Chaos engineering -- test failure before it happens

Systems fail in production in ways nobody predicted. Disaster recovery plans are never tested. Teams only learn about failure modes during actual outages.

Deliberately inject failures in controlled conditions: (1) Kill random instances (Chaos Monkey). (2) Introduce network latency. (3) Fill disk space. (4) Revoke database credentials. (5) Simulate region failure. Start small: kill one pod and verify recovery. Increase scope gradually. Prerequisites: good monitoring, automated recovery, runbooks. Tools: Chaos Monkey, Litmus Chaos, Gremlin, toxiproxy for network simulation.

If you have not tested a failure mode, you do not know if your system can handle it. Chaos engineering trades a small controlled risk for knowledge that prevents large uncontrolled outages.