Passing pod UUID to Kubelet.

pkg/api/types.go

@@ -54,7 +54,11 @@ type ContainerManifest struct {
 	Version string `yaml:"version" json:"version"`
 	// Required: This must be a DNS_SUBDOMAIN.
 	// TODO: ID on Manifest is deprecated and will be removed in the future.
-	ID         string      `yaml:"id" json:"id"`
+	ID string `yaml:"id" json:"id"`
+	// TODO: UUID on Manifest is deprecated in the future once we are done
+	// with the API refactoring. It is required for now to determine the instance
+	// of a Pod.
+	UUID       string      `yaml:"uuid,omitempty" json:"uuid,omitempty"`
 	Volumes    []Volume    `yaml:"volumes" json:"volumes"`
 	Containers []Container `yaml:"containers" json:"containers"`
 }

pkg/api/v1beta1/types.go

@@ -54,7 +54,11 @@ type ContainerManifest struct {
 	Version string `yaml:"version" json:"version"`
 	// Required: This must be a DNS_SUBDOMAIN.
 	// TODO: ID on Manifest is deprecated and will be removed in the future.
-	ID         string      `yaml:"id" json:"id"`
+	ID string `yaml:"id" json:"id"`
+	// TODO: UUID on Manifext is deprecated in the future once we are done
+	// with the API refactory. It is required for now to determine the instance
+	// of a Pod.
+	UUID       string      `yaml:"uuid,omitempty" json:"uuid,omitempty"`
 	Volumes    []Volume    `yaml:"volumes" json:"volumes"`
 	Containers []Container `yaml:"containers" json:"containers"`
 }

pkg/health/exec.go

@@ -27,7 +27,7 @@ import (
 const defaultHealthyRegex = "^OK$"
 
 type CommandRunner interface {
-	RunInContainer(podFullName, containerName string, cmd []string) ([]byte, error)
+	RunInContainer(podFullName, uuid, containerName string, cmd []string) ([]byte, error)
 }
 
 type ExecHealthChecker struct {
@@ -47,7 +47,7 @@ func (e *ExecHealthChecker) HealthCheck(podFullName string, currentState api.Pod
 	if container.LivenessProbe.Exec == nil {
 		return Unknown, fmt.Errorf("Missing exec parameters")
 	}
-	data, err := e.runner.RunInContainer(podFullName, container.Name, container.LivenessProbe.Exec.Command)
+	data, err := e.runner.RunInContainer(podFullName, currentState.Manifest.UUID, container.Name, container.LivenessProbe.Exec.Command)
 	glog.V(1).Infof("container %s failed health check: %s", podFullName, string(data))
 	if err != nil {
 		if IsExitError(err) {

pkg/health/exec_test.go

@@ -31,7 +31,7 @@ type FakeExec struct {
 	err error
 }
 
-func (f *FakeExec) RunInContainer(podFullName, container string, cmd []string) ([]byte, error) {
+func (f *FakeExec) RunInContainer(podFullName, uuid, container string, cmd []string) ([]byte, error) {
 	f.cmd = cmd
 	return f.out, f.err
 }

pkg/kubelet/config/etcd.go

@@ -99,7 +99,9 @@ func eventToPods(ev watch.Event) ([]kubelet.Pod, error) {
 		if name == "" {
 			name = fmt.Sprintf("%d", i+1)
 		}
-		pods = append(pods, kubelet.Pod{Name: name, Manifest: manifest})
+		pods = append(pods, kubelet.Pod{
+			Name:     name,
+			Manifest: manifest})
 	}
 
 	return pods, nil

pkg/kubelet/docker.go

@@ -109,21 +109,24 @@ func (p dockerPuller) Pull(image string) error {
 // DockerContainers is a map of containers
 type DockerContainers map[DockerID]*docker.APIContainers
 
-func (c DockerContainers) FindPodContainer(podFullName, containerName string) (*docker.APIContainers, bool, uint64) {
+func (c DockerContainers) FindPodContainer(podFullName, uuid, containerName string) (*docker.APIContainers, bool, uint64) {
 	for _, dockerContainer := range c {
-		dockerManifestID, dockerContainerName, hash := parseDockerName(dockerContainer.Names[0])
+		dockerManifestID, dockerUUID, dockerContainerName, hash := parseDockerName(dockerContainer.Names[0])
-		if dockerManifestID == podFullName && dockerContainerName == containerName {
+		if dockerManifestID == podFullName &&
+			(uuid == "" || dockerUUID == uuid) &&
+			dockerContainerName == containerName {
 			return dockerContainer, true, hash
 		}
 	}
 	return nil, false, 0
 }
 
