Glossary term
What is blast radius? Meaning for developers
In DevOps
How much can be damaged when one credential, server or change goes wrong. Good design keeps it small.
Learn it properly · DevOpsLesson 18: Security Hardening and BackupsLocking down what you built: patching, secrets, least privilege, automated backups and tested restores.In System Design
How much is affected by one failure. Example: A bad deploy in one "cell" affects only that cell's users.
Learn it properly · System DesignLesson 40: Single Points of Failure, Redundancy & FailoverThe site went down, and the culprit was none of the redundant boxes on the diagram but the one NAT gateway, the one DNS provider, or an expired certificate. How to hunt single points of failure, shrink blast radius, add redundancy that works, and fail over without split brain.