dockershim

Documentation

Overview

Package dockershim implements a container runtime interface Docker integration using k8s.io/cri-api/pkg/apis/runtime/v1alpha2/api.pb.go

Index

• Constants
• func DefaultMemorySwap() int64
• func NewDockerClientFromConfig(config *ClientConfig) libdocker.Interface
• type CRIService
• type CheckpointData
• type ClientConfig
• type ContainerCheckpoint
  • func NewPodSandboxCheckpoint(namespace, name string, data *CheckpointData) ContainerCheckpoint
• type DockerService
  • func NewDockerService(config *ClientConfig, podSandboxImage string, ...) (DockerService, error)
• type ExecHandler
• type NativeExecHandler
  • func (*NativeExecHandler) ExecInContainer(ctx context.Context, client libdocker.Interface, ...) error
• type NetworkPluginSettings
• type PodSandboxCheckpoint
  • func (cp *PodSandboxCheckpoint) GetData() (string, string, string, []*PortMapping, bool)
  • func (cp *PodSandboxCheckpoint) MarshalCheckpoint() ([]byte, error)
  • func (cp *PodSandboxCheckpoint) UnmarshalCheckpoint(blob []byte) error
  • func (cp *PodSandboxCheckpoint) VerifyChecksum() error
• 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

DefaultMemorySwap always returns 0 for no memory swap in a sandbox

func NewDockerClientFromConfig

func NewDockerClientFromConfig(config *ClientConfig) libdocker.Interface

NewDockerClientFromConfig create a docker client from given configure return nil if nil configure is given.

Types

type CRIService

type CRIService interface {
	runtimeapi.RuntimeServiceServer
	runtimeapi.ImageServiceServer
	Start() error
}

CRIService includes all methods necessary for a CRI server.

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 ClientConfig

type ClientConfig struct {
	DockerEndpoint            string
	RuntimeRequestTimeout     time.Duration
	ImagePullProgressDeadline time.Duration

	// Configuration for fake docker client
	EnableSleep       bool
	WithTraceDisabled bool
}

ClientConfig is parameters used to initialize docker client

type ContainerCheckpoint

type ContainerCheckpoint interface {
	checkpointmanager.Checkpoint
	GetData() (string, string, string, []*PortMapping, bool)
}

ContainerCheckpoint provides the interface for process container's checkpoint data

func NewPodSandboxCheckpoint

func NewPodSandboxCheckpoint(namespace, name string, data *CheckpointData) ContainerCheckpoint

NewPodSandboxCheckpoint inits a PodSandboxCheckpoint with the given args

type DockerService

type DockerService interface {
	CRIService

	// For serving streaming calls.
	http.Handler

	// For supporting legacy features.
	legacy.DockerLegacyService
}

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

func NewDockerService

func NewDockerService(config *ClientConfig, podSandboxImage string, streamingConfig *streaming.Config, pluginSettings *NetworkPluginSettings,
	cgroupsName string, kubeCgroupDriver string, dockershimRootDir string) (DockerService, error)

NewDockerService creates a new `DockerService` struct. 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(ctx context.Context, 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 NativeExecHandler

type NativeExecHandler struct{}

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

func (*NativeExecHandler) ExecInContainer

func (*NativeExecHandler) ExecInContainer(ctx context.Context, 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

ExecInContainer executes the cmd in container using the Docker's exec API

type NetworkPluginSettings

type NetworkPluginSettings struct {
	// HairpinMode is best described by comments surrounding the kubelet arg
	HairpinMode kubeletconfig.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
	// PluginBinDirString is a list of directiores delimited by commas, in
	// which the binaries for the plugin with PluginName may be found.
	PluginBinDirString string
	// PluginBinDirs is an array of directories in which the binaries for
	// the plugin with PluginName may be found. The admin is responsible for
	// provisioning these binaries before-hand.
	PluginBinDirs []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
	// PluginCacheDir is the directory in which CNI should store cache files.
	PluginCacheDir string
	// MTU is the desired MTU for network devices created by the plugin.
	MTU int
}

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 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 Pod ObjectMeta.
	Name string `json:"name"`
	// Pod namespace of the sandbox. Same as the pod namespace in the Pod ObjectMeta.
	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 checksum.Checksum `json:"checksum"`
}

PodSandboxCheckpoint is the checkpoint structure for a sandbox

func (*PodSandboxCheckpoint) GetData

func (cp *PodSandboxCheckpoint) GetData() (string, string, string, []*PortMapping, bool)

GetData gets the PodSandboxCheckpoint's version and some net information

func (*PodSandboxCheckpoint) MarshalCheckpoint

func (cp *PodSandboxCheckpoint) MarshalCheckpoint() ([]byte, error)

MarshalCheckpoint encodes the PodSandboxCheckpoint instance to a json object

func (*PodSandboxCheckpoint) UnmarshalCheckpoint

func (cp *PodSandboxCheckpoint) UnmarshalCheckpoint(blob []byte) error

UnmarshalCheckpoint decodes the blob data to the PodSandboxCheckpoint instance

func (*PodSandboxCheckpoint) VerifyChecksum

func (cp *PodSandboxCheckpoint) VerifyChecksum() error

VerifyChecksum verifies whether the PodSandboxCheckpoint's data checksum is the same as calculated checksum

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"`
	// Host ip to expose.
	HostIP string `json:"host_ip,omitempty"`
}

PortMapping is the port mapping configurations of a sandbox.

type Protocol

type Protocol string

Protocol is the type of port mapping protocol