Editing Squid

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'''Squid''' is a free, open source proxy cache server for web content.

[[Wikimedia]] uses, and [[MediaWiki]] developers recommend, the use of Squid caching proxy servers between the MediaWiki web server farms and the internet at MediaWiki sites as request/hit rates rise to the 100-200 per second range and the server farm reaches two to three machines. At Wikimedia the Squids typically serve about 75% of all hits and largely isolate the rest of the server farm from the effect of  high profile events like [[en:Slashdotting|Slashdotting]]. This reduces the load on both the [[mw:PHP configuration|PHP]]/web computers and the database server.

For non-Wikimedia situations, Squids are likely to be the best next step after moving from one server to a database server and two [[mw:Apache configuration|Apache]] web servers, perhaps going with a Squid instead of the second Apache.

For more information see:
*[[Cache strategy]], a description of the MediaWiki cache strategy used by the Wikimedia hosted sites such as Wikipedia.
*Encyclopedia article about Squid in [[En:Squid cache|English]], [[de:Squid|German]], [[fr:Squid|French]], [[pl:Squid|Polish]].
*The [http://www.squid-cache.org/ Squid web site].
*[[Wikimedia servers]], an overview of the Wikimedia server farm.