title: How do I clear space on my main system drive on a Linux CentOS system?
body: <p>Sorry if this sounds dumb, but I'm not sure what to do.</p>
  
  <p>I've got an Amazon EC2 instance with a completely full Ephemeral drive ( the main drive with all the system files ).  Almost all the directories where I've installed things like Apache, MySQL, Sphinx, my applications, etc. are on a separate physical drive and have symlinks from the ephemeral drive.  As far as I am aware, none of thier data or logs write to the ephemeral drive, so I'm not sure what happened to the space.</p>
  
  <p>Obviously lots of system stuff is still on the ephemeral drive, but I'm not sure how to clear things off to make space.  My best guess is that amazon filled the drive when it did some auto updates to the system.  I'm trying to install some new packages, and update all my system packages via YUM, but the drive has no space.</p>
  
  <p>What should I do?</p>