manager: add health probes

Author: cpanato

config/resources/manager/manager.yaml

@@ -23,6 +23,18 @@ spec:
         image: packet-controller
         imagePullPolicy: IfNotPresent
         name: manager
+        ports:
+        - containerPort: 9440
+          name: healthz
+          protocol: TCP
+        readinessProbe:
+          httpGet:
+            path: /readyz
+            port: healthz
+        livenessProbe:
+          httpGet:
+            path: /healthz
+            port: healthz
         resources:
           limits:
             cpu: 100m

main.go

@@ -24,6 +24,7 @@ import (
 	_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
 	"k8s.io/client-go/tools/record"
 	ctrl "sigs.k8s.io/controller-runtime"
+	"sigs.k8s.io/controller-runtime/pkg/healthz"
 	"sigs.k8s.io/controller-runtime/pkg/log/zap"
 
 	packet "sigs.k8s.io/cluster-api-provider-packet/pkg/cloud/packet"
@@ -47,12 +48,25 @@ func init() {
 }
 
 func main() {
-	var metricsAddr string
-	var enableLeaderElection bool
+
+	var (
+		metricsAddr          string
+		healthAddr           string
+		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.StringVar(&healthAddr,
+		"health-addr",
+		":9440",
+		"The address the health endpoint binds to.",
+	)
+
 	flag.Parse()
 
 	ctrl.SetLogger(zap.New(zap.UseDevMode(true)))
@@ -64,12 +78,13 @@ func main() {
 	})
 
 	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
-		Scheme:             scheme,
-		MetricsBindAddress: metricsAddr,
-		Port:               9443,
-		EventBroadcaster:   broadcaster,
-		LeaderElection:     enableLeaderElection,
-		LeaderElectionID:   "cad3ba79.cluster.x-k8s.io",
+		Scheme:                 scheme,
+		MetricsBindAddress:     metricsAddr,
+		Port:                   9443,
+		EventBroadcaster:       broadcaster,
+		LeaderElection:         enableLeaderElection,
+		LeaderElectionID:       "cad3ba79.cluster.x-k8s.io",
+		HealthProbeBindAddress: healthAddr,
 	})
 	if err != nil {
 		setupLog.Error(err, "unable to start manager")
@@ -105,6 +120,16 @@ func main() {
 	}
 	// +kubebuilder:scaffold:builder
 
+	if err := mgr.AddReadyzCheck("ping", healthz.Ping); err != nil {
+		setupLog.Error(err, "unable to create ready check")
+		os.Exit(1)
+	}
+
+	if err := mgr.AddHealthzCheck("ping", healthz.Ping); err != nil {
+		setupLog.Error(err, "unable to create health check")
+		os.Exit(1)
+	}
+
 	setupLog.Info("starting manager")
 	if err := mgr.Start(ctrl.SetupSignalHandler()); err != nil {
 		setupLog.Error(err, "problem running manager")