title: Unable to see join nodes in Kubernetes master
body: <p>This is my worker node:</p>
  
  <pre><code>root@ivu:~# kubeadm join 10.16.70.174:6443 --token hl36mu.0uptj0rp3x1lfw6n --discovery-token-ca-cert-hash sha256:daac28160d160f938b82b8c720cfc91dd9e6988d743306f3aecb42e4fb114f19 --ignore-preflight-errors=swap
  [preflight] Running pre-flight checks.
          [WARNING Swap]: running with swap on is not supported. Please disable swap
          [WARNING FileExisting-crictl]: crictl not found in system path
  Suggestion: go get github.com/kubernetes-incubator/cri-tools/cmd/crictl
  [discovery] Trying to connect to API Server "10.16.70.174:6443"
  [discovery] Created cluster-info discovery client, requesting info from "https://10.16.70.174:6443"
  [discovery] Requesting info from "https://10.16.70.174:6443" again to validate TLS against the pinned public key
  [discovery] Cluster info signature and contents are valid and TLS certificate validates against pinned roots, will use API Server "10.16.70.174:6443"
  [discovery] Successfully established connection with API Server "10.16.70.174:6443"
  
  This node has joined the cluster:
  * Certificate signing request was sent to master and a response
    was received.
  * The Kubelet was informed of the new secure connection details.
  
  Run 'kubectl get nodes' on the master to see this node join the cluster.
  </code></pre>
  
  <p>While checking in master nodes using command <code>kubectl get nodes</code>, I can only able to see master:</p>
  
  <pre><code>ivum01@ivum01-HP-Pro-3330-SFF:~$ kubectl get nodes
  NAME                     STATUS    ROLES     AGE       VERSION
  ivum01-hp-pro-3330-sff   Ready     master    36m       v1.10.0
  </code></pre>
  
  <hr>
  
  <p>For question answer:</p>
  
  <ol>
  <li>docker kubelet kubeadm kubectl installed fine</li>
  <li><code>kubectl get node</code> can not see the current added node; of cause <code>kubectl get pods --all-namespaces</code> has no result for this node;</li>
  <li><code>docker</code> which in current node has no report for <code>kubeadm</code> command(means no k8s images pull, no running container for that)</li>
  <li>must import is <code>kubelet</code> not running in work node </li>
  <li><p>run <code>kubelet</code> output: </p>
  
  <blockquote>
    <p>Failed to get system container stats for "/user.slice/user-1000.slice/session-1.scope": failed to get cgroup stats for "/user.slice/user-1000.slice/session-1.scope": failed to get container info for "/user.slice/user-1000.slice/session-1.scope": unknown container "/user.slice/user-1000.slice/session-1.scope"</p>
  </blockquote>
  
  <p>same as <a href="https://github.com/kubernetes/kubernetes/issues/57080" rel="nofollow noreferrer">this issue said</a></p></li>
  <li>tear down and reset cluster(<code>kubeadm reset</code>) and redo that has no problem in my case. </li>
  </ol>