extensions: support paused deployments

This commit adds support for paused deployments so a user can choose
when to run a deployment that exists in the system instead of having
the deployment controller automatically reconciling it after every
change or sync interval.

pkg/apis/extensions/types.go

@@ -228,6 +228,10 @@ type DeploymentSpec struct {
 	// Value of this key is hash of DeploymentSpec.PodTemplateSpec.
 	// No label is added if this is set to empty string.
 	UniqueLabelKey string `json:"uniqueLabelKey,omitempty"`
+
+	// Indicates that the deployment is paused and will not be processed by the
+	// deployment controller.
+	Paused bool `json:"paused,omitempty"`
 }
 
 const (

pkg/apis/extensions/v1beta1/conversion.go

@@ -262,6 +262,7 @@ func Convert_extensions_DeploymentSpec_To_v1beta1_DeploymentSpec(in *extensions.
 	}
 	out.UniqueLabelKey = new(string)
 	*out.UniqueLabelKey = in.UniqueLabelKey
+	out.Paused = in.Paused
 	return nil
 }
 
@@ -289,6 +290,7 @@ func Convert_v1beta1_DeploymentSpec_To_extensions_DeploymentSpec(in *DeploymentS
 	if in.UniqueLabelKey != nil {
 		out.UniqueLabelKey = *in.UniqueLabelKey
 	}
+	out.Paused = in.Paused
 	return nil
 }
 

pkg/apis/extensions/v1beta1/types.go

@@ -213,6 +213,10 @@ type DeploymentSpec struct {
 	// Value of this key is hash of DeploymentSpec.PodTemplateSpec.
 	// No label is added if this is set to empty string.
 	UniqueLabelKey *string `json:"uniqueLabelKey,omitempty"`
+
+	// Indicates that the deployment is paused and will not be processed by the
+	// deployment controller.
+	Paused bool `json:"paused,omitempty"`
 }
 
 const (

pkg/controller/deployment/deployment_controller.go

@@ -410,6 +410,11 @@ func (dc *DeploymentController) syncDeployment(key string) error {
 		return nil
 	}
 
+	if d.Spec.Paused {
+		// Ignore paused deployments
+		glog.V(4).Infof("Ignoring paused deployment %s/%s", d.Namespace, d.Name)
+		return nil
+	}
 	switch d.Spec.Strategy.Type {
 	case extensions.RecreateDeploymentStrategyType:
 		return dc.syncRecreateDeployment(d)

pkg/registry/deployment/etcd/etcd_test.go

@@ -75,21 +75,6 @@ func validNewDeployment() *extensions.Deployment {
 
 var validDeployment = *validNewDeployment()
 
-func validNewScale() *extensions.Scale {
-	return &extensions.Scale{
-		ObjectMeta: api.ObjectMeta{Name: name, Namespace: namespace},
-		Spec: extensions.ScaleSpec{
-			Replicas: validDeployment.Spec.Replicas,
-		},
-		Status: extensions.ScaleStatus{
-			Replicas: validDeployment.Status.Replicas,
-			Selector: validDeployment.Spec.Template.Labels,
-		},
-	}
-}
-
-var validScale = *validNewScale()
-
 func TestCreate(t *testing.T) {
 	storage, server := newStorage(t)
 	defer server.Terminate(t)
@@ -192,6 +177,21 @@ func TestWatch(t *testing.T) {
 	)
 }
 
+func validNewScale() *extensions.Scale {
+	return &extensions.Scale{
+		ObjectMeta: api.ObjectMeta{Name: name, Namespace: namespace},
+		Spec: extensions.ScaleSpec{
+			Replicas: validDeployment.Spec.Replicas,
+		},
+		Status: extensions.ScaleStatus{
+			Replicas: validDeployment.Status.Replicas,
+			Selector: validDeployment.Spec.Template.Labels,
+		},
+	}
+}
+
+var validScale = *validNewScale()
+
 func TestScaleGet(t *testing.T) {
 	storage, server := newStorage(t)
 	defer server.Terminate(t)
@@ -204,10 +204,10 @@ func TestScaleGet(t *testing.T) {
 
 	expect := &validScale
 	obj, err := storage.Scale.Get(ctx, name)
-	scale := obj.(*extensions.Scale)
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}
+	scale := obj.(*extensions.Scale)
 	if e, a := expect, scale; !api.Semantic.DeepDerivative(e, a) {
 		t.Errorf("unexpected scale: %s", util.ObjectDiff(e, a))
 	}
@@ -216,6 +216,7 @@ func TestScaleGet(t *testing.T) {
 func TestScaleUpdate(t *testing.T) {
 	storage, server := newStorage(t)
 	defer server.Terminate(t)
+
 	ctx := api.WithNamespace(api.NewContext(), namespace)
 	key := etcdtest.AddPrefix("/deployments/" + namespace + "/" + name)
 	if err := storage.Deployment.Storage.Set(ctx, key, &validDeployment, nil, 0); err != nil {
@@ -232,12 +233,11 @@ func TestScaleUpdate(t *testing.T) {
 	if _, _, err := storage.Scale.Update(ctx, &update); err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}
-	obj, err := storage.Scale.Get(ctx, name)
+	obj, err := storage.Deployment.Get(ctx, name)
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}
-
-	deployment := obj.(*extensions.Scale)
+	deployment := obj.(*extensions.Deployment)
 	if deployment.Spec.Replicas != replicas {
 		t.Errorf("wrong replicas count expected: %d got: %d", replicas, deployment.Spec.Replicas)
 	}

test/e2e/deployment.go

@@ -18,9 +18,11 @@ package e2e
 
 import (
 	"fmt"
+	"time"
 
