Runbooks: Operational Documentation for Engineers and Teams
A runbook is a documented procedure for a specific operational task — typically responding to an alert, performing a routine maintenance operation, or executing a complex deployment. Good runbooks reduce errors, enable oncall engineers to respond to unfamiliar systems, and preserve institutional knowledge.
What Makes a Good Runbook
- Clear trigger: When should this runbook be used? What alert or scenario triggers it?
- Step-by-step instructions: Specific commands, not vague descriptions. Engineers under pressure should not need to improvise.
- Decision points: Where the procedure branches based on what you observe — clear criteria for each branch
- Expected outcomes: What should you see at each step if things are working correctly?
- Escalation: When to escalate, and to whom
- Recovery steps: How to reverse the procedure if it goes wrong
Types of Runbooks
- Alert runbooks: Linked from monitoring alerts — "when you receive alert X, follow this procedure"
- Incident runbooks: Standard procedures for common incident types (database failover, certificate expiry, high memory)
- Operational runbooks: Routine tasks — adding a new feature flag, rotating a secret, resizing a database
- Deployment runbooks: Manual steps required during complex deployments
Automation Over Documentation
The best runbook is an automated script — a task that is fully automated doesn't require a runbook at all. We use runbooks as a first step toward automation — documenting the procedure before automating it. When a runbook is executed frequently, it is a candidate for automation.