dockershim

Documentation

Overview

Docker integration using pkg/kubelet/apis/cri/v1alpha1/runtime/api.pb.go

Index

• Constants
• func DefaultMemorySwap() int64
• func IsCRISupportedLogDriver(client libdocker.Interface) (bool, error)
• type CheckpointData
• type CheckpointHandler
  • func NewPersistentCheckpointHandler(dockershimRootDir string) (CheckpointHandler, error)
• type CheckpointStore
  • func NewFileStore(path string) (CheckpointStore, error)
• type DockerLegacyService
  • func NewDockerLegacyService(client libdocker.Interface) DockerLegacyService
• type DockerService
  • func NewDockerService(client libdocker.Interface, seccompProfileRoot string, podSandboxImage string, ...) (DockerService, error)
• type ExecHandler
• type FileStore
  • func (fstore *FileStore) Delete(key string) error
  • func (fstore *FileStore) List() ([]string, error)
  • func (fstore *FileStore) Read(key string) ([]byte, error)
  • func (fstore *FileStore) Write(key string, data []byte) error
• type NativeExecHandler
  • func (*NativeExecHandler) ExecInContainer(client libdocker.Interface, container *dockertypes.ContainerJSON, cmd []string, ...) error
• type NetworkPluginSettings
• type NsenterExecHandler
  • func (*NsenterExecHandler) ExecInContainer(client libdocker.Interface, container *dockertypes.ContainerJSON, cmd []string, ...) error
• type PersistentCheckpointHandler
  • func (handler *PersistentCheckpointHandler) CreateCheckpoint(podSandboxID string, checkpoint *PodSandboxCheckpoint) error
  • func (handler *PersistentCheckpointHandler) GetCheckpoint(podSandboxID string) (*PodSandboxCheckpoint, error)
  • func (handler *PersistentCheckpointHandler) ListCheckpoints() ([]string, error)
  • func (handler *PersistentCheckpointHandler) RemoveCheckpoint(podSandboxID string) error
• type PodSandboxCheckpoint
  • func NewPodSandboxCheckpoint(namespace, name string) *PodSandboxCheckpoint
• type PortMapping
• type Protocol

Constants

const (

	// DockerImageIDPrefix is the prefix of image id in container status.
	DockerImageIDPrefix = "docker://"
	// DockerPullableImageIDPrefix is the prefix of pullable image id in container status.
	DockerPullableImageIDPrefix = "docker-pullable://"
)

Functions

func DefaultMemorySwap

func DefaultMemorySwap() int64

func IsCRISupportedLogDriver

func IsCRISupportedLogDriver(client libdocker.Interface) (bool, error)

IsCRISupportedLogDriver checks whether the logging driver used by docker is suppoted by native CRI integration.

Types

type CheckpointData

type CheckpointData struct {
	PortMappings []*PortMapping `json:"port_mappings,omitempty"`
	HostNetwork  bool           `json:"host_network,omitempty"`
}

CheckpointData contains all types of data that can be stored in the checkpoint.

type CheckpointHandler

type CheckpointHandler interface {
	// CreateCheckpoint persists sandbox checkpoint in CheckpointStore.
	CreateCheckpoint(podSandboxID string, checkpoint *PodSandboxCheckpoint) error
	// GetCheckpoint retrieves sandbox checkpoint from CheckpointStore.
	GetCheckpoint(podSandboxID string) (*PodSandboxCheckpoint, error)
	// RemoveCheckpoint removes sandbox checkpoint form CheckpointStore.
	// WARNING: RemoveCheckpoint will not return error if checkpoint does not exist.
	RemoveCheckpoint(podSandboxID string) error
	// ListCheckpoint returns the list of existing checkpoints.
	ListCheckpoints() ([]string, error)
}

CheckpointHandler provides the interface to manage PodSandbox checkpoint

func NewPersistentCheckpointHandler

func NewPersistentCheckpointHandler(dockershimRootDir string) (CheckpointHandler, error)

type CheckpointStore

type CheckpointStore interface {
	// key must contain one or more characters in [A-Za-z0-9]
	// Write persists a checkpoint with key
	Write(key string, data []byte) error
	// Read retrieves a checkpoint with key
	// Read must return CheckpointNotFoundError if checkpoint is not found
	Read(key string) ([]byte, error)
	// Delete deletes a checkpoint with key
	// Delete must not return error if checkpoint does not exist
	Delete(key string) error
	// List lists all keys of existing checkpoints
	List() ([]string, error)
}

CheckpointStore provides the interface for checkpoint storage backend. CheckpointStore must be thread-safe

func NewFileStore

func NewFileStore(path string) (CheckpointStore, error)

type DockerLegacyService

type DockerLegacyService interface {
	// GetContainerLogs gets logs for a specific container.
	GetContainerLogs(*v1.Pod, kubecontainer.ContainerID, *v1.PodLogOptions, io.Writer, io.Writer) error
}

DockerLegacyService interface embeds some legacy methods for backward compatibility.

func NewDockerLegacyService

func NewDockerLegacyService(client libdocker.Interface) DockerLegacyService

type DockerService

type DockerService interface {
	internalapi.RuntimeService
	internalapi.ImageManagerService
	Start() error
	// For serving streaming calls.
	http.Handler
}

DockerService is an interface that embeds the new RuntimeService and ImageService interfaces.

func NewDockerService

func NewDockerService(client libdocker.Interface, seccompProfileRoot string, podSandboxImage string, streamingConfig *streaming.Config,
	pluginSettings *NetworkPluginSettings, cgroupsName string, kubeCgroupDriver string, execHandlerName, dockershimRootDir string, disableSharedPID bool) (DockerService, error)

