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<How to build your own CDN using BIND, GeoIP, Nginx, and Varnish ⁄ >

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In this article, we shall outline the steps required to build a private Content Delivery or Distribution Network (CDN) using Varnish Cache and Nginx. The goal is to build a CDN using free, readily available software but most importantly spend the least amount of funds possible. To this end, all nodes participating in this network are going to be virtual machines (Xen, Virtuozzo, OpenVZ, etc). Should you have any questions or comments on the configuration of this CDN, please post them in this forum: http://www.varnish-cache.info/

Our global CDN can not only keep the latest copy of static files closer to our global visitors but can also cache the most used pages (dynamic or not) in memory on the edge nodes! This means less trips to the geographically distant and slower Dynamic Node (see below). This is similar to what Akamai and other well known firms do, only at a fraction of the cost. However, in this article, and to keep things simple, we will only be caching static files.

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