Revert #13052

pkg/kubelet/dockertools/manager.go

@@ -290,58 +290,16 @@ type containerStatusResult struct {
 	err    error
 }
 
-const podIPDownwardAPISelector = "status.podIP"
-
-// podDependsOnIP returns whether any containers in a pod depend on using the pod IP via
-// the downward API.
-func podDependsOnPodIP(pod *api.Pod) bool {
-	for _, container := range pod.Spec.Containers {
-		for _, env := range container.Env {
-			if env.ValueFrom != nil &&
-				env.ValueFrom.FieldRef != nil &&
-				env.ValueFrom.FieldRef.FieldPath == podIPDownwardAPISelector {
-				return true
-			}
-		}
-	}
-
-	return false
-}
-
-// determineContainerIP determines the IP address of the given container.  It is expected
-// that the container passed is the infrastructure container of a pod and the responsibility
-// of the caller to ensure that the correct container is passed.
-func (dm *DockerManager) determineContainerIP(podNamespace, podName string, container *docker.Container) string {
-	result := ""
-
-	if container.NetworkSettings != nil {
-		result = container.NetworkSettings.IPAddress
-	}
-
-	if dm.networkPlugin.Name() != network.DefaultPluginName {
-		netStatus, err := dm.networkPlugin.Status(podNamespace, podName, kubeletTypes.DockerID(container.ID))
-		if err != nil {
-			glog.Errorf("NetworkPlugin %s failed on the status hook for pod '%s' - %v", dm.networkPlugin.Name(), podName, err)
-		} else if netStatus != nil {
-			result = netStatus.IP.String()
-		}
-	}
-
-	return result
-}
-
 func (dm *DockerManager) inspectContainer(dockerID, containerName, tPath string, pod *api.Pod) *containerStatusResult {
 	result := containerStatusResult{api.ContainerStatus{}, "", nil}
 
 	inspectResult, err := dm.client.InspectContainer(dockerID)
+
 	if err != nil {
 		result.err = err
 		return &result
 	}
-	// NOTE (pmorie): this is a seriously fishy if statement.  A nil result from InspectContainer seems like it should
-	// always be paired with a non-nil error in the result of InspectContainer.
 	if inspectResult == nil {
-		glog.Error("Received a nil result from InspectContainer without receiving an error")
 		// Why did we not get an error?
 		return &result
 	}
@@ -359,7 +317,18 @@ func (dm *DockerManager) inspectContainer(dockerID, containerName, tPath string,
 			StartedAt: util.NewTime(inspectResult.State.StartedAt),
 		}
 		if containerName == PodInfraContainerName {
-			result.ip = dm.determineContainerIP(pod.Namespace, pod.Name, inspectResult)
+			if inspectResult.NetworkSettings != nil {
+				result.ip = inspectResult.NetworkSettings.IPAddress
+			}
+			// override the above if a network plugin exists
+			if dm.networkPlugin.Name() != network.DefaultPluginName {
+				netStatus, err := dm.networkPlugin.Status(pod.Namespace, pod.Name, kubeletTypes.DockerID(dockerID))
+				if err != nil {
+					glog.Errorf("NetworkPlugin %s failed on the status hook for pod '%s' - %v", dm.networkPlugin.Name(), pod.Name, err)
+				} else if netStatus != nil {
+					result.ip = netStatus.IP.String()
+				}
+			}
 		}
 	} else if !inspectResult.State.FinishedAt.IsZero() {
 		reason := ""
@@ -1391,7 +1360,7 @@ func containerAndPodFromLabels(inspect *docker.Container) (pod *api.Pod, contain
 }
 
 // Run a single container from a pod. Returns the docker container ID
-func (dm *DockerManager) runContainerInPod(pod *api.Pod, container *api.Container, netMode, ipcMode string) (kubeletTypes.DockerID, *docker.Container, error) {
+func (dm *DockerManager) runContainerInPod(pod *api.Pod, container *api.Container, netMode, ipcMode string) (kubeletTypes.DockerID, error) {
 	start := time.Now()
 	defer func() {
 		metrics.ContainerManagerLatency.WithLabelValues("runContainerInPod").Observe(metrics.SinceInMicroseconds(start))
@@ -1404,7 +1373,7 @@ func (dm *DockerManager) runContainerInPod(pod *api.Pod, container *api.Containe
 
 	opts, err := dm.generator.GenerateRunContainerOptions(pod, container)
 	if err != nil {
-		return "", nil, err
+		return "", err
 	}
 
 	utsMode := ""
@@ -1413,7 +1382,7 @@ func (dm *DockerManager) runContainerInPod(pod *api.Pod, container *api.Containe
 	}
 	id, err := dm.runContainer(pod, container, opts, ref, netMode, ipcMode, utsMode)
 	if err != nil {
-		return "", nil, err
+		return "", err
 	}
 
