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🐛 KubeadmControlPlane should adopt v1alpha2 kubeconfig secrets #4050

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merged 1 commit into from
Jan 6, 2021
Merged

🐛 KubeadmControlPlane should adopt v1alpha2 kubeconfig secrets #4050

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2 changes: 1 addition & 1 deletion controlplane/kubeadm/controllers/controller.go
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Original file line number Diff line number Diff line change
Expand Up @@ -270,7 +270,7 @@ func (r *KubeadmControlPlaneReconciler) reconcile(ctx context.Context, cluster *
}

// Generate Cluster Kubeconfig if needed
if err := r.reconcileKubeconfig(ctx, util.ObjectKey(cluster), cluster.Spec.ControlPlaneEndpoint, kcp); err != nil {
if err := r.reconcileKubeconfig(ctx, cluster, kcp); err != nil {
logger.Error(err, "failed to reconcile Kubeconfig")
return ctrl.Result{}, err
}
Expand Down
33 changes: 31 additions & 2 deletions controlplane/kubeadm/controllers/helpers.go
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Original file line number Diff line number Diff line change
Expand Up @@ -39,15 +39,16 @@ import (
"sigs.k8s.io/cluster-api/util/kubeconfig"
"sigs.k8s.io/cluster-api/util/patch"
"sigs.k8s.io/cluster-api/util/secret"
"sigs.k8s.io/controller-runtime/pkg/client"
)

func (r *KubeadmControlPlaneReconciler) reconcileKubeconfig(ctx context.Context, clusterName client.ObjectKey, endpoint clusterv1.APIEndpoint, kcp *controlplanev1.KubeadmControlPlane) error {
func (r *KubeadmControlPlaneReconciler) reconcileKubeconfig(ctx context.Context, cluster *clusterv1.Cluster, kcp *controlplanev1.KubeadmControlPlane) error {
endpoint := cluster.Spec.ControlPlaneEndpoint
if endpoint.IsZero() {
return nil
}

controllerOwnerRef := *metav1.NewControllerRef(kcp, controlplanev1.GroupVersion.WithKind("KubeadmControlPlane"))
clusterName := util.ObjectKey(cluster)
configSecret, err := secret.GetFromNamespacedName(ctx, r.Client, clusterName, secret.Kubeconfig)
switch {
case apierrors.IsNotFound(errors.Cause(err)):
Expand All @@ -68,6 +69,14 @@ func (r *KubeadmControlPlaneReconciler) reconcileKubeconfig(ctx context.Context,
return errors.Wrap(err, "failed to retrieve kubeconfig Secret")
}

// check if the kubeconfig secret was created by v1alpha2 controllers, and thus it has the Cluster as the owner instead of KCP;
// if yes, adopt it.
if util.IsOwnedByObject(configSecret, cluster) && !util.IsControlledBy(configSecret, kcp) {
if err := r.adoptKubeconfigSecret(ctx, cluster, configSecret, controllerOwnerRef); err != nil {
return err
}
}

// only do rotation on owned secrets
if !util.IsControlledBy(configSecret, kcp) {
return nil
Expand All @@ -88,6 +97,26 @@ func (r *KubeadmControlPlaneReconciler) reconcileKubeconfig(ctx context.Context,
return nil
}

func (r *KubeadmControlPlaneReconciler) adoptKubeconfigSecret(ctx context.Context, cluster *clusterv1.Cluster, configSecret *corev1.Secret, controllerOwnerRef metav1.OwnerReference) error {
r.Log.Info("Adopting KubeConfig secret created by v1alpha2 controllers", "Name", configSecret.Name)

patchHelper, err := patch.NewHelper(configSecret, r.Client)
if err != nil {
return errors.Wrap(err, "failed to create patch helper for the kubeconfig secret")
}
configSecret.OwnerReferences = util.RemoveOwnerRef(configSecret.OwnerReferences, metav1.OwnerReference{
APIVersion: clusterv1.GroupVersion.String(),
Kind: "Cluster",
Name: cluster.Name,
UID: cluster.UID,
})
configSecret.OwnerReferences = util.EnsureOwnerRef(configSecret.OwnerReferences, controllerOwnerRef)
if err := patchHelper.Patch(ctx, configSecret); err != nil {
return errors.Wrap(err, "failed to patch the kubeconfig secret")
}
return nil
}

