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I don't know whether this is the "modern" way to build a k3s cluster on Harvester, but run MetalLB in the K3s cluster (Kube-VIP would work just as well, I just picked MetalLB and have stuck with it) and give the LB a range of IPs. I then have Træfic implement the routing for hosts/paths from a LoadBalancer which I manually allocate an IP address from the range I gave to MetalLB. Træfic gets TLS certs from cert-manager. Everything "just" works.