SRE

Site Reliability Engineering (SRE) is the team responsible for developing and maintaining Wikimedia's production infrastructure. Previously known as Technical Operations, they are in charge of making sure all Wikimedia's sites and services used by the general public (including MediaWiki and all associated services) run reliably, securely, and with high performance.

• If you need help from SRE and it is an emergency, you can page us via https://klaxon.wikimedia.org.
• If it is not an emergency, but do not know which team is responsible for your question, just open a generic task on Phabricator in the SRE project and our Clinic Duty engineer of the week will route it. If it more urgent or just a quick check you can find us on IRC: #wikimedia-sre ^connect.

The Foundation has a number of sub-teams within SRE, each responsible for different areas:

SRE Data Center Operations

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SRE Data Center Operations - all things related to Data Centers, hardware maintenance and purchases. The Data Center Operations team is responsible for all of Wikimedia’s data center deployments and logistics as well as maintaining our presence in locations across the world. They perform on-site work and maintain the full 5-year life cycle (specs, purchasing, physical install, break/fix and decommissioning) for all hardware. #wikimedia-dcops connect

SRE Data Persistence

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SRE Data Persistence - Databases and Object storage (MariaDB and Swift). The Data Persistence team focuses on Wikimedia’s persistent data storage and retrieval systems, including (No)SQL databases, (distributed) object storage, file storage and backup systems. #wikimedia-databases connect

SRE Infrastructure Foundations

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SRE Infrastructure Foundations - Automation and Networking (cumin, netbox, puppet, spicerack). The team focuses on building and maintaining our base platform (“metal cloud”) that forms the foundations upon which nearly everything else in our infrastructure builds upon. On top of our bare metal deployments, their responsibilities include (but are not limited to) configuration management systems, infrastructure automation, orchestration tooling, infrastructure security and network operations. #wikimedia-sre-foundations connect

SRE Observability

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SRE Observability - Monitoring and Logging (Prometheus/Grafana and ElasticSearch, plus some Kafka). The Observability team, or "o11y" for short, works across SRE and Technology to provide teams with tools, platforms and insights into how systems and services are performing. It leverages technologies such as Grafana, Kibana/Logstash, Prometheus, AlertManager and more. #wikimedia-observability connect

SRE Service Operations

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SRE Service Operations - MediaWiki Operations and Supporting Services (Kubernetes, memcached, redis, Infrastructure for: Gitlab, OTRS, Phabricator). The Service Operations team takes care of public and “user-visible” services alongside Technology and Product teams. This means, for example, our MediaWiki platform, but also the newer (micro)services that comprise our stack. It also includes miscellaneous services and components that we rely upon (think Phabricator, mail systems, OTRS, etc…). The team is also building our new SOA service infrastructure based on Kubernetes. #wikimedia-serviceops connect

SRE Traffic

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SRE Traffic - Caching and DNS (ATS, varnish, GeoDNS, wikidough). The Traffic team is responsible for the critical first layer of high-traffic infrastructure which now spans much of the globe, including our TLS termination and caching layers (ATS, Varnish), load balancing, DNS and our own network. #wikimedia-traffic connect

Check SRE Team Requests to see most how to see most common types of requests.

References:

• How complex systems fail This is where SRE works
• Google's SRE books Google formalized many of the concepts and coined the term SRE