+// Note, this might return containers belong to a different Pod instance with the same name
 func (c DockerContainers) FindContainersByPodFullName(podFullName string) map[string]*docker.APIContainers {
 	containers := make(map[string]*docker.APIContainers)
 
 	for _, dockerContainer := range c {
-		dockerManifestID, dockerContainerName, _ := parseDockerName(dockerContainer.Names[0])
+		dockerManifestID, _, dockerContainerName, _ := parseDockerName(dockerContainer.Names[0])
 		if dockerManifestID == podFullName {
 			containers[dockerContainerName] = dockerContainer
 		}
@@ -154,7 +157,7 @@ func getKubeletDockerContainers(client DockerInterface) (DockerContainers, error
 var ErrNoContainersInPod = errors.New("no containers exist for this pod")
 
 // GetDockerPodInfo returns docker info for all containers in the pod/manifest.
-func getDockerPodInfo(client DockerInterface, podFullName string) (api.PodInfo, error) {
+func getDockerPodInfo(client DockerInterface, podFullName, uuid string) (api.PodInfo, error) {
 	info := api.PodInfo{}
 
 	containers, err := client.ListContainers(docker.ListContainersOptions{})
@@ -163,10 +166,13 @@ func getDockerPodInfo(client DockerInterface, podFullName string) (api.PodInfo,
 	}
 
 	for _, value := range containers {
-		dockerManifestID, dockerContainerName, _ := parseDockerName(value.Names[0])
+		dockerManifestID, dockerUUID, dockerContainerName, _ := parseDockerName(value.Names[0])
 		if dockerManifestID != podFullName {
 			continue
 		}
+		if uuid != "" && dockerUUID != uuid {
+			continue
+		}
 		inspectResult, err := client.InspectContainer(value.ID)
 		if err != nil {
 			return nil, err
@@ -211,12 +217,25 @@ func hashContainer(container *api.Container) uint64 {
 func buildDockerName(pod *Pod, container *api.Container) string {
 	containerName := escapeDash(container.Name) + "." + strconv.FormatUint(hashContainer(container), 16)
 	// Note, manifest.ID could be blank.
-	return fmt.Sprintf("%s--%s--%s--%08x", containerNamePrefix, containerName, escapeDash(GetPodFullName(pod)), rand.Uint32())
+	if len(pod.Manifest.UUID) == 0 {
+		return fmt.Sprintf("%s--%s--%s--%08x",
+			containerNamePrefix,
+			containerName,
+			escapeDash(GetPodFullName(pod)),
+			rand.Uint32())
+	} else {
+		return fmt.Sprintf("%s--%s--%s--%s--%08x",
+			containerNamePrefix,
+			containerName,
+			escapeDash(GetPodFullName(pod)),
+			escapeDash(pod.Manifest.UUID),
+			rand.Uint32())
+	}
 }
 
 // Upacks a container name, returning the pod full name and container name we would have used to
 // construct the docker name. If the docker name isn't one we created, we may return empty strings.
-func parseDockerName(name string) (podFullName, containerName string, hash uint64) {
+func parseDockerName(name string) (podFullName, uuid, containerName string, hash uint64) {
 	// For some reason docker appears to be appending '/' to names.
 	// If it's there, strip it.
 	if name[0] == '/' {
@@ -240,11 +259,14 @@ func parseDockerName(name string) (podFullName, containerName string, hash uint6
 	if len(parts) > 2 {
 		podFullName = unescapeDash(parts[2])
 	}
+	if len(parts) > 4 {
+		uuid = unescapeDash(parts[3])
+	}
 	return
 }
 
 // Parses image name including a tag and returns image name and tag.
-// TODO: Future Docker versions can parse the tag on daemon side, see:
+// TODO: Future Docker versions can parse the tag on daemon side, see
 // https://github.com/dotcloud/docker/issues/6876
 // So this can be deprecated at some point.
 func parseImageName(image string) (string, string) {

pkg/kubelet/handlers.go

@@ -30,8 +30,8 @@ type execActionHandler struct {
 	kubelet *Kubelet
 }
 
-func (e *execActionHandler) Run(podFullName string, container *api.Container, handler *api.Handler) error {
+func (e *execActionHandler) Run(podFullName, uuid string, container *api.Container, handler *api.Handler) error {
-	_, err := e.kubelet.RunInContainer(podFullName, container.Name, handler.Exec.Command)
+	_, err := e.kubelet.RunInContainer(podFullName, uuid, container.Name, handler.Exec.Command)
 	return err
 }
 
