title: Hadoop two node cluster environment, NameNode’s web UI displays the number of live nodes as one and Dead nodes as zero
body: <p>I configured properly two node cluster environment for Hadoop, and Master is also configured for datanode as well.
  So currently I have two data nodes, without any issue I am able to start all the services in Master.
  Slave datanode is also able to stop start from Master Node.
  But when I am checking the health by using the url <code>http://&lt;IP&gt;:50070/dfshealth.jsp</code> Live node count is always showing only one not two.</p>
  
  <p>Master Process:</p>
  
  <pre><code>~/hadoop-1.2.0$ jps
  9112 TaskTracker
  8805 SecondaryNameNode
  9182 Jps
  8579 DataNode
  8887 JobTracker
  8358 NameNode
  </code></pre>
  
  <p>Slave Process:</p>
  
  <pre><code>~/hadoop-1.2.0$ jps
  18130 DataNode
  18380 Jps
  18319 TaskTracker
  </code></pre>
  
  <p>Please help me to know what I am doing wrong.</p>