It just doesn’t work. Nothing in the documentation hints at this, but it’ll save you a lot of time to know it doesn’t work. You have to use NFSv3 for nfsroot.
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I am Richard W.M. Jones, a computer programmer. I have strong opinions on how we write software, about Reason and the scientific method. Consequently I am an atheist [To nutcases: Please stop emailing me about this, I'm not interested in your views on it] By day I work for Red Hat on all things to do with virtualization. I am a "citizen of the world".
My motto is "often wrong". I don't mind being wrong (I'm often wrong), and I don't mind changing my mind.
This blog is not affiliated or endorsed by Red Hat and all views are entirely my own.