title: How to close docker environment from the outside world?
body: <p>I have defined the following Jelastic configuration for my environment:</p>
  
  <pre><code>env:
    topology:
      nodes:
        - nodeGroup: bl 
          nodeType: nginx-dockerized
          tag: 1.14.2
          displayName: Node balancing
          count: 1
          fixedCloudlets: 1
          cloudlets: 4
          env:
            DOCKER_EXPOSED_PORT: 22,80,443
        - image: jenkins/jenkins:lts
          count: 1
          cloudlets: 16
          nodeGroup: cp
        - nodeGroup: sqldb
  </code></pre>
  
  <p>Now, I want the users of my environment to access my docker application only through the load balancing node. From Jelastic's dashboard, I can't seem to configure any firewall rules for the cp node group. How can I close any connection to the Jenkins node from the outside world and only keep it open from the nginx node?</p>