Found this, which seems to indicate, yes it can be done.
On Mon, Nov 27, 2017 at 2:20 PM, Ed Greshko <ed.greshko(a)greshko.com> wrote:
On 11/27/17 21:34, Ger van Dijck wrote:
> Is there a way to upgrade Centos 6 to Centos 7 (32 Bits) in the same way
as I can
> upgrade Fedora 26 to Fedora 27 with the utility "dnf system-upgrade" ?
A quick Google search seems to indicate that upgrade from 6 to 7 is
best and disastrous at worse.
Google search term was "centos upgrade 6 to 7".
But you may find more help by going to https://www.centos.org/forums/
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