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# k3s
a
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b
There a whole slew of things here. If you want the site to be HA, then you'd need 3 nodes.
If you're just wanting to update apps you can do the blue/green with replica or stateful sets and the right init/ready checks for your pods
That's all standard kube deployment stuff.
As far as the host OS goes, just pick something you're comfortable with, or barring that, something you have (or can buy in a pinch) support for.
h
b
^^ Pro-Tip.
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