Merge pull request #7659 from vmarmol/runtime-switch

Have rkt implement the container Runtime interface

pkg/kubelet/container/runtime.go

@@ -69,11 +69,12 @@ type Runtime interface {
 	ListImages() ([]Image, error)
 	// Removes the specified image.
 	RemoveImage(image string) error
+	// TODO(vmarmol): Unify pod and containerID args.
 	// GetContainerLogs returns logs of a specific container. By
 	// default, it returns a snapshot of the container log. Set 'follow' to true to
 	// stream the log. Set 'follow' to false and specify the number of lines (e.g.
 	// "100" or "all") to tail the log.
-	GetContainerLogs(containerID, tail string, follow bool, stdout, stderr io.Writer) (err error)
+	GetContainerLogs(pod *api.Pod, containerID, tail string, follow bool, stdout, stderr io.Writer) (err error)
 }
 
 // Customizable hooks injected into container runtimes.

pkg/kubelet/dockertools/manager.go

@@ -209,7 +209,7 @@ func (sc *stringCache) Get(uid types.UID, name string) (string, bool) {
 // stream the log. Set 'follow' to false and specify the number of lines (e.g.
 // "100" or "all") to tail the log.
 // TODO: Make 'RawTerminal' option  flagable.
-func (dm *DockerManager) GetContainerLogs(containerID, tail string, follow bool, stdout, stderr io.Writer) (err error) {
+func (dm *DockerManager) GetContainerLogs(pod *api.Pod, containerID, tail string, follow bool, stdout, stderr io.Writer) (err error) {
 	opts := docker.LogsOptions{
 		Container:    containerID,
 		Stdout:       true,

pkg/kubelet/kubelet.go

@@ -1369,6 +1369,7 @@ func (kl *Kubelet) validateContainerStatus(podStatus *api.PodStatus, containerNa
 // TODO: this method is returning logs of random container attempts, when it should be returning the most recent attempt
 // or all of them.
 func (kl *Kubelet) GetKubeletContainerLogs(podFullName, containerName, tail string, follow bool, stdout, stderr io.Writer) error {
+	// TODO(vmarmol): Refactor to not need the pod status and verification.
 	podStatus, err := kl.GetPodStatus(podFullName)
 	if err != nil {
 		return fmt.Errorf("failed to get status for pod %q - %v", podFullName, err)
@@ -1383,7 +1384,11 @@ func (kl *Kubelet) GetKubeletContainerLogs(podFullName, containerName, tail stri
 		// waiting state.
 		return err
 	}
-	return kl.containerRuntime.GetContainerLogs(containerID, tail, follow, stdout, stderr)
+	pod, ok := kl.GetPodByFullName(podFullName)
+	if !ok {
+		return fmt.Errorf("unable to get logs for container %q in pod %q: unable to find pod", containerName, podFullName)
+	}
+	return kl.containerRuntime.GetContainerLogs(pod, containerID, tail, follow, stdout, stderr)
 }
 
 // GetHostname Returns the hostname as the kubelet sees it.

pkg/kubelet/rkt/log.go

@@ -21,7 +21,7 @@ import (
 	"os/exec"
 	"strconv"
 
-	kubecontainer "github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/container"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
 )
 
 // GetContainerLogs uses journalctl to get the logs of the container.
@@ -31,8 +31,8 @@ import (
 // TODO(yifan): Currently, it fetches all the containers' log within a pod. We will
 // be able to fetch individual container's log once https://github.com/coreos/rkt/pull/841
 // landed.
-func (r *Runtime) GetContainerLogs(pod kubecontainer.Pod, tail string, follow bool, stdout, stderr io.Writer) error {
-	unitName := makePodServiceFileName(pod.ID)
+func (r *Runtime) GetContainerLogs(pod *api.Pod, containerID string, tail string, follow bool, stdout, stderr io.Writer) error {
+	unitName := makePodServiceFileName(pod.UID)
 	cmd := exec.Command("journalctl", "-u", unitName)
 	if follow {
 		cmd.Args = append(cmd.Args, "-f")

pkg/kubelet/rkt/pull.go

@@ -22,6 +22,7 @@ import (
 	"path"
 	"strings"
 
+	kubecontainer "github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/container"
 	"github.com/docker/docker/pkg/parsers"
 	docker "github.com/fsouza/go-dockerclient"
 	"github.com/golang/glog"
@@ -108,3 +109,11 @@ func (r *Runtime) IsImagePresent(img string) (bool, error) {
 	}
 	return true, nil
 }
+
+func (r *Runtime) ListImages() ([]kubecontainer.Image, error) {
+	return []kubecontainer.Image{}, fmt.Errorf("rkt: ListImages unimplemented")
+}
+
+func (r *Runtime) RemoveImage(image string) error {
+	return fmt.Errorf("rkt: RemoveImages unimplemented")
+}

pkg/kubelet/rkt/rkt.go

@@ -81,6 +81,8 @@ type Runtime struct {
 	dockerKeyring credentialprovider.DockerKeyring
 }
 
+var _ kubecontainer.Runtime = &Runtime{}
+
 // New creates the rkt container runtime which implements the container runtime interface.
 // It will test if the rkt binary is in the $PATH, and whether we can get the
 // version of it. If so, creates the rkt container runtime, otherwise returns an error.

pkg/kubelet/rkt/runner.go

@@ -107,7 +107,7 @@ func (r *Runtime) ExecInContainer(containerID string, cmd []string, stdin io.Rea
 // findRktID returns the rkt uuid for the pod.
 // TODO(yifan): This is unefficient which require us to list
 // all the unit files.
-func (r *Runtime) findRktID(pod kubecontainer.Pod) (string, error) {
+func (r *Runtime) findRktID(pod *kubecontainer.Pod) (string, error) {
 	units, err := r.systemd.ListUnits()
 	if err != nil {
 		return "", err
@@ -150,7 +150,7 @@ func (r *Runtime) findRktID(pod kubecontainer.Pod) (string, error) {
 //  - should we support nsenter + socat in a container, running with elevated privs and --pid=host?
 //
 // TODO(yifan): Merge with the same function in dockertools.
-func (r *Runtime) PortForward(pod kubecontainer.Pod, port uint16, stream io.ReadWriteCloser) error {
+func (r *Runtime) PortForward(pod *kubecontainer.Pod, port uint16, stream io.ReadWriteCloser) error {
 	glog.V(4).Infof("Rkt port forwarding in container.")
 
 	podInfos, err := r.getPodInfos()