docker

Documentation

Index

• Constants
• Variables
• func ContainerIsStopped(c Container) bool
• func ExtractContainerIPs(nmd report.Node) []string
• func ExtractContainerIPsWithScopes(nmd report.Node) []string
• func ImageNameWithoutVersion(name string) string
• type Client
• type ClientConn
• type Container
  • func NewContainer(c *docker.Container, hostID string) Container
• type ContainerUpdateWatcher
• type Registry
  • func NewRegistry(interval time.Duration, pipes controls.PipeClient, collectStats bool, ...) (Registry, error)
• type Reporter
  • func NewReporter(registry Registry, hostID string, probeID string, probe *probe.Probe) *Reporter
  • func (r *Reporter) ContainerUpdated(n report.Node)
  • func (Reporter) Name() string
  • func (r *Reporter) Report() (report.Report, error)
• type Tagger
  • func NewTagger(registry Registry, procWalker process.Walker) *Tagger
  • func (Tagger) Name() string
  • func (t *Tagger) Tag(r report.Report) (report.Report, error)

Constants

const (
	ContainerName          = "docker_container_name"
	ContainerCommand       = "docker_container_command"
	ContainerPorts         = "docker_container_ports"
	ContainerCreated       = "docker_container_created"
	ContainerNetworks      = "docker_container_networks"
	ContainerIPs           = "docker_container_ips"
	ContainerHostname      = "docker_container_hostname"
	ContainerIPsWithScopes = "docker_container_ips_with_scopes"
	ContainerState         = "docker_container_state"
	ContainerStateHuman    = "docker_container_state_human"
	ContainerUptime        = "docker_container_uptime"
	ContainerRestartCount  = "docker_container_restart_count"
	ContainerNetworkMode   = "docker_container_network_mode"

	NetworkRxDropped = "network_rx_dropped"
	NetworkRxBytes   = "network_rx_bytes"
	NetworkRxErrors  = "network_rx_errors"
	NetworkTxPackets = "network_tx_packets"
	NetworkTxDropped = "network_tx_dropped"
	NetworkRxPackets = "network_rx_packets"
	NetworkTxErrors  = "network_tx_errors"
	NetworkTxBytes   = "network_tx_bytes"

	MemoryMaxUsage = "docker_memory_max_usage"
	MemoryUsage    = "docker_memory_usage"
	MemoryFailcnt  = "docker_memory_failcnt"
	MemoryLimit    = "docker_memory_limit"

	CPUPercpuUsage       = "docker_cpu_per_cpu_usage"
	CPUUsageInUsermode   = "docker_cpu_usage_in_usermode"
	CPUTotalUsage        = "docker_cpu_total_usage"
	CPUUsageInKernelmode = "docker_cpu_usage_in_kernelmode"
	CPUSystemCPUUsage    = "docker_cpu_system_cpu_usage"

	NetworkModeHost = "host"

	LabelPrefix = "docker_label_"
	EnvPrefix   = "docker_env_"
)

These constants are keys used in node metadata

const (
	StopContainer    = "docker_stop_container"
	StartContainer   = "docker_start_container"
	RestartContainer = "docker_restart_container"
	PauseContainer   = "docker_pause_container"
	UnpauseContainer = "docker_unpause_container"
	RemoveContainer  = "docker_remove_container"
	AttachContainer  = "docker_attach_container"
	ExecContainer    = "docker_exec_container"
)

Control IDs used by the docker integration.

const (
	CreateEvent            = "create"
	DestroyEvent           = "destroy"
	RenameEvent            = "rename"
	StartEvent             = "start"
	DieEvent               = "die"
	PauseEvent             = "pause"
	UnpauseEvent           = "unpause"
	NetworkConnectEvent    = "network:connect"
	NetworkDisconnectEvent = "network:disconnect"
)

Consts exported for testing.

const (
	ImageID           = "docker_image_id"
	ImageName         = "docker_image_name"
	ImageLabelPrefix  = "docker_image_label_"
	OverlayPeerPrefix = "docker_peer_"
	IsInHostNetwork   = "docker_is_in_host_network"
)

Keys for use in Node

const (
	ContainerID = "docker_container_id"
	Domain      = "domain" // TODO this is ambiguous, be more specific
	Name        = "name"   // TODO this is ambiguous, be more specific
)

Node metadata keys.