@@ -65,11 +65,11 @@ func ResolvePort(portReference util.IntOrString, container *api.Container) (int,
 	return -1, fmt.Errorf("couldn't find port: %v in %v", portReference, container)
 }
 
-func (h *httpActionHandler) Run(podFullName string, container *api.Container, handler *api.Handler) error {
+func (h *httpActionHandler) Run(podFullName, uuid string, container *api.Container, handler *api.Handler) error {
 	host := handler.HTTPGet.Host
 	if len(host) == 0 {
 		var info api.PodInfo
-		info, err := h.kubelet.GetPodInfo(podFullName)
+		info, err := h.kubelet.GetPodInfo(podFullName, uuid)
 		if err != nil {
 			glog.Errorf("unable to get pod info, event handlers may be invalid.")
 			return err

pkg/kubelet/kubelet.go

@@ -292,7 +292,7 @@ func (kl *Kubelet) mountExternalVolumes(manifest *api.ContainerManifest) (volume
 
 // A basic interface that knows how to execute handlers
 type actionHandler interface {
-	Run(podFullName string, container *api.Container, handler *api.Handler) error
+	Run(podFullName, uuid string, container *api.Container, handler *api.Handler) error
 }
 
 func (kl *Kubelet) newActionHandler(handler *api.Handler) actionHandler {
@@ -307,12 +307,12 @@ func (kl *Kubelet) newActionHandler(handler *api.Handler) actionHandler {
 	}
 }
 
-func (kl *Kubelet) runHandler(podFullName string, container *api.Container, handler *api.Handler) error {
+func (kl *Kubelet) runHandler(podFullName, uuid string, container *api.Container, handler *api.Handler) error {
 	actionHandler := kl.newActionHandler(handler)
 	if actionHandler == nil {
 		return fmt.Errorf("invalid handler")
 	}
-	return actionHandler.Run(podFullName, container, handler)
+	return actionHandler.Run(podFullName, uuid, container, handler)
 }
 
 // Run a single container from a pod. Returns the docker container ID
@@ -344,7 +344,7 @@ func (kl *Kubelet) runContainer(pod *Pod, container *api.Container, podVolumes v
 		NetworkMode:  netMode,
 	})
 	if err == nil && container.Lifecycle != nil && container.Lifecycle.PostStart != nil {
-		handlerErr := kl.runHandler(GetPodFullName(pod), container, container.Lifecycle.PostStart)
+		handlerErr := kl.runHandler(GetPodFullName(pod), pod.Manifest.UUID, container, container.Lifecycle.PostStart)
 		if handlerErr != nil {
 			kl.killContainerByID(dockerContainer.ID, "")
 			return DockerID(""), fmt.Errorf("failed to call event handler: %v", handlerErr)
@@ -364,12 +364,13 @@ func (kl *Kubelet) killContainerByID(ID, name string) error {
 	if len(name) == 0 {
 		return err
 	}
-	podFullName, containerName, _ := parseDockerName(name)
+	podFullName, uuid, containerName, _ := parseDockerName(name)
 	kl.LogEvent(&api.Event{
 		Event: "STOP",
 		Manifest: &api.ContainerManifest{
 			//TODO: This should be reported using either the apiserver schema or the kubelet schema
-			ID: podFullName,
+			ID:   podFullName,
+			UUID: uuid,
 		},
 		Container: &api.Container{
 			Name: containerName,
@@ -408,7 +409,7 @@ func (kl *Kubelet) deleteAllContainers(pod *Pod, podFullName string, dockerConta
 	errs := make(chan error, len(pod.Manifest.Containers))
 	wg := sync.WaitGroup{}
 	for _, container := range pod.Manifest.Containers {
-		if dockerContainer, found, _ := dockerContainers.FindPodContainer(podFullName, container.Name); found {
+		if dockerContainer, found, _ := dockerContainers.FindPodContainer(podFullName, pod.Manifest.UUID, container.Name); found {
 			count++
 			wg.Add(1)
 			go func() {
@@ -437,12 +438,13 @@ type empty struct{}
 
 func (kl *Kubelet) syncPod(pod *Pod, dockerContainers DockerContainers) error {
 	podFullName := GetPodFullName(pod)
+	uuid := pod.Manifest.UUID
 	containersToKeep := make(map[DockerID]empty)
 	killedContainers := make(map[DockerID]empty)
 
 	// Make sure we have a network container
 	var netID DockerID
-	if networkDockerContainer, found, _ := dockerContainers.FindPodContainer(podFullName, networkContainerName); found {
+	if networkDockerContainer, found, _ := dockerContainers.FindPodContainer(podFullName, uuid, networkContainerName); found {
 		netID = DockerID(networkDockerContainer.ID)
 	} else {
 		glog.Infof("Network container doesn't exist, creating")
@@ -473,10 +475,11 @@ func (kl *Kubelet) syncPod(pod *Pod, dockerContainers DockerContainers) error {
 		return err
 	}
 
