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main.go
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main.go
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/*
# Copyright 2021 IBM Corporation
#
# 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"
"os"
"k8s.io/apimachinery/pkg/runtime"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
clientgoscheme "k8s.io/client-go/kubernetes/scheme"
_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/log/zap"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
storagev1 "k8s.io/api/storage/v1"
mongodbv1alpha1 "github.com/IBM/ibm-mongodb-operator/api/v1alpha1"
mongodbcontroller "github.com/IBM/ibm-mongodb-operator/controllers"
// +kubebuilder:scaffold:imports
)
var (
scheme = runtime.NewScheme()
setupLog = ctrl.Log.WithName("setup")
)
func init() {
utilruntime.Must(clientgoscheme.AddToScheme(scheme))
utilruntime.Must(mongodbv1alpha1.AddToScheme(scheme))
// +kubebuilder:scaffold:scheme
}
func main() {
var metricsAddr string
var enableLeaderElection bool
flag.StringVar(&metricsAddr, "metrics-addr", ":8080", "The address the metric endpoint binds to.")
flag.BoolVar(&enableLeaderElection, "enable-leader-election", false,
"Enable leader election for controller manager. "+
"Enabling this will ensure there is only one active controller manager.")
flag.Parse()
ctrl.SetLogger(zap.New(zap.UseDevMode(true)))
watchNamespace, err := getWatchNamespace()
if err != nil {
setupLog.Error(err, "unable to get WatchNamespace, "+
"the manager will watch and manage resources in all namespaces")
}
options := ctrl.Options{
Scheme: scheme,
MetricsBindAddress: metricsAddr,
Port: 9443,
LeaderElection: enableLeaderElection,
LeaderElectionID: "9c0e1ee9.operator.ibm.com",
Namespace: watchNamespace,
}
mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), options)
if err != nil {
setupLog.Error(err, "unable to start manager")
os.Exit(1)
}
// Setup Scheme for all resources
if err := appsv1.AddToScheme(mgr.GetScheme()); err != nil {
setupLog.Error(err, "")
os.Exit(1)
}
if err := corev1.AddToScheme(mgr.GetScheme()); err != nil {
setupLog.Error(err, "")
os.Exit(1)
}
if err := storagev1.AddToScheme(mgr.GetScheme()); err != nil {
setupLog.Error(err, "")
os.Exit(1)
}
if err = (&mongodbcontroller.MongoDBReconciler{
Client: mgr.GetClient(),
Reader: mgr.GetAPIReader(),
Log: ctrl.Log.WithName("controllers").WithName("MongoDB"),
Scheme: mgr.GetScheme(),
}).SetupWithManager(mgr); err != nil {
setupLog.Error(err, "unable to create controller", "controller", "MongoDB")
os.Exit(1)
}
// +kubebuilder:scaffold:builder
setupLog.Info("starting manager")
if err := mgr.Start(ctrl.SetupSignalHandler()); err != nil {
setupLog.Error(err, "problem running manager")
os.Exit(1)
}
}
// getWatchNamespace returns the Namespace the operator should be watching for changes
func getWatchNamespace() (string, error) {
// WatchNamespaceEnvVar is the constant for env variable WATCH_NAMESPACE
// which specifies the Namespace to watch.
// An empty value means the operator is running with cluster scope.
var watchNamespaceEnvVar = "WATCH_NAMESPACE"
ns, found := os.LookupEnv(watchNamespaceEnvVar)
if !found {
return "", fmt.Errorf("%s must be set", watchNamespaceEnvVar)
}
return ns, nil
}