operator-sdk升级

operator sdk v0.x和v1.x的区别

operator sdk和kubebuilder整合后（以kubebuilder为主），operator sdk发布了v1.x版本，operator sdk的项目layout、scaffold、dependency、 usage、code等发生了变化

1. 底层相似：under the hood using controller-runtime、controller-tools to adding a manager, api scheme and creates an structs implements a reconciler interface
2. 整合项目：https://github.com/kubernetes-sigs/kubebuilder/projects/7， 2019年7月25日开始，2020年11月7日关闭了
3. 未来规划：operator-sdk commit参与kubebuilder的开发维护；文档会将基于go的operator文档集成到kubebuilder文档，未来共同维护kubebuilder文档的更新

	operator-sdk	kubebuilder
project	part of operator-framework，coreos开发维护	one of the kubernetes-sigs
commits	most are google, redhat	most are redhat
integration	The operator-sdk has better integration with helm, and having better integration with the operator-framework ecosystem	the kuebuilder integrates with existing kubernetes-sigs projects

版本主要变化

主要参考链接：https://sdk.operatorframework.io/docs/building-operators/golang/migration/

1. new layout：operator-sdk在向kubebuilder的layout靠拢
2. scaffold：新增kustomize、kube-auth-proxy、envtest等
3. dependency
   1. kubebuilder go CLI v2 to v3(operator-sdk v1.2对应kubebuilder v2； operator-sdk v1.4对应kubebuilder v3)
      1. The minimum Go version is now 1.15
      2. controller-runtime to v0.8.0（https://master.book.kubebuilder.io/migration/v2vsv3.html
      3. controller-tools to v0.4.1
      4. 新增：因为operator metrics需要kustomize ，Support for kustomize v3.8.7
   2. operator-lib v0.4.0 ，because of controller-runtime v0.8.0
   3. kubernetes：最高支持版本v1.19，低版本也支持（https://github.com/operator-framework/operator-sdk/releases/tag/v1.3.0）
4. command
   1. operator-sdk generate crds is replaced with make manifests, which generates CRDs and RBAC rules.
   2. operator-sdk build is replaced with make docker-build IMG=/:tag
   3. …等
5. code：func、interface等发生变化