<p>I tried to use <code>microk8s add-node</code> in first machine. and second machine, I tried to <code>microk8s join &lt;&gt;:&lt;&gt;/&lt;&gt; --worker</code> but it returns this:</p>
<blockquote>
<p>the host name of the joining node does not resolve to the IP Refusing join (400)</p>
</blockquote>

<p>You need to make sure the control plane node can also resolve the hostname of the workers.</p>
<p>Add on the <code>/etc/hosts</code> of the control plane node: e.g.:</p>
<pre><code>192.168.0.10 workerName
</code></pre>
