How to save $60 a month with 20 lines of code

We use Amazon AWS S3 service to store users pictures. There is huge amount of small pictures.

As the traffic at out WEB service increased, the cost for serving the pictures from the S3 increased also. Last month we had about 250 GB of traffic for pictures and this was around $60.

While we could move all the pictures to a separate static server this would imply some downtime and complexity in further migrations of our servers. And also reduce reliability.

I modified few lines in Nginx configuration to make it work as a proxy to Amazon S3:

   location @s3 {
       internal;
       proxy_pass           http://your-bucket-name.s3.amazonaws.com;
       proxy_store          on;
       proxy_store_access   user:rw  group:rw  all:r;
       proxy_temp_path      /var/static_data/tmp;
       root                 /var/static_data;
   }

   location ~* \.(jpg|jpeg|gif|png|ico|css|bmp|js|swf|mp3)$ {
       access_log           off;
       error_log            /var/log/nginx/static_cache_miss.log;
       expires              max;
       root                 /var/static_data;
       error_page           404 = @s3;
   }

Now the traffic for S3 has reduced from ~10 GB a day to less than 400 MB.