 	// Remember this reference so we can report events about this container
@@ -1425,7 +1394,7 @@ func (dm *DockerManager) runContainerInPod(pod *api.Pod, container *api.Containe
 		handlerErr := dm.runner.Run(id, pod, container, container.Lifecycle.PostStart)
 		if handlerErr != nil {
 			dm.KillContainerInPod(types.UID(id), container, pod)
-			return kubeletTypes.DockerID(""), nil, fmt.Errorf("failed to call event handler: %v", handlerErr)
+			return kubeletTypes.DockerID(""), fmt.Errorf("failed to call event handler: %v", handlerErr)
 		}
 	}
 
@@ -1443,11 +1412,11 @@ func (dm *DockerManager) runContainerInPod(pod *api.Pod, container *api.Containe
 	// Container information is used in adjusting OOM scores and adding ndots.
 	containerInfo, err := dm.client.InspectContainer(string(id))
 	if err != nil {
-		return "", nil, err
+		return "", err
 	}
 	// Ensure the PID actually exists, else we'll move ourselves.
 	if containerInfo.State.Pid == 0 {
-		return "", nil, fmt.Errorf("failed to get init PID for Docker container %q", string(id))
+		return "", fmt.Errorf("failed to get init PID for Docker container %q", string(id))
 	}
 
 	// Set OOM score of the container based on the priority of the container.
@@ -1462,10 +1431,10 @@ func (dm *DockerManager) runContainerInPod(pod *api.Pod, container *api.Containe
 	}
 	cgroupName, err := dm.procFs.GetFullContainerName(containerInfo.State.Pid)
 	if err != nil {
-		return "", nil, err
+		return "", err
 	}
 	if err = dm.oomAdjuster.ApplyOomScoreAdjContainer(cgroupName, oomScoreAdj, 5); err != nil {
-		return "", nil, err
+		return "", err
 	}
 
 	// currently, Docker does not have a flag by which the ndots option can be passed.
@@ -1478,7 +1447,7 @@ func (dm *DockerManager) runContainerInPod(pod *api.Pod, container *api.Containe
 		err = addNDotsOption(containerInfo.ResolvConfPath)
 	}
 
-	return kubeletTypes.DockerID(id), containerInfo, err
+	return kubeletTypes.DockerID(id), err
 }
 
 func addNDotsOption(resolvFilePath string) error {
@@ -1512,7 +1481,7 @@ func appendToFile(filePath, stringToAppend string) error {
 }
 
 // createPodInfraContainer starts the pod infra container for a pod. Returns the docker container ID of the newly created container.
-func (dm *DockerManager) createPodInfraContainer(pod *api.Pod) (kubeletTypes.DockerID, *docker.Container, error) {
+func (dm *DockerManager) createPodInfraContainer(pod *api.Pod) (kubeletTypes.DockerID, error) {
 	start := time.Now()
 	defer func() {
 		metrics.ContainerManagerLatency.WithLabelValues("createPodInfraContainer").Observe(metrics.SinceInMicroseconds(start))
@@ -1540,15 +1509,15 @@ func (dm *DockerManager) createPodInfraContainer(pod *api.Pod) (kubeletTypes.Doc
 
 	// No pod secrets for the infra container.
 	if err := dm.imagePuller.PullImage(pod, container, nil); err != nil {
-		return "", nil, err
+		return "", err
 	}
 
-	id, dockerContainer, err := dm.runContainerInPod(pod, container, netNamespace, "")
+	id, err := dm.runContainerInPod(pod, container, netNamespace, "")
 	if err != nil {
-		return "", nil, err
+		return "", err
 	}
 
