container

package
v0.19.2-0...-3168bd4 Latest Latest
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 Go to latest Published: Sep 6, 2017 License: Apache-2.0 Imports: 34 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	// MaxPodTerminationMessageLogLength is the maximum bytes any one pod may have written
	// as termination message output across all containers. Containers will be evenly truncated
	// until output is below this limit.
	MaxPodTerminationMessageLogLength = 1024 * 12
	// MaxContainerTerminationMessageLength is the upper bound any one container may write to
	// its termination message path. Contents above this length will be truncated.
	MaxContainerTerminationMessageLength = 1024 * 4
	// MaxContainerTerminationMessageLogLength is the maximum bytes any one container will
	// have written to its termination message when the message is read from the logs.
	MaxContainerTerminationMessageLogLength = 1024 * 2
	// MaxContainerTerminationMessageLogLines is the maximum number of previous lines of
	// log output that the termination message can contain.
	MaxContainerTerminationMessageLogLines = 80
)

Variables

View Source 
var (
	ErrRunContainer     = errors.New("RunContainerError")
	ErrKillContainer    = errors.New("KillContainerError")
	ErrVerifyNonRoot    = errors.New("VerifyNonRootError")
	ErrRunInitContainer = errors.New("RunInitContainerError")
	ErrCreatePodSandbox = errors.New("CreatePodSandboxError")
	ErrConfigPodSandbox = errors.New("ConfigPodSandboxError")
	ErrKillPodSandbox   = errors.New("KillPodSandboxError")
)
View Source 
var (
	ErrSetupNetwork    = errors.New("SetupNetworkError")
	ErrTeardownNetwork = errors.New("TeardownNetworkError")
)
View Source 
var (
	// ErrContainerNotFound returned when a container in the given pod with the
	// given container name was not found, amongst those managed by the kubelet.
	ErrContainerNotFound = errors.New("no matching container")
)
View Source 
var ErrCrashLoopBackOff = errors.New("CrashLoopBackOff")

Container Terminated and Kubelet is backing off the restart

View Source 
var ImplicitContainerPrefix string = "implicitly required container "

Functions

func BuildPodFullName 

func BuildPodFullName(name, namespace string) string

Build the pod full name from pod name and namespace.

func EnvVarsToMap 

func EnvVarsToMap(envs []EnvVar) map[string]string

EnvVarsToMap constructs a map of environment name to value from a slice of env vars.

func ExpandContainerCommandAndArgs 

func ExpandContainerCommandAndArgs(container *v1.Container, envs []EnvVar) (command []string, args []string)

func ExpandContainerCommandOnlyStatic 

func ExpandContainerCommandOnlyStatic(containerCommand []string, envs []v1.EnvVar) (command []string)

ExpandContainerCommandOnlyStatic substitutes only static environment variable values from the container environment definitions. This does *not* include valueFrom substitutions. TODO: callers should use ExpandContainerCommandAndArgs with a fully resolved list of environment.

func FilterEventRecorder 

func FilterEventRecorder(recorder record.EventRecorder) record.EventRecorder

Create an event recorder to record object's event except implicitly required container's, like infra container.

func FormatPod 

func FormatPod(pod *Pod) string

FormatPod returns a string representing a pod in a human readable format, with pod UID as part of the string.

func GenerateContainerRef 

func GenerateContainerRef(pod *v1.Pod, container *v1.Container) (*v1.ObjectReference, error)

GenerateContainerRef returns an *v1.ObjectReference which references the given container within the given pod. Returns an error if the reference can't be constructed or the container doesn't actually belong to the pod.

This function will return an error if the provided Pod does not have a selfLink, but we expect selfLink to be populated at all call sites for the function.

func GetContainerSpec 

func GetContainerSpec(pod *v1.Pod, containerName string) *v1.Container

GetContainerSpec gets the container spec by containerName.

func GetPodFullName 

func GetPodFullName(pod *v1.Pod) string

GetPodFullName returns a name that uniquely identifies a pod.

func HandleResizing 

func HandleResizing(resize <-chan remotecommand.TerminalSize, resizeFunc func(size remotecommand.TerminalSize))

handleResizing spawns a goroutine that processes the resize channel, calling resizeFunc for each remotecommand.TerminalSize received from the channel. The resize channel must be closed elsewhere to stop the goroutine.

func HasPrivilegedContainer 

func HasPrivilegedContainer(pod *v1.Pod) bool

HasPrivilegedContainer returns true if any of the containers in the pod are privileged.

