<p>I set up a kubernetes cluster. And I want to add a master node to the cluster. my cluser version is 1.17.0 . what's the join command is? i can't find  Related docs about the command on the official website.</p>

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<p>To join another master follow the below steps:</p>

<ol>
<li><p>Generate the certificate key</p>

<blockquote>
  <p><code>kubeadm alpha certs certificate-key</code></p>
</blockquote></li>
<li><p>Print the join command</p>

<blockquote>
  <p><code>kubeadm token create --print-join-command</code></p>
</blockquote></li>
<li><p>Add the following flags to the above join command </p>

<blockquote>
  <p><code>--control-plane --certificate-key "Certificate-key from step 1"</code></p>
</blockquote></li>
<li><p>Command should look like below</p>

<blockquote>
  <p><code>sudo kubeadm join 192.168.0.200:6443 --token 9vr73a.a8uxyaju799qwdjv --discovery-token-ca-cert-hash sha256:7c2e69131a36ae2a042a339b33381c6d0d43887e2de83720eff5359e26aec866 --control-plane --certificate-key f8902e114ef118304e561c3ecd4d0b543adc226b7a07f675f56564185ffe0c07</code></p>
</blockquote></li>
</ol>
