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Merge pull request #14599 from feiskyer/kubelet/client-server/image-refator

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Refactor image manager for client/server container runtime
This commit is contained in:
Dawn Chen 2015-09-29 09:33:59 -07:00
commit ca3ae476fc
3 changed files with 131 additions and 100 deletions
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33
pkg/kubelet/image_manager.go
View File

@ -22,12 +22,11 @@ import (
"sync"
"time"
docker "github.com/fsouza/go-dockerclient"
"github.com/golang/glog"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/client/record"
"k8s.io/kubernetes/pkg/kubelet/cadvisor"
"k8s.io/kubernetes/pkg/kubelet/dockertools"
"k8s.io/kubernetes/pkg/kubelet/container"
"k8s.io/kubernetes/pkg/util"
"k8s.io/kubernetes/pkg/util/sets"
)
@ -59,8 +58,8 @@ type ImageGCPolicy struct {
}
type realImageManager struct {
// Connection to the Docker daemon.
dockerClient dockertools.DockerInterface
// Container runtime
runtime container.Runtime
// Records of images and their use.
imageRecords map[string]*imageRecord
@ -91,7 +90,7 @@ type imageRecord struct {
size int64
}
func newImageManager(dockerClient dockertools.DockerInterface, cadvisorInterface cadvisor.Interface, recorder record.EventRecorder, nodeRef *api.ObjectReference, policy ImageGCPolicy) (imageManager, error) {
func newImageManager(runtime container.Runtime, cadvisorInterface cadvisor.Interface, recorder record.EventRecorder, nodeRef *api.ObjectReference, policy ImageGCPolicy) (imageManager, error) {
// Validate policy.
if policy.HighThresholdPercent < 0 || policy.HighThresholdPercent > 100 {
return nil, fmt.Errorf("invalid HighThresholdPercent %d, must be in range [0-100]", policy.HighThresholdPercent)
@ -100,7 +99,7 @@ func newImageManager(dockerClient dockertools.DockerInterface, cadvisorInterface
return nil, fmt.Errorf("invalid LowThresholdPercent %d, must be in range [0-100]", policy.LowThresholdPercent)
}
im := &realImageManager{
dockerClient: dockerClient,
runtime: runtime,
policy: policy,
imageRecords: make(map[string]*imageRecord),
cadvisor: cadvisorInterface,
@ -130,21 +129,21 @@ func (im *realImageManager) Start() error {
}
func (im *realImageManager) detectImages(detected time.Time) error {
images, err := im.dockerClient.ListImages(docker.ListImagesOptions{})
images, err := im.runtime.ListImages()
if err != nil {
return err
}
containers, err := im.dockerClient.ListContainers(docker.ListContainersOptions{
All: true,
})
pods, err := im.runtime.GetPods(true)
if err != nil {
return err
}
// Make a set of images in use by containers.
imagesInUse := sets.NewString()
for _, container := range containers {
imagesInUse.Insert(container.Image)
for _, pod := range pods {
for _, container := range pod.Containers {
imagesInUse.Insert(container.Image)
}
}
// Add new images and record those being used.
@ -163,11 +162,11 @@ func (im *realImageManager) detectImages(detected time.Time) error {
}
// Set last used time to now if the image is being used.
if isImageUsed(&image, imagesInUse) {
if isImageUsed(image, imagesInUse) {
im.imageRecords[image.ID].lastUsed = now
}
im.imageRecords[image.ID].size = image.VirtualSize
im.imageRecords[image.ID].size = image.Size
}
// Remove old images from our records.
