title: x509 Certificate signed by unknown authority - kubeadm
body: <p>I search the previews post for this but I can't find the solution, sorry.</p>
  
  <p>I install metrics server on kubeadm v1.12 and I get this error from the logs:</p>
  
  <p>1 master node and 1 slave node, in private network.</p>
  
  <pre><code>Get https://ip-10-0-1-154:10250/stats/summary/: x509: a certificate signed by an unknown authority, unable to fully scrape metrics from source 
  </code></pre>
  
  <p>I don't install any certificate.</p>
  
  <p>How can I install a new certificate and where I need to change this without set up a new kubernetes cluster?</p>
  
  <p>Sorry for the noob question, I tried to create a new certificate but I cannot make kubelet to change.</p>