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Merge pull request #33233 from yujuhong/default_image_tag

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Automatic merge from submit-queue

Apply default image tags for all runtimes

Move the docker-specific logic up to the ImageManager to allow code sharing
among different implementations.

Part of #31459

/cc @kubernetes/sig-node
This commit is contained in:
Kubernetes Submit Queue 2016-10-01 04:29:12 -07:00 committed by GitHub
commit 4f32cc073b
7 changed files with 99 additions and 75 deletions
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1
pkg/kubelet/dockershim/docker_image.go
View File

@ -65,7 +65,6 @@ func (ds *dockerService) ImageStatus(image *runtimeApi.ImageSpec) (*runtimeApi.I
// PullImage pulls an image with authentication config.
func (ds *dockerService) PullImage(image *runtimeApi.ImageSpec, auth *runtimeApi.AuthConfig) error {
// TODO: add default tags for images or should this be done by kubelet?
return ds.client.PullImage(image.GetImage(),
dockertypes.AuthConfig{
Username: auth.GetUsername(),

26
pkg/kubelet/dockertools/docker.go
View File

@ -38,7 +38,6 @@ import (
"k8s.io/kubernetes/pkg/kubelet/leaky"
"k8s.io/kubernetes/pkg/types"
utilerrors "k8s.io/kubernetes/pkg/util/errors"
"k8s.io/kubernetes/pkg/util/parsers"
)
const (
@ -194,32 +193,7 @@ func matchImageTagOrSHA(inspected dockertypes.ImageInspect, image string) bool {
return false
}
// applyDefaultImageTag parses a docker image string, if it doesn't contain any tag or digest,
// a default tag will be applied.
func applyDefaultImageTag(image string) (string, error) {
named, err := dockerref.ParseNamed(image)
if err != nil {
return "", fmt.Errorf("couldn't parse image reference %q: %v", image, err)
}
_, isTagged := named.(dockerref.Tagged)
_, isDigested := named.(dockerref.Digested)
if !isTagged && !isDigested {
named, err := dockerref.WithTag(named, parsers.DefaultImageTag)
if err != nil {
return "", fmt.Errorf("failed to apply default image tag %q: %v", image, err)
}
image = named.String()
}
return image, nil
}
func (p dockerPuller) Pull(image string, secrets []api.Secret) error {
// If the image contains no tag or digest, a default tag should be applied.
image, err := applyDefaultImageTag(image)
if err != nil {
return err
}
keyring, err := credentialprovider.MakeDockerKeyring(secrets, p.keyring)
if err != nil {
return err