Variables

var (
	StateCreated    = "created"
	StateDead       = "dead"
	StateExited     = "exited"
	StatePaused     = "paused"
	StateRestarting = "restarting"
	StateRunning    = "running"
	StateDeleted    = "deleted"
)

These 'constants' are used for node states. We need to take pointers to them, so they are vars...

var (
	DialStub          = net.Dial
	NewClientConnStub = newClientConn
)

Exported for testing

var (
	NewDockerClientStub = newDockerClient
	NewContainerStub    = NewContainer
)

Vars exported for testing.

var (
	ContainerMetadataTemplates = report.MetadataTemplates{
		ContainerID:           {ID: ContainerID, Label: "ID", From: report.FromLatest, Truncate: 12, Priority: 1},
		ContainerStateHuman:   {ID: ContainerStateHuman, Label: "State", From: report.FromLatest, Priority: 2},
		ContainerCommand:      {ID: ContainerCommand, Label: "Command", From: report.FromLatest, Priority: 3},
		ImageID:               {ID: ImageID, Label: "Image ID", From: report.FromLatest, Truncate: 12, Priority: 11},
		ContainerUptime:       {ID: ContainerUptime, Label: "Uptime", From: report.FromLatest, Priority: 12},
		ContainerRestartCount: {ID: ContainerRestartCount, Label: "Restart #", From: report.FromLatest, Priority: 13},
		ContainerNetworks:     {ID: ContainerNetworks, Label: "Networks", From: report.FromSets, Priority: 14},
		ContainerIPs:          {ID: ContainerIPs, Label: "IPs", From: report.FromSets, Priority: 15},
		ContainerPorts:        {ID: ContainerPorts, Label: "Ports", From: report.FromSets, Priority: 16},
		ContainerCreated:      {ID: ContainerCreated, Label: "Created", From: report.FromLatest, Priority: 17},
	}

	ContainerMetricTemplates = report.MetricTemplates{
		CPUTotalUsage: {ID: CPUTotalUsage, Label: "CPU", Format: report.PercentFormat, Priority: 1},
		MemoryUsage:   {ID: MemoryUsage, Label: "Memory", Format: report.FilesizeFormat, Priority: 2},
	}

	ContainerImageMetadataTemplates = report.MetadataTemplates{
		ImageID:          {ID: ImageID, Label: "Image ID", From: report.FromSets, Truncate: 12, Priority: 1},
		report.Container: {ID: report.Container, Label: "# Containers", From: report.FromCounters, Datatype: "number", Priority: 2},
	}

	ContainerTableTemplates = report.TableTemplates{
		LabelPrefix: {ID: LabelPrefix, Label: "Docker Labels", Prefix: LabelPrefix},
		EnvPrefix:   {ID: EnvPrefix, Label: "Environment Variables", Prefix: EnvPrefix},
	}

	ContainerImageTableTemplates = report.TableTemplates{
		ImageLabelPrefix: {ID: ImageLabelPrefix, Label: "Docker Labels", Prefix: ImageLabelPrefix},
	}

	ContainerControls = []report.Control{
		{
			ID:    AttachContainer,
			Human: "Attach",
			Icon:  "fa-desktop",
			Rank:  1,
		},
		{
			ID:    ExecContainer,
			Human: "Exec shell",
			Icon:  "fa-terminal",
			Rank:  2,
		},
		{
			ID:    StartContainer,
			Human: "Start",
			Icon:  "fa-play",
			Rank:  3,
		},
		{
			ID:    RestartContainer,
			Human: "Restart",
			Icon:  "fa-repeat",
			Rank:  4,
		},
		{
			ID:    PauseContainer,
			Human: "Pause",
			Icon:  "fa-pause",
			Rank:  5,
		},
		{
			ID:    UnpauseContainer,
			Human: "Unpause",
			Icon:  "fa-play",
			Rank:  6,
		},
		{
			ID:    StopContainer,
			Human: "Stop",
			Icon:  "fa-stop",
			Rank:  7,
		},
		{
			ID:    RemoveContainer,
			Human: "Remove",
			Icon:  "fa-trash-o",
			Rank:  8,
		},
	}
)

Exposed for testing

var (
	NewProcessTreeStub = process.NewTree
)

These vars are exported for testing.