NOTE: Anything passed to DockerService should be eventually handled in another way when we switch to running the shim as a different process.

type ExecHandler

type ExecHandler interface {
	ExecInContainer(client libdocker.Interface, container *dockertypes.ContainerJSON, cmd []string, stdin io.Reader, stdout, stderr io.WriteCloser, tty bool, resize <-chan remotecommand.TerminalSize, timeout time.Duration) error
}

ExecHandler knows how to execute a command in a running Docker container.

type FileStore

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

FileStore is an implementation of CheckpointStore interface which stores checkpoint in files.

func (*FileStore) Delete

func (fstore *FileStore) Delete(key string) error

func (*FileStore) List

func (fstore *FileStore) List() ([]string, error)

func (*FileStore) Read

func (fstore *FileStore) Read(key string) ([]byte, error)

func (*FileStore) Write

func (fstore *FileStore) Write(key string, data []byte) error

type NativeExecHandler

type NativeExecHandler struct{}

NativeExecHandler executes commands in Docker containers using Docker's exec API.

func (*NativeExecHandler) ExecInContainer

func (*NativeExecHandler) ExecInContainer(client libdocker.Interface, container *dockertypes.ContainerJSON, cmd []string, stdin io.Reader, stdout, stderr io.WriteCloser, tty bool, resize <-chan remotecommand.TerminalSize, timeout time.Duration) error

type NetworkPluginSettings

type NetworkPluginSettings struct {
	// HairpinMode is best described by comments surrounding the kubelet arg
	HairpinMode componentconfig.HairpinMode
	// NonMasqueradeCIDR is the range of ips which should *not* be included
	// in any MASQUERADE rules applied by the plugin
	NonMasqueradeCIDR string
	// PluginName is the name of the plugin, runtime shim probes for
	PluginName string
	// PluginBinDir is the directory in which the binaries for the plugin with
	// PluginName is kept. The admin is responsible for provisioning these
	// binaries before-hand.
	PluginBinDir string
	// PluginConfDir is the directory in which the admin places a CNI conf.
	// Depending on the plugin, this may be an optional field, eg: kubenet
	// generates its own plugin conf.
	PluginConfDir string
	// MTU is the desired MTU for network devices created by the plugin.
	MTU int

	// RuntimeHost is an interface that serves as a trap-door from plugin back
	// into the kubelet.
	// TODO: This shouldn't be required, remove once we move host ports into CNI
	// and figure out bandwidth shaping. See corresponding comments above
	// network.Host interface.
	LegacyRuntimeHost network.LegacyHost
}

NetworkPluginSettings is the subset of kubelet runtime args we pass to the container runtime shim so it can probe for network plugins. In the future we will feed these directly to a standalone container runtime process.

type NsenterExecHandler

type NsenterExecHandler struct{}

NsenterExecHandler executes commands in Docker containers using nsenter.

func (*NsenterExecHandler) ExecInContainer

func (*NsenterExecHandler) ExecInContainer(client libdocker.Interface, container *dockertypes.ContainerJSON, cmd []string, stdin io.Reader, stdout, stderr io.WriteCloser, tty bool, resize <-chan remotecommand.TerminalSize, timeout time.Duration) error

TODO should we support nsenter in a container, running with elevated privs and --pid=host?

type PersistentCheckpointHandler

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

PersistentCheckpointHandler is an implementation of CheckpointHandler. It persists checkpoint in CheckpointStore

func (*PersistentCheckpointHandler) CreateCheckpoint

func (handler *PersistentCheckpointHandler) CreateCheckpoint(podSandboxID string, checkpoint *PodSandboxCheckpoint) error

func (*PersistentCheckpointHandler) GetCheckpoint

func (handler *PersistentCheckpointHandler) GetCheckpoint(podSandboxID string) (*PodSandboxCheckpoint, error)

func (*PersistentCheckpointHandler) ListCheckpoints

func (handler *PersistentCheckpointHandler) ListCheckpoints() ([]string, error)

func (*PersistentCheckpointHandler) RemoveCheckpoint

func (handler *PersistentCheckpointHandler) RemoveCheckpoint(podSandboxID string) error

type PodSandboxCheckpoint

type PodSandboxCheckpoint struct {
	// Version of the pod sandbox checkpoint schema.
	Version string `json:"version"`
	// Pod name of the sandbox. Same as the pod name in the PodSpec.
	Name string `json:"name"`
	// Pod namespace of the sandbox. Same as the pod namespace in the PodSpec.
	Namespace string `json:"namespace"`
	// Data to checkpoint for pod sandbox.
	Data *CheckpointData `json:"data,omitempty"`
	// Checksum is calculated with fnv hash of the checkpoint object with checksum field set to be zero
	CheckSum uint64 `json:"checksum"`
}

PodSandboxCheckpoint is the checkpoint structure for a sandbox

func NewPodSandboxCheckpoint

func NewPodSandboxCheckpoint(namespace, name string) *PodSandboxCheckpoint

type PortMapping

type PortMapping struct {
	// Protocol of the port mapping.
	Protocol *Protocol `json:"protocol,omitempty"`
	// Port number within the container.
	ContainerPort *int32 `json:"container_port,omitempty"`
	// Port number on the host.
	HostPort *int32 `json:"host_port,omitempty"`
}

PortMapping is the port mapping configurations of a sandbox.

type Protocol

type Protocol string