title: How do linux file descriptor limits work?
body: <p>I was told that my server refused to accept client network connections at a specific port could be due to the lack of file descriptors. I looked up what this is all about and read about it here:  <a href="http://www.netadmintools.com/art295.html" rel="nofollow noreferrer">http://www.netadmintools.com/art295.html</a></p>
  <p>So I tested my system and I got this:</p>
  <pre><code>cat /proc/sys/fs/file-nr
  1088    0   331287
  </code></pre>
  <p>What does this mean?</p>
  <p>The second column actually stays at 0 even after I shutdown my server, it even stays at 0 even right after a boot!</p>