func (r *KubeadmControlPlaneReconciler) reconcileExternalReference(ctx context.Context, cluster *clusterv1.Cluster, ref corev1.ObjectReference) error {
if !strings.HasSuffix(ref.Kind, external.TemplateSuffix) {
return nil
Expand Down
253 changes: 114 additions & 139 deletions controlplane/kubeadm/controllers/helpers_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -34,48 +34,32 @@ import (
"sigs.k8s.io/cluster-api/controllers/external"
controlplanev1 "sigs.k8s.io/cluster-api/controlplane/kubeadm/api/v1alpha3"
"sigs.k8s.io/cluster-api/controlplane/kubeadm/internal"
"sigs.k8s.io/cluster-api/util"
"sigs.k8s.io/cluster-api/util/kubeconfig"
"sigs.k8s.io/cluster-api/util/secret"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/log"
)

func TestReconcileKubeconfigEmptyAPIEndpoints(t *testing.T) {
g := NewWithT(t)

kcp := &controlplanev1.KubeadmControlPlane{
func TestReconcileKubeconfig(t *testing.T) {
cluster := &clusterv1.Cluster{
TypeMeta: metav1.TypeMeta{
Kind: "Cluster",
APIVersion: clusterv1.GroupVersion.String(),
},
ObjectMeta: metav1.ObjectMeta{
Name: "foo",
Namespace: "test",
},
Spec: controlplanev1.KubeadmControlPlaneSpec{
Version: "v1.16.6",
Spec: clusterv1.ClusterSpec{
ControlPlaneEndpoint: clusterv1.APIEndpoint{Host: "test.local", Port: 8443},
},
}
clusterName := client.ObjectKey{Namespace: "test", Name: "foo"}

fakeClient := newFakeClient(g, kcp.DeepCopy())
r := &KubeadmControlPlaneReconciler{
Client: fakeClient,
Log: log.Log,
recorder: record.NewFakeRecorder(32),
}

g.Expect(r.reconcileKubeconfig(context.Background(), clusterName, clusterv1.APIEndpoint{}, kcp)).To(Succeed())

kubeconfigSecret := &corev1.Secret{}
secretName := client.ObjectKey{
Namespace: "test",
Name: secret.Name(clusterName.Name, secret.Kubeconfig),
}
g.Expect(r.Client.Get(context.Background(), secretName, kubeconfigSecret)).To(MatchError(ContainSubstring("not found")))
}

func TestReconcileKubeconfigMissingCACertificate(t *testing.T) {
g := NewWithT(t)

kcp := &controlplanev1.KubeadmControlPlane{
TypeMeta: metav1.TypeMeta{
Kind: "KubeadmControlPlane",
APIVersion: controlplanev1.GroupVersion.String(),
},
ObjectMeta: metav1.ObjectMeta{
Name: "foo",
Namespace: "test",
Expand All @@ -84,122 +68,113 @@ func TestReconcileKubeconfigMissingCACertificate(t *testing.T) {
Version: "v1.16.6",
},
}
clusterName := client.ObjectKey{Namespace: "test", Name: "foo"}
endpoint := clusterv1.APIEndpoint{Host: "test.local", Port: 8443}

fakeClient := newFakeClient(g, kcp.DeepCopy())
r := &KubeadmControlPlaneReconciler{
Client: fakeClient,
Log: log.Log,
recorder: record.NewFakeRecorder(32),
}

g.Expect(r.reconcileKubeconfig(context.Background(), clusterName, endpoint, kcp)).NotTo(Succeed())

kubeconfigSecret := &corev1.Secret{}
secretName := client.ObjectKey{
Namespace: "test",
Name: secret.Name(clusterName.Name, secret.Kubeconfig),
}
g.Expect(r.Client.Get(context.Background(), secretName, kubeconfigSecret)).To(MatchError(ContainSubstring("not found")))
}

func TestReconcileKubeconfigSecretAlreadyExists(t *testing.T) {
g := NewWithT(t)

cluster := &clusterv1.Cluster{
ObjectMeta: metav1.ObjectMeta{
Name: "foo",
t.Run("Empty API Endpoints", func(t *testing.T) {
g := NewWithT(t)
fakeClient := newFakeClient(g, kcp.DeepCopy())
r := &KubeadmControlPlaneReconciler{
Client: fakeClient,
Log: log.Log,
recorder: record.NewFakeRecorder(32),
}

