Declarative systems, like Kubernetes [1] are nice. Instead of forming the state of the system command-by-command, one just posts a set of declarative requirements. The system will try to adapt. While it easy to understand how to use such a system from the user perspective, it requires a complete rethinking for us engineers on how to integrate with such a system. Based on the experiences with extending Kubernetes for KubeVirt [2] with the Kubernetes-Go-SDK [3], this session gives a short and concise overview on what is required to implement declarative flows in general and particularly in Kubernetes. Real-world examples and pitfalls included.

[1] https://kubernetes.io/ [2] https://github.com/kubevirt/kubevirt [3] https://github.com/kubernetes/client-go