 	"k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/apis/extensions"
+	"k8s.io/kubernetes/pkg/labels"
 	deploymentutil "k8s.io/kubernetes/pkg/util/deployment"
 	"k8s.io/kubernetes/pkg/util/intstr"
 
@@ -46,6 +48,9 @@ var _ = Describe("Deployment", func() {
 	It("deployment should support rollover [Flaky]", func() {
 		testRolloverDeployment(f)
 	})
+	It("paused deployment should be ignored by the controller", func() {
+		testPausedDeployment(f)
+	})
 })
 
 func newRC(rcName string, replicas int, rcPodLabels map[string]string, imageName string, image string) *api.ReplicationController {
@@ -390,3 +395,74 @@ func testRolloverDeployment(f *Framework) {
 	newRC, err = deploymentutil.GetNewRC(*deployment, c)
 	Expect(newRC.Spec.Template.Spec.Containers[0].Image).Should(Equal(updatedDeploymentImage))
 }
+
+func testPausedDeployment(f *Framework) {
+	ns := f.Namespace.Name
+	c := f.Client
+	deploymentName := "nginx"
+	podLabels := map[string]string{"name": "nginx"}
+	d := newDeployment(deploymentName, 1, podLabels, "nginx", "nginx", extensions.RollingUpdateDeploymentStrategyType)
+	d.Spec.Paused = true
+	Logf("Creating paused deployment %s", deploymentName)
+	_, err := c.Deployments(ns).Create(d)
+	Expect(err).NotTo(HaveOccurred())
+	defer func() {
+		_, err := c.Deployments(ns).Get(deploymentName)
+		Expect(err).NotTo(HaveOccurred())
+		Logf("deleting deployment %s", deploymentName)
+		Expect(c.Deployments(ns).Delete(deploymentName, nil)).NotTo(HaveOccurred())
+	}()
+	// Check that deployment is created fine.
+	deployment, err := c.Deployments(ns).Get(deploymentName)
+	Expect(err).NotTo(HaveOccurred())
+
+	// Verify that there is no latest state realized for the new deployment.
+	rc, err := deploymentutil.GetNewRC(*deployment, c)
+	Expect(err).NotTo(HaveOccurred())
+	if rc != nil {
+		err = fmt.Errorf("unexpected new rc/%s for deployment/%s", rc.Name, deployment.Name)
+		Expect(err).NotTo(HaveOccurred())
+	}
+
+	// Update the deployment to run
+	deployment.Spec.Paused = false
+	deployment, err = c.Deployments(ns).Update(deployment)
+	Expect(err).NotTo(HaveOccurred())
+
+	opts := api.ListOptions{LabelSelector: labels.Set(deployment.Spec.Selector).AsSelector()}
+	w, err := c.ReplicationControllers(ns).Watch(opts)
+	Expect(err).NotTo(HaveOccurred())
+
+	select {
+	case <-w.ResultChan():
+		// this is it
+	case <-time.After(time.Minute):
+		err = fmt.Errorf("expected a new rc to be created")
+		Expect(err).NotTo(HaveOccurred())
+	}
+
+	// Pause the deployment and delete the replication controller.
+	// The paused deployment shouldn't recreate a new one.
+	deployment.Spec.Paused = true
+	deployment.ResourceVersion = ""
+	deployment, err = c.Deployments(ns).Update(deployment)
+	Expect(err).NotTo(HaveOccurred())
+
+	newRC, err := deploymentutil.GetNewRC(*deployment, c)
+	Expect(err).NotTo(HaveOccurred())
+	Expect(c.ReplicationControllers(ns).Delete(newRC.Name)).NotTo(HaveOccurred())
+
+	deployment, err = c.Deployments(ns).Get(deploymentName)
+	Expect(err).NotTo(HaveOccurred())
+
+	if !deployment.Spec.Paused {
+		err = fmt.Errorf("deployment %q should be paused", deployment.Name)
+		Expect(err).NotTo(HaveOccurred())
+	}
+	shouldBeNil, err := deploymentutil.GetNewRC(*deployment, c)
+	Expect(err).NotTo(HaveOccurred())
+	if shouldBeNil != nil {
+		err = fmt.Errorf("deployment %q shouldn't have a rc but there is %q", deployment.Name, shouldBeNil.Name)
+		Expect(err).NotTo(HaveOccurred())
+	}
+}