Multi-AZ design
On This Lesson 4 topics
This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.
In this lesson
design for zone failure inside a region.
Planned topics
- Run application instances in at least two or three zones behind a load balancer with health checks.
- Make services stateless so any instance can serve any request.
- Use managed data services with multi-AZ standby; state lives there.
- Size so that losing one zone still leaves enough capacity.
- Remove single points of failure: one NAT, one queue consumer, one VPN tunnel.
Draft outline details
Demonstration
a diagram: three zones, each with application instances and data nodes, load balancer spanning them; one zone shaded as failed.
Check your understanding
Why size for the loss of one zone?
Show answer
Otherwise the remaining zones are overloaded when one fails.
Practice
Apply this lesson with the module's lab, exercises and quiz.
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