Description of problem: The version of dnf-plugins-core provided for CentOS 7 in EPEL does not have the versionlock plugin (later versions do). Version-Release number of selected component (if applicable): dnf-0.6.4-2.el7.noarch dnf-plugins-core-0.1.5-3.el7.noarch Would it be possible to update the dnf-plugins-core package to a later version?
And it appears dnf has been removed from epel over the weekend. So, there's that as well.
No dnf, no problems ;)