title: Is it safe to delete the journal file of mongodb?
body: <p>If I delete the 3.1G journal file, <code>sudo service mongodb restart</code> will fail. However, this file is taking too much space. How can I solve this problem? How can I remove it?</p>
  
  <pre class="lang-none prettyprint-override"><code>bash$ du -sh /var/lib/mongodb/*
  4.0K    _tmp
  65M auction_development.0
  128M    auction_development.1
  17M auction_development.ns
  3.1G    journal
  4.0K    mongod.lock
  </code></pre>