-	return id, dockerContainer, nil
+	return id, nil
 }
 
 // TODO(vmarmol): This will soon be made non-public when its only use is internal.
@@ -1748,21 +1717,16 @@ func (dm *DockerManager) SyncPod(pod *api.Pod, runningPod kubecontainer.Pod, pod
 	podInfraContainerID := containerChanges.InfraContainerId
 	if containerChanges.StartInfraContainer && (len(containerChanges.ContainersToStart) > 0) {
 		glog.V(4).Infof("Creating pod infra container for %q", podFullName)
-		podInfraContainerID, podInfraContainer, err := dm.createPodInfraContainer(pod)
-		if err == nil {
+		podInfraContainerID, err = dm.createPodInfraContainer(pod)
+
 		// Call the networking plugin
+		if err == nil {
 			err = dm.networkPlugin.SetUpPod(pod.Namespace, pod.Name, podInfraContainerID)
 		}
 		if err != nil {
 			glog.Errorf("Failed to create pod infra container: %v; Skipping pod %q", err, podFullName)
 			return err
 		}
-
-		if podDependsOnPodIP(pod) {
-			// Find the pod IP after starting the infra container in order to expose
-			// it safely via the downward API without a race.
-			pod.Status.PodIP = dm.determineContainerIP(pod.Name, pod.Namespace, podInfraContainer)
-		}
 	}
 
 	// Start everything
@@ -1794,7 +1758,7 @@ func (dm *DockerManager) SyncPod(pod *api.Pod, runningPod kubecontainer.Pod, pod
 
 		// TODO(dawnchen): Check RestartPolicy.DelaySeconds before restart a container
 		namespaceMode := fmt.Sprintf("container:%v", podInfraContainerID)
-		_, _, err = dm.runContainerInPod(pod, container, namespaceMode, namespaceMode)
+		_, err = dm.runContainerInPod(pod, container, namespaceMode, namespaceMode)
 		dm.updateReasonCache(pod, container, err)
 		if err != nil {
 			// TODO(bburns) : Perhaps blacklist a container after N failures?

pkg/kubelet/dockertools/manager_test.go

@@ -2334,62 +2334,3 @@ func TestGetUidFromUser(t *testing.T) {
 		}
 	}
 }
-
-func TestPodDependsOnPodIP(t *testing.T) {
-	tests := []struct {
-		name     string
-		expected bool
-		env      api.EnvVar
-	}{
-		{
-			name:     "depends on pod IP",
-			expected: true,
-			env: api.EnvVar{
-				Name: "POD_IP",
-				ValueFrom: &api.EnvVarSource{
-					FieldRef: &api.ObjectFieldSelector{
-						APIVersion: testapi.Default.Version(),
-						FieldPath:  "status.podIP",
-					},
-				},
-			},
-		},
-		{
-			name:     "literal value",
-			expected: false,
-			env: api.EnvVar{
-				Name:  "SOME_VAR",
-				Value: "foo",
-			},
-		},
-		{
-			name:     "other downward api field",
-			expected: false,
-			env: api.EnvVar{
-				Name: "POD_NAME",
-				ValueFrom: &api.EnvVarSource{
-					FieldRef: &api.ObjectFieldSelector{
-						APIVersion: testapi.Default.Version(),
-						FieldPath:  "metadata.name",
-					},
-				},
-			},
-		},
-	}
-
-	for _, tc := range tests {
-		pod := &api.Pod{
-			Spec: api.PodSpec{
-				Containers: []api.Container{
-					{Env: []api.EnvVar{tc.env}},
-				},
-			},
-		}
-
-		result := podDependsOnPodIP(pod)
-		if e, a := tc.expected, result; e != a {
-			t.Errorf("%v: Unexpected result; expected %v, got %v", tc.name, e, a)
-		}
-	}
-
-}

test/e2e/docker_containers.go

@@ -45,7 +45,7 @@ var _ = Describe("Docker Containers", func() {
 	})
 
 	It("should use the image defaults if command and args are blank", func() {
-		testContainerOutput("use defaults", c, entrypointTestPod(), 0, []string{
+		testContainerOutputInNamespace("use defaults", c, entrypointTestPod(), 0, []string{
 			"[/ep default arguments]",
 		}, ns)
 	})
@@ -54,7 +54,7 @@ var _ = Describe("Docker Containers", func() {
 		pod := entrypointTestPod()
 		pod.Spec.Containers[0].Args = []string{"override", "arguments"}
 
-		testContainerOutput("override arguments", c, pod, 0, []string{
+		testContainerOutputInNamespace("override arguments", c, pod, 0, []string{
 			"[/ep override arguments]",
 		}, ns)
 	})
@@ -65,7 +65,7 @@ var _ = Describe("Docker Containers", func() {
 		pod := entrypointTestPod()
 		pod.Spec.Containers[0].Command = []string{"/ep-2"}
 
-		testContainerOutput("override command", c, pod, 0, []string{
+		testContainerOutputInNamespace("override command", c, pod, 0, []string{
 			"[/ep-2]",
 		}, ns)
 	})
@@ -75,7 +75,7 @@ var _ = Describe("Docker Containers", func() {
 		pod.Spec.Containers[0].Command = []string{"/ep-2"}
 		pod.Spec.Containers[0].Args = []string{"override", "arguments"}
 