@ -253,7 +252,7 @@ func (im *realImageManager) freeSpace(bytesToFree int64) (int64, error) {
// Remove image. Continue despite errors.
glog.Infof("[ImageManager]: Removing image %q to free %d bytes", image.id, image.size)
err := im.dockerClient.RemoveImage(image.id)
err := im.runtime.RemoveImage(container.ImageSpec{Image: image.id})
if err != nil {
lastErr = err
continue
@ -287,12 +286,12 @@ func (ev byLastUsedAndDetected) Less(i, j int) bool {
}
}
func isImageUsed(image *docker.APIImages, imagesInUse sets.String) bool {
func isImageUsed(image container.Image, imagesInUse sets.String) bool {
// Check the image ID and all the RepoTags.
if _, ok := imagesInUse[image.ID]; ok {
return true
}
for _, tag := range image.RepoTags {
for _, tag := range image.Tags {
if _, ok := imagesInUse[tag]; ok {
return true
}

185
pkg/kubelet/image_manager_test.go
View File

@ -21,30 +21,27 @@ import (
"testing"
"time"
docker "github.com/fsouza/go-dockerclient"
cadvisorApiV2 "github.com/google/cadvisor/info/v2"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"k8s.io/kubernetes/pkg/client/record"
"k8s.io/kubernetes/pkg/kubelet/cadvisor"
"k8s.io/kubernetes/pkg/kubelet/dockertools"
"k8s.io/kubernetes/pkg/util/sets"
"k8s.io/kubernetes/pkg/kubelet/container"
"k8s.io/kubernetes/pkg/types"
)
var zero time.Time
func newRealImageManager(policy ImageGCPolicy) (*realImageManager, *dockertools.FakeDockerClient, *cadvisor.Mock) {
fakeDocker := &dockertools.FakeDockerClient{
RemovedImages: sets.NewString(),
}
func newRealImageManager(policy ImageGCPolicy) (*realImageManager, *container.FakeRuntime, *cadvisor.Mock) {
fakeRuntime := &container.FakeRuntime{}
mockCadvisor := new(cadvisor.Mock)
return &realImageManager{
dockerClient: fakeDocker,
runtime: fakeRuntime,
policy: policy,
imageRecords: make(map[string]*imageRecord),
cadvisor: mockCadvisor,
recorder: &record.FakeRecorder{},
}, fakeDocker, mockCadvisor
}, fakeRuntime, mockCadvisor
}
// Accessors used for thread-safe testing.
@ -67,29 +64,33 @@ func imageName(id int) string {
}
// Make an image with the specified ID.
func makeImage(id int, size int64) docker.APIImages {
return docker.APIImages{
ID: imageName(id),
VirtualSize: size,
func makeImage(id int, size int64) container.Image {
return container.Image{
ID: imageName(id),
Size: size,
}
}
// Make a container with the specified ID. It will use the image with the same ID.
func makeContainer(id int) docker.APIContainers {
return docker.APIContainers{
ID: fmt.Sprintf("container-%d", id),
func makeContainer(id int) *container.Container {
return &container.Container{
ID: types.UID(fmt.Sprintf("container-%d", id)),
Image: imageName(id),
}
}
func TestDetectImagesInitialDetect(t *testing.T) {
manager, fakeDocker, _ := newRealImageManager(ImageGCPolicy{})
fakeDocker.Images = []docker.APIImages{
manager, fakeRuntime, _ := newRealImageManager(ImageGCPolicy{})
fakeRuntime.ImageList = []container.Image{
makeImage(0, 1024),
makeImage(1, 2048),
}
fakeDocker.ContainerList = []docker.APIContainers{
makeContainer(1),
fakeRuntime.PodList = []*container.Pod{
{
Containers: []*container.Container{
makeContainer(1),
},
},
}
startTime := time.Now().Add(-time.Millisecond)
@ -109,13 +110,17 @@ func TestDetectImagesInitialDetect(t *testing.T) {
func TestDetectImagesWithNewImage(t *testing.T) {
// Just one image initially.
