kubeadm: Fix a small bug in the self-hosting code

cmd/kubeadm/app/phases/selfhosting/selfhosting.go

@@ -141,6 +141,9 @@ func BuildDaemonSet(name string, podSpec *v1.PodSpec, mutators map[string][]PodS
 			Labels:    BuildSelfhostedComponentLabels(name),
 		},
 		Spec: apps.DaemonSetSpec{
+			Selector: &metav1.LabelSelector{
+				MatchLabels: BuildSelfhostedComponentLabels(name),
+			},
 			Template: v1.PodTemplateSpec{
 				ObjectMeta: metav1.ObjectMeta{
 					Labels: BuildSelfhostedComponentLabels(name),

cmd/kubeadm/app/phases/selfhosting/selfhosting_test.go

@@ -113,6 +113,9 @@ metadata:
   name: self-hosted-kube-apiserver
   namespace: kube-system
 spec:
+  selector:
+    matchLabels:
+      k8s-app: self-hosted-kube-apiserver
   template:
     metadata:
       creationTimestamp: null
@@ -271,6 +274,9 @@ metadata:
   name: self-hosted-kube-controller-manager
   namespace: kube-system
 spec:
+  selector:
+    matchLabels:
+      k8s-app: self-hosted-kube-controller-manager
   template:
     metadata:
       creationTimestamp: null
@@ -398,6 +404,9 @@ metadata:
   name: self-hosted-kube-scheduler
   namespace: kube-system
 spec:
+  selector:
+    matchLabels:
+      k8s-app: self-hosted-kube-scheduler
   template:
     metadata:
       creationTimestamp: null