func HashContainer 

func HashContainer(container *v1.Container) uint64

HashContainer returns the hash of the container. It is used to compare the running container with its desired spec.

func HashContainerLegacy 

func HashContainerLegacy(container *v1.Container) uint64

HashContainerLegacy returns the hash of the container. It is used to compare the running container with its desired spec. This is used by rktnetes and dockershim (for handling <=1.5 containers). TODO: Remove this function when kubernetes version is >=1.8 AND rktnetes update its hash function.

func IsHostNetworkPod 

func IsHostNetworkPod(pod *v1.Pod) bool

Pod must not be nil.

func MakeCapabilities 

func MakeCapabilities(capAdd []v1.Capability, capDrop []v1.Capability) ([]string, []string)

MakeCapabilities creates string slices from Capability slices

func ParsePodFullName 

func ParsePodFullName(podFullName string) (string, string, error)

Parse the pod full name.

func ShouldContainerBeRestarted 

func ShouldContainerBeRestarted(container *v1.Container, pod *v1.Pod, podStatus *PodStatus) bool

ShouldContainerBeRestarted checks whether a container needs to be restarted. TODO(yifan): Think about how to refactor this.

func StartPty 

func StartPty(c *exec.Cmd) (*os.File, error)

func V1EnvVarsToMap 

func V1EnvVarsToMap(envs []v1.EnvVar) map[string]string

V1EnvVarsToMap constructs a map of environment name to value from a slice of env vars.

Types

type Cache 

type Cache interface {
	Get(types.UID) (*PodStatus, error)
	Set(types.UID, *PodStatus, error, time.Time)
	// GetNewerThan is a blocking call that only returns the status
	// when it is newer than the given time.
	GetNewerThan(types.UID, time.Time) (*PodStatus, error)
	Delete(types.UID)
	UpdateTime(time.Time)
}

Cache stores the PodStatus for the pods. It represents *all* the visible pods/containers in the container runtime. All cache entries are at least as new or newer than the global timestamp (set by UpdateTime()), while individual entries may be slightly newer than the global timestamp. If a pod has no states known by the runtime, Cache returns an empty PodStatus object with ID populated.

Cache provides two methods to retrive the PodStatus: the non-blocking Get() and the blocking GetNewerThan() method. The component responsible for populating the cache is expected to call Delete() to explicitly free the cache entries.

func NewCache 

func NewCache() Cache

NewCache creates a pod cache.

type Container 

type Container struct {
	// The ID of the container, used by the container runtime to identify
	// a container.
	ID ContainerID
	// The name of the container, which should be the same as specified by
	// v1.Container.
	Name string
	// The image name of the container, this also includes the tag of the image,
	// the expected form is "NAME:TAG".
	Image string
	// The id of the image used by the container.
	ImageID string
	// Hash of the container, used for comparison. Optional for containers
	// not managed by kubelet.
	Hash uint64
	// State is the state of the container.
	State ContainerState
}

Container provides the runtime information for a container, such as ID, hash, state of the container.

type ContainerAttacher 

type ContainerAttacher interface {
	AttachContainer(id ContainerID, stdin io.Reader, stdout, stderr io.WriteCloser, tty bool, resize <-chan remotecommand.TerminalSize) (err error)
}

type ContainerCommandRunner 

type ContainerCommandRunner interface {
	// RunInContainer synchronously executes the command in the container, and returns the output.
	// If the command completes with a non-0 exit code, a pkg/util/exec.ExitError will be returned.
	RunInContainer(id ContainerID, cmd []string, timeout time.Duration) ([]byte, error)
}

func DirectStreamingRunner 

func DirectStreamingRunner(runtime DirectStreamingRuntime) ContainerCommandRunner

type ContainerGC 

type ContainerGC interface {
	// Garbage collect containers.
	GarbageCollect() error
	// Deletes all unused containers, including containers belonging to pods that are terminated but not deleted
	DeleteAllUnusedContainers() error
}

Manages garbage collection of dead containers.

