title: Select node where the other POD does not exist
body: <p>I have two nodes</p>
  
  <p><code>
  gke-1789571565414321321-a3ec9151-node-q0cz
  gke-98798532417432432421-a3ec9151-node-q0cz
  </code></p>
  
  <p>And I have two ReplicationController to deploy 2 pods, <strong>xxx</strong> &amp; <strong>yyy</strong>.</p>
  
  <p>What I want to: If <code>xxx</code> is deployed on one of the <code>node</code>, <code>yyy</code> should go to the other.</p>
  
  <p>I implement this by <code>spec.nodeName</code> property.</p>
  
  <p><strong>Is there a generic way to avoid indicating the specific node?</strong></p>
  
  <p>xxx:</p>
  
  <pre><code>{
    "apiVersion": "v1",
    "kind": "ReplicationController",
    "metadata": {
      "name": "xxx",
      "labels": { "name" : "xxx" }
    },
    "spec": {  
      "replicas": 1,
      "selector": {
        "name":"xxx"
      },
      "template": { 
        "metadata": {
          "labels": {
            "name":"xxx"
          }
        },
        "spec": { 
          "containers": [
            //...
          ],
          "nodeName" : "gke-1789571565414321321-a3ec9151-node-q0cz"
        }
      }
    }
  }
  </code></pre>
  
  <p>yyy:</p>
  
  <pre><code>{
    "apiVersion": "v1",
    "kind": "ReplicationController",
    "metadata": {
      "name": "yyy",
      "labels": { "name" : "yyy" }
    },
    "spec": {  
      "replicas": 1,
      "selector": {
        "name":"yyy"
      },
      "template": { 
        "metadata": {
          "labels": {
            "name":"yyy"
          }
        },
        "spec": { 
          "containers": [
            //...
          ],
          "nodeName" : "gke-98798532417432432421-a3ec9151-node-q0cz"
        }
      }
    }
  }
  </code></pre>