title: How to clear all osm tiles cache on my own server
body: <p>I'm currently working on a map project, based on OpenStreetMap, using Mapnik, renderd and mod_tile (like osm do on their website).
  I've built an osm tiles server, following some tutorials, on my personal computer (Ubuntu 12.04).
  It works well, and i've loaded a lot of regions of one country (not the entire planet, just some piece of the planet).</p>
  
  <p>I realized that mod_tile was using a cache for each tiles rendered, so i decided to investigate <strong>how i can clear that</strong>.
  <a href="http://wiki.openstreetmap.org/wiki/Tile_expire_methods">The only solution i found so far</a> was to use the <code>render_expired</code> binary, but i don't understand how i can set all tiles to expired by this way (moreover without diff files)...
  I was trying to find where these images are located but i don't find them.</p>
  
  <p>I need some help, so if someone has an idea ...</p>