title: Hadoop YARN Web UI is not available
body: <p>I am installing on linux VM hadoop-2.7.2.
  <a href="http://localhost:8042/node/node" rel="nofollow">http://localhost:8042/node/node</a> is available
  <a href="http://localhost:8088/cluster" rel="nofollow">http://localhost:8088/cluster</a>  is NOT (ResourceManager)</p>
  
  <p>I tried to play with files:</p>
  
  <pre><code>/etc/hosts
  /etc/sysconfig/network
  /etc/sysctl.conf
  /opt/hadoop/hadoop-2.7.2/etc/hadoop/yarn-site.xml
  </code></pre>
  
  <p>I tried to follow <a href="http://hadoop.apache.org/docs/r2.7.2/hadoop-project-dist/hadoop-common/SingleCluster.html" rel="nofollow">this page</a> and <a href="http://hadoop.apache.org/docs/r2.7.2/hadoop-project-dist/hadoop-common/SingleCluster.html#YARN_on_Single_Node" rel="nofollow">this page</a>. </p>
  
  <p>But the <code>http://localhost:8088/cluster</code> page is still unavailable.</p>
  
  <p>Could you please advise how to resolve the issue?
  Thank you</p>