title: After K8s Master reboot, apiserver throws error “x509: certificate has expired or is not yet valid”
body: <p>I have multimaster kubernetes cluster setup using Kubespray.
  I ran an application using helm on it which increased the load on master drastically. this made master almost inaccessible. After that I shutdown masters one by one and increased RAM and CPU on them. But after rebooting, both apiserver and scheduler pods are failing to start. They are in "CreateContainerError" state.</p>
  
  <p>APIserver is logging lot of errors with the message <code>x509: certificate has expired or is not yet valid</code>.</p>
  
  <p>There are other threads for this error and most of them suggest to fix apiserver or cluster certificates. But this is newly setup cluster and certificates are valid till 2020.</p>
  
  <p>Here are some details of my cluster.</p>
  
  <pre><code>CentOS Linux release: 7.6.1810 (Core)
  Docker version: 18.06.1-ce, build e68fc7a
  </code></pre>
  
  <p>Kubernetes Version </p>
  
  <pre><code>Client Version: v1.13.2
  Server Version: v1.13.2
  </code></pre>