/
ocmagent.go
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/
ocmagent.go
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// Copyright Contributors to the Open Cluster Management project
package ocmcontroller
import (
"context"
"os"
"path"
"time"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/klog/v2"
aggregatorapiserver "k8s.io/kube-aggregator/pkg/apiserver"
clusterclient "open-cluster-management.io/api/client/cluster/clientset/versioned"
clusterv1 "open-cluster-management.io/api/cluster/v1"
"open-cluster-management.io/multicluster-controlplane/pkg/agent"
"open-cluster-management.io/multicluster-controlplane/pkg/servers/options"
"open-cluster-management.io/multicluster-controlplane/pkg/util"
)
const SelfManagementClusterLabel = "multicluster-controlplane.open-cluster-management.io/selfmanagement"
func InstallSelfManagementCluster(options options.ServerRunOptions) func(<-chan struct{}, *aggregatorapiserver.Config) error {
return func(stopCh <-chan struct{}, aggregatorConfig *aggregatorapiserver.Config) error {
inClusterConfig, err := rest.InClusterConfig()
if err != nil {
klog.Warning("Current runtime environment is not in a cluster, ignore --self-management flag.")
return nil
}
if !options.EnableSelfManagement {
// TODO if there is a self management cluster, cleanup its resources
return nil
}
ctx := util.GoContext(stopCh)
hubRestConfig := aggregatorConfig.GenericConfig.LoopbackClientConfig
hubRestConfig.ContentType = "application/json"
clusterName := options.SelfManagementClusterName
if len(clusterName) == 0 {
clusterName, err = util.GenerateSelfManagedClusterName(ctx, inClusterConfig)
if err != nil {
return err
}
}
go EnableSelfManagement(ctx, hubRestConfig, options.ControlplaneDataDir, clusterName)
return nil
}
}
func EnableSelfManagement(ctx context.Context, hubRestConfig *rest.Config, controlplaneCertDir, selfClusterName string) {
kubeClient, err := kubernetes.NewForConfig(hubRestConfig)
if err != nil {
klog.Fatalf("Failed to kube client, %v", err)
}
clusterClient, err := clusterclient.NewForConfig(hubRestConfig)
if err != nil {
klog.Fatalf("Failed to cluster client, %v", err)
}
if err := createNamespace(ctx, kubeClient, selfClusterName); err != nil {
klog.Fatalf("Failed to create self managed cluster namespace, %v", err)
}
// TODO need a controller to maintain the self managed cluster
if err := waitForSelfManagedCluster(ctx, clusterClient, selfClusterName); err != nil {
klog.Fatalf("Failed to create self managed cluster, %v", err)
}
bootstrapKubeConfig := path.Join(controlplaneCertDir, "cert", "kube-aggregator.kubeconfig")
agentHubKubeconfigDir := path.Join(controlplaneCertDir, "agent", "hub-kubeconfig")
if err := os.MkdirAll(agentHubKubeconfigDir, os.ModePerm); err != nil {
klog.Fatalf("Failed to create dir %s, %v", agentHubKubeconfigDir, err)
}
// TODO also need provide feature gates
klusterletAgent := agent.NewAgentOptions().
WithClusterName(selfClusterName).
WithBootstrapKubeconfig(bootstrapKubeConfig).
WithHubKubeconfigDir(agentHubKubeconfigDir).
WithWorkloadSourceDriverConfig(agentHubKubeconfigDir + "/kubeconfig")
if err := klusterletAgent.RunAgent(ctx); err != nil {
klog.Fatalf("failed to start agents, %v", err)
}
}
func createNamespace(ctx context.Context, kubeClient kubernetes.Interface, ns string) error {
_, err := kubeClient.CoreV1().Namespaces().Get(ctx, ns, metav1.GetOptions{})
if errors.IsNotFound(err) {
_, err := kubeClient.CoreV1().Namespaces().Create(
ctx,
&corev1.Namespace{
ObjectMeta: metav1.ObjectMeta{
Name: ns,
},
},
metav1.CreateOptions{},
)
return err
}
return err
}
func waitForSelfManagedCluster(ctx context.Context, clusterClient clusterclient.Interface, selfClusterName string) error {
return wait.PollUntilContextCancel(ctx, 5*time.Second, true, func(ctx context.Context) (bool, error) {
selfCluster, err := clusterClient.ClusterV1().ManagedClusters().Get(ctx, selfClusterName, metav1.GetOptions{})
if errors.IsNotFound(err) {
_, err := clusterClient.ClusterV1().ManagedClusters().Create(
ctx,
&clusterv1.ManagedCluster{
ObjectMeta: metav1.ObjectMeta{
Name: selfClusterName,
Labels: map[string]string{
SelfManagementClusterLabel: "",
},
},
Spec: clusterv1.ManagedClusterSpec{
HubAcceptsClient: true,
},
},
metav1.CreateOptions{},
)
return false, err
}
if err != nil {
return false, err
}
return meta.IsStatusConditionTrue(selfCluster.Status.Conditions, clusterv1.ManagedClusterConditionHubAccepted), nil
})
}