title: How to add user of jenkins container(jenkins) in group(users) inside container itself?
body: <p>When I access my container:</p>
  
  <pre><code>jenkins@bc145b8cfc1d:/$ docker ps
  </code></pre>
  
  <p>Cannot connect to the Docker daemon. Is the docker daemon running on this host?</p>
  
  <pre><code>jenkins@bc145b8cfc1d:/$ whoami
  jenkins</code></pre>
  
  <pre><code>jenkins@9cdb24cf71f2:/$ usermod -G users jenkins
  ERROR : usermod: Permission denied.**
  </code></pre>