/
main.go
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/
main.go
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/*
Copyright 2021.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package main
import (
"context"
"flag"
"os"
// Import all Kubernetes client auth plugins (e.g. Azure, GCP, OIDC, etc.)
// to ensure that exec-entrypoint and run can make use of them.
_ "k8s.io/client-go/plugin/pkg/client/auth"
"k8s.io/apimachinery/pkg/runtime"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
clientgoscheme "k8s.io/client-go/kubernetes/scheme"
"k8s.io/klog/v2"
"k8s.io/klog/v2/textlogger"
"open-cluster-management.io/addon-framework/pkg/addonmanager"
addonutil "open-cluster-management.io/addon-framework/pkg/utils"
addonv1alpha1 "open-cluster-management.io/api/addon/v1alpha1"
"open-cluster-management.io/api/client/addon/clientset/versioned"
addonclient "open-cluster-management.io/api/client/addon/clientset/versioned"
"open-cluster-management.io/api/client/addon/informers/externalversions"
clusterv1beta2 "open-cluster-management.io/api/cluster/v1beta2"
proxyv1alpha1 "open-cluster-management.io/cluster-proxy/pkg/apis/proxy/v1alpha1"
"open-cluster-management.io/cluster-proxy/pkg/config"
"open-cluster-management.io/cluster-proxy/pkg/proxyagent/agent"
"open-cluster-management.io/cluster-proxy/pkg/proxyserver/controllers"
"open-cluster-management.io/cluster-proxy/pkg/proxyserver/operator/authentication/selfsigned"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/healthz"
metricsserver "sigs.k8s.io/controller-runtime/pkg/metrics/server"
//+kubebuilder:scaffold:imports
)
var (
scheme = runtime.NewScheme()
setupLog = ctrl.Log.WithName("setup")
)
func init() {
utilruntime.Must(clientgoscheme.AddToScheme(scheme))
utilruntime.Must(addonv1alpha1.AddToScheme(scheme))
utilruntime.Must(proxyv1alpha1.AddToScheme(scheme))
utilruntime.Must(clusterv1beta2.AddToScheme(scheme))
//+kubebuilder:scaffold:scheme
}
func main() {
var metricsAddr string
var enableLeaderElection bool
var probeAddr string
var signerSecretNamespace, signerSecretName string
var agentInstallAll bool
var enableKubeApiProxy bool
logger := textlogger.NewLogger(textlogger.NewConfig())
klog.SetOutput(os.Stdout)
klog.InitFlags(flag.CommandLine)
flag.StringVar(&metricsAddr, "metrics-bind-address", ":58080", "The address the metric endpoint binds to.")
flag.StringVar(&probeAddr, "health-probe-bind-address", ":58081", "The address the probe endpoint binds to.")
flag.BoolVar(&enableLeaderElection, "leader-elect", false,
"Enable leader election for controller manager. "+
"Enabling this will ensure there is only one active controller manager.")
flag.StringVar(&signerSecretNamespace, "signer-secret-namespace", "default",
"The namespace of the secret to store the signer CA")
flag.StringVar(&signerSecretName, "signer-secret-name", "cluster-proxy-signer",
"The name of the secret to store the signer CA")
flag.StringVar(&config.AgentImageName, "agent-image-name",
config.AgentImageName,
"The name of the addon agent's image")
flag.StringVar(&config.AddonInstallNamespace, "agent-install-namespace", config.DefaultAddonInstallNamespace,
"The target namespace to install the addon agents.")
flag.BoolVar(
&agentInstallAll, "agent-install-all", false,
"Configure the install strategy of agent on managed clusters. "+
"Enabling this will automatically install agent on all managed cluster.")