manager, fakeDocker, _ := newRealImageManager(ImageGCPolicy{})
fakeDocker.Images = []docker.APIImages{
manager, fakeRuntime, _ := newRealImageManager(ImageGCPolicy{})
fakeRuntime.ImageList = []container.Image{
makeImage(0, 1024),
makeImage(1, 2048),
}
fakeDocker.ContainerList = []docker.APIContainers{
makeContainer(1),
fakeRuntime.PodList = []*container.Pod{
{
Containers: []*container.Container{
makeContainer(1),
},
},
}
err := manager.detectImages(zero)
@ -124,7 +129,7 @@ func TestDetectImagesWithNewImage(t *testing.T) {
assert.Equal(manager.imageRecordsLen(), 2)
// Add a new image.
fakeDocker.Images = []docker.APIImages{
fakeRuntime.ImageList = []container.Image{
makeImage(0, 1024),
makeImage(1, 1024),
makeImage(2, 1024),
@ -150,13 +155,17 @@ func TestDetectImagesWithNewImage(t *testing.T) {
}
func TestDetectImagesContainerStopped(t *testing.T) {
manager, fakeDocker, _ := newRealImageManager(ImageGCPolicy{})
fakeDocker.Images = []docker.APIImages{
manager, fakeRuntime, _ := newRealImageManager(ImageGCPolicy{})
fakeRuntime.ImageList = []container.Image{
makeImage(0, 1024),
makeImage(1, 2048),
}
fakeDocker.ContainerList = []docker.APIContainers{
makeContainer(1),
fakeRuntime.PodList = []*container.Pod{
{
Containers: []*container.Container{
makeContainer(1),
},
},
}
err := manager.detectImages(zero)
@ -167,7 +176,7 @@ func TestDetectImagesContainerStopped(t *testing.T) {
require.True(t, ok)
// Simulate container being stopped.
fakeDocker.ContainerList = []docker.APIContainers{}
fakeRuntime.PodList = []*container.Pod{}
err = manager.detectImages(time.Now())
require.NoError(t, err)
assert.Equal(manager.imageRecordsLen(), 2)
@ -182,13 +191,17 @@ func TestDetectImagesContainerStopped(t *testing.T) {
}
func TestDetectImagesWithRemovedImages(t *testing.T) {
manager, fakeDocker, _ := newRealImageManager(ImageGCPolicy{})
fakeDocker.Images = []docker.APIImages{
manager, fakeRuntime, _ := newRealImageManager(ImageGCPolicy{})
fakeRuntime.ImageList = []container.Image{
makeImage(0, 1024),
makeImage(1, 2048),
}
fakeDocker.ContainerList = []docker.APIContainers{
makeContainer(1),
fakeRuntime.PodList = []*container.Pod{
{
Containers: []*container.Container{
makeContainer(1),
},
},
}
err := manager.detectImages(zero)
@ -197,48 +210,63 @@ func TestDetectImagesWithRemovedImages(t *testing.T) {
assert.Equal(manager.imageRecordsLen(), 2)
// Simulate both images being removed.
fakeDocker.Images = []docker.APIImages{}
fakeRuntime.ImageList = []container.Image{}
err = manager.detectImages(time.Now())
require.NoError(t, err)
assert.Equal(manager.imageRecordsLen(), 0)
}
func TestFreeSpaceImagesInUseContainersAreIgnored(t *testing.T) {
manager, fakeDocker, _ := newRealImageManager(ImageGCPolicy{})
fakeDocker.Images = []docker.APIImages{
manager, fakeRuntime, _ := newRealImageManager(ImageGCPolicy{})
fakeRuntime.ImageList = []container.Image{
makeImage(0, 1024),
makeImage(1, 2048),
}
fakeDocker.ContainerList = []docker.APIContainers{
makeContainer(1),
fakeRuntime.PodList = []*container.Pod{
{
Containers: []*container.Container{
makeContainer(1),
},
},
}
spaceFreed, err := manager.freeSpace(2048)
assert := assert.New(t)
require.NoError(t, err)
assert.EqualValues(1024, spaceFreed)
assert.Len(fakeDocker.RemovedImages, 1)
assert.True(fakeDocker.RemovedImages.Has(imageName(0)))
assert.Len(fakeRuntime.ImageList, 1)
}
func TestFreeSpaceRemoveByLeastRecentlyUsed(t *testing.T) {
manager, fakeDocker, _ := newRealImageManager(ImageGCPolicy{})
fakeDocker.Images = []docker.APIImages{
manager, fakeRuntime, _ := newRealImageManager(ImageGCPolicy{})
fakeRuntime.ImageList = []container.Image{
makeImage(0, 1024),
makeImage(1, 2048),
}
fakeDocker.ContainerList = []docker.APIContainers{
makeContainer(0),
makeContainer(1),
fakeRuntime.PodList = []*container.Pod{
{
Containers: []*container.Container{
makeContainer(0),
makeContainer(1),
},
},
}
// Make 1 be more recently used than 0.