-	podState := api.PodState{}
+	podState := api.PodState{Manifest: api.ContainerManifest{UUID: uuid}}
-	info, err := kl.GetPodInfo(podFullName)
+	info, err := kl.GetPodInfo(podFullName, uuid)
 	if err != nil {
-		glog.Errorf("Unable to get pod info, health checks may be invalid.")
+		glog.Errorf("Unable to get pod with name %s and uuid %s info, health checks may be invalid.",
+			podFullName, uuid)
 	}
 	netInfo, found := info[networkContainerName]
 	if found && netInfo.NetworkSettings != nil {
@@ -485,9 +488,8 @@ func (kl *Kubelet) syncPod(pod *Pod, dockerContainers DockerContainers) error {
 
 	for _, container := range pod.Manifest.Containers {
 		expectedHash := hashContainer(&container)
-		if dockerContainer, found, hash := dockerContainers.FindPodContainer(podFullName, container.Name); found {
+		if dockerContainer, found, hash := dockerContainers.FindPodContainer(podFullName, uuid, container.Name); found {
 			containerID := DockerID(dockerContainer.ID)
-			glog.Infof("pod %s container %s exists as %v", podFullName, container.Name, containerID)
 			glog.V(1).Infof("pod %s container %s exists as %v", podFullName, container.Name, containerID)
 
 			// look for changes in the container.
@@ -530,8 +532,8 @@ func (kl *Kubelet) syncPod(pod *Pod, dockerContainers DockerContainers) error {
 
 	// Kill any containers in this pod which were not identified above (guards against duplicates).
 	for id, container := range dockerContainers {
-		curPodFullName, _, _ := parseDockerName(container.Names[0])
+		curPodFullName, curUUID, _, _ := parseDockerName(container.Names[0])
-		if curPodFullName == podFullName {
+		if curPodFullName == podFullName && curUUID == uuid {
 			// Don't kill containers we want to keep or those we already killed.
 			_, keep := containersToKeep[id]
 			_, killed := killedContainers[id]
@@ -549,6 +551,7 @@ func (kl *Kubelet) syncPod(pod *Pod, dockerContainers DockerContainers) error {
 
 type podContainer struct {
 	podFullName   string
+	uuid          string
 	containerName string
 }
 
@@ -601,11 +604,12 @@ func (kl *Kubelet) SyncPods(pods []Pod) error {
 	for i := range pods {
 		pod := &pods[i]
 		podFullName := GetPodFullName(pod)
+		uuid := pod.Manifest.UUID
 
 		// Add all containers (including net) to the map.
-		desiredContainers[podContainer{podFullName, networkContainerName}] = empty{}
+		desiredContainers[podContainer{podFullName, uuid, networkContainerName}] = empty{}
 		for _, cont := range pod.Manifest.Containers {
-			desiredContainers[podContainer{podFullName, cont.Name}] = empty{}
+			desiredContainers[podContainer{podFullName, uuid, cont.Name}] = empty{}
 		}
 
 		// Run the sync in an async manifest worker.
@@ -625,8 +629,8 @@ func (kl *Kubelet) SyncPods(pods []Pod) error {
 	}
 	for _, container := range existingContainers {
 		// Don't kill containers that are in the desired pods.
-		podFullName, containerName, _ := parseDockerName(container.Names[0])
+		podFullName, uuid, containerName, _ := parseDockerName(container.Names[0])
-		if _, ok := desiredContainers[podContainer{podFullName, containerName}]; !ok {
+		if _, ok := desiredContainers[podContainer{podFullName, uuid, containerName}]; !ok {
 			err = kl.killContainer(container)
 			if err != nil {
 				glog.Errorf("Error killing container: %v", err)
@@ -716,12 +720,12 @@ func (kl *Kubelet) statsFromContainerPath(containerPath string, req *info.Contai
 }
 
 // GetPodInfo returns information from Docker about the containers in a pod
-func (kl *Kubelet) GetPodInfo(podFullName string) (api.PodInfo, error) {
+func (kl *Kubelet) GetPodInfo(podFullName, uuid string) (api.PodInfo, error) {
-	return getDockerPodInfo(kl.dockerClient, podFullName)
+	return getDockerPodInfo(kl.dockerClient, podFullName, uuid)
 }
 
