# What running Kubernetes across millions of clusters taught AWS about zonal failures

DevFeed: [What running Kubernetes across millions of clusters taught AWS about zonal failures](<https://devfeed.tech/articles/what-running-kubernetes-across-millions-of-clusters-taught-aws-about-zonal-failures-17623.md>)

Original publisher: [Read original article](<https://thenewstack.io/eks-zonal-shift-resilience/>)

Author: Raghav Tripathi

Published: 2026-07-10T15:00:00Z

Content type: article

Language: en

Sources: [Kubernetes Overview, News and Trends | The New Stack](<https://devfeed.tech/sources/kubernetes-overview-news-and-trends-the-new-stack.md>)

Topics: [Amazon EKS](<https://devfeed.tech/topics/amazon-eks.md>), [Kubernetes](<https://devfeed.tech/topics/kubernetes.md>), [Amazon Web Services](<https://devfeed.tech/topics/aws.md>), [Resilience](<https://devfeed.tech/topics/resilience.md>), [Availability](<https://devfeed.tech/topics/availability.md>)

Tags: [amazon-eks](<https://devfeed.tech/tags/amazon-eks.md>), [api](<https://devfeed.tech/tags/api.md>), [availability](<https://devfeed.tech/tags/availability.md>), [aws](<https://devfeed.tech/tags/aws.md>), [aws-marketplace](<https://devfeed.tech/tags/aws-marketplace.md>), [cloud-services](<https://devfeed.tech/tags/cloud-services.md>), [health-checks](<https://devfeed.tech/tags/health-checks.md>), [kubectl](<https://devfeed.tech/tags/kubectl.md>), [kubernetes](<https://devfeed.tech/tags/kubernetes.md>), [networking](<https://devfeed.tech/tags/networking.md>), [operations](<https://devfeed.tech/tags/operations.md>), [outage](<https://devfeed.tech/tags/outage.md>), [post-contributed](<https://devfeed.tech/tags/post-contributed.md>), [resilience](<https://devfeed.tech/tags/resilience.md>), [sponsor-aws-marketplace](<https://devfeed.tech/tags/sponsor-aws-marketplace.md>), [sponsored-post-contributed](<https://devfeed.tech/tags/sponsored-post-contributed.md>)

## AI overview

AWS describes how years of engineering on Amazon EKS addressed zonal failures, including gray failures where a zone is degraded but still passes some health checks. The approach emphasizes static stability, preserving capacity, and routing around the impaired Availability Zone.

## Source excerpt

Handling the obvious failures is the easy part: a server goes down, you spin up another. The failures that actually The post What running Kubernetes across millions of clusters taught AWS about zonal failures appeared first on The New Stack.