Dnf is already there in fedora which is a test bed for Rhel/centos but why centos 7 is still using yum ?
closed as primarily opinion-based by jasonwryan, Thomas Dickey, Anthon, Kusalananda♦, Jeff Schaller♦ Aug 4 '16 at 10:16
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CentOS 7 corresponds to Red Hat Enterprise Linux 7, released in June 2014. dnf was made the replacement for yum in Fedora 23, released in November 2015. There's no provision for making fundamental changes to a release like that. Changes made within a release are incremental, perhaps adding features, but never removing existing features and replacing them by others.
A future release of CentOS likely will have
dnf unless Red Hat chooses some other tool by the time Red Hat releases version 8, etc.
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