title: AWS cloudFormation doesn't work with official Centos 6 AMI
body: <p>I can't get the most simple cloudFormation UserData block to work with Centos 6 AMI.</p>
  
  <pre><code>"UserData" : {"Fn::Base64" : { "Fn::Join" : ["",[
      "#!/bin/bash -ex","\n",
      "sudo touch /root/aws-test.txt"]]}
  }
  </code></pre>
  
  <p>It works fine with Amazon Linux but nothing happens with the Centos AMI. Any suggestions?</p>