add operator-framework sdk
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- [单元测试和集成测试](develop/testing.md)
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- [client-go示例](develop/client-go-sample.md)
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- [Operator](develop/operator.md)
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- [operator-sdk](develop/operator-sdk.md)
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- [高级开发指南](develop/advance-developer.md)
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- [社区贡献](develop/contribute.md)
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- [Minikube](develop/minikube.md)
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# Operator SDK
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[Operator SDK](https://github.com/operator-framework/operator-sdk) 由 CoreOS 开源,它是用于构建 Kubernetes 原生应用的 SDK,它提供更高级别的 API、抽象和项目脚手架。在阅读本文前请先确认您已经了解 [Operator](operator.md)是什么。
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使用 Kubernetes 中原生的对象来部署和管理复杂的应用程序不是那么容易,尤其是要管理整个应用的生命周期、组件的扩缩容,我们之前通常是编写各种脚本,通过调用 Kubernetes 的命令行工具来管理 Kubernetes 上的应用。现在可以通过 CRD(CustomResourceDefinition)来自定义这些复杂操作,通过将运维的知识封装在自定义 API 里来减轻运维人员的负担。同时我们还可以像操作 Kubernetes 的原生资源对象一样,使用 `kubectl` 来操作 CRD。
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下面我们将安装和试用一下 Operator SDK。
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## 安装 Operator SDK
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```bash
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$ mkdir -p $GOPATH/src/github.com/operator-framework
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$ cd $GOPATH/src/github.com/operator-framework/operator-sdk
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$ dep ensure
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Create kubernetes-operator-sdk-tutorial/cmd/kubernetes-operator-sdk-tutorial/main.go
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Create kubernetes-operator-sdk-tutorial/config/config.yaml
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Create kubernetes-operator-sdk-tutorial/deploy/rbac.yaml
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Create kubernetes-operator-sdk-tutorial/deploy/cr.yaml
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Create kubernetes-operator-sdk-tutorial/pkg/apis/jimmysong/v1alpha1/doc.go
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Create kubernetes-operator-sdk-tutorial/pkg/apis/jimmysong/v1alpha1/register.go
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Create kubernetes-operator-sdk-tutorial/pkg/apis/jimmysong/v1alpha1/types.go
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Create kubernetes-operator-sdk-tutorial/pkg/stub/handler.go
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Create kubernetes-operator-sdk-tutorial/tmp/build/build.sh
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Create kubernetes-operator-sdk-tutorial/tmp/build/docker_build.sh
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Create kubernetes-operator-sdk-tutorial/tmp/build/Dockerfile
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Create kubernetes-operator-sdk-tutorial/tmp/codegen/boilerplate.go.txt
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Create kubernetes-operator-sdk-tutorial/tmp/codegen/update-generated.sh
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Create kubernetes-operator-sdk-tutorial/Gopkg.toml
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Create kubernetes-operator-sdk-tutorial/Gopkg.lock
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Run dep ensure ...
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Root project is "github.com/rootsongjc/kubernetes-operator-sdk-tutorial"
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3 transitively valid internal packages
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12 external packages imported from 4 projects
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(0) ✓ select (root)
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(1) ? attempt k8s.io/api with 1 pkgs; at least 1 versions to try
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(1) try k8s.io/api@kubernetes-1.9.3
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(1) ✓ select k8s.io/api@kubernetes-1.9.3 w/1 pkgs
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(2) ? attempt k8s.io/apimachinery with 4 pkgs; at least 1 versions to try
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(2) try k8s.io/apimachinery@kubernetes-1.9.3
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(2) ✓ select k8s.io/apimachinery@kubernetes-1.9.3 w/22 pkgs
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...
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$ go install github.com/operator-framework/operator-sdk/commands/operator-sdk
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```
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该过程需要几分钟,请耐心等待。确认 `$GOPATH/bin/operator-sdk` 文件位于您的 `$PATH` 目录下。
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## 创建项目
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```bash
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$ cd $GOPATH/src/github.com/<your-github-repo>/
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$ operator-sdk new <operator-project-name> --api-version=<your-api-group>/<version> --kind=<custom-resource-kind>
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$ cd <operator-project-name>
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```
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- operator-project-name:创建的项目的名称
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- your-api-group:Kubernetes 自定义 API 的组名,一般用域名如 `jimmysong.io`
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- version:Kubernetes 自定义资源的 API 版本
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- custom-resource-kind:CRD 的名称
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```bash
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operator-sdk new kubernetes-operator-sdk-tutorial --api-version=jimmysong.io/v1alpha1 --kind=operator-sdk
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```
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## 参考
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- [A complete guide to Kubernetes Operator SDK](https://banzaicloud.com/blog/operator-sdk/)
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