Implementation is thread-compatible.

func NewContainerGC 

func NewContainerGC(runtime Runtime, policy ContainerGCPolicy, sourcesReadyProvider SourcesReadyProvider) (ContainerGC, error)

New ContainerGC instance with the specified policy.

type ContainerGCPolicy 

type ContainerGCPolicy struct {
	// Minimum age at which a container can be garbage collected, zero for no limit.
	MinAge time.Duration

	// Max number of dead containers any single pod (UID, container name) pair is
	// allowed to have, less than zero for no limit.
	MaxPerPodContainer int

	// Max number of total dead containers, less than zero for no limit.
	MaxContainers int
}

Specified a policy for garbage collecting containers.

type ContainerID 

type ContainerID struct {
	// The type of the container runtime. e.g. 'docker', 'rkt'.
	Type string
	// The identification of the container, this is comsumable by
	// the underlying container runtime. (Note that the container
	// runtime interface still takes the whole struct as input).
	ID string
}

ContainerID is a type that identifies a container.

func BuildContainerID 

func BuildContainerID(typ, ID string) ContainerID

func ParseContainerID 

func ParseContainerID(containerID string) ContainerID

Convenience method for creating a ContainerID from an ID string.

func (*ContainerID) IsEmpty 

func (c *ContainerID) IsEmpty() bool

func (*ContainerID) MarshalJSON 

func (c *ContainerID) MarshalJSON() ([]byte, error)

func (*ContainerID) ParseString 

func (c *ContainerID) ParseString(data string) error

func (*ContainerID) String 

func (c *ContainerID) String() string

func (*ContainerID) UnmarshalJSON 

func (c *ContainerID) UnmarshalJSON(data []byte) error

type ContainerState 

type ContainerState string
const (
	ContainerStateCreated ContainerState = "created"
	ContainerStateRunning ContainerState = "running"
	ContainerStateExited  ContainerState = "exited"
	// This unknown encompasses all the states that we currently don't care.
	ContainerStateUnknown ContainerState = "unknown"
)

func SandboxToContainerState 

func SandboxToContainerState(state runtimeapi.PodSandboxState) ContainerState

SandboxToContainerState converts runtimeapi.PodSandboxState to kubecontainer.ContainerState. This is only needed because we need to return sandboxes as if they were kubecontainer.Containers to avoid substantial changes to PLEG. TODO: Remove this once it becomes obsolete.

type ContainerStatus 

type ContainerStatus struct {
	// ID of the container.
	ID ContainerID
	// Name of the container.
	Name string
	// Status of the container.
	State ContainerState
	// Creation time of the container.
	CreatedAt time.Time
	// Start time of the container.
	StartedAt time.Time
	// Finish time of the container.
	FinishedAt time.Time
	// Exit code of the container.
	ExitCode int
	// Name of the image, this also includes the tag of the image,
	// the expected form is "NAME:TAG".
	Image string
	// ID of the image.
	ImageID string
	// Hash of the container, used for comparison.
	Hash uint64
	// Number of times that the container has been restarted.
	RestartCount int
	// A string explains why container is in such a status.
	Reason string
	// Message written by the container before exiting (stored in
	// TerminationMessagePath).
	Message string
}

ContainerStatus represents the status of a container.

type DeviceInfo 

type DeviceInfo struct {
	// Path on host for mapping
	PathOnHost string
	// Path in Container to map
	PathInContainer string
	// Cgroup permissions
	Permissions string
}

type DirectStreamingRuntime 

type DirectStreamingRuntime interface {
	// Runs the command in the container of the specified pod using nsenter.
	// Attaches the processes stdin, stdout, and stderr. Optionally uses a
	// tty.
	ExecInContainer(containerID ContainerID, cmd []string, stdin io.Reader, stdout, stderr io.WriteCloser, tty bool, resize <-chan remotecommand.TerminalSize, timeout time.Duration) error
	// Forward the specified port from the specified pod to the stream.
	PortForward(pod *Pod, port int32, stream io.ReadWriteCloser) error
	// ContainerAttach encapsulates the attaching to containers for testability
	ContainerAttacher
}

DirectStreamingRuntime is the interface implemented by runtimes for which the streaming calls (exec/attach/port-forward) should be served directly by the Kubelet.

type DockerID 

type DockerID string

DockerID is an ID of docker container. It is a type to make it clear when we're working with docker container Ids

func (DockerID) ContainerID 

func (id DockerID) ContainerID() ContainerID

type EnvVar 

type EnvVar struct {
	Name  string
	Value string
}

type HandlerRunner 

type HandlerRunner interface {
	Run(containerID ContainerID, pod *v1.Pod, container *v1.Container, handler *v1.Handler) (string, error)
}

HandlerRunner runs a lifecycle handler for a container.

type Image 

type Image struct {
	// ID of the image.
	ID string
	// Other names by which this image is known.
	RepoTags []string
	// Digests by which this image is known.
	RepoDigests []string
	// The size of the image in bytes.
	Size int64
}

Basic information about a container image.

