Conference:  KubeCon + CloudNativeCon North America 2022

Authors: Joe Betz

2022-10-27

In Kubernetes 1.23 we integrated the CEL expression language into open source Kubernetes, making it possible to support the vast majority of CRD validation use cases without a webhook. This includes multi-field validation rules, immutability checks and more.  And this is just the beginning, we plan to extend admission control to support CEL expressions as well, which will make it possible to replace far more of those operationally troublesome webhooks with a much simpler alternative. We're convinced this leads to a better development experience for anyone extending Kubernetes. And more importantly, it makes cluster operations simpler and safer.  Learn about this future of Kubernetes extensibility from a contributor who has been involved in Kubernetes extensibility for over 5 years, including the projects to bring CRDs and Webhooks to GA, and who has been involved in improving the stability of Kubnernetes control planes in GKE for years.  In this talk I'll introduce CEL and how we've integrated it into Kuberentes and answer questions including: What can you do with CEL in Kubernetes today? What future features are planned? Can there really a future where webhooks are the exception instead of the norm?