Stateless web tier that survives an AZ outage
Easy
Resilient Architectures
Task 2.2: Design highly available and/or fault-tolerant architectures
QuestionWatch the method
Predict first. Then watch short phrases—not full sentences—drive the decision.
Scenario
Halide Health runs a stateless internal portal on one m5.large EC2 instance in eu-central-1a.
When that Availability Zone lost power in March, the portal was dark for four hours while an engineer rebuilt it by hand from the release AMI.
The platform lead wants the next outage absorbed by the platform: capacity must survive the loss of one Availability Zone, and a failed instance must be replaced with no page.
Question
Which design keeps the portal serving through the loss of one Availability Zone with no operator action?
Model → Coach → Solo·Model · step 1 of 5 · not started
Activity timeline · 1 events
- 01coach · Make a prediction, record your confidence, then watch the reasoning method.