type ImageService 

type ImageService interface {
	// PullImage pulls an image from the network to local storage using the supplied
	// secrets if necessary. It returns a reference (digest or ID) to the pulled image.
	PullImage(image ImageSpec, pullSecrets []v1.Secret) (string, error)
	// GetImageRef gets the reference (digest or ID) of the image which has already been in
	// the local storage. It returns ("", nil) if the image isn't in the local storage.
	GetImageRef(image ImageSpec) (string, error)
	// Gets all images currently on the machine.
	ListImages() ([]Image, error)
	// Removes the specified image.
	RemoveImage(image ImageSpec) error
	// Returns Image statistics.
	ImageStats() (*ImageStats, error)
}

type ImageSpec 

type ImageSpec struct {
	Image string
}

ImageSpec is an internal representation of an image. Currently, it wraps the value of a Container's Image field, but in the future it will include more detailed information about the different image types.

type ImageStats 

type ImageStats struct {
	// Total amount of storage consumed by existing images.
	TotalStorageBytes uint64
}

ImageStats contains statistics about all the images currently available.

type IndirectStreamingRuntime 

type IndirectStreamingRuntime interface {
	GetExec(id ContainerID, cmd []string, stdin, stdout, stderr, tty bool) (*url.URL, error)
	GetAttach(id ContainerID, stdin, stdout, stderr, tty bool) (*url.URL, error)
	GetPortForward(podName, podNamespace string, podUID types.UID, ports []int32) (*url.URL, error)
}

IndirectStreamingRuntime is the interface implemented by runtimes that handle the serving of the streaming calls (exec/attach/port-forward) themselves. In this case, Kubelet should redirect to the runtime server.

type Mount 

type Mount struct {
	// Name of the volume mount.
	// TODO(yifan): Remove this field, as this is not representing the unique name of the mount,
	// but the volume name only.
	Name string
	// Path of the mount within the container.
	ContainerPath string
	// Path of the mount on the host.
	HostPath string
	// Whether the mount is read-only.
	ReadOnly bool
	// Whether the mount needs SELinux relabeling
	SELinuxRelabel bool
	// Requested propagation mode
	Propagation runtimeapi.MountPropagation
}

type OSInterface 

type OSInterface interface {
	MkdirAll(path string, perm os.FileMode) error
	Symlink(oldname string, newname string) error
	Stat(path string) (os.FileInfo, error)
	Remove(path string) error
	RemoveAll(path string) error
	Create(path string) (*os.File, error)
	Chmod(path string, perm os.FileMode) error
	Hostname() (name string, err error)
	Chtimes(path string, atime time.Time, mtime time.Time) error
	Pipe() (r *os.File, w *os.File, err error)
	ReadDir(dirname string) ([]os.FileInfo, error)
	Glob(pattern string) ([]string, error)
}

OSInterface collects system level operations that need to be mocked out during tests.

type Option 

type Option func(Runtime)

Option is a functional option type for Runtime, useful for completely optional settings.

type Pod 

type Pod struct {
	// The ID of the pod, which can be used to retrieve a particular pod
	// from the pod list returned by GetPods().
	ID types.UID
	// The name and namespace of the pod, which is readable by human.
	Name      string
	Namespace string
	// List of containers that belongs to this pod. It may contain only
	// running containers, or mixed with dead ones (when GetPods(true)).
	Containers []*Container
	// List of sandboxes associated with this pod. The sandboxes are converted
	// to Container temporariliy to avoid substantial changes to other
	// components. This is only populated by kuberuntime.
	// TODO: use the runtimeApi.PodSandbox type directly.
	Sandboxes []*Container
}

Pod is a group of containers.

func ConvertPodStatusToRunningPod 

func ConvertPodStatusToRunningPod(runtimeName string, podStatus *PodStatus) Pod

TODO(random-liu): Convert PodStatus to running Pod, should be deprecated soon

func (*Pod) FindContainerByID 

func (p *Pod) FindContainerByID(id ContainerID) *Container

func (*Pod) FindContainerByName 

func (p *Pod) FindContainerByName(containerName string) *Container

FindContainerByName returns a container in the pod with the given name. When there are multiple containers with the same name, the first match will be returned.

func (*Pod) FindSandboxByID 

func (p *Pod) FindSandboxByID(id ContainerID) *Container

func (*Pod) IsEmpty 

func (p *Pod) IsEmpty() bool

IsEmpty returns true if the pod is empty.

func (*Pod) ToAPIPod 

func (p *Pod) ToAPIPod() *v1.Pod

ToAPIPod converts Pod to v1.Pod. Note that if a field in v1.Pod has no corresponding field in Pod, the field would not be populated.

