Varnish Varnish is a high-performance HTTP accelerator.
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Varnish Description

Varnish is a high-performance HTTP accelerator. Varnish is a high-performance HTTP accelerator designed for sites with large amounts of non-personalized dynamic content, such as online newspapers. Here are some key features of "Varnish": Pure HTTP accelerator: · Varnish will deliver cached documents received from your backend(s), and do this fast Very fast: · Varnish is buildt for speed, and should out-perform any other Open Source HTTP accelerator. Multiprocessor/core support: · Buildt with the future in mind, Varnish supports modern hardware technology. 64-bit computing support: · While it can run on a 32-bit platform, Varnish was buildt with 64-bit computing in mind. Modern operatingsystem technology: · To be able to deliver content as efficient as possible Varnish takes in use the latest operatingsystem features like Kqueue/Epoll and Sendfile. Varnish is also IPv6 compatible. Powerful configuration possibilities: · Varnish has a powerful configurationlanguage (VCL) which gives you endless possibilities and power over your content. Runtime configuration deployment: · Changing of configurationfiles are done in runtime, no need to stop/ restart your service(s). Protection of backend(s): · Varnish is easily configured to not just stand around and see your backend(s) die if you are getting flooded with unwanted traffic. Give crawlers the content you feel they deserve. If your backend(s) should experience planned or unplanned downtime configure Varnish to never expire or fetch new content. Ease of managment: · Your Varnish server(s) can be centrally controlled from a managment program for quick deployment of changes to your system. Different interfaces are available for those that don't like the commandline. Central and flexible logging: · Logs are written to shared-memory, so logging is cheap. A centrally controlled logger program connects to the servers and collects these data so you can easily customize what, and how, you wanna logg to either display or file. This is done securely. Realtime statistics: · As with logging, we provide you with a centrally controlled statistics collector to aggregate numbers from each server or present them individially. Again this is done in a securely manner. Instant wildcard purging of documents: · Varnish will instantly stop delivery of any cached documents matching any regualar expression you give it, without wasting time traversing any structure or cached document. Plugable storage backend(s): · We give you memory, file or tar-file (Read-Only) backend out of the box, if you wanna store/read from another backend we leave you with an API. What's New in This Release: · Serve graced objects if the backend is unhealthy. · Portability fixes for Solaris, MacOS X/Darwin and NetBSD · Documentation updates · Added server.hostname and server.identity to VCL. · Fixed a problem where we would sleep for far too long when we would run out of file descriptors. · Add support for processing binary objects with ESI.

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