c := cluster.DeepCopy()
c.Spec.ControlPlaneEndpoint = clusterv1.APIEndpoint{}
g.Expect(r.reconcileKubeconfig(context.Background(), c, kcp)).To(Succeed())

kubeconfigSecret := &corev1.Secret{}
secretName := client.ObjectKey{
Namespace: "test",
},
}

kcp := &controlplanev1.KubeadmControlPlane{
ObjectMeta: metav1.ObjectMeta{
Name: "foo",
Name: secret.Name(c.Name, secret.Kubeconfig),
}
g.Expect(r.Client.Get(context.Background(), secretName, kubeconfigSecret)).To(MatchError(ContainSubstring("not found")))
})

t.Run("Missing CA Certificate", func(t *testing.T) {
g := NewWithT(t)
fakeClient := newFakeClient(g, kcp.DeepCopy())
r := &KubeadmControlPlaneReconciler{
Client: fakeClient,
Log: log.Log,
recorder: record.NewFakeRecorder(32),
}

g.Expect(r.reconcileKubeconfig(context.Background(), cluster, kcp)).NotTo(Succeed())

kubeconfigSecret := &corev1.Secret{}
secretName := client.ObjectKey{
Namespace: "test",
},
Spec: controlplanev1.KubeadmControlPlaneSpec{
Version: "v1.16.6",
},
}
clusterName := util.ObjectKey(cluster)
endpoint := clusterv1.APIEndpoint{Host: "test.local", Port: 8443}

existingKubeconfigSecret := kubeconfig.GenerateSecretWithOwner(
client.ObjectKey{Name: "foo", Namespace: "test"},
[]byte{},
*metav1.NewControllerRef(cluster, clusterv1.GroupVersion.WithKind("Cluster")),
)

fakeClient := newFakeClient(g, kcp.DeepCopy(), existingKubeconfigSecret.DeepCopy())
r := &KubeadmControlPlaneReconciler{
Client: fakeClient,
Log: log.Log,
recorder: record.NewFakeRecorder(32),
}

g.Expect(r.reconcileKubeconfig(context.Background(), clusterName, endpoint, kcp)).To(Succeed())

kubeconfigSecret := &corev1.Secret{}
secretName := client.ObjectKey{
Namespace: "test",
Name: secret.Name(clusterName.Name, secret.Kubeconfig),
}
g.Expect(r.Client.Get(context.Background(), secretName, kubeconfigSecret)).To(Succeed())
g.Expect(kubeconfigSecret.Labels).To(Equal(existingKubeconfigSecret.Labels))
g.Expect(kubeconfigSecret.Data).To(Equal(existingKubeconfigSecret.Data))
g.Expect(kubeconfigSecret.OwnerReferences).NotTo(ContainElement(*metav1.NewControllerRef(kcp, controlplanev1.GroupVersion.WithKind("KubeadmControlPlane"))))

}

func TestKubeadmControlPlaneReconciler_reconcileKubeconfig(t *testing.T) {
g := NewWithT(t)

cluster := &clusterv1.Cluster{
ObjectMeta: metav1.ObjectMeta{
Name: "foo",
Name: secret.Name(cluster.Name, secret.Kubeconfig),
}
g.Expect(r.Client.Get(context.Background(), secretName, kubeconfigSecret)).To(MatchError(ContainSubstring("not found")))
})

t.Run("Adopts v1alpha2 Secrets", func(t *testing.T) {
g := NewWithT(t)
existingKubeconfigSecret := kubeconfig.GenerateSecretWithOwner(
client.ObjectKey{Name: "foo", Namespace: "test"},
[]byte{},
metav1.OwnerReference{
APIVersion: clusterv1.GroupVersion.String(),
Kind: "Cluster",
Name: cluster.Name,
UID: cluster.UID,
}, // the Cluster ownership defines v1alpha2 controlled secrets
)

fakeClient := newFakeClient(g, kcp.DeepCopy(), existingKubeconfigSecret.DeepCopy())
r := &KubeadmControlPlaneReconciler{
Client: fakeClient,
Log: log.Log,
recorder: record.NewFakeRecorder(32),
}

g.Expect(r.reconcileKubeconfig(context.Background(), cluster, kcp)).To(Succeed())

kubeconfigSecret := &corev1.Secret{}
secretName := client.ObjectKey{
Namespace: "test",
},
}