type PodPair 

type PodPair struct {
	// APIPod is the v1.Pod
	APIPod *v1.Pod
	// RunningPod is the pod defined in pkg/kubelet/container/runtime#Pod
	RunningPod *Pod
}

PodPair contains both runtime#Pod and api#Pod

type PodStatus 

type PodStatus struct {
	// ID of the pod.
	ID types.UID
	// Name of the pod.
	Name string
	// Namspace of the pod.
	Namespace string
	// IP of the pod.
	IP string
	// Status of containers in the pod.
	ContainerStatuses []*ContainerStatus
	// Status of the pod sandbox.
	// Only for kuberuntime now, other runtime may keep it nil.
	SandboxStatuses []*runtimeapi.PodSandboxStatus
}

PodStatus represents the status of the pod and its containers. v1.PodStatus can be derived from examining PodStatus and v1.Pod.

func (*PodStatus) FindContainerStatusByName 

func (podStatus *PodStatus) FindContainerStatusByName(containerName string) *ContainerStatus

FindContainerStatusByName returns container status in the pod status with the given name. When there are multiple containers' statuses with the same name, the first match will be returned.

func (*PodStatus) GetRunningContainerStatuses 

func (podStatus *PodStatus) GetRunningContainerStatuses() []*ContainerStatus

Get container status of all the running containers in a pod

type PodSyncResult 

type PodSyncResult struct {
	// Result of different sync actions
	SyncResults []*SyncResult
	// Error encountered in SyncPod() and KillPod() that is not already included in SyncResults
	SyncError error
}

PodSyncResult is the summary result of SyncPod() and KillPod()

func (*PodSyncResult) AddPodSyncResult 

func (p *PodSyncResult) AddPodSyncResult(result PodSyncResult)

AddPodSyncResult merges a PodSyncResult to current one

func (*PodSyncResult) AddSyncResult 

func (p *PodSyncResult) AddSyncResult(result ...*SyncResult)

AddSyncResult adds multiple SyncResult to current PodSyncResult

func (*PodSyncResult) Error 

func (p *PodSyncResult) Error() error

Error returns an error summarizing all the errors in PodSyncResult

func (*PodSyncResult) Fail 

func (p *PodSyncResult) Fail(err error)

Fail fails the PodSyncResult with an error occurred in SyncPod() and KillPod() itself

type Pods 

type Pods []*Pod

func (Pods) FindPod 

func (p Pods) FindPod(podFullName string, podUID types.UID) Pod

FindPod combines FindPodByID and FindPodByFullName, it finds and returns a pod in the pod list either by the full name or the pod ID. It will return an empty pod if not found.

func (Pods) FindPodByFullName 

func (p Pods) FindPodByFullName(podFullName string) Pod

FindPodByFullName finds and returns a pod in the pod list by the full name. It will return an empty pod if not found.

func (Pods) FindPodByID 

func (p Pods) FindPodByID(podUID types.UID) Pod

FindPodByID finds and returns a pod in the pod list by UID. It will return an empty pod if not found.

type PortMapping 

type PortMapping struct {
	// Name of the port mapping
	Name string
	// Protocol of the port mapping.
	Protocol v1.Protocol
	// The port number within the container.
	ContainerPort int
	// The port number on the host.
	HostPort int
	// The host IP.
	HostIP string
}

func MakePortMappings 

func MakePortMappings(container *v1.Container) (ports []PortMapping)

MakePortMappings creates internal port mapping from api port mapping.

type RealOS 

type RealOS struct{}

RealOS is used to dispatch the real system level operations.

func (RealOS) Chmod 

func (RealOS) Chmod(path string, perm os.FileMode) error

Chmod will change the permissions on the specified path or return an error.

func (RealOS) Chtimes 

func (RealOS) Chtimes(path string, atime time.Time, mtime time.Time) error

Chtimes will call os.Chtimes to change the atime and mtime of the path

func (RealOS) Create 

func (RealOS) Create(path string) (*os.File, error)

Create will call os.Create to create and return a file at path.

func (RealOS) Glob 

func (RealOS) Glob(pattern string) ([]string, error)

Glob will call filepath.Glob to return the names of all files matching pattern.

func (RealOS) Hostname 

func (RealOS) Hostname() (name string, err error)

Hostname will call os.Hostname to return the hostname.

func (RealOS) MkdirAll 

func (RealOS) MkdirAll(path string, perm os.FileMode) error

MkDir will will call os.Mkdir to create a directory.

