SRE/Traffic/Ownership
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Presently, all Phabricator tasks of the Traffic team use one all-encompassing tag (traffic) rather than any granular, per-component tags.
| Service | Description |
|---|---|
| Acme-chief | Centrally request configured TLS certificates from ACME servers, then make the public and private parts available to authorized API users. |
| 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.. |
| HAProxy | TLS and HTTP/2 termination at the CDN |
| DNS | Wikimedia uses 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) |
| LVS | A high-traffic Layer 4 load balancer. |
| Ncredir | Non-Canonical Redirect service (e.g. wikipedia.com to wikipedia.org) |
| Purged | Daemon that reads Kafka purge messages, parses them, and turns them into HTTP purge requests for ATS and Varnish |
| PyBal | Automated manager for LVS |
| Varnish | A caching HTTP proxy used as the frontend (in-memory) component of Wikimedia's CDN. |