<p>my problem is the same: i have an extra laptop and want use it like a kubernetes worker node, instead having the master node and worker node  in the same machine(like minikube).
the machine with the master node and the laptop with worker node are on the same LAN.
but i have no idea about the technology which i have to use (openshift or something else)
thanks for all</p>

colo
<p>If you opt for creating Highly Available Clusters on bare metal, just follow official kubernetes.io's tutorial: <a href="https://kubernetes.io/docs/setup/independent/high-availability/" rel="nofollow noreferrer">Creating Highly Available Clusters with kubeadm</a>, take option: with stacked control plane nodes.</p>
