title: I can't run zookeeper
body: <p>i am new to the kafka world,
  i want to start zookeeper then when i type this</p>
  
  <pre><code>bin/zookeeper-server-start.sh config/zookeeper.properties
  </code></pre>
  
  <p>I got the following error</p>
  
  <pre><code>ERROR Unexpected exception, exiting abnormally  (org.apache.zookeeper.server.ZooKeeperServerMain)
  java.net.BindException: Address already in use
  
  ERROR Unexpected exception, exiting abnormally (org.apache.zookeeper.server.ZooKeeperServerMain)
  java.net.BindException: Address already in use
  </code></pre>
  
  <p>Then i tried <code>netstat -nlp|grep 2181
  </code> but there is no process running </p>
  
  <pre><code>tcp        0      0 0.0.0.0:2181            0.0.0.0:*               LISTEN      -  
  </code></pre>
  
  <p>Some light please</p>