title: Can't install Kubernetes on Vagrant
body: <p>Use this guide to install Kubernetes on Vagrant cluster:</p>
  
  <p><a href="https://kubernetes.io/docs/getting-started-guides/kubeadm/" rel="noreferrer">https://kubernetes.io/docs/getting-started-guides/kubeadm/</a></p>
  
  <p>At <code>(2/4) Initializing your master</code>, there came some errors:</p>
  
  <pre><code>[root@localhost ~]# kubeadm init
  [kubeadm] WARNING: kubeadm is in beta, please do not use it for production clusters.
  [init] Using Kubernetes version: v1.6.4
  [init] Using Authorization mode: RBAC
  [preflight] Running pre-flight checks
  [preflight] Some fatal errors occurred:
      /proc/sys/net/bridge/bridge-nf-call-iptables contents are not set to 1
  [preflight] If you know what you are doing, you can skip pre-flight checks with `--skip-preflight-checks`
  </code></pre>
  
  <p>I checked the <code>/proc/sys/net/bridge/bridge-nf-call-iptables</code> file content, there is only one <code>0</code> in it.</p>
  
  <p>At <code>(3/4) Installing a pod network</code>, I downloaded <code>kube-flannel</code> file:</p>
  
  <p><a href="https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml" rel="noreferrer">https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml</a></p>
  
  <p>And run <code>kubectl apply -f kube-flannel.yml</code>, got error:</p>
  
  <pre><code>[root@localhost ~]# kubectl apply -f kube-flannel.yml
  The connection to the server localhost:8080 was refused - did you specify the right host or port?
  </code></pre>
  
  <p>Until here, I don't know how to goon.</p>
  
  <p>My <code>Vagrantfile</code>:</p>
  
  <pre><code>  # Master Server
    config.vm.define "master", primary: true do |master|
      master.vm.network :private_network, ip: "192.168.33.200"
      master.vm.network :forwarded_port, guest: 22, host: 1234, id: 'ssh'
    end
  </code></pre>