Getting started with firewalld

I'm mostly writing this for my own reference as I spent a bunch of time figuring this out while I was on holidays with some serious oVirt misadventures and didn't document any of what I did, so since I had to reinstall CentOS 7, I'm stuck doing this all over again.

Effectively I'm migrating from CentOS 6 to CentOS 7 and trying to take advantage of the new way of doing things. I could easily ...

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