func (RealOS) Pipe 

func (RealOS) Pipe() (r *os.File, w *os.File, err error)

Pipe will call os.Pipe to return a connected pair of pipe.

func (RealOS) ReadDir 

func (RealOS) ReadDir(dirname string) ([]os.FileInfo, error)

ReadDir will call ioutil.ReadDir to return the files under the directory.

func (RealOS) Remove 

func (RealOS) Remove(path string) error

Remove will call os.Remove to remove the path.

func (RealOS) RemoveAll 

func (RealOS) RemoveAll(path string) error

RemoveAll will call os.RemoveAll to remove the path and its children.

func (RealOS) Stat 

func (RealOS) Stat(path string) (os.FileInfo, error)

Stat will call os.Stat to get the FileInfo for a given path 

func (RealOS) Symlink(oldname string, newname string) error

Symlink will call os.Symlink to create a symbolic link.

type RefManager 

type RefManager struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

RefManager manages the references for the containers. The references are used for reporting events such as creation, failure, etc. This manager is thread-safe, no locks are necessary for the caller.

func NewRefManager 

func NewRefManager() *RefManager

NewRefManager creates and returns a container reference manager with empty contents.

func (*RefManager) ClearRef 

func (c *RefManager) ClearRef(id ContainerID)

ClearRef forgets the given container id and its associated container reference.

func (*RefManager) GetRef 

func (c *RefManager) GetRef(id ContainerID) (ref *v1.ObjectReference, ok bool)

GetRef returns the container reference of the given ID, or (nil, false) if none is stored.

func (*RefManager) SetRef 

func (c *RefManager) SetRef(id ContainerID, ref *v1.ObjectReference)

SetRef stores a reference to a pod's container, associating it with the given container ID.

type RunContainerOptions 

type RunContainerOptions struct {
	// The environment variables list.
	Envs []EnvVar
	// The mounts for the containers.
	Mounts []Mount
	// The host devices mapped into the containers.
	Devices []DeviceInfo
	// The port mappings for the containers.
	PortMappings []PortMapping
	// If the container has specified the TerminationMessagePath, then
	// this directory will be used to create and mount the log file to
	// container.TerminationMessagePath
	PodContainerDir string
	// The list of DNS servers for the container to use.
	DNS []string
	// The list of DNS search domains.
	DNSSearch []string
	// The parent cgroup to pass to Docker
	CgroupParent string
	// The type of container rootfs
	ReadOnly bool
	// hostname for pod containers
	Hostname string
	// EnableHostUserNamespace sets userns=host when users request host namespaces (pid, ipc, net),
	// are using non-namespaced capabilities (mknod, sys_time, sys_module), the pod contains a privileged container,
	// or using host path volumes.
	// This should only be enabled when the container runtime is performing user remapping AND if the
	// experimental behavior is desired.
	EnableHostUserNamespace bool
}

RunContainerOptions specify the options which are necessary for running containers

type Runtime 

type Runtime interface {
	// Type returns the type of the container runtime.
	Type() string

	// Version returns the version information of the container runtime.
	Version() (Version, error)

