title: Execute a job when node connect itself to Jenkins
body: <p>I have a Jenkins server and two nodes. 
  I want to execute a basic <code>ip a</code> command on a node when it first connect to the Jenkins server. </p>
  
  <p>The problem is that when Node1 connect itself, the job trigger on Node 1 BUT
  When Node2 connect to the server, the job trigger AGAIN on Node1... </p>
  
  <p>Can you please help me ?
  I use the java client for my nodes and a label called "Julien" </p>
  
  <p><a href="https://imgur.com/a/qnIX5Oo" rel="nofollow noreferrer">https://imgur.com/a/qnIX5Oo</a></p>
  
  <p>Thanks</p>