title: Hadoop setup issue: "ssh: Could not resolve hostname now.: No address associated with hostname"
body: <p>When I build hadoop cluster  based on vmware, and I use <code>sbin/start-dfs.sh</code> command, I meet the problem about ssh. It says, </p>
  
  <blockquote>
    <p>ssh: Could not resolve hostname now.: No address associated with hostname</p>
  </blockquote>
  
  <p>I have used <code>vi /etc/hosts</code> command to check the hostname and IP address, and <code>vi /etc/profile</code> command. I ensure that there is no fault.</p>