[Infrastructures] state machines

[Matt S Trout]

Wesley Craig wrote:
> Stated so generally, I think I can come up with counter examples.  For 
> instance, if you make a full disk image before pushing out a change, you 
> can in fact "undo" the change, by restoring the backup.

This is precisely what Steve proposes as the *one* way that you can do a 
reliable undo.

This does, of course, assume that only the contents of the disk ever varies 
between machines of the same type, and that everything else (BIOS etc.) is 
configured identically before deployment and never changed afterwards.

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