Cameron Tuckerman-Lee / DevOpsDays Shanghai / 2017-08-18 SRE at Airbnb
Cameron Tuckerman-Lee Airbnb Site Reliability Engineer
SRE at Airbnb How do you combine the culture and spirit of DevOps with an operations team? DevOps & SRE SRE Organization Future of Ops
SRE at Airbnb DevOps & SRE How is SRE at Airbnb organized? Cloud Infra and Reliability deep-dive. SRE Organization Future of Ops
SRE at Airbnb DevOps & SRE SRE Organization Operators should grow, learn, and be recognized for oncall work, while maintaining pagerlife balance. Future of Ops
Centralized Ops Centralized Operations Organization Positives Reliability can be easily prioritized Specialization of roles Negatives Operators unfamiliar with code base Tension between operations and development
Centralized Ops Distributed Ops Distributed Operations Positives Agility can be easily prioritized Developers are incentivized to build systems that are easy to operate (since they are the operators!) Negatives Lack of specialization --- devs are forced to relearn difficult lessons over-andover Teams speak different uptime/reliability languages to each other
Centralized Ops Distributed Ops Hybrid Approach Hybrid Approach: Two Pizza Teams + SRE Team Able to 'tune' a balance between reliability and agility Developers are still expected to run normal operations for their services == build operable services Centralized operations organization can build reusable tools to make operations / incident response easier. Specialization of roles without tension between operations and development teams. Organization that understand and recognizes the value in automating away their job.
“ Fundamentally, it's what happens when you ask a software engineer to design an operations function... Ben Treynor VP Engineering, Google
What makes up SRE at Airbnb? Site Reliability Engineering is made up of three components: Cloud Infrastructure Manages our touch points with AWS and other cloud partners Core Reliability Develops tools and processes to improve operations, reliability, and incident response for all teams Embedded Reliability Temporary embedding of SREs in product teams to work on specific reliability or availability focused projects
Requirements for Each Integration Monitoring Alerting Security Approval Auditing Version Upgrades Access Control ...
Three Pillars of Reliability Uptime Measurement Every team at any time should be able to confidently say whether their service is working properly or not. Alerting & Detection Defense-in-depth: our users are protected from bugs and regressions by multiple layers of opinionated alerts. Incident Response Engineers can coordinate across teams, investigate problems in systems they don't fully understand, and keep stakeholders up-to-date.
1. Uptime Identify quantifiable metrics which are related to the health of their services, called (Service Level Indicators or SLI) Make public and easily discoverable promises about the behavior of your service using your SLIs (Service Level Objectives or SLO) Teams review their services current SLIs and compare them to their published SLOs to make tradeoffs between reliability improvements and new features --- SLOs encode the tradeoff between moving fast and breaking things (Error budgets)
1. Uptime 2. Alerting Alerting philosophy should be opinionated --- engineers know what kind of alerts to write and when to write them Alerts (like configuration) should be code Practice defense in depth --- protect your users from bugs and regressions with layers of alerts like a security team protects employees from being compromised with layers of defenses
1. Uptime 2. Alerting 3. Response Incident Reporter Tool Mid-Incident Engineers can effectively coordinate, even across teams Stakeholders (upstream clients, management, employees) are kept aware of updates Working on a Slack integration so responders can stay in chat but keep the company up-to-date Post-Incident Blameless postmortem process Consistent impact measurement (management sees that better incident response + corrective actions matters to the bottom line) Easily search past incidents/postmortems
Future of Ops People-First On-call Pager-Life Balance: Ensure that more involved, tenured engineers aren’t always the ones waking up at 3 AM to put out fires Learning/Growth Focused: Continuing education and learning opportunities for on-call engineers Evaluation Metrics: Engineers should know where they can improve and should be recognized for excellent work Intelligent Scheduling: In DevOps when every team has at least two on-call rotations, how can we schedule around lives outside of work (and responsibilities inside of work)?
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