title: How to identify process that generates data transfer out in EC2?
body: <p>I am hosting a small web-based application with Apache Web Server on EC2. On my monthly fee I usually see ~40GB usage of data transfer out, which cause about $5 or so a month.</p>
  
  <p>Although this is no big money, I am curious on how these data transfer out were generated. I am sure at Midnight there won't be anyone actually visiting the web-based application. And yet there are some data transfer out at ~50M per hour (as I can see from the details report from amazon).</p>
  
  <p>Is there any way to figure out what process actually generates those data-transfer out activity (even at Midnight when no one uses the web-application)?</p>
  
  <p>thanks!</p>
  
  <p>J.</p>