1. 安装kubebuilder

brew install kubebuilder

2. 需求描述

开发一个zk operator。

cr定义为ZooKeeperCluster

3. 开发过程

3.1 创建一个空的文件夹zk-operator

mkdir zk-operator

3.2 进入该文件夹

cd zk-operator

3.3 执行初始化

kubebuilder init --domain my.domain --repo my.domain

3.4 创建API

kubebuilder create api --group webapp --version v1 --kind ZooKeeperCluster

3.5 修改zk 类字段

type ZooKeeperClusterSpec struct {// INSERT ADDITIONAL SPEC FIELDS - desired state of cluster// Important: Run "make" to regenerate code after modifying this file// Foo is an example field of ZooKeeperCluster. Edit zookeepercluster_types.go to remove/updateFoo      string `json:"foo,omitempty"`Replicas *int32 `json:"replicas,omitempty"`Image    string `json:"image,omitempty"`Version  string `json:"version,omitempty"`
}

3.5 生成crd等文件

cd zk-operatormake manifests

3.6 在main函数中设置kubeconfig文件路径

	kubeconfig := "/Users/liyinlong/env/88.conf"//if os.Getenv("KUBECONFIG") != "" {//	kubeconfig = os.Getenv("KUBECONFIG")//}config, err := clientcmd.BuildConfigFromFlags("", kubeconfig)if err != nil {log.Fatalf("Error building kubeconfig: %s", err.Error())}mgr, err := ctrl.NewManager(config, ctrl.Options{Scheme: scheme,Metrics: metricsserver.Options{BindAddress:   metricsAddr,SecureServing: secureMetrics,TLSOpts:       tlsOpts,},WebhookServer:          webhookServer,HealthProbeBindAddress: probeAddr,LeaderElection:         enableLeaderElection,LeaderElectionID:       "1c8adf6b.my.domain",// LeaderElectionReleaseOnCancel defines if the leader should step down voluntarily// when the Manager ends. This requires the binary to immediately end when the// Manager is stopped, otherwise, this setting is unsafe. Setting this significantly// speeds up voluntary leader transitions as the new leader don't have to wait// LeaseDuration time first.//// In the default scaffold provided, the program ends immediately after// the manager stops, so would be fine to enable this option. However,// if you are doing or is intended to do any operation such as perform cleanups// after the manager stops then its usage might be unsafe.// LeaderElectionReleaseOnCancel: true,})

3.7 创建一个zk cr

apiVersion: webapp.my.domain/v1
kind: ZooKeeperCluster
metadata:labels:zk: myzkname: myzk1
spec:foo: lylreplicas: 2image: zookeeperversion: 3.4.1

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