63
pkg/kubelet/dockertools/docker_manager_test.go
View File

@ -110,6 +110,16 @@ func (f *fakeRuntimeHelper) GetExtraSupplementalGroupsForPod(pod *api.Pod) []int
return nil
}
type fakeImageManager struct{}
func newFakeImageManager() images.ImageManager {
return &fakeImageManager{}
}
func (m *fakeImageManager) EnsureImageExists(pod *api.Pod, container *api.Container, pullSecrets []api.Secret) (error, string) {
return nil, ""
}
func createTestDockerManager(fakeHTTPClient *fakeHTTP, fakeDocker *FakeDockerClient) (*DockerManager, *FakeDockerClient) {
if fakeHTTPClient == nil {
fakeHTTPClient = &fakeHTTP{}
@ -144,17 +154,26 @@ func createTestDockerManager(fakeHTTPClient *fakeHTTP, fakeDocker *FakeDockerCli
return dockerManager, fakeDocker
}
func createTestDockerManagerWithFakeImageManager(fakeHTTPClient *fakeHTTP, fakeDocker *FakeDockerClient) (*DockerManager, *FakeDockerClient) {
dm, fd := createTestDockerManager(fakeHTTPClient, fakeDocker)
dm.imagePuller = newFakeImageManager()
return dm, fd
}
func newTestDockerManagerWithRealImageManager() (*DockerManager, *FakeDockerClient) {
return createTestDockerManager(nil, nil)
}
func newTestDockerManagerWithHTTPClient(fakeHTTPClient *fakeHTTP) (*DockerManager, *FakeDockerClient) {
return createTestDockerManager(fakeHTTPClient, nil)
return createTestDockerManagerWithFakeImageManager(fakeHTTPClient, nil)
}
func newTestDockerManagerWithVersion(version, apiVersion string) (*DockerManager, *FakeDockerClient) {
fakeDocker := NewFakeDockerClientWithVersion(version, apiVersion)
return createTestDockerManager(nil, fakeDocker)
return createTestDockerManagerWithFakeImageManager(nil, fakeDocker)
}
func newTestDockerManager() (*DockerManager, *FakeDockerClient) {
return createTestDockerManager(nil, nil)
return createTestDockerManagerWithFakeImageManager(nil, nil)
}
func matchString(t *testing.T, pattern, str string) bool {
@ -617,14 +636,14 @@ func TestSyncPodCreateNetAndContainer(t *testing.T) {
}
func TestSyncPodCreatesNetAndContainerPullsImage(t *testing.T) {
dm, fakeDocker := newTestDockerManager()
dm.podInfraContainerImage = "pod_infra_image"
dm, fakeDocker := newTestDockerManagerWithRealImageManager()
dm.podInfraContainerImage = "foo/infra_image:v1"
puller := dm.dockerPuller.(*FakeDockerPuller)
puller.HasImages = []string{}
dm.podInfraContainerImage = "pod_infra_image"
dm.podInfraContainerImage = "foo/infra_image:v1"
pod := makePod("foo", &api.PodSpec{
Containers: []api.Container{
{Name: "bar", Image: "something", ImagePullPolicy: "IfNotPresent"},
{Name: "bar", Image: "foo/something:v0", ImagePullPolicy: "IfNotPresent"},
},
})
@ -639,7 +658,7 @@ func TestSyncPodCreatesNetAndContainerPullsImage(t *testing.T) {
fakeDocker.Lock()
if !reflect.DeepEqual(puller.ImagesPulled, []string{"pod_infra_image", "something"}) {
if !reflect.DeepEqual(puller.ImagesPulled, []string{"foo/infra_image:v1", "foo/something:v0"}) {
t.Errorf("unexpected pulled containers: %v", puller.ImagesPulled)
}
@ -1478,18 +1497,18 @@ func TestGetIPCMode(t *testing.T) {
}
func TestSyncPodWithPullPolicy(t *testing.T) {
dm, fakeDocker := newTestDockerManager()
dm, fakeDocker := newTestDockerManagerWithRealImageManager()
puller := dm.dockerPuller.(*FakeDockerPuller)
puller.HasImages = []string{"existing_one", "want:latest"}
dm.podInfraContainerImage = "pod_infra_image"
puller.HasImages = []string{"foo/existing_one:v1", "foo/want:latest"}
dm.podInfraContainerImage = "foo/infra_image:v1"
pod := makePod("foo", &api.PodSpec{
Containers: []api.Container{
{Name: "bar", Image: "pull_always_image", ImagePullPolicy: api.PullAlways},
{Name: "bar2", Image: "pull_if_not_present_image", ImagePullPolicy: api.PullIfNotPresent},
{Name: "bar3", Image: "existing_one", ImagePullPolicy: api.PullIfNotPresent},
{Name: "bar4", Image: "want:latest", ImagePullPolicy: api.PullIfNotPresent},
{Name: "bar5", Image: "pull_never_image", ImagePullPolicy: api.PullNever},
{Name: "bar", Image: "foo/pull_always_image:v1", ImagePullPolicy: api.PullAlways},
{Name: "bar2", Image: "foo/pull_if_not_present_image:v1", ImagePullPolicy: api.PullIfNotPresent},
{Name: "bar3", Image: "foo/existing_one:v1", ImagePullPolicy: api.PullIfNotPresent},
{Name: "bar4", Image: "foo/want:latest", ImagePullPolicy: api.PullIfNotPresent},
{Name: "bar5", Image: "foo/pull_never_image:v1", ImagePullPolicy: api.PullNever},
},
})
@ -1503,7 +1522,7 @@ func TestSyncPodWithPullPolicy(t *testing.T) {
{kubecontainer.StartContainer, "bar3", nil, ""},
{kubecontainer.StartContainer, "bar4", nil, ""},
{kubecontainer.StartContainer, "bar5", images.ErrImageNeverPull,
"Container image \"pull_never_image\" is not present with pull policy of Never"},
"Container image \"foo/pull_never_image:v1\" is not present with pull policy of Never"},
}
result := runSyncPod(t, dm, fakeDocker, pod, nil, true)
@ -1514,7 +1533,7 @@ func TestSyncPodWithPullPolicy(t *testing.T) {
pulledImageSorted := puller.ImagesPulled[:]
sort.Strings(pulledImageSorted)
assert.Equal(t, []string{"pod_infra_image", "pull_always_image", "pull_if_not_present_image"}, pulledImageSorted)
assert.Equal(t, []string{"foo/infra_image:v1", "foo/pull_always_image:v1", "foo/pull_if_not_present_image:v1"}, pulledImageSorted)
if len(fakeDocker.Created) != 5 {
t.Errorf("unexpected containers created %v", fakeDocker.Created)
@ -1533,19 +1552,19 @@ func TestSyncPodWithFailure(t *testing.T) {
expected []*kubecontainer.SyncResult
}{
"PullImageFailure": {
api.Container{Name: "bar", Image: "realImage", ImagePullPolicy: api.PullAlways},
api.Container{Name: "bar", Image: "foo/real_image:v1", ImagePullPolicy: api.PullAlways},
map[string]error{},
[]error{fmt.Errorf("can't pull image")},
[]*kubecontainer.SyncResult{{kubecontainer.StartContainer, "bar", images.ErrImagePull, "can't pull image"}},
},
"CreateContainerFailure": {
api.Container{Name: "bar", Image: "alreadyPresent"},
api.Container{Name: "bar", Image: "foo/already_present:v2"},
map[string]error{"create": fmt.Errorf("can't create container")},
[]error{},
[]*kubecontainer.SyncResult{{kubecontainer.StartContainer, "bar", kubecontainer.ErrRunContainer, "can't create container"}},
},
"StartContainerFailure": {
api.Container{Name: "bar", Image: "alreadyPresent"},
api.Container{Name: "bar", Image: "foo/already_present:v2"},
map[string]error{"start": fmt.Errorf("can't start container")},
[]error{},
[]*kubecontainer.SyncResult{{kubecontainer.StartContainer, "bar", kubecontainer.ErrRunContainer, "can't start container"}},
@ -1553,7 +1572,7 @@ func TestSyncPodWithFailure(t *testing.T) {
}
for _, test := range tests {
dm, fakeDocker := newTestDockerManager()
dm, fakeDocker := newTestDockerManagerWithRealImageManager()
puller := dm.dockerPuller.(*FakeDockerPuller)
puller.HasImages = []string{test.container.Image}
// Pretend that the pod infra container has already been created, so that

