title: MongoDB Data directory /data/db not found
body: <p>When I try to run Mongod in terminal I got this message : </p>
  
  <pre><code>2015-05-14T17:33:04.554+0700 I STORAGE  [initandlisten] exception in initAndListen: 29 Data directory /data/db not found., terminating
  2015-05-14T17:33:04.554+0700 I CONTROL  [initandlisten] dbexit:  rc: 100
  </code></pre>
  
  <p>and running mongo command  : </p>
  
  <pre><code>MongoDB shell version: 3.0.3
  connecting to: test
  2015-05-14T17:34:26.679+0700 W NETWORK  Failed to connect to 127.0.0.1:27017, reason: errno:111 Connection refused
  2015-05-14T17:34:26.681+0700 E QUERY    Error: couldn't connect to server 127.0.0.1:27017 (127.0.0.1), connection attempt failed
      at connect (src/mongo/shell/mongo.js:179:14)
      at (connect):1:6 at src/mongo/shell/mongo.js:179
  exception: connect failed
  </code></pre>
  
  <p>I Have tried to change permision in /var/lib/mongodb and /var/log/mongodb, but still doesnt work, and I tried to uninstall and install mongodb again, but still the same problem exist.
  Anyone could help? Thanks</p>
  
  <p>I'm using Ubuntu 14.04 LTS 64 bit </p>