If you have a lot of virtual (or real) machines running Debian or Ubuntu and a limited internet connection, it can make a lot of sense to use apt-cacher-ng to create a local cache of the packages you use so that they are only downloaded once. The current version of apt-cacher-ng can also help out with yum repositories!
On CentOS, edit /etc/yum.conf and add:
If you have changed the default port of apt-cacher-ng from 3142, you will need to modify that. Our example file:
# This is the default, if you make this bigger yum won’t see if the metadata
# is newer on the remote and so you’ll “gain” the bandwidth of not having to
# download the new metadata and “pay” for it by yum not having correct
# It is esp. important, to have correct metadata, for distributions like
# Fedora which don’t keep old packages around. If you don’t like this checking
# interupting your command line usage, it’s much better to have something
# manually check the metadata once an hour (yum-updatesd will do this).
# PUT YOUR REPOS HERE OR IN separate files named file.repo
# in /etc/yum.repos.d
As you can see, our local apt-cacher-ng VM is 10.1.1.12.
Run yum update and check your apt-cacher-ng’s cache – you should now see some CentOS respositories cached there.