kcp := &controlplanev1.KubeadmControlPlane{
ObjectMeta: metav1.ObjectMeta{
Name: "foo",
Name: secret.Name(cluster.Name, secret.Kubeconfig),
}
g.Expect(r.Client.Get(context.Background(), secretName, kubeconfigSecret)).To(Succeed())
g.Expect(kubeconfigSecret.Labels).To(Equal(existingKubeconfigSecret.Labels))
g.Expect(kubeconfigSecret.Data).To(Equal(existingKubeconfigSecret.Data))
g.Expect(kubeconfigSecret.OwnerReferences).ToNot(ContainElement(metav1.OwnerReference{
APIVersion: clusterv1.GroupVersion.String(),
Kind: "Cluster",
Name: cluster.Name,
UID: cluster.UID,
}))
g.Expect(kubeconfigSecret.OwnerReferences).To(ContainElement(*metav1.NewControllerRef(kcp, controlplanev1.GroupVersion.WithKind("KubeadmControlPlane"))))
})

t.Run("Does not adopt user secrets", func(t *testing.T) {
g := NewWithT(t)
existingKubeconfigSecret := kubeconfig.GenerateSecretWithOwner(
client.ObjectKey{Name: "foo", Namespace: "test"},
[]byte{},
metav1.OwnerReference{},
)

fakeClient := newFakeClient(g, kcp.DeepCopy(), existingKubeconfigSecret.DeepCopy())
r := &KubeadmControlPlaneReconciler{
Client: fakeClient,
Log: log.Log,
recorder: record.NewFakeRecorder(32),
}

g.Expect(r.reconcileKubeconfig(context.Background(), cluster, kcp)).To(Succeed())

kubeconfigSecret := &corev1.Secret{}
secretName := client.ObjectKey{
Namespace: "test",
},
Spec: controlplanev1.KubeadmControlPlaneSpec{
Version: "v1.16.6",
},
}
clusterName := util.ObjectKey(cluster)
endpoint := clusterv1.APIEndpoint{Host: "test.local", Port: 8443}

clusterCerts := secret.NewCertificatesForInitialControlPlane(&kubeadmv1.ClusterConfiguration{})
g.Expect(clusterCerts.Generate()).To(Succeed())
caCert := clusterCerts.GetByPurpose(secret.ClusterCA)
existingCACertSecret := caCert.AsSecret(
client.ObjectKey{Namespace: "test", Name: "foo"},
*metav1.NewControllerRef(kcp, controlplanev1.GroupVersion.WithKind("KubeadmControlPlane")),
)

fakeClient := newFakeClient(g, kcp.DeepCopy(), existingCACertSecret.DeepCopy())
r := &KubeadmControlPlaneReconciler{
Client: fakeClient,
Log: log.Log,
recorder: record.NewFakeRecorder(32),
}
g.Expect(r.reconcileKubeconfig(context.Background(), clusterName, endpoint, kcp)).To(Succeed())

kubeconfigSecret := &corev1.Secret{}
secretName := client.ObjectKey{
Namespace: "test",
Name: secret.Name(clusterName.Name, secret.Kubeconfig),
}
g.Expect(r.Client.Get(context.Background(), secretName, kubeconfigSecret)).To(Succeed())
g.Expect(kubeconfigSecret.OwnerReferences).NotTo(BeEmpty())
g.Expect(kubeconfigSecret.OwnerReferences).To(ContainElement(*metav1.NewControllerRef(kcp, controlplanev1.GroupVersion.WithKind("KubeadmControlPlane"))))
g.Expect(kubeconfigSecret.Labels).To(HaveKeyWithValue(clusterv1.ClusterLabelName, clusterName.Name))
Name: secret.Name(cluster.Name, secret.Kubeconfig),
}
g.Expect(r.Client.Get(context.Background(), secretName, kubeconfigSecret)).To(Succeed())
g.Expect(kubeconfigSecret.Labels).To(Equal(existingKubeconfigSecret.Labels))
g.Expect(kubeconfigSecret.Data).To(Equal(existingKubeconfigSecret.Data))
g.Expect(kubeconfigSecret.OwnerReferences).ToNot(ContainElement(*metav1.NewControllerRef(kcp, controlplanev1.GroupVersion.WithKind("KubeadmControlPlane"))))
})
}

func TestCloneConfigsAndGenerateMachine(t *testing.T) {
Expand Down