Operator SDK

operator-sdk是operator framework的一部分，是一个致力于简化整个opearator creation的整个过程的一个社区项目。有了operator-sdk，我们只需要在control loop里面写定制的operational逻辑就可以了。

三种operator SDK supports:

类型	生成的objects	你需要做
Go Operator	General go program structure Boilerplate code to talk to the Kubernetes API Boilerplate code to watch for Kubernetes objects of interest An entry point to the reconciliation loop An example YAML files based on CRDs	Custom objects via CRDs Control loop logic in Go Potentially artistic stunts only possible by talking directly to the API from Go
Ansible Operator	A Go program that runs an Ansible playbook or role every time a certain type of object is detected / modified	Ansible playbook or role Custom objects via CRD
Helm Operator	A custom object via CRD containing the same properties as the chart's values.yaml A Go program that reads a helm chart and deploys all its resources Watch statements to detect changes in the custom objects specification, re-deploying all resources with updated values	The location / repository of the helm chart

其中， go和ansible operator已经非常成熟了，可以支持所有的操作，但是helm operator还不成熟，只能支持简单的安装和升级。