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    <p>There exist certain modules for Apache 1.x and 2.x that will allow you to set a maximum on the transfer amount, most of them keep track using the scoreboard file that Apache generates (when mod_status is enabled with ExtendedStatus on). The one I still have bookmarked from when I was looking for one is <a href="http://www.steve.org.uk/Software/mod_curb/" rel="nofollow noreferrer" title="mod_curb">mod_curb</a>, however it is not complete and at the current moment in time looks to only work on a server-wide scale and not for individual virtual hosts.</p> <p>Apache modules can be set to be outbound filters, so you could write a costume module that would sit at the end of the chain, and add up all the outgoing packets, using the data that APR provides you can then add it to a counter for that specific domain/sub-domain. After that you have a choice of what to do with the data.</p> <p>For specific examples, take a look at mod_deflate that Apache provides, to see how it sits at the end of the chain and compresses everything but the headers the server sends out. This should give you a good start.</p> <p>As for log based processing, it becomes slower the more logs exist. This is just the nature of the beast. When we were using a log based solution we had a custom perl script that ran every 15 minutes. Eventually it would take longer than 15 minutes to parse, and since we had proper locking after a while multiple of these log processing perl scripts were now running, all waiting on each other. We ended up re-writing it with a simple call to tail -F, which then let perl parse each and every request as it came in, while not entirely efficient, it worked. The upside of that was that we were now able to update traffic statistics in near realtime so that clients were updated sooner rather than later if they went over their limits.</p>
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    1. POHow do you handle bandwidth billing on shared servers in apache?
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