flag.BoolVar(&enableKubeApiProxy, "enable-kube-api-proxy", true, "Enable proxy to agent kube-apiserver")
flag.Parse()
// pipe controller-runtime logs to klog
ctrl.SetLogger(logger)
mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
Scheme: scheme,
Metrics: metricsserver.Options{BindAddress: metricsAddr},
HealthProbeBindAddress: probeAddr,
LeaderElection: enableLeaderElection,
LeaderElectionID: "cluster-proxy-addon-manager",
})
if err != nil {
setupLog.Error(err, "unable to start manager")
os.Exit(1)
}
client, err := versioned.NewForConfig(mgr.GetConfig())
if err != nil {
setupLog.Error(err, "unable to set up addon client")
os.Exit(1)
}
nativeClient, err := kubernetes.NewForConfig(mgr.GetConfig())
if err != nil {
setupLog.Error(err, "unable to set up kubernetes native client")
os.Exit(1)
}
addonClient, err := addonclient.NewForConfig(mgr.GetConfig())
if err != nil {
setupLog.Error(err, "unable to set up ocm addon client")
os.Exit(1)
}
supportsV1CSR, supportsV1beta1CSR, err := addonutil.IsCSRSupported(nativeClient)
if err != nil {
setupLog.Error(err, "unable to detect available CSR API versions")
os.Exit(1)
}
if supportsV1CSR {
setupLog.Info("V1 CSR API found")
} else if supportsV1beta1CSR {
setupLog.Info("V1 CSR API not found, falling back to v1beta1")
} else {
setupLog.Error(err, "No supported CSR api found")
os.Exit(1)
}
informerFactory := externalversions.NewSharedInformerFactory(client, 0)
nativeInformer := informers.NewSharedInformerFactoryWithOptions(nativeClient, 0)
// loading self-signer
selfSigner, err := selfsigned.NewSelfSignerFromSecretOrGenerate(
nativeClient, signerSecretNamespace, signerSecretName)
if err != nil {
setupLog.Error(err, "failed loading self-signer")
os.Exit(1)
}
if err := controllers.RegisterClusterManagementAddonReconciler(
mgr,
selfSigner,
nativeClient,
nativeInformer.Core().V1().Secrets(),
supportsV1CSR,
); err != nil {
setupLog.Error(err, "unable to create controller", "controller", "ClusterManagementAddonReconciler")
os.Exit(1)
}
if err := controllers.RegisterServiceResolverReconciler(mgr); err != nil {
setupLog.Error(err, "unable to create controller", "controller", "ServiceResolverReconciler")
os.Exit(1)
}
//+kubebuilder:scaffold:builder
if err := mgr.AddHealthzCheck("healthz", healthz.Ping); err != nil {
setupLog.Error(err, "unable to set up health check")
os.Exit(1)
}
if err := mgr.AddReadyzCheck("readyz", healthz.Ping); err != nil {
setupLog.Error(err, "unable to set up ready check")
os.Exit(1)
}
addonManager, err := addonmanager.New(mgr.GetConfig())
if err != nil {
setupLog.Error(err, "unable to set up ready check")
os.Exit(1)
}
clusterProxyAddon, err := agent.NewAgentAddon(
selfSigner,
signerSecretNamespace,
supportsV1CSR,
mgr.GetClient(),
nativeClient,
agentInstallAll,
enableKubeApiProxy,
addonClient,
)
if err != nil {
setupLog.Error(err, "unable to instantiate cluster-proxy addon")
os.Exit(1)
}
if err := addonManager.AddAgent(clusterProxyAddon); err != nil {
setupLog.Error(err, "unable to register cluster-proxy addon")
os.Exit(1)
}
ctx, cancel := context.WithCancel(ctrl.SetupSignalHandler())
defer cancel()
go informerFactory.Start(ctx.Done())
go nativeInformer.Start(ctx.Done())
go func() {
if err := addonManager.Start(ctx); err != nil {
setupLog.Error(err, "unable to start addon manager")
os.Exit(1)
}
}()
setupLog.Info("starting manager")
if err := mgr.Start(ctx); err != nil {
setupLog.Error(err, "problem running manager")
os.Exit(1)
}
}