 // GetContainerInfo returns stats (from Cadvisor) for a container.
-func (kl *Kubelet) GetContainerInfo(podFullName, containerName string, req *info.ContainerInfoRequest) (*info.ContainerInfo, error) {
+func (kl *Kubelet) GetContainerInfo(podFullName, uuid, containerName string, req *info.ContainerInfoRequest) (*info.ContainerInfo, error) {
 	if kl.cadvisorClient == nil {
 		return nil, nil
 	}
@@ -729,7 +733,7 @@ func (kl *Kubelet) GetContainerInfo(podFullName, containerName string, req *info
 	if err != nil {
 		return nil, err
 	}
-	dockerContainer, found, _ := dockerContainers.FindPodContainer(podFullName, containerName)
+	dockerContainer, found, _ := dockerContainers.FindPodContainer(podFullName, uuid, containerName)
 	if !found {
 		return nil, errors.New("couldn't find container")
 	}
@@ -766,7 +770,7 @@ func (kl *Kubelet) ServeLogs(w http.ResponseWriter, req *http.Request) {
 }
 
 // Run a command in a container, returns the combined stdout, stderr as an array of bytes
-func (kl *Kubelet) RunInContainer(podFullName, container string, cmd []string) ([]byte, error) {
+func (kl *Kubelet) RunInContainer(podFullName, uuid, container string, cmd []string) ([]byte, error) {
 	if kl.runner == nil {
 		return nil, fmt.Errorf("no runner specified.")
 	}
@@ -774,7 +778,7 @@ func (kl *Kubelet) RunInContainer(podFullName, container string, cmd []string) (
 	if err != nil {
 		return nil, err
 	}
-	dockerContainer, found, _ := dockerContainers.FindPodContainer(podFullName, container)
+	dockerContainer, found, _ := dockerContainers.FindPodContainer(podFullName, uuid, container)
 	if !found {
 		return nil, fmt.Errorf("container not found (%s)", container)
 	}

pkg/kubelet/kubelet_test.go

@@ -84,7 +84,7 @@ func verifyPackUnpack(t *testing.T, podNamespace, podName, containerName string)
 		container,
 	)
 	podFullName := fmt.Sprintf("%s.%s", podName, podNamespace)
-	returnedPodFullName, returnedContainerName, hash := parseDockerName(name)
+	returnedPodFullName, _, returnedContainerName, hash := parseDockerName(name)
 	if podFullName != returnedPodFullName || containerName != returnedContainerName || computedHash != hash {
 		t.Errorf("For (%s, %s, %d), unpacked (%s, %s, %d)", podFullName, containerName, computedHash, returnedPodFullName, returnedContainerName, hash)
 	}
@@ -108,7 +108,7 @@ func TestContainerManifestNaming(t *testing.T) {
 	name := fmt.Sprintf("k8s--%s--%s.%s--12345", container.Name, pod.Name, pod.Namespace)
 
 	podFullName := fmt.Sprintf("%s.%s", pod.Name, pod.Namespace)
-	returnedPodFullName, returnedContainerName, hash := parseDockerName(name)
+	returnedPodFullName, _, returnedContainerName, hash := parseDockerName(name)
 	if returnedPodFullName != podFullName || returnedContainerName != container.Name || hash != 0 {
 		t.Errorf("unexpected parse: %s %s %d", returnedPodFullName, returnedContainerName, hash)
 	}
@@ -139,13 +139,13 @@ func TestGetContainerID(t *testing.T) {
 		t.Errorf("Expected %#v, Got %#v", fakeDocker.containerList, dockerContainers)
 	}
 	verifyCalls(t, fakeDocker, []string{"list"})
-	dockerContainer, found, _ := dockerContainers.FindPodContainer("qux", "foo")
+	dockerContainer, found, _ := dockerContainers.FindPodContainer("qux", "", "foo")
 	if dockerContainer == nil || !found {
 		t.Errorf("Failed to find container %#v", dockerContainer)
 	}
 
 	fakeDocker.clearCalls()
-	dockerContainer, found, _ = dockerContainers.FindPodContainer("foobar", "foo")
+	dockerContainer, found, _ = dockerContainers.FindPodContainer("foobar", "", "foo")
 	verifyCalls(t, fakeDocker, []string{})
 	if dockerContainer != nil || found {
 		t.Errorf("Should not have found container %#v", dockerContainer)
@@ -943,7 +943,7 @@ func TestGetContainerInfo(t *testing.T) {
 		},
 	}
 
