<p>If you are adding worker nodes to a cluster, as long as k8s and docker versions are the same, can you use different operating systems and different versions? I would think you are able to as long as the k8s pieces used within the OS are the same, but I have not tested this.</p>

mmiara
<p>Yes, a cluster can be heterogeneous with worker nodes of different operating systems. The services running on worker nodes are container runtime, kubelet and kube-proxy which should be compatible with the control plane version. You also need to make sure the CNI plugin is compatible with different operating systems in the cluster. </p>
