At my current employer, we use Kubernetes to run hundreds of thousands of bare metal servers, spread over hundreds of Kubernetes clusters. We use Kubernetes beyond officially supported/tested scale limits by running more than 5,000 nodes and over a hundred thousand of pods in a single cluster.1 In these large scale setups, expensive “list” calls on the Kubernetes API are the achilles heel of the control plane reliability and scalability. In this article, I’ll explain which list call patterns pose the most risk, and how recent and upcoming Kubernetes versions are improving the list API performance.
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