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main.go
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/
main.go
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/*
Copyright 2022 SUSE.
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 (
"flag"
"fmt"
"net/http"
"os"
"time"
// 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"
"github.com/spf13/pflag"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/runtime"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
clientgoscheme "k8s.io/client-go/kubernetes/scheme"
"k8s.io/klog/v2"
"k8s.io/klog/v2/klogr"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
clusterv1 "sigs.k8s.io/cluster-api/api/v1beta1"
bootstrapv1 "github.com/rancher-sandbox/cluster-api-provider-rke2/bootstrap/api/v1alpha1"
"github.com/rancher-sandbox/cluster-api-provider-rke2/bootstrap/internal/controllers"
controlplanev1 "github.com/rancher-sandbox/cluster-api-provider-rke2/controlplane/api/v1alpha1"
"github.com/rancher-sandbox/cluster-api-provider-rke2/pkg/consts"
)
var (
scheme = runtime.NewScheme()
setupLog = ctrl.Log.WithName("setup")
// flags.
metricsBindAddr string
enableLeaderElection bool
leaderElectionLeaseDuration time.Duration
leaderElectionRenewDeadline time.Duration
leaderElectionRetryPeriod time.Duration
watchFilterValue string
profilerAddress string
concurrencyNumber int
syncPeriod time.Duration
webhookPort int
webhookCertDir string
healthAddr string
)
func init() {
klog.InitFlags(nil)
utilruntime.Must(clientgoscheme.AddToScheme(scheme))
utilruntime.Must(bootstrapv1.AddToScheme(scheme))
utilruntime.Must(controlplanev1.AddToScheme(scheme))
utilruntime.Must(clusterv1.AddToScheme(scheme))
//+kubebuilder:scaffold:scheme
} //nolint:wsl
// InitFlags initializes the flags.
func InitFlags(fs *pflag.FlagSet) {
fs.StringVar(&metricsBindAddr, "metrics-bind-addr", ":8080",
"The address the metric endpoint binds to.")
fs.BoolVar(&enableLeaderElection, "leader-elect", false,
"Enable leader election for controller manager. Enabling this will ensure there is only one active controller manager.")
fs.DurationVar(&leaderElectionLeaseDuration, "leader-elect-lease-duration", consts.DefaultLeaderElectLeaseDuration,
"Interval at which non-leader candidates will wait to force acquire leadership (duration string)")
fs.DurationVar(&leaderElectionRenewDeadline, "leader-elect-renew-deadline", consts.DefaultLeaderElectRenewDeadline,
"Duration that the leading controller manager will retry refreshing leadership before giving up (duration string)")
fs.DurationVar(&leaderElectionRetryPeriod, "leader-elect-retry-period", consts.DefaultLeaderElectRetryPeriod,
"Duration the LeaderElector clients should wait between tries of actions (duration string)")
fs.StringVar(&watchFilterValue, "watch-filter", "",
fmt.Sprintf("Label value that the controller watches to reconcile cluster-api objects. Label key is always %s. If unspecified, the controller watches for all cluster-api objects.", clusterv1.WatchLabel)) //nolint:lll
fs.StringVar(&profilerAddress, "profiler-address", "",
"Bind address to expose the pprof profiler (e.g. localhost:6060)")
fs.IntVar(&concurrencyNumber, "concurrency", 1,
"Number of core resources to process simultaneously")
fs.DurationVar(&syncPeriod, "sync-period", consts.DefaultSyncPeriod,
"The minimum interval at which watched resources are reconciled (e.g. 15m)")
fs.IntVar(&webhookPort, "webhook-port", consts.DefaultWebhookPort, "Webhook Server port")
fs.StringVar(&webhookCertDir, "webhook-cert-dir", "/tmp/k8s-webhook-server/serving-certs/",
"Webhook cert dir, only used when webhook-port is specified.")
fs.StringVar(&healthAddr, "health-addr", ":9440",
"The address the health endpoint binds to.")
}
func main() {
InitFlags(pflag.CommandLine)
pflag.CommandLine.AddGoFlagSet(flag.CommandLine)
pflag.Parse()
ctrl.SetLogger(klogr.New())
if profilerAddress != "" {
klog.Infof("Profiler listening for requests at %s", profilerAddress)
go func() {
klog.Info(http.ListenAndServe(profilerAddress, nil))
}()
}
mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
Scheme: scheme,
MetricsBindAddress: metricsBindAddr,
LeaderElection: enableLeaderElection,
LeaderElectionID: "rke2-bootstrap-manager-leader-election-capi",
LeaseDuration: &leaderElectionLeaseDuration,
RenewDeadline: &leaderElectionRenewDeadline,
RetryPeriod: &leaderElectionRetryPeriod,
SyncPeriod: &syncPeriod,
ClientDisableCacheFor: []client.Object{
&corev1.ConfigMap{},
&corev1.Secret{},
},
Port: webhookPort,
CertDir: webhookCertDir,
HealthProbeBindAddress: healthAddr,
})
if err != nil {
setupLog.Error(err, "unable to start manager")
os.Exit(1)
}
setupChecks(mgr)
setupReconcilers(mgr)
setupWebhooks(mgr)
//+kubebuilder:scaffold:builder
setupLog.Info("starting manager")
if err := mgr.Start(ctrl.SetupSignalHandler()); err != nil {
setupLog.Error(err, "problem running manager")
os.Exit(1)
}
}
func setupChecks(mgr ctrl.Manager) {
if err := mgr.AddReadyzCheck("webhook", mgr.GetWebhookServer().StartedChecker()); err != nil {
setupLog.Error(err, "unable to create ready check")
os.Exit(1)
}
if err := mgr.AddHealthzCheck("webhook", mgr.GetWebhookServer().StartedChecker()); err != nil {
setupLog.Error(err, "unable to create health check")
os.Exit(1)
}
}
func setupReconcilers(mgr ctrl.Manager) {
if err := (&controllers.RKE2ConfigReconciler{
Client: mgr.GetClient(),
Scheme: mgr.GetScheme(),
}).SetupWithManager(mgr); err != nil {
setupLog.Error(err, "unable to create controller", "controller", "Rke2Config")
os.Exit(1)
}
}
func setupWebhooks(mgr ctrl.Manager) {
if err := (&bootstrapv1.RKE2Config{}).SetupWebhookWithManager(mgr); err != nil {
setupLog.Error(err, "unable to create webhook", "webhook", "Rke2Config")
os.Exit(1)
}
if err := (&bootstrapv1.RKE2ConfigTemplate{}).SetupWebhookWithManager(mgr); err != nil {
setupLog.Error(err, "unable to create webhook", "webhook", "Rke2ConfigTemplate")
os.Exit(1)
}
}