title: kubectl drain and rolling update, downtime
body: <p>Does <code>kubectl drain</code> first make sure that pods with <code>replicas=1</code> are healthy on some other node?<br>
  Assuming the pod is controlled by a deployment, and the pods can indeed be moved to other nodes.
  Currently as I see it only evict (delete pods) from the nodes, without scheduling them first.</p>