It’s clear that Varnish and high-traffic portals like Twitter and Facebook go hand in hand. A write up on highscalability.com notes that Tumblr is using 15 Varnish servers as part of its server fleet. Besides proxying, they’re being used to serve up public blogs. We (UNIXy) have found that using Varnish can not only help high traffic portals scale out but can also cut down on their server footprint (and bills). In fact, we so believe this is possible we can slash your server hosting bills by at least 30% !
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