repo-size : 11 G
Repo-metalink: Updated : Thu Aug 8 19:14:15 2019
Repo-baseurl : (50 : more)
Repo-expire : 21,600 second(s) (last: Sat Aug 10 10:54:19 2019)

If you want to get only the URLs,

$ yum repolist -v enabled | grep Repo-baseurl | cut -d\ -f 3

Or just grep the repo files directly

$ grep 'baseurl=' /etc/yum.repos.d/* | cut -d= -f2
ftp://
ftp://

You can grep the URL's used by yum from the /etc/yum.repo.d/* files.

Meanwhile, yum will download lists of URL's and attempt to use the fastest URL for downloading. Those lists can/will change, so you will have to configure the URL's you wish to use.