Jojo,
We are going to undeplo all VMs from old 4.2 opennebula. Then we are going to move the 4.x one.db to the 5.2. Then then upgrade the db, and then simpy synch the 4.2 datastore (0,1,2) to the new 5.2 storage.
I think the templates are in the one.db and hence the onedb upgrade will solve the template problem.
I am not sure if we need to old (remnant) deployment.xml files from the old version. But If so are they going to be compatible?
The next, even more important question, is “are the 4.x VM images compatible with 5.2?”
My hope is that one of the developers might see this thread and say “hey goofy, what are you thinkingg? this is not possible because it will break x, y and z!!” or better yet., they might say “the reason we did not chime in earlier is because this is such a no-brainer that we thought we would let you discover how-to on your own”
I will let you know how this works out for me.