DR Runbook Design: Failover Procedures, Communication Plans, and Decision Trees#

A DR runbook is used during the worst moments of an engineer’s career: systems are down, customers are impacted, leadership is asking for updates, and decisions carry real consequences. The runbook must be clear enough that someone running on adrenaline and three hours of sleep can execute it correctly.

This means: short sentences, numbered steps, explicit commands (copy-paste ready), no ambiguity about who does what, and timing estimates for each phase so the incident commander knows if things are taking too long.

Incident Lifecycle Overview#

An incident is an unplanned disruption to a service requiring coordinated response. The lifecycle has six phases: detection, triage, communication, mitigation, resolution, and review. Each has defined actions, owners, and exit criteria.

Phase 1: Detection#

Incidents are detected through three channels. Automated monitoring is best – alerts fire on SLO violations or error thresholds before users notice. Internal reports come from other teams noticing issues with dependencies. Customer reports are worst case – if users detect your incidents first, your observability has gaps.