KubeCon + CloudNativeCon North America 2024

Many Kubernetes installations use controllers that include Custom Resource Definitions (CRDs) to extend their capabilities. However, because CRDs can only have one version installed in a cluster at any one time, version and change management can be very difficult. This talk will benefit both controller implementers and users. For implementers, I have tips on how to more safely make API changes to their CRDs, and for CRD users, some tips on what to look out for when installing CRD updates. All of this is based on using experience from projects like Contour, Gateway API, and Cilium among others. Learn things like: Different CRD version management strategies - what’s worked and what hasn’t How to make schema changes like pluralizing a field or changing field validation in a safe way How not to make the same mistakes I did Expect to come away from this talk having learned from my painful experiences handling CRD changes badly, but also having heard a bunch of Simpsons references.