main.go

Documentation: sigs.k8s.io/controller-runtime/examples/builtins

     1  /*
     2  Copyright 2018 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package main
    18  
    19  import (
    20  	"os"
    21  
    22  	appsv1 "k8s.io/api/apps/v1"
    23  	corev1 "k8s.io/api/core/v1"
    24  	_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
    25  	"sigs.k8s.io/controller-runtime/pkg/builder"
    26  	"sigs.k8s.io/controller-runtime/pkg/client/config"
    27  	"sigs.k8s.io/controller-runtime/pkg/controller"
    28  	"sigs.k8s.io/controller-runtime/pkg/handler"
    29  	"sigs.k8s.io/controller-runtime/pkg/log"
    30  	"sigs.k8s.io/controller-runtime/pkg/log/zap"
    31  	"sigs.k8s.io/controller-runtime/pkg/manager"
    32  	"sigs.k8s.io/controller-runtime/pkg/manager/signals"
    33  	"sigs.k8s.io/controller-runtime/pkg/source"
    34  )
    35  
    36  func init() {
    37  	log.SetLogger(zap.New())
    38  }
    39  
    40  func main() {
    41  	entryLog := log.Log.WithName("entrypoint")
    42  
    43  	// Setup a Manager
    44  	entryLog.Info("setting up manager")
    45  	mgr, err := manager.New(config.GetConfigOrDie(), manager.Options{})
    46  	if err != nil {
    47  		entryLog.Error(err, "unable to set up overall controller manager")
    48  		os.Exit(1)
    49  	}
    50  
    51  	// Setup a new controller to reconcile ReplicaSets
    52  	entryLog.Info("Setting up controller")
    53  	c, err := controller.New("foo-controller", mgr, controller.Options{
    54  		Reconciler: &reconcileReplicaSet{client: mgr.GetClient()},
    55  	})
    56  	if err != nil {
    57  		entryLog.Error(err, "unable to set up individual controller")
    58  		os.Exit(1)
    59  	}
    60  
    61  	// Watch ReplicaSets and enqueue ReplicaSet object key
    62  	if err := c.Watch(source.Kind(mgr.GetCache(), &appsv1.ReplicaSet{}, &handler.TypedEnqueueRequestForObject[*appsv1.ReplicaSet]{})); err != nil {
    63  		entryLog.Error(err, "unable to watch ReplicaSets")
    64  		os.Exit(1)
    65  	}
    66  
    67  	// Watch Pods and enqueue owning ReplicaSet key
    68  	if err := c.Watch(source.Kind(mgr.GetCache(), &corev1.Pod{},
    69  		handler.TypedEnqueueRequestForOwner[*corev1.Pod](mgr.GetScheme(), mgr.GetRESTMapper(), &appsv1.ReplicaSet{}, handler.OnlyControllerOwner()))); err != nil {
    70  		entryLog.Error(err, "unable to watch Pods")
    71  		os.Exit(1)
    72  	}
    73  
    74  	if err := builder.WebhookManagedBy(mgr).
    75  		For(&corev1.Pod{}).
    76  		WithDefaulter(&podAnnotator{}).
    77  		WithValidator(&podValidator{}).
    78  		Complete(); err != nil {
    79  		entryLog.Error(err, "unable to create webhook", "webhook", "Pod")
    80  		os.Exit(1)
    81  	}
    82  
    83  	entryLog.Info("starting manager")
    84  	if err := mgr.Start(signals.SetupSignalHandler()); err != nil {
    85  		entryLog.Error(err, "unable to run manager")
    86  		os.Exit(1)
    87  	}
    88  }
    89
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