title: Failing to start PostgreSQL server on Centos
body: <p>I just followed this tutorial:</p>
  
  <p><a href="http://www.unixmen.com/postgresql-9-4-released-install-centos-7/" rel="nofollow noreferrer">http://www.unixmen.com/postgresql-9-4-released-install-centos-7/</a></p>
  
  <p>But I can't start my postgres server on my centOS 6.5 machine.</p>
  
  <p>Here's the error:</p>
  
  <pre><code>[root@vm5 ~]# service postgresql-9.4 initdb
  Data directory is not empty!
  [root@vm5 ~]# service postgresql-9.4 start                 [FAILED]
  Starting postgresql-9.4 service:                           [FAILED]
  [root@vm5 ~]# /etc/init.d/postgresql-9.4 start
  Starting postgresql-9.4 service:                           [FAILED]
  </code></pre>
  
  <p>Before that tutorial I had already tried this one:</p>
  
  <p><a href="https://wiki.postgresql.org/wiki/YUM_Installation" rel="nofollow noreferrer">https://wiki.postgresql.org/wiki/YUM_Installation</a></p>
  
  <p>I don't know what else to do. </p>