Go-Kubernetes-CRD自定义资源开发从零实现Operator模式
Go-Kubernetes-CRD自定义资源开发从零实现Operator模式文章导语Kubernetes Operator模式是云原生运维的最佳实践。通过CRD自定义资源Controller控制器将运维知识编码为自动化程序。本文基于Kubebuilder从零实现一个Go Operator。一、Kubebuilder项目初始化kubebuilder init--domainmycompany.com--repogithub.com/mycompany/myoperator kubebuilder create api--groupapps--versionv1--kindMyApp二、CRD定义typeMyAppSpecstruct{Replicas*int32json:replicasImagestringjson:imageResources corev1.ResourceRequirementsjson:resources,omitempty}typeMyAppStatusstruct{AvailableReplicasint32json:availableReplicasPhasestringjson:phase}三、Reconcile逻辑func(r*MyAppReconciler)Reconcile(ctx context.Context,req ctrl.Request)(ctrl.Result,error){varmyApp appsv1.MyAppiferr:r.Get(ctx,req.NamespacedName,myApp);err!nil{returnctrl.Result{},client.IgnoreNotFound(err)}// 期望状态 vs 实际状态deployment:r.desiredDeployment(myApp)// 创建或更新Deploymentreturnctrl.Result{RequeueAfter:30*time.Second},nil}四、全文总结CRD扩展K8s API定义领域资源Controller持续调和期望状态和实际状态Kubebuilder提供代码生成和脚手架Operator实现运维自动化参考文献Kubebuilder: https://github.com/kubernetes-sigs/kubebuilderK8s Operator模式文档CoreOS Operator Framework
