title: problem on starting cassandra
body: <p>I download apache-cassandra-0.8.5 for ubuntu and extract it.I read the readme file.
  I try bellow command in shell:</p>
  
  <pre><code>bin/cassandra -f
  </code></pre>
  
  <p>But it said:
  Error: Exception thrown by the agent : java.net.MalformedURLException: Local host name 
  unknown: java.net.UnknownHostException: node24.nise.local: node24.nise.local</p>
  
  <p>what should I do?</p>