require.NoError(t, manager.detectImages(zero))
fakeDocker.ContainerList = []docker.APIContainers{
makeContainer(1),
fakeRuntime.PodList = []*container.Pod{
{
Containers: []*container.Container{
makeContainer(1),
},
},
}
require.NoError(t, manager.detectImages(time.Now()))
fakeDocker.ContainerList = []docker.APIContainers{}
fakeRuntime.PodList = []*container.Pod{
{
Containers: []*container.Container{},
},
}
require.NoError(t, manager.detectImages(time.Now()))
require.Equal(t, manager.imageRecordsLen(), 2)
@ -246,56 +274,58 @@ func TestFreeSpaceRemoveByLeastRecentlyUsed(t *testing.T) {
assert := assert.New(t)
require.NoError(t, err)
assert.EqualValues(1024, spaceFreed)
assert.Len(fakeDocker.RemovedImages, 1)
assert.True(fakeDocker.RemovedImages.Has(imageName(0)))
assert.Len(fakeRuntime.ImageList, 1)
}
func TestFreeSpaceTiesBrokenByDetectedTime(t *testing.T) {
manager, fakeDocker, _ := newRealImageManager(ImageGCPolicy{})
fakeDocker.Images = []docker.APIImages{
manager, fakeRuntime, _ := newRealImageManager(ImageGCPolicy{})
fakeRuntime.ImageList = []container.Image{
makeImage(0, 1024),
}
fakeDocker.ContainerList = []docker.APIContainers{
makeContainer(0),
fakeRuntime.PodList = []*container.Pod{
{
Containers: []*container.Container{
makeContainer(0),
},
},
}
// Make 1 more recently detected but used at the same time as 0.
require.NoError(t, manager.detectImages(zero))
fakeDocker.Images = []docker.APIImages{
fakeRuntime.ImageList = []container.Image{
makeImage(0, 1024),
makeImage(1, 2048),
}
fakeDocker.ContainerList = []docker.APIContainers{
makeContainer(0),
makeContainer(1),
}
require.NoError(t, manager.detectImages(time.Now()))
fakeDocker.ContainerList = []docker.APIContainers{}
fakeRuntime.PodList = []*container.Pod{}
require.NoError(t, manager.detectImages(time.Now()))
require.Equal(t, manager.imageRecordsLen(), 2)
spaceFreed, err := manager.freeSpace(1024)
assert := assert.New(t)
require.NoError(t, err)
assert.EqualValues(1024, spaceFreed)
assert.Len(fakeDocker.RemovedImages, 1)
assert.True(fakeDocker.RemovedImages.Has(imageName(0)))
assert.EqualValues(2048, spaceFreed)
assert.Len(fakeRuntime.ImageList, 1)
}
func TestFreeSpaceImagesAlsoDoesLookupByRepoTags(t *testing.T) {
manager, fakeDocker, _ := newRealImageManager(ImageGCPolicy{})
fakeDocker.Images = []docker.APIImages{
manager, fakeRuntime, _ := newRealImageManager(ImageGCPolicy{})
fakeRuntime.ImageList = []container.Image{
makeImage(0, 1024),
{
ID: "5678",
RepoTags: []string{"potato", "salad"},
VirtualSize: 2048,
ID: "5678",
Tags: []string{"potato", "salad"},
Size: 2048,
},
}
fakeDocker.ContainerList = []docker.APIContainers{
fakeRuntime.PodList = []*container.Pod{
{
ID: "c5678",
Image: "salad",
Containers: []*container.Container{
{
ID: "c5678",