-	stats, err := kubelet.GetContainerInfo("qux", "foo", req)
+	stats, err := kubelet.GetContainerInfo("qux", "", "foo", req)
 	if err != nil {
 		t.Errorf("unexpected error: %v", err)
 	}
@@ -1009,11 +1009,11 @@ func TestGetContainerInfoWithoutCadvisor(t *testing.T) {
 			ID: "foobar",
 			// pod id: qux
 			// container id: foo
-			Names: []string{"/k8s--foo--qux--1234"},
+			Names: []string{"/k8s--foo--qux--uuid--1234"},
 		},
 	}
 
-	stats, _ := kubelet.GetContainerInfo("qux", "foo", nil)
+	stats, _ := kubelet.GetContainerInfo("qux", "uuid", "foo", nil)
 	// When there's no cAdvisor, the stats should be either nil or empty
 	if stats == nil {
 		return
@@ -1047,11 +1047,11 @@ func TestGetContainerInfoWhenCadvisorFailed(t *testing.T) {
 			ID: containerID,
 			// pod id: qux
 			// container id: foo
-			Names: []string{"/k8s--foo--qux--1234"},
+			Names: []string{"/k8s--foo--qux--uuid--1234"},
 		},
 	}
 
-	stats, err := kubelet.GetContainerInfo("qux", "foo", req)
+	stats, err := kubelet.GetContainerInfo("qux", "uuid", "foo", req)
 	if stats != nil {
 		t.Errorf("non-nil stats on error")
 	}
@@ -1072,7 +1072,7 @@ func TestGetContainerInfoOnNonExistContainer(t *testing.T) {
 	kubelet.cadvisorClient = mockCadvisor
 	fakeDocker.containerList = []docker.APIContainers{}
 
-	stats, _ := kubelet.GetContainerInfo("qux", "foo", nil)
+	stats, _ := kubelet.GetContainerInfo("qux", "", "foo", nil)
 	if stats != nil {
 		t.Errorf("non-nil stats on non exist container")
 	}
@@ -1102,6 +1102,7 @@ func TestRunInContainerNoSuchPod(t *testing.T) {
 	containerName := "containerFoo"
 	output, err := kubelet.RunInContainer(
 		GetPodFullName(&Pod{Name: podName, Namespace: podNamespace}),
+		"",
 		containerName,
 		[]string{"ls"})
 	if output != nil {
@@ -1132,6 +1133,7 @@ func TestRunInContainer(t *testing.T) {
 	cmd := []string{"ls"}
 	_, err := kubelet.RunInContainer(
 		GetPodFullName(&Pod{Name: podName, Namespace: podNamespace}),
+		"",
 		containerName,
 		cmd)
 	if fakeCommandRunner.ID != containerID {
@@ -1209,7 +1211,7 @@ func TestRunHandlerExec(t *testing.T) {
 			},
 		},
 	}
-	err := kubelet.runHandler(podName+"."+podNamespace, &container, container.Lifecycle.PostStart)
+	err := kubelet.runHandler(podName+"."+podNamespace, "", &container, container.Lifecycle.PostStart)
 	if err != nil {
 		t.Errorf("unexpected error: %v", err)
 	}
@@ -1251,7 +1253,7 @@ func TestRunHandlerHttp(t *testing.T) {
 			},
 		},
 	}
-	err := kubelet.runHandler(podName+"."+podNamespace, &container, container.Lifecycle.PostStart)
+	err := kubelet.runHandler(podName+"."+podNamespace, "", &container, container.Lifecycle.PostStart)
 	if err != nil {
 		t.Errorf("unexpected error: %v", err)
 	}

pkg/kubelet/server.go

@@ -62,11 +62,11 @@ func ListenAndServeKubeletServer(host HostInterface, updates chan<- interface{},
 // HostInterface contains all the kubelet methods required by the server.
 // For testablitiy.
 type HostInterface interface {
-	GetContainerInfo(podFullName, containerName string, req *info.ContainerInfoRequest) (*info.ContainerInfo, error)
+	GetContainerInfo(podFullName, uuid, containerName string, req *info.ContainerInfoRequest) (*info.ContainerInfo, error)
 	GetRootInfo(req *info.ContainerInfoRequest) (*info.ContainerInfo, error)
 	GetMachineInfo() (*info.MachineInfo, error)
-	GetPodInfo(name string) (api.PodInfo, error)
+	GetPodInfo(name, uuid string) (api.PodInfo, error)
-	RunInContainer(name, container string, cmd []string) ([]byte, error)
+	RunInContainer(name, uuid, container string, cmd []string) ([]byte, error)
 	ServeLogs(w http.ResponseWriter, req *http.Request)
 }
 
