title: zookeeper Supervisor returned FATAL. Please check the role log file, stderr, or stdout
body: <p>I try to run zookeeper, but I have an error :Failed to start role.</p>
  
  <pre><code>at org.apache.zookeeper.server.persistence.FileTxnSnapLog.restore(FileTxnSnapLog.java:196)
      at org.apache.zookeeper.server.ZKDatabase.loadDataBase(ZKDatabase.java:223)
      at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:417)
      at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:409)
      at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:156)
      at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:116)
      at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:79)
  2016-03-01 10:55:38,873 ERROR org.apache.zookeeper.server.quorum.QuorumPeerMain: Unexpected exception, exiting abnormally
  java.lang.RuntimeException: Unable to run quorum server 
      at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:454)
      at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:409)
      at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:156)
      at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:116)
      at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:79)
  Caused by: java.io.FileNotFoundException: /var/lib/zookeeper/version-2/log.d00015690 (Permission denied)
      at java.io.FileInputStream.open(Native Method)
      at java.io.FileInputStream.&lt;init&gt;(FileInputStream.java:146)
      at org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.createInputArchive(FileTxnLog.java:574)
      at org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.goToNextLog(FileTxnLog.java:543)
      at org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.next(FileTxnLog.java:625)
      at org.apache.zookeeper.server.persistence.FileTxnSnapLog.restore(FileTxnSnapLog.java:196)
      at org.apache.zookeeper.server.ZKDatabase.loadDataBase(ZKDatabase.java:223)
      at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:417)
  </code></pre>
  
  <p>any help please !</p>