title: “No X11 DISPLAY variable” - what does it mean?
body: <p>I installed Jmeter on one of my Mesos nodes, but I can not run it I have this error that appears</p>
  
  <pre><code>================================================== ==============================
  Do not use GUI mode for load testing, only for Test creation and Test debugging.
  For load testing, use CLI Mode (was NOT GUI):
     jmeter -n -t [jmx file] -l [results file] -e -o [Path to web report folder]
  &amp; increase Java Heap to meet your test requirements:
     Modify current env variable HEAP = "- Xms1g -Xmx1g -XX: MaxMetaspaceSize = 256m" in the jmeter batch file
  Check: https://jmeter.apache.org/usermanual/best-practices.html
  ================================================== ==============================
  An error occurred: Can not connect to the window server using ': 0' as the value of the DISPLAY variable.
  </code></pre>