	// APIVersion returns the cached API version information of the container
	// runtime. Implementation is expected to update this cache periodically.
	// This may be different from the runtime engine's version.
	// TODO(random-liu): We should fold this into Version()
	APIVersion() (Version, error)
	// Status returns the status of the runtime. An error is returned if the Status
	// function itself fails, nil otherwise.
	Status() (*RuntimeStatus, error)
	// GetPods returns a list of containers grouped by pods. The boolean parameter
	// specifies whether the runtime returns all containers including those already
	// exited and dead containers (used for garbage collection).
	GetPods(all bool) ([]*Pod, error)
	// GarbageCollect removes dead containers using the specified container gc policy
	// If allSourcesReady is not true, it means that kubelet doesn't have the
	// complete list of pods from all avialble sources (e.g., apiserver, http,
	// file). In this case, garbage collector should refrain itself from aggressive
	// behavior such as removing all containers of unrecognized pods (yet).
	// If evictNonDeletedPods is set to true, containers and sandboxes belonging to pods
	// that are terminated, but not deleted will be evicted.  Otherwise, only deleted pods will be GC'd.
	// TODO: Revisit this method and make it cleaner.
	GarbageCollect(gcPolicy ContainerGCPolicy, allSourcesReady bool, evictNonDeletedPods bool) error
	// Syncs the running pod into the desired pod.
	SyncPod(pod *v1.Pod, apiPodStatus v1.PodStatus, podStatus *PodStatus, pullSecrets []v1.Secret, backOff *flowcontrol.Backoff) PodSyncResult
	// KillPod kills all the containers of a pod. Pod may be nil, running pod must not be.
	// TODO(random-liu): Return PodSyncResult in KillPod.
	// gracePeriodOverride if specified allows the caller to override the pod default grace period.
	// only hard kill paths are allowed to specify a gracePeriodOverride in the kubelet in order to not corrupt user data.
	// it is useful when doing SIGKILL for hard eviction scenarios, or max grace period during soft eviction scenarios.
	KillPod(pod *v1.Pod, runningPod Pod, gracePeriodOverride *int64) error
	// GetPodStatus retrieves the status of the pod, including the
	// information of all containers in the pod that are visble in Runtime.
	GetPodStatus(uid types.UID, name, namespace string) (*PodStatus, error)
	// Returns the filesystem path of the pod's network namespace; if the
	// runtime does not handle namespace creation itself, or cannot return
	// the network namespace path, it should return an error.
	// TODO: Change ContainerID to a Pod ID since the namespace is shared
	// by all containers in the pod.
	GetNetNS(containerID ContainerID) (string, error)
	// Returns the container ID that represents the Pod, as passed to network
	// plugins. For example, if the runtime uses an infra container, returns
	// the infra container's ContainerID.
	// TODO: Change ContainerID to a Pod ID, see GetNetNS()
	GetPodContainerID(*Pod) (ContainerID, 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(pod *v1.Pod, containerID ContainerID, logOptions *v1.PodLogOptions, stdout, stderr io.Writer) (err error)
	// Delete a container. If the container is still running, an error is returned.
	DeleteContainer(containerID ContainerID) error
	// ImageService provides methods to image-related methods.
	ImageService
	// UpdatePodCIDR sends a new podCIDR to the runtime.
	// This method just proxies a new runtimeConfig with the updated
	// CIDR value down to the runtime shim.
	UpdatePodCIDR(podCIDR string) error
}

Runtime interface defines the interfaces that should be implemented by a container runtime. Thread safety is required from implementations of this interface.

type RuntimeCache 

type RuntimeCache interface {
	GetPods() ([]*Pod, error)
	ForceUpdateIfOlder(time.Time) error
}

func NewRuntimeCache 

func NewRuntimeCache(getter podsGetter) (RuntimeCache, error)

NewRuntimeCache creates a container runtime cache.

type RuntimeCondition 

type RuntimeCondition struct {
	// Type of runtime condition.
	Type RuntimeConditionType
	// Status of the condition, one of true/false.
	Status bool
	// Reason is brief reason for the condition's last transition.
	Reason string
	// Message is human readable message indicating details about last transition.
	Message string
}

RuntimeCondition contains condition information for the runtime.

func (*RuntimeCondition) String 

func (c *RuntimeCondition) String() string

String formats the runtime condition into human readable string.

type RuntimeConditionType 

type RuntimeConditionType string

RuntimeConditionType is the types of required runtime conditions. 

const (
	// RuntimeReady means the runtime is up and ready to accept basic containers.
	RuntimeReady RuntimeConditionType = "RuntimeReady"
	// NetworkReady means the runtime network is up and ready to accept containers which require network.
	NetworkReady RuntimeConditionType = "NetworkReady"
)

type RuntimeHelper 

type RuntimeHelper interface {
	GenerateRunContainerOptions(pod *v1.Pod, container *v1.Container, podIP string) (contOpts *RunContainerOptions, useClusterFirstPolicy bool, err error)
	GetClusterDNS(pod *v1.Pod) (dnsServers []string, dnsSearches []string, useClusterFirstPolicy bool, err error)
	// GetPodCgroupParent returns the the CgroupName identifer, and its literal cgroupfs form on the host
	// of a pod.
	GetPodCgroupParent(pod *v1.Pod) string
	GetPodDir(podUID types.UID) string
	GeneratePodHostNameAndDomain(pod *v1.Pod) (hostname string, hostDomain string, err error)
	// GetExtraSupplementalGroupsForPod returns a list of the extra
	// supplemental groups for the Pod. These extra supplemental groups come
	// from annotations on persistent volumes that the pod depends on.
	GetExtraSupplementalGroupsForPod(pod *v1.Pod) []int64
}

RuntimeHelper wraps kubelet to make container runtime able to get necessary informations like the RunContainerOptions, DNS settings, Host IP.

type RuntimeStatus 

type RuntimeStatus struct {
	// Conditions is an array of current observed runtime conditions.
	Conditions []RuntimeCondition
}

