Learn/Runbook
PROCESSES

Runbook

A step-by-step guide for handling specific operational tasks or incidents.

Runbook

A step-by-step guide for handling specific operational tasks or incidents.

## The "Checklist" A **Runbook** is a recipe. It assumes the reader is smart but stressed. It focuses on **Action**. ### Elements of a Good Runbook 1. **Triggers**: "Use this when Alert X fires." 2. **Impact**: "This issue causes 500 errors on checkout." 3. **Steps**: * 1. Check Dashboard Y. * 2. If CPU > 90%, run command Z. * 3. If not, escalate to Database Team. 4. **Verification**: "How do I know it's fixed?" ### Runbook vs. Documentation * **Docs**: "Here is how the system works." (Read this on Tuesday morning). * **Runbook**: "Here is how to fix the system." (Read this at 3 AM on Saturday).

ExThe "Restart" Runbook

"A complex microservice required a specific restart order (DB -> Cache -> App)."

Impact
Engineers often guessed the order, corrupting data.
Resolution
A simple checklist runbook was created: "Step 1: Stop App. Step 2: Flush Cache. Step 3: Restart DB." Incidents became trivial.

Why Runbook Matters

Runbooks reduce cognitive load during incidents. Follow the steps instead of figuring it out live.

Good runbooks enable on-call success and faster incident resolution.

Common Pitfalls

Outdated Info
Runbooks must be "living" documents. If a runbook fails, update it immediately.
Assuming Knowledge
Detailed "ssh" commands. Don't write "Connect to the server". Write "ssh user@10.0.0.1".

How to Use Runbook

โœ๏ธ
Keep Simple: Checklists work better than essays.
๐Ÿ”„
Update Often: Stale runbooks are worse than none.
๐Ÿงช
Test During Game Days: Verify runbooks actually work.

Frequently Asked Questions

How long should a runbook be?
Short. If it is longer than 1 page, no one will read it during an outage.
What if we can automate the runbook?
Do it! An executable script is the ultimate runbook. "Run `fix_db.sh`" is the best ongoing maintenance.

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