32
pkg/kubelet/dockertools/docker_test.go
View File

@ -315,34 +315,16 @@ func TestMatchImageTagOrSHA(t *testing.T) {
}
}
func TestApplyDefaultImageTag(t *testing.T) {
for _, testCase := range []struct {
Input string
Output string
}{
{Input: "root", Output: "root:latest"},
{Input: "root:tag", Output: "root:tag"},
{Input: "root@sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", Output: "root@sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"},
} {
image, err := applyDefaultImageTag(testCase.Input)
if err != nil {
t.Errorf("applyDefaultTag(%s) failed: %v", testCase.Input, err)
} else if image != testCase.Output {
t.Errorf("Expected image reference: %q, got %q", testCase.Output, image)
}
}
}
func TestPullWithNoSecrets(t *testing.T) {
tests := []struct {
imageName string
expectedImage string
}{
{"ubuntu", "ubuntu:latest using {}"},
{"ubuntu", "ubuntu using {}"},
{"ubuntu:2342", "ubuntu:2342 using {}"},
{"ubuntu:latest", "ubuntu:latest using {}"},
{"foo/bar:445566", "foo/bar:445566 using {}"},
{"registry.example.com:5000/foobar", "registry.example.com:5000/foobar:latest using {}"},
{"registry.example.com:5000/foobar", "registry.example.com:5000/foobar using {}"},
{"registry.example.com:5000/foobar:5342", "registry.example.com:5000/foobar:5342 using {}"},
{"registry.example.com:5000/foobar:latest", "registry.example.com:5000/foobar:latest using {}"},
}
@ -430,7 +412,7 @@ func TestPullWithSecrets(t *testing.T) {
"ubuntu",
[]api.Secret{},
credentialprovider.DockerConfig(map[string]credentialprovider.DockerConfigEntry{}),
[]string{"ubuntu:latest using {}"},
[]string{"ubuntu using {}"},
},
"default keyring secrets": {
"ubuntu",
@ -438,7 +420,7 @@ func TestPullWithSecrets(t *testing.T) {
credentialprovider.DockerConfig(map[string]credentialprovider.DockerConfigEntry{
"index.docker.io/v1/": {Username: "built-in", Password: "password", Email: "email", Provider: nil},
}),
[]string{`ubuntu:latest using {"username":"built-in","password":"password","email":"email"}`},
[]string{`ubuntu using {"username":"built-in","password":"password","email":"email"}`},
},
"default keyring secrets unused": {
"ubuntu",
@ -446,7 +428,7 @@ func TestPullWithSecrets(t *testing.T) {
credentialprovider.DockerConfig(map[string]credentialprovider.DockerConfigEntry{
"extraneous": {Username: "built-in", Password: "password", Email: "email", Provider: nil},
}),
[]string{`ubuntu:latest using {}`},
[]string{`ubuntu using {}`},
},
"builtin keyring secrets, but use passed": {
"ubuntu",
@ -454,7 +436,7 @@ func TestPullWithSecrets(t *testing.T) {
credentialprovider.DockerConfig(map[string]credentialprovider.DockerConfigEntry{
"index.docker.io/v1/": {Username: "built-in", Password: "password", Email: "email", Provider: nil},
}),
[]string{`ubuntu:latest using {"username":"passed-user","password":"passed-password","email":"passed-email"}`},
[]string{`ubuntu using {"username":"passed-user","password":"passed-password","email":"passed-email"}`},
},
"builtin keyring secrets, but use passed with new docker config": {
"ubuntu",
@ -462,7 +444,7 @@ func TestPullWithSecrets(t *testing.T) {
credentialprovider.DockerConfig(map[string]credentialprovider.DockerConfigEntry{
"index.docker.io/v1/": {Username: "built-in", Password: "password", Email: "email", Provider: nil},
}),
[]string{`ubuntu:latest using {"username":"passed-user","password":"passed-password","email":"passed-email"}`},
[]string{`ubuntu using {"username":"passed-user","password":"passed-password","email":"passed-email"}`},
},
}
for i, test := range tests {