RuntimeStatus contains the status of the runtime.

func (*RuntimeStatus) GetRuntimeCondition 

func (r *RuntimeStatus) GetRuntimeCondition(t RuntimeConditionType) *RuntimeCondition

GetRuntimeCondition gets a specified runtime condition from the runtime status.

func (*RuntimeStatus) String 

func (s *RuntimeStatus) String() string

String formats the runtime status into human readable string.

type SortContainerStatusesByCreationTime 

type SortContainerStatusesByCreationTime []*ContainerStatus

Sort the container statuses by creation time.

func (SortContainerStatusesByCreationTime) Len 

func (s SortContainerStatusesByCreationTime) Len() int

func (SortContainerStatusesByCreationTime) Less 

func (s SortContainerStatusesByCreationTime) Less(i, j int) bool

func (SortContainerStatusesByCreationTime) Swap 

func (s SortContainerStatusesByCreationTime) Swap(i, j int)

type SourcesReadyProvider 

type SourcesReadyProvider interface {
	// AllReady returns true if the currently configured sources have all been seen.
	AllReady() bool
}

SourcesReadyProvider knows how to determine if configuration sources are ready

type SyncAction 

type SyncAction string

SyncAction indicates different kind of actions in SyncPod() and KillPod(). Now there are only actions about start/kill container and setup/teardown network. 

const (
	StartContainer   SyncAction = "StartContainer"
	KillContainer    SyncAction = "KillContainer"
	SetupNetwork     SyncAction = "SetupNetwork"
	TeardownNetwork  SyncAction = "TeardownNetwork"
	InitContainer    SyncAction = "InitContainer"
	CreatePodSandbox SyncAction = "CreatePodSandbox"
	ConfigPodSandbox SyncAction = "ConfigPodSandbox"
	KillPodSandbox   SyncAction = "KillPodSandbox"
)

type SyncResult 

type SyncResult struct {
	// The associated action of the result
	Action SyncAction
	// The target of the action, now the target can only be:
	//  * Container: Target should be container name
	//  * Network: Target is useless now, we just set it as pod full name now
	Target interface{}
	// Brief error reason
	Error error
	// Human readable error reason
	Message string
}

SyncResult is the result of sync action.

func NewSyncResult 

func NewSyncResult(action SyncAction, target interface{}) *SyncResult

NewSyncResult generates new SyncResult with specific Action and Target

func (*SyncResult) Fail 

func (r *SyncResult) Fail(err error, msg string)

Fail fails the SyncResult with specific error and message

type TestRuntimeCache 

type TestRuntimeCache struct {
	// contains filtered or unexported fields
}

TestRunTimeCache embeds runtimeCache with some additional methods for testing. It must be declared in the container package to have visibility to runtimeCache. It cannot be in a "..._test.go" file in order for runtime_cache_test.go to have cross-package visibility to it. (cross-package declarations in test files cannot be used from dot imports if this package is vendored)

func NewTestRuntimeCache 

func NewTestRuntimeCache(getter podsGetter) *TestRuntimeCache

func (*TestRuntimeCache) ForceUpdateIfOlder 

func (r *TestRuntimeCache) ForceUpdateIfOlder(minExpectedCacheTime time.Time) error

func (*TestRuntimeCache) GetCachedPods 

func (r *TestRuntimeCache) GetCachedPods() []*Pod

func (*TestRuntimeCache) GetPods 

func (r *TestRuntimeCache) GetPods() ([]*Pod, error)

GetPods returns the cached pods if they are not outdated; otherwise, it retrieves the latest pods and return them.

func (*TestRuntimeCache) UpdateCacheWithLock 

func (r *TestRuntimeCache) UpdateCacheWithLock() error

type Version 

type Version interface {
	// Compare compares two versions of the runtime. On success it returns -1
	// if the version is less than the other, 1 if it is greater than the other,
	// or 0 if they are equal.
	Compare(other string) (int, error)
	// String returns a string that represents the version.
	String() string
}

type VolumeInfo 

type VolumeInfo struct {
	// Mounter is the volume's mounter
	Mounter volume.Mounter
	// SELinuxLabeled indicates whether this volume has had the
	// pod's SELinux label applied to it or not
	SELinuxLabeled bool
}

VolumeInfo contains information about the volume.

type VolumeMap 

type VolumeMap map[string]VolumeInfo

Source Files

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Directories

Path Synopsis
Code generated by mockery v1.0.0
 Code generated by mockery v1.0.0

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