Use Kubernetes recommended labels

Signed-off-by: Howard Lau <howardlau1999@hotmail.com>

controllers/controller_filer.go

@@ -10,6 +10,7 @@ import (
 	"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
 
 	seaweedv1 "github.com/seaweedfs/seaweedfs-operator/api/v1"
+	label "github.com/seaweedfs/seaweedfs-operator/controllers/label"
 )
 
 func (r *SeaweedReconciler) ensureFilerServers(seaweedCR *seaweedv1.Seaweed) (done bool, result ctrl.Result, err error) {
@@ -98,5 +99,9 @@ func (r *SeaweedReconciler) ensureFilerConfigMap(seaweedCR *seaweedv1.Seaweed) (
 }
 
 func labelsForFiler(name string) map[string]string {
-	return map[string]string{"app": "seaweedfs", "role": "filer", "name": name}
+	return map[string]string{
+		label.NameLabelKey:      "seaweedfs",
+		label.ComponentLabelKey: "filer",
+		label.InstanceLabelKey:  name,
+	}
 }

controllers/controller_master.go

@@ -10,6 +10,7 @@ import (
 	"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
 
 	seaweedv1 "github.com/seaweedfs/seaweedfs-operator/api/v1"
+	label "github.com/seaweedfs/seaweedfs-operator/controllers/label"
 )
 
 func (r *SeaweedReconciler) ensureMaster(seaweedCR *seaweedv1.Seaweed) (done bool, result ctrl.Result, err error) {
@@ -117,5 +118,9 @@ func (r *SeaweedReconciler) ensureMasterPeerService(seaweedCR *seaweedv1.Seaweed
 }
 
 func labelsForMaster(name string) map[string]string {
-	return map[string]string{"app": "seaweedfs", "role": "master", "name": name}
+	return map[string]string{
+		label.NameLabelKey:      "seaweedfs",
+		label.ComponentLabelKey: "master",
+		label.InstanceLabelKey:  name,
+	}
 }

controllers/controller_volume.go

@@ -10,6 +10,7 @@ import (
 	"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
 
 	seaweedv1 "github.com/seaweedfs/seaweedfs-operator/api/v1"
+	label "github.com/seaweedfs/seaweedfs-operator/controllers/label"
 )
 
 func (r *SeaweedReconciler) ensureVolumeServers(seaweedCR *seaweedv1.Seaweed) (done bool, result ctrl.Result, err error) {
@@ -80,5 +81,9 @@ func (r *SeaweedReconciler) ensureVolumeServerService(seaweedCR *seaweedv1.Seawe
 }
 
 func labelsForVolumeServer(name string) map[string]string {
-	return map[string]string{"app": "seaweedfs", "role": "volume", "name": name}
+	return map[string]string{
+		label.NameLabelKey:      "seaweedfs",
+		label.ComponentLabelKey: "volume",
+		label.InstanceLabelKey:  name,
+	}
 }

controllers/label/label.go

@@ -0,0 +1,18 @@
+package label
+
+const (
+	// The following labels are recommended by kubernetes https://kubernetes.io/docs/concepts/overview/working-with-objects/common-labels/
+
+	// ManagedByLabelKey is Kubernetes recommended label key, it represents the tool being used to manage the operation of an application
+	// For resources managed by SeaweedFS Operator, its value is always seaweedfs-operator
+	ManagedByLabelKey string = "app.kubernetes.io/managed-by"
+	// ComponentLabelKey is Kubernetes recommended label key, it represents the component within the architecture
+	ComponentLabelKey string = "app.kubernetes.io/component"
+	// NameLabelKey is Kubernetes recommended label key, it represents the name of the application
+	NameLabelKey string = "app.kubernetes.io/name"
+	// InstanceLabelKey is Kubernetes recommended label key, it represents a unique name identifying the instance of an application
+	// It's set by helm when installing a release
+	InstanceLabelKey string = "app.kubernetes.io/instance"
+	// VersionLabelKey is Kubernetes recommended label key, it represents the version of the app
+	VersionLabelKey string = "app.kubernetes.io/version"
+)