@@ -150,6 +150,7 @@ func (s *Server) handlePodInfo(w http.ResponseWriter, req *http.Request) {
 		return
 	}
 	podID := u.Query().Get("podID")
+	podUUID := u.Query().Get("UUID")
 	if len(podID) == 0 {
 		w.WriteHeader(http.StatusBadRequest)
 		http.Error(w, "Missing 'podID=' query entry.", http.StatusBadRequest)
@@ -157,7 +158,7 @@ func (s *Server) handlePodInfo(w http.ResponseWriter, req *http.Request) {
 	}
 	// TODO: backwards compatibility with existing API, needs API change
 	podFullName := GetPodFullName(&Pod{Name: podID, Namespace: "etcd"})
-	info, err := s.host.GetPodInfo(podFullName)
+	info, err := s.host.GetPodInfo(podFullName, podUUID)
 	if err == ErrNoContainersInPod {
 		http.Error(w, "Pod does not exist", http.StatusNotFound)
 		return
@@ -211,15 +212,21 @@ func (s *Server) handleRun(w http.ResponseWriter, req *http.Request) {
 		return
 	}
 	parts := strings.Split(u.Path, "/")
-	if len(parts) != 4 {
+	var podID, uuid, container string
+	if len(parts) == 4 {
+		podID = parts[2]
+		container = parts[3]
+	} else if len(parts) == 5 {
+		podID = parts[2]
+		uuid = parts[3]
+		container = parts[4]
+	} else {
 		http.Error(w, "Unexpected path for command running", http.StatusBadRequest)
 		return
 	}
-	podID := parts[2]
-	container := parts[3]
 	podFullName := GetPodFullName(&Pod{Name: podID, Namespace: "etcd"})
 	command := strings.Split(u.Query().Get("cmd"), " ")
-	data, err := s.host.RunInContainer(podFullName, container, command)
+	data, err := s.host.RunInContainer(podFullName, uuid, container, command)
 	if err != nil {
 		s.error(w, err)
 		return
@@ -241,7 +248,7 @@ func (s *Server) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 
 // serveStats implements stats logic.
 func (s *Server) serveStats(w http.ResponseWriter, req *http.Request) {
-	// /stats/<podfullname>/<containerName>
+	// /stats/<podfullname>/<containerName> or /stats/<podfullname>/<uuid>/<containerName>
 	components := strings.Split(strings.TrimPrefix(path.Clean(req.URL.Path), "/"), "/")
 	var stats *info.ContainerInfo
 	var err error
@@ -260,7 +267,10 @@ func (s *Server) serveStats(w http.ResponseWriter, req *http.Request) {
 		// TODO(monnand) Implement this
 		errors.New("pod level status currently unimplemented")
 	case 3:
-		stats, err = s.host.GetContainerInfo(components[1], components[2], &query)
+		// Backward compatibility without uuid information
+		stats, err = s.host.GetContainerInfo(components[1], "", components[2], &query)
+	case 4:
+		stats, err = s.host.GetContainerInfo(components[1], components[2], components[2], &query)
 	default:
 		http.Error(w, "unknown resource.", http.StatusNotFound)
 		return

pkg/kubelet/server_test.go

@@ -40,14 +40,14 @@ type fakeKubelet struct {
 	rootInfoFunc      func(query *info.ContainerInfoRequest) (*info.ContainerInfo, error)
 	machineInfoFunc   func() (*info.MachineInfo, error)
 	logFunc           func(w http.ResponseWriter, req *http.Request)
-	runFunc           func(podFullName, containerName string, cmd []string) ([]byte, error)
+	runFunc           func(podFullName, uuid, containerName string, cmd []string) ([]byte, error)
 }
 
-func (fk *fakeKubelet) GetPodInfo(name string) (api.PodInfo, error) {
+func (fk *fakeKubelet) GetPodInfo(name, uuid string) (api.PodInfo, error) {
 	return fk.infoFunc(name)
 }
 
-func (fk *fakeKubelet) GetContainerInfo(podFullName, containerName string, req *info.ContainerInfoRequest) (*info.ContainerInfo, error) {
+func (fk *fakeKubelet) GetContainerInfo(podFullName, uuid, containerName string, req *info.ContainerInfoRequest) (*info.ContainerInfo, error) {
 	return fk.containerInfoFunc(podFullName, containerName, req)
 }
 
@@ -63,8 +63,8 @@ func (fk *fakeKubelet) ServeLogs(w http.ResponseWriter, req *http.Request) {
 	fk.logFunc(w, req)
 }
 
