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Controllers in Kubernetes are implemented through a pattern that reconciles entities towards their desired state. This pattern can actually be extended to cover a large set of use cases, beyond the scope of Kubernetes, while still relying on Kubernetes libraries such as controller-runtime. Come learn how Elastic is building a large-scale multi-cloud multi-region platform on top of Kubernetes, and what design decisions it led to. In this presentation we’ll describe an architecture made of hundreds of Kubernetes clusters, and talk about the challenges we have faced along the way. For example, by going into some details about how some of our controllers don’t actually work with etcd and the apiserver as their backend. They use a different datastore, and reconcile resources in different clusters than the one they are deployed into. We’ll also describe how some CNCF tools help achieve that scale (ArgoCD, Crossplane, Helm, Backstage, cert-manager, etc.).
Sébastien is a backend software engineer at Elastic. In the past few years he has focused on designing and building the platform backing Elastic Cloud, a large scale multi-cloud multi-region platform based on Kubernetes to deploy the Elastic stack and Elastic solutions.