31
pkg/kubelet/images/image_manager.go
View File

@ -19,12 +19,14 @@ package images
import (
"fmt"
dockerref "github.com/docker/distribution/reference"
"github.com/golang/glog"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/client/record"
kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
"k8s.io/kubernetes/pkg/kubelet/events"
"k8s.io/kubernetes/pkg/util/flowcontrol"
"k8s.io/kubernetes/pkg/util/parsers"
)
// imageManager provides the functionalities for image pulling.
@ -87,7 +89,15 @@ func (m *imageManager) EnsureImageExists(pod *api.Pod, container *api.Container,
glog.Errorf("Couldn't make a ref to pod %v, container %v: '%v'", pod.Name, container.Name, err)
}
spec := kubecontainer.ImageSpec{Image: container.Image}
// If the image contains no tag or digest, a default tag should be applied.
image, err := applyDefaultImageTag(container.Image)
if err != nil {
msg := fmt.Sprintf("Failed to apply default image tag %q: %v", container.Image, err)
m.logIt(ref, api.EventTypeWarning, events.FailedToInspectImage, logPrefix, msg, glog.Warning)
return ErrInvalidImageName, msg
}
spec := kubecontainer.ImageSpec{Image: image}
present, err := m.imageService.IsImagePresent(spec)
if err != nil {
msg := fmt.Sprintf("Failed to inspect image %q: %v", container.Image, err)
@ -130,3 +140,22 @@ func (m *imageManager) EnsureImageExists(pod *api.Pod, container *api.Container,
m.backOff.GC()
return nil, ""
}
// applyDefaultImageTag parses a docker image string, if it doesn't contain any tag or digest,
// a default tag will be applied.
func applyDefaultImageTag(image string) (string, error) {
named, err := dockerref.ParseNamed(image)
if err != nil {
return "", fmt.Errorf("couldn't parse image reference %q: %v", image, err)
}
_, isTagged := named.(dockerref.Tagged)
_, isDigested := named.(dockerref.Digested)
if !isTagged && !isDigested {
named, err := dockerref.WithTag(named, parsers.DefaultImageTag)
if err != nil {
return "", fmt.Errorf("failed to apply default image tag %q: %v", image, err)
}
image = named.String()
}
return image, nil
}

18
pkg/kubelet/images/image_manager_test.go
View File

@ -211,3 +211,21 @@ func TestSerializedPuller(t *testing.T) {
}
}
}
func TestApplyDefaultImageTag(t *testing.T) {
for _, testCase := range []struct {
Input string
Output string
}{
{Input: "root", Output: "root:latest"},
{Input: "root:tag", Output: "root:tag"},
{Input: "root@sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", Output: "root@sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"},
} {
image, err := applyDefaultImageTag(testCase.Input)
if err != nil {
t.Errorf("applyDefaultImageTag(%s) failed: %v", testCase.Input, err)
} else if image != testCase.Output {
t.Errorf("Expected image reference: %q, got %q", testCase.Output, image)
}
}
}

3
pkg/kubelet/images/types.go
View File

@ -37,6 +37,9 @@ var (
// Get http error when pulling image from registry
RegistryUnavailable = errors.New("RegistryUnavailable")
// Unable to parse the image name.
ErrInvalidImageName = errors.New("InvalidImageName")
)
// ImageManager provides an interface to manage the lifecycle of images.