Functions

func ContainerIsStopped

func ContainerIsStopped(c Container) bool

ContainerIsStopped checks if the docker container is in one of our "stopped" states

func ExtractContainerIPs

func ExtractContainerIPs(nmd report.Node) []string

ExtractContainerIPs returns the list of container IPs given a Node from the Container topology.

func ExtractContainerIPsWithScopes

func ExtractContainerIPsWithScopes(nmd report.Node) []string

ExtractContainerIPsWithScopes returns the list of container IPs, prepended with scopes, given a Node from the Container topology.

func ImageNameWithoutVersion

func ImageNameWithoutVersion(name string) string

ImageNameWithoutVersion splits the image name apart, returning the name without the version, if possible

Types

type Client

type Client interface {
	ListContainers(docker_client.ListContainersOptions) ([]docker_client.APIContainers, error)
	InspectContainer(string) (*docker_client.Container, error)
	ListImages(docker_client.ListImagesOptions) ([]docker_client.APIImages, error)
	ListNetworks() ([]docker_client.Network, error)
	AddEventListener(chan<- *docker_client.APIEvents) error
	RemoveEventListener(chan *docker_client.APIEvents) error

	StopContainer(string, uint) error
	StartContainer(string, *docker_client.HostConfig) error
	RestartContainer(string, uint) error
	PauseContainer(string) error
	UnpauseContainer(string) error
	RemoveContainer(docker_client.RemoveContainerOptions) error
	AttachToContainerNonBlocking(docker_client.AttachToContainerOptions) (docker_client.CloseWaiter, error)
	CreateExec(docker_client.CreateExecOptions) (*docker_client.Exec, error)
	StartExecNonBlocking(string, docker_client.StartExecOptions) (docker_client.CloseWaiter, error)
}

Client interface for mocking.

type ClientConn

type ClientConn interface {
	Do(req *http.Request) (resp *http.Response, err error)
	Close() error
}

ClientConn is exported for testing

type Container

type Container interface {
	UpdateState(*docker.Container)

	ID() string
	Image() string
	PID() int
	Hostname() string
	GetNode() report.Node
	State() string
	StateString() string
	HasTTY() bool
	Container() *docker.Container
	StartGatheringStats() error
	StopGatheringStats()
	NetworkMode() (string, bool)
	NetworkInfo([]net.IP) report.Sets
}

Container represents a Docker container

func NewContainer

func NewContainer(c *docker.Container, hostID string) Container

NewContainer creates a new Container

type ContainerUpdateWatcher

type ContainerUpdateWatcher func(report.Node)

ContainerUpdateWatcher is the type of functions that get called when containers are updated.

type Registry

type Registry interface {
	Stop()
	LockedPIDLookup(f func(func(int) Container))
	WalkContainers(f func(Container))
	WalkImages(f func(docker_client.APIImages))
	WalkNetworks(f func(docker_client.Network))
	WatchContainerUpdates(ContainerUpdateWatcher)
	GetContainer(string) (Container, bool)
	GetContainerByPrefix(string) (Container, bool)
	GetContainerImage(string) (docker_client.APIImages, bool)
}

Registry keeps track of running docker containers and their images

func NewRegistry

func NewRegistry(interval time.Duration, pipes controls.PipeClient, collectStats bool, hostID string) (Registry, error)

NewRegistry returns a usable Registry. Don't forget to Stop it.

type Reporter

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

Reporter generate Reports containing Container and ContainerImage topologies

func NewReporter

func NewReporter(registry Registry, hostID string, probeID string, probe *probe.Probe) *Reporter

NewReporter makes a new Reporter

func (*Reporter) ContainerUpdated

func (r *Reporter) ContainerUpdated(n report.Node)

ContainerUpdated should be called whenever a container is updated.

func (Reporter) Name

func (Reporter) Name() string

Name of this reporter, for metrics gathering

func (*Reporter) Report

func (r *Reporter) Report() (report.Report, error)

Report generates a Report containing Container and ContainerImage topologies

type Tagger

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

Tagger is a tagger that tags Docker container information to process nodes that have a PID.

func NewTagger

func NewTagger(registry Registry, procWalker process.Walker) *Tagger

NewTagger returns a usable Tagger.

func (Tagger) Name

func (Tagger) Name() string

Name of this tagger, for metrics gathering

func (*Tagger) Tag

func (t *Tagger) Tag(r report.Report) (report.Report, error)

Tag implements Tagger.