[CentOS] upgrade reference docs

Is there a Centos 6.x to Centos 7.x guide somewhere? What has changed, that I 
need to learn about as an admin, before I jump in and flounder?


thanks,

-chuck


-- 
ACCEL Services, Inc.| Specialists in Gravity, Magnetics |  (713)993-0671 ph.
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  Houston, TX, 77008 |          Chuck Campbell           | campbell at accelinc.com
                     |  President & Senior Geoscientist  |

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