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I followed this guy's guide to setup k3s using ansible. Maybe it'll help you. https://docs.technotim.live/posts/k3s-etcd-ansible/

I found a role 'xanmanning.k3s' which works great to install k3s and also have another role to register hosts with the Rancher instance via the API. What I need now is a way to poke the API and label hosts in Fleet - but thanks! I'll check it out.