title: Full Clustering in Apache Traffic Server
body: <p>I followed the steps mentioned in the <a href="https://trafficserver.readthedocs.org/en/latest/admin/cluster-howto.en.html#full-clustering" rel="nofollow">official documentation</a> for full clustering of multiple ATS instances. I installed 2 instances of ATS on 2 different Ubuntu machines (having the same specs, OS versions and hardware), and both of these act as a reverse proxy for web service hosted on a Tomcat server in a different machine. I wasnt able to set up the cluster. Here are some of the queries that I have.</p>
  
  <ul>
  <li><p><strong>They are on the same switch or same VLAN</strong> : The two Ubuntu machines on which I installed the ATS are connected to the same switch. They have the same interface mentioned in the <code>/etc/network/interfaces</code>. Are these enough or there is something else that has to be done to get the clustering?.</p></li>
  <li><p>Running the comment <strong>traffic_line -r proxy.process.cluster.nodes</strong> : This returned <code>1</code> after I ran the <code>traffic_line -x</code> and <code>traffic_line -L</code> commands. But, in the cluster.config file, there isnt any additions or changes.</p></li>
  </ul>
  
  <p>Moreover, when I make a query to one of these ATS instances (I have mapped the URLs in the <code>remap.config</code> file), both of them cache the responses locally and is not shared across. </p>
  
  <p>From this information, can anyone tell me if I am doing something wrong. Let me know if anymore info is required.</p>