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Service Category Description Phabricator tag Notes
Varnish A caching HTTP proxy used as the frontend (in-memory) component of Wikimedia's CDN.
Apache Traffic Server aka ATS, is a caching HTTP proxy used as the backend (on-disk) component of Wikimedia's CDN. In-memory, ephemeral caching is done by cache frontends running Varnish..
DNS Wikimedia use two separate kinds of The DNS servers, authoritative nameservers (that respond to queries from third party nameservers for our domains) and recursive resolvers (that resolve DNS queries when any of our servers need to look up a name)