How to Survive an AWS Zone Outage

Cloud services like AWS, Azure, and GCP facilitate rapid software deployment and are often more cost-effective than self-hosted data centers, yet they require special considerations for resilience. AWS provides concepts like Regions and Availability Zones (AZs) that are crucial for building highly available applications, as they consist of discrete data centers with independent power, network, and connectivity, offering protection from physical disasters. An experiment using steadybit demonstrated how distributing applications across multiple AZs can ensure service continuity even if one zone fails, by simulating an outage and confirming that Kubernetes rerouted requests successfully to functional nodes. The importance of formulating hypotheses and validating the steady state of applications through state checks was emphasized, suggesting further experimentation to enhance service availability and resilience in AWS environments.