add ID the unique identifier for push and pull mode's cluster

Signed-off-by: yy158775 <1584616775@qq.com>

cmd/agent/app/agent.go

@@ -132,6 +132,13 @@ func run(ctx context.Context, karmadaConfig karmadactl.KarmadaConfig, opts *opti
 		ControlPlaneConfig: controlPlaneRestConfig,
 		ClusterConfig:      clusterConfig,
 	}
+
+	id, err := util.ObtainClusterID(clusterKubeClient)
+	if err != nil {
+		return err
+	}
+	registerOption.ClusterID = id
+
 	clusterSecret, impersonatorSecret, err := util.ObtainCredentialsFromMemberCluster(clusterKubeClient, registerOption)
 	if err != nil {
 		return err
@@ -323,6 +330,7 @@ func generateClusterInControllerPlane(opts util.ClusterRegisterOption) (*cluster
 		cluster.Spec.SyncMode = clusterv1alpha1.Pull
 		cluster.Spec.APIEndpoint = opts.ClusterAPIEndpoint
 		cluster.Spec.ProxyURL = opts.ProxyServerAddress
+		cluster.Spec.ID = opts.ClusterID
 		if opts.ClusterProvider != "" {
 			cluster.Spec.Provider = opts.ClusterProvider
 		}

pkg/controllers/cluster/cluster_controller.go

@@ -165,6 +165,18 @@ func (c *Controller) Reconcile(ctx context.Context, req controllerruntime.Reques
 
 // Start starts an asynchronous loop that monitors the status of cluster.
 func (c *Controller) Start(ctx context.Context) error {
+	// starts a goroutine to collect existed clusters' ID for upgrade scenario
+	// And can be removed in next version
+	klog.Infof("Starting collect ID of already existed clusters")
+	go func() {
+		err := c.collectIDForClusterObjectIfNeeded(ctx)
+		if err != nil {
+			klog.Errorf("Error collecting clusters' ID: %v", err)
+		}
+
+		klog.Infof("Finishing collect ID of already existed clusters")
+	}()
+
 	klog.Infof("Starting cluster health monitor")
 	defer klog.Infof("Shutting cluster health monitor")
 
@@ -563,3 +575,44 @@ func (c *Controller) taintClusterByCondition(ctx context.Context, cluster *clust
 
 	return nil
 }
+
+func (c *Controller) collectIDForClusterObjectIfNeeded(ctx context.Context) (err error) {
+	clusterList := &clusterv1alpha1.ClusterList{}
+	if err := c.Client.List(ctx, clusterList); err != nil {
+		return err
+	}
+
+	clusters := clusterList.Items
+	var errs []error
+
+	for i := range clusters {
+		cluster := &clusters[i]
+		if cluster.Spec.ID != "" {
+			continue
+		}
+
+		if cluster.Spec.SyncMode == clusterv1alpha1.Pull {
+			continue
+		}
+
+		clusterClient, err := util.NewClusterClientSet(cluster.Name, c.Client, nil)
+		if err != nil {
+			errs = append(errs, err)
+			continue
+		}
+
+		id, err := util.ObtainClusterID(clusterClient.KubeClient)
+		if err != nil {
+			errs = append(errs, err)
+			continue
+		}
+		cluster.Spec.ID = id
+
+		err = c.Client.Update(ctx, cluster)
+		if err != nil {
+			errs = append(errs, err)
+			continue
+		}
+	}
+	return utilerrors.NewAggregate(errs)
+}

pkg/karmadactl/join.go

@@ -177,6 +177,12 @@ func JoinCluster(controlPlaneRestConfig, clusterConfig *rest.Config, opts Comman
 		ClusterConfig:      clusterConfig,
 	}
 
+	id, err := util.ObtainClusterID(clusterKubeClient)
+	if err != nil {
+		return err
+	}
+	registerOption.ClusterID = id
+
 	clusterSecret, impersonatorSecret, err := util.ObtainCredentialsFromMemberCluster(clusterKubeClient, registerOption)
 	if err != nil {
 		return err
@@ -201,6 +207,7 @@ func generateClusterInControllerPlane(opts util.ClusterRegisterOption) (*cluster
 	clusterObj.Name = opts.ClusterName
 	clusterObj.Spec.SyncMode = clusterv1alpha1.Push
 	clusterObj.Spec.APIEndpoint = opts.ClusterConfig.Host
+	clusterObj.Spec.ID = opts.ClusterID
 	clusterObj.Spec.SecretRef = &clusterv1alpha1.LocalSecretReference{
 		Namespace: opts.Secret.Namespace,
 		Name:      opts.Secret.Name,

pkg/util/cluster.go

@@ -10,6 +10,7 @@ import (
 	"k8s.io/apimachinery/pkg/api/meta"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/types"
+	"k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/rest"
 	"k8s.io/klog/v2"
 	"sigs.k8s.io/controller-runtime/pkg/client"
@@ -45,6 +46,7 @@ type ClusterRegisterOption struct {
 	ClusterConfig      *rest.Config
 	Secret             corev1.Secret
 	ImpersonatorSecret corev1.Secret
+	ClusterID          string
 }
 
 // IsKubeCredentialsEnabled represents whether report secret
@@ -169,3 +171,12 @@ func updateCluster(controlPlaneClient karmadaclientset.Interface, cluster *clust
 
 	return newCluster, nil
 }
+
+// ObtainClusterID returns the cluster ID property with clusterKubeClient
+func ObtainClusterID(clusterKubeClient *kubernetes.Clientset) (string, error) {
+	ns, err := clusterKubeClient.CoreV1().Namespaces().Get(context.TODO(), metav1.NamespaceSystem, metav1.GetOptions{})
+	if err != nil {
+		return "", err
+	}
+	return string(ns.UID), nil
+}