title: mongod, mac os x - rlimits warning
body: <p>I've been using mongo on my mac os x 10.8 and suddenly yesterday at my logs appeared this warning (and when starting shell it's present too) - </p>
  
  <blockquote>
    <p>WARNING: soft rlimits too low. Number of files is 256, should be at least 1000</p>
  </blockquote>
  
  <p>Who could explain, what does it mean? And should I increase number of <strong>rlimits</strong> somehow?</p>