title: How does priorityClass Works
body: <p>I try to use priorityClass.</p>
  <p>I create two pods, the first has system-node-critical priority and the second cluster-node-critical priority.</p>
  <p>Both pods need to run in a node labeled with nodeName: k8s-minion1 but such a node has only 2 cpus while both pods request 1.5 cpu.
  I then expect that the second pod runs and the first is in pending status. Instead, the first pod always runs no matter the classpriority I affect to the second pod.</p>
  <p>I even tried to label the node afted I apply my manifest but does not change anything.</p>
  <p>Here is my manifest :</p>
  <pre><code>apiVersion: v1
  kind: Pod
  metadata:
    name: firstpod
  spec:
    containers:
    - name: container
      image: nginx
      resources:
        requests:
          cpu: 1.5
    nodeSelector:
      nodeName: k8s-minion1
    priorityClassName: cluster-node-critical
  ---
  apiVersion: v1
  kind: Pod
  metadata:
    name: secondpod
  spec:
    containers:
    - name: container
      image: nginx
      resources:
        requests:
          cpu: 1.5
    priorityClassName: system-node-critical
    nodeSelector:
      nodeName: k8s-minion1
  </code></pre>
  <p>It is worth noting that I get an error <code>&quot;unknown object : priorityclass&quot;</code> when I do <code>kubectl get priorityclass</code> and when I export my running pod in yml with <code>kubectl get pod secondpod -o yaml</code>, I cant find any <code>classpriority:</code> field.</p>
  <p>Here Are my version infos:</p>
  <pre><code>$ kubectl version
  Client Version: version.Info{Major:&quot;1&quot;, Minor:&quot;10&quot;, GitVersion:&quot;v1.10.0&quot;, GitCommit:&quot;fc32d2f3698e36b93322a3465f63a14e9f0eaead&quot;, GitTreeState:&quot;clean&quot;, BuildDate:&quot;2018-03-26T16:55:54Z&quot;, GoVersion:&quot;go1.9.3&quot;, Compiler:&quot;gc&quot;, Platform:&quot;linux/amd64&quot;} 
  Server Version: version.Info{Major:&quot;1&quot;, Minor:&quot;10&quot;, GitVersion:&quot;v1.10.0+coreos.0&quot;, GitCommit:&quot;6bb2e725fc2876cd94b3900fc57a1c98ca87a08b&quot;, GitTreeState:&quot;clean&quot;, BuildDate:&quot;2018-04-02T16:49:31Z&quot;, GoVersion:&quot;go1.9.3&quot;, Compiler:&quot;gc&quot;, Platform:&quot;linux/amd64&quot;}
  </code></pre>
  <p>Any ideas why this is not working?</p>
  <p>Thanks in advance,</p>
  <p>Abdelghani</p>