This exact functionality is available via the Yum Priorities plugin.

http://wiki.centos.org/PackageManagement/Yum/Priorities


On Tue, May 6, 2014 at 8:19 AM, Michael Tiernan <[log in to unmask]> wrote:
On 5/5/14 5:19 PM, Mattieu Puel wrote:

>> Those services admins thus may install new repositories and sysadmins
>> cannot be sure that those repositories are disabled (which I agree would
>> be the right approach).
I don't disagree. I'd like to allow some repos to do automatic updates
but some others to be available but not automatically massaged.

Maybe a comprimise may be made where there's a priority threshhold. If
the repo's above a certain priority then it is not used for auto
updates. (Or the opposite.)

There must be a config file for the autoupdate operation (I haven't looked).

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