Image: "salad",
},
},
},
}
@ -303,8 +333,7 @@ func TestFreeSpaceImagesAlsoDoesLookupByRepoTags(t *testing.T) {
assert := assert.New(t)
require.NoError(t, err)
assert.EqualValues(1024, spaceFreed)
assert.Len(fakeDocker.RemovedImages, 1)
assert.True(fakeDocker.RemovedImages.Has(imageName(0)))
assert.Len(fakeRuntime.ImageList, 1)
}
func TestGarbageCollectBelowLowThreshold(t *testing.T) {
@ -339,14 +368,14 @@ func TestGarbageCollectBelowSuccess(t *testing.T) {
HighThresholdPercent: 90,
LowThresholdPercent: 80,
}
manager, fakeDocker, mockCadvisor := newRealImageManager(policy)
manager, fakeRuntime, mockCadvisor := newRealImageManager(policy)
// Expect 95% usage and most of it gets freed.
mockCadvisor.On("DockerImagesFsInfo").Return(cadvisorApiV2.FsInfo{
Usage: 950,
Capacity: 1000,
}, nil)
fakeDocker.Images = []docker.APIImages{
fakeRuntime.ImageList = []container.Image{
makeImage(0, 450),
}
@ -358,14 +387,14 @@ func TestGarbageCollectNotEnoughFreed(t *testing.T) {
HighThresholdPercent: 90,
LowThresholdPercent: 80,
}
manager, fakeDocker, mockCadvisor := newRealImageManager(policy)
manager, fakeRuntime, mockCadvisor := newRealImageManager(policy)
// Expect 95% usage and little of it gets freed.
mockCadvisor.On("DockerImagesFsInfo").Return(cadvisorApiV2.FsInfo{
Usage: 950,
Capacity: 1000,
}, nil)
fakeDocker.Images = []docker.APIImages{
fakeRuntime.ImageList = []container.Image{
makeImage(0, 50),
}

13
pkg/kubelet/kubelet.go
View File

@ -237,10 +237,7 @@ func NewMainKubelet(
if err != nil {
return nil, err
}
imageManager, err := newImageManager(dockerClient, cadvisorInterface, recorder, nodeRef, imageGCPolicy)
if err != nil {
return nil, fmt.Errorf("failed to initialize image manager: %v", err)
}
diskSpaceManager, err := newDiskSpaceManager(cadvisorInterface, diskSpacePolicy)
if err != nil {
return nil, fmt.Errorf("failed to initialize disk manager: %v", err)
@ -278,7 +275,6 @@ func NewMainKubelet(
recorder: recorder,
cadvisor: cadvisorInterface,
containerGC: containerGC,
imageManager: imageManager,
diskSpaceManager: diskSpaceManager,
statusManager: statusManager,
volumeManager: volumeManager,
@ -360,6 +356,13 @@ func NewMainKubelet(
return nil, fmt.Errorf("unsupported container runtime %q specified", containerRuntime)
}
// setup imageManager
imageManager, err := newImageManager(klet.containerRuntime, cadvisorInterface, recorder, nodeRef, imageGCPolicy)
if err != nil {
return nil, fmt.Errorf("failed to initialize image manager: %v", err)
}
klet.imageManager = imageManager
// Setup container manager, can fail if the devices hierarchy is not mounted
// (it is required by Docker however).
containerManager, err := newContainerManager(mounter, cadvisorInterface, dockerDaemonContainer, systemContainer, resourceContainer)