-func (fk *fakeKubelet) RunInContainer(podFullName, containerName string, cmd []string) ([]byte, error) {
+func (fk *fakeKubelet) RunInContainer(podFullName, uuid, containerName string, cmd []string) ([]byte, error) {
-	return fk.runFunc(podFullName, containerName, cmd)
+	return fk.runFunc(podFullName, uuid, containerName, cmd)
 }
 
 type serverTestFramework struct {
@@ -301,7 +301,7 @@ func TestServeRunInContainer(t *testing.T) {
 	expectedPodName := podName + ".etcd"
 	expectedContainerName := "baz"
 	expectedCommand := "ls -a"
-	fw.fakeKubelet.runFunc = func(podFullName, containerName string, cmd []string) ([]byte, error) {
+	fw.fakeKubelet.runFunc = func(podFullName, uuid, containerName string, cmd []string) ([]byte, error) {
 		if podFullName != expectedPodName {
 			t.Errorf("expected %s, got %s", expectedPodName, podFullName)
 		}
@@ -332,3 +332,46 @@ func TestServeRunInContainer(t *testing.T) {
 		t.Errorf("expected %s, got %s", output, result)
 	}
 }
+
+func TestServeRunInContainerWithUUID(t *testing.T) {
+	fw := newServerTest()
+	output := "foo bar"
+	podName := "foo"
+	expectedPodName := podName + ".etcd"
+	expectedUuid := "7e00838d_-_3523_-_11e4_-_8421_-_42010af0a720"
+	expectedContainerName := "baz"
+	expectedCommand := "ls -a"
+	fw.fakeKubelet.runFunc = func(podFullName, uuid, containerName string, cmd []string) ([]byte, error) {
+		if podFullName != expectedPodName {
+			t.Errorf("expected %s, got %s", expectedPodName, podFullName)
+		}
+		if uuid != expectedUuid {
+			t.Errorf("expected %s, got %s", expectedUuid, uuid)
+		}
+		if containerName != expectedContainerName {
+			t.Errorf("expected %s, got %s", expectedContainerName, containerName)
+		}
+		if strings.Join(cmd, " ") != expectedCommand {
+			t.Errorf("expected: %s, got %v", expectedCommand, cmd)
+		}
+
+		return []byte(output), nil
+	}
+
+	resp, err := http.Get(fw.testHTTPServer.URL + "/run/" + podName + "/" + expectedUuid + "/" + expectedContainerName + "?cmd=ls%20-a")
+
+	if err != nil {
+		t.Fatalf("Got error GETing: %v", err)
+	}
+	defer resp.Body.Close()
+
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		// copying the response body did not work
+		t.Errorf("Cannot copy resp: %#v", err)
+	}
+	result := string(body)
+	if result != output {
+		t.Errorf("expected %s, got %s", output, result)
+	}
+}

pkg/registry/pod/storage.go

@@ -67,8 +67,9 @@ func NewRegistryStorage(config *RegistryStorageConfig) apiserver.RESTStorage {
 
 func (rs *RegistryStorage) Create(obj runtime.Object) (<-chan runtime.Object, error) {
 	pod := obj.(*api.Pod)
+	pod.DesiredState.Manifest.UUID = uuid.NewUUID().String()
 	if len(pod.ID) == 0 {
-		pod.ID = uuid.NewUUID().String()
+		pod.ID = pod.DesiredState.Manifest.UUID
 	}
 	pod.DesiredState.Manifest.ID = pod.ID
 	if errs := validation.ValidatePod(pod); len(errs) > 0 {

pkg/registry/pod/storage_test.go

@@ -99,6 +99,29 @@ func TestCreatePodSetsIds(t *testing.T) {
 	}
 }
 
+func TestCreatePodSetsUUIDs(t *testing.T) {
+	podRegistry := registrytest.NewPodRegistry(nil)
+	podRegistry.Err = fmt.Errorf("test error")
+	storage := RegistryStorage{
+		registry: podRegistry,
+	}
+	desiredState := api.PodState{
+		Manifest: api.ContainerManifest{
+			Version: "v1beta1",
+		},
+	}
+	pod := &api.Pod{DesiredState: desiredState}
+	ch, err := storage.Create(pod)
+	if err != nil {
+		t.Errorf("Expected %#v, Got %#v", nil, err)
+	}
+	expectApiStatusError(t, ch, podRegistry.Err.Error())
+
+	if len(podRegistry.Pod.DesiredState.Manifest.UUID) == 0 {
+		t.Errorf("Expected pod UUID to be set, Got %#v", pod)
+	}
+}
+
 func TestListPodsError(t *testing.T) {
 	podRegistry := registrytest.NewPodRegistry(nil)
 	podRegistry.Err = fmt.Errorf("test error")