-		testContainerOutput("override all", c, pod, 0, []string{
+		testContainerOutputInNamespace("override all", c, pod, 0, []string{
 			"[/ep-2 override arguments]",
 		}, ns)
 	})

test/e2e/downward_api.go

@@ -30,7 +30,18 @@ var _ = Describe("Downward API", func() {
 
 	It("should provide pod name and namespace as env vars", func() {
 		podName := "downward-api-" + string(util.NewUUID())
-		env := []api.EnvVar{
+		pod := &api.Pod{
+			ObjectMeta: api.ObjectMeta{
+				Name:   podName,
+				Labels: map[string]string{"name": podName},
+			},
+			Spec: api.PodSpec{
+				Containers: []api.Container{
+					{
+						Name:    "dapi-container",
+						Image:   "gcr.io/google_containers/busybox",
+						Command: []string{"sh", "-c", "env"},
+						Env: []api.EnvVar{
 							{
 								Name: "POD_NAME",
 								ValueFrom: &api.EnvVarSource{
@@ -49,66 +60,16 @@ var _ = Describe("Downward API", func() {
 									},
 								},
 							},
-			{
-				Name: "POD_IP",
-				ValueFrom: &api.EnvVarSource{
-					FieldRef: &api.ObjectFieldSelector{
-						APIVersion: "v1",
-						FieldPath:  "status.podIP",
 						},
 					},
 				},
+				RestartPolicy: api.RestartPolicyNever,
+			},
 		}
 
-		expectations := []string{
+		framework.TestContainerOutput("downward api env vars", pod, 0, []string{
 			fmt.Sprintf("POD_NAME=%v", podName),
 			fmt.Sprintf("POD_NAMESPACE=%v", framework.Namespace.Name),
-		}
-
-		testDownwardAPI(framework, podName, env, expectations)
 		})
-
-	It("should provide pod IP as an env var", func() {
-		podName := "downward-api-" + string(util.NewUUID())
-		env := []api.EnvVar{
-			{
-				Name: "POD_IP",
-				ValueFrom: &api.EnvVarSource{
-					FieldRef: &api.ObjectFieldSelector{
-						APIVersion: "v1",
-						FieldPath:  "status.podIP",
-					},
-				},
-			},
-		}
-
-		expectations := []string{
-			"POD_IP=(?:\\d+)\\.(?:\\d+)\\.(?:\\d+)\\.(?:\\d+)",
-		}
-
-		testDownwardAPI(framework, podName, env, expectations)
 	})
-
 })
-
-func testDownwardAPI(framework *Framework, podName string, env []api.EnvVar, expectations []string) {
-	pod := &api.Pod{
-		ObjectMeta: api.ObjectMeta{
-			Name:   podName,
-			Labels: map[string]string{"name": podName},
-		},
-		Spec: api.PodSpec{
-			Containers: []api.Container{
-				{
-					Name:    "dapi-container",
-					Image:   "gcr.io/google_containers/busybox",
-					Command: []string{"sh", "-c", "env"},
-					Env:     env,
-				},
-			},
-			RestartPolicy: api.RestartPolicyNever,
-		},
-	}
-
-	framework.TestContainerOutputRegexp("downward api env vars", pod, 0, expectations)
-}

test/e2e/downwardapi_volume.go

@@ -86,7 +86,7 @@ var _ = Describe("Downwar dAPI volume", func() {
 				RestartPolicy: api.RestartPolicyNever,
 			},
 		}
-		testContainerOutput("downward API volume plugin", f.Client, pod, 0, []string{
+		testContainerOutputInNamespace("downward API volume plugin", f.Client, pod, 0, []string{
 			fmt.Sprintf("cluster=\"rack10\"\n"),
 			fmt.Sprintf("builder=\"john-doe\"\n"),
 			fmt.Sprintf("%s\n", podName),

test/e2e/framework.go

@@ -112,12 +112,7 @@ func (f *Framework) WaitForPodRunning(podName string) error {
 
 // Runs the given pod and verifies that the output of exact container matches the desired output.
 func (f *Framework) TestContainerOutput(scenarioName string, pod *api.Pod, containerIndex int, expectedOutput []string) {
-	testContainerOutput(scenarioName, f.Client, pod, containerIndex, expectedOutput, f.Namespace.Name)
-}
-
-// Runs the given pod and verifies that the output of exact container matches the desired regexps.
-func (f *Framework) TestContainerOutputRegexp(scenarioName string, pod *api.Pod, containerIndex int, expectedOutput []string) {
-	testContainerOutputRegexp(scenarioName, f.Client, pod, containerIndex, expectedOutput, f.Namespace.Name)
+	testContainerOutputInNamespace(scenarioName, f.Client, pod, containerIndex, expectedOutput, f.Namespace.Name)
 }
 
