operator.md

Operator 用法详解

Mac 安装 operator-sdk

curl -LO https://github.com/operator-framework/operator-sdk/releases/download/v1.21.0/operator-sdk_darwin_amd64
chmod +x operator-sdk_darwin_amd64
sudo cp operator-sdk_darwin_amd64 /usr/local/go/bin/operator-sdk

or

brew install operator-sdk

文档

• 官方文档
• Example

版本要求

• golang 1.17
• operator-sdk v1.21.0

初始化 operator 项目

mkdir podset-operator
cd podset-operator
operator-sdk init --domain pixiu.io --repo github.com/caoyingjunz/podset-operator

创建 API 和 controller

# Create a PodSet API with Group: pixiu, Version: v1beta1 and Kind: PodSet
operator-sdk create api --group pixiu --version v1alpha1 --kind PodSet --resource --controller

创建 Webhook

operator-sdk create webhook --group pixiu --version v1alpha1 --kind PodSet --defaulting --programmatic-validation

生成 CRD, 生成 yaml 存放在 config/crd/bases

make manifests

自定义控制器代码

// Reconcile is part of the main kubernetes reconciliation loop which aims to
// move the current state of the cluster closer to the desired state.
func (r *PodSetReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
	log := r.Log.WithValues("request", req)
	log.Info("reconciling operator")

	podSet := &pixiuv1alpha1.PodSet{}
	if err := r.Get(ctx, req.NamespacedName, podSet); err != nil {
		if apierrors.IsNotFound(err) {
			// Req object not found, Created objects are automatically garbage collected.
			// For additional cleanup logic use finalizers.
			// Return and don't requeue
			return reconcile.Result{}, nil
		} else {
			log.Error(err, "error requesting pod set operator")
			// Error reading the object - requeue the request.
			return reconcile.Result{Requeue: true}, nil
		}
	}
    ...

Build and push image

docker build -f Dockerfile . -t jacky06/podset-operator:v0.0.1
docker push jacky06/podset-operator:v0.0.1

部署 PodSet CRD

CRD 来自 podset-operator