 // WaitForAnEndpoint waits for at least one endpoint to become available in the

test/e2e/host_path.go

@@ -67,7 +67,7 @@ var _ = Describe("hostPath", func() {
 			fmt.Sprintf("--fs_type=%v", volumePath),
 			fmt.Sprintf("--file_mode=%v", volumePath),
 		}
-		testContainerOutput("hostPath mode", c, pod, 0, []string{
+		testContainerOutputInNamespace("hostPath mode", c, pod, 0, []string{
 			"mode of file \"/test-volume\": dtrwxrwxrwx", // we expect the sticky bit (mode flag t) to be set for the dir
 		},
 			namespace.Name)
@@ -93,7 +93,7 @@ var _ = Describe("hostPath", func() {
 		}
 		//Read the content of the file with the second container to
 		//verify volumes  being shared properly among continers within the pod.
-		testContainerOutput("hostPath r/w", c, pod, 1, []string{
+		testContainerOutputInNamespace("hostPath r/w", c, pod, 1, []string{
 			"content of file \"/test-volume/test-file\": mount-tester new file",
 		}, namespace.Name,
 		)

test/e2e/secrets.go

@@ -92,7 +92,7 @@ var _ = Describe("Secrets", func() {
 			},
 		}
 
-		testContainerOutput("consume secrets", f.Client, pod, 0, []string{
+		testContainerOutputInNamespace("consume secrets", f.Client, pod, 0, []string{
 			"content of file \"/etc/secret-volume/data-1\": value-1",
 			"mode of file \"/etc/secret-volume/data-1\": -r--r--r--",
 		}, f.Namespace.Name)

test/e2e/util.go

@@ -55,8 +55,6 @@ import (
 
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
-
-	gomegatypes "github.com/onsi/gomega/types"
 )
 
 const (
@@ -1024,29 +1022,9 @@ func tryKill(cmd *exec.Cmd) {
 }
 
 // testContainerOutputInNamespace runs the given pod in the given namespace and waits
-// for all of the containers in the podSpec to move into the 'Success' status, and tests
-// the specified container log against the given expected output using a substring matcher.
-func testContainerOutput(scenarioName string, c *client.Client, pod *api.Pod, containerIndex int, expectedOutput []string, ns string) {
-	testContainerOutputMatcher(scenarioName, c, pod, containerIndex, expectedOutput, ns, ContainSubstring)
-}
-
-// testContainerOutputInNamespace runs the given pod in the given namespace and waits
-// for all of the containers in the podSpec to move into the 'Success' status, and tests
-// the specified container log against the given expected output using a regexp matcher.
-func testContainerOutputRegexp(scenarioName string, c *client.Client, pod *api.Pod, containerIndex int, expectedOutput []string, ns string) {
-	testContainerOutputMatcher(scenarioName, c, pod, containerIndex, expectedOutput, ns, MatchRegexp)
-}
-
-// testContainerOutputInNamespace runs the given pod in the given namespace and waits
-// for all of the containers in the podSpec to move into the 'Success' status, and tests
-// the specified container log against the given expected output using the given matcher.
-func testContainerOutputMatcher(scenarioName string,
-	c *client.Client,
-	pod *api.Pod,
-	containerIndex int,
-	expectedOutput []string, ns string,
-	matcher func(string, ...interface{}) gomegatypes.GomegaMatcher) {
-
+// for all of the containers in the podSpec to move into the 'Success' status.  It retrieves
+// the exact container log and searches for lines of expected output.
+func testContainerOutputInNamespace(scenarioName string, c *client.Client, pod *api.Pod, containerIndex int, expectedOutput []string, ns string) {
 	By(fmt.Sprintf("Creating a pod to test %v", scenarioName))
 
 	defer c.Pods(ns).Delete(pod.Name, api.NewDeleteOptions(0))
@@ -1102,7 +1080,7 @@ func testContainerOutputMatcher(scenarioName string,
 	}
 
 	for _, m := range expectedOutput {
-		Expect(string(logs)).To(matcher(m), "%q in container output", m)
+		Expect(string(logs)).To(ContainSubstring(m), "%q in container output", m)
 	}
 }