container

Documentation

Overview

Package container defines types for sub-container events and also defines an interface for container operation handlers.

Index

• Variables
• func ClearContainerHandlerFactories()
• func DebugInfo() map[string][]string
• func HasFactories() bool
• func InitializeFSContext(context *fs.Context) error
• func InitializePlugins(factory info.MachineInfoFactory, fsInfo fs.FsInfo, includedMetrics MetricSet) []watcher.ContainerWatcher
• func RegisterContainerHandlerFactory(factory ContainerHandlerFactory, watchTypes []watcher.ContainerWatchSource)
• func RegisterPlugin(name string, plugin Plugin) error
• type ContainerHandler
  • func NewContainerHandler(name string, watchType watcher.ContainerWatchSource, ...) (ContainerHandler, bool, error)
• type ContainerHandlerFactory
  • func GetReorderedFactoryList(watchType watcher.ContainerWatchSource) []ContainerHandlerFactory
• type ContainerType
• type ListType
• type MetricKind
  • func (mk MetricKind) String() string
• type MetricSet
  • func (ms MetricSet) Append(ms1 MetricSet) MetricSet
  • func (ms MetricSet) Difference(ms1 MetricSet) MetricSet
  • func (ms MetricSet) Has(mk MetricKind) bool
  • func (ms *MetricSet) Set(value string) error
  • func (ms MetricSet) String() string
• type Plugin

Variables

var AllMetrics = MetricSet{
	CpuUsageMetrics:                struct{}{},
	ProcessSchedulerMetrics:        struct{}{},
	PerCpuUsageMetrics:             struct{}{},
	MemoryUsageMetrics:             struct{}{},
	MemoryNumaMetrics:              struct{}{},
	CpuLoadMetrics:                 struct{}{},
	DiskIOMetrics:                  struct{}{},
	DiskUsageMetrics:               struct{}{},
	NetworkUsageMetrics:            struct{}{},
	NetworkTcpUsageMetrics:         struct{}{},
	NetworkAdvancedTcpUsageMetrics: struct{}{},
	NetworkUdpUsageMetrics:         struct{}{},
	ProcessMetrics:                 struct{}{},
	AppMetrics:                     struct{}{},
	HugetlbUsageMetrics:            struct{}{},
	PerfMetrics:                    struct{}{},
	ReferencedMemoryMetrics:        struct{}{},
	CPUTopologyMetrics:             struct{}{},
	ResctrlMetrics:                 struct{}{},
	CPUSetMetrics:                  struct{}{},
	OOMMetrics:                     struct{}{},
}

AllMetrics represents all kinds of metrics that cAdvisor supported.

Functions

func ClearContainerHandlerFactories

func ClearContainerHandlerFactories()

Clear the known factories.

func DebugInfo

func DebugInfo() map[string][]string

func HasFactories

func HasFactories() bool

Returns whether there are any container handler factories registered.

func InitializeFSContext

func InitializeFSContext(context *fs.Context) error

func InitializePlugins

func InitializePlugins(factory info.MachineInfoFactory, fsInfo fs.FsInfo, includedMetrics MetricSet) []watcher.ContainerWatcher

func RegisterContainerHandlerFactory

func RegisterContainerHandlerFactory(factory ContainerHandlerFactory, watchTypes []watcher.ContainerWatchSource)

Register a ContainerHandlerFactory. These should be registered from least general to most general as they will be asked in order whether they can handle a particular container.

func RegisterPlugin

func RegisterPlugin(name string, plugin Plugin) error

Types

type ContainerHandler

type ContainerHandler interface {
	// Returns the ContainerReference
	ContainerReference() (info.ContainerReference, error)

	// Returns container's isolation spec.
	GetSpec() (info.ContainerSpec, error)

	// Returns the current stats values of the container.
	GetStats() (*info.ContainerStats, error)

	// Returns the subcontainers of this container.
	ListContainers(listType ListType) ([]info.ContainerReference, error)

	// Returns the processes inside this container.
	ListProcesses(listType ListType) ([]int, error)

	// Returns absolute cgroup path for the requested resource.
	GetCgroupPath(resource string) (string, error)

	// Returns container labels, if available.
	GetContainerLabels() map[string]string

	// Returns the container's ip address, if available
	GetContainerIPAddress() string

	// Returns whether the container still exists.
	Exists() bool

	// Cleanup frees up any resources being held like fds or go routines, etc.
	Cleanup()

	// Start starts any necessary background goroutines - must be cleaned up in Cleanup().
	// It is expected that most implementations will be a no-op.
	Start()

	// Type of handler
	Type() ContainerType
}

Interface for container operation handlers.

func NewContainerHandler

func NewContainerHandler(name string, watchType watcher.ContainerWatchSource, metadataEnvAllowList []string, inHostNamespace bool) (ContainerHandler, bool, error)

Create a new ContainerHandler for the specified container.

type ContainerHandlerFactory

type ContainerHandlerFactory interface {
	// Create a new ContainerHandler using this factory. CanHandleAndAccept() must have returned true.
	NewContainerHandler(name string, metadataEnvAllowList []string, inHostNamespace bool) (c ContainerHandler, err error)

	// Returns whether this factory can handle and accept the specified container.
	CanHandleAndAccept(name string) (handle bool, accept bool, err error)

	// Name of the factory.
	String() string

	// Returns debugging information. Map of lines per category.
	DebugInfo() map[string][]string
}

func GetReorderedFactoryList

func GetReorderedFactoryList(watchType watcher.ContainerWatchSource) []ContainerHandlerFactory

GetReorderedFactoryList returns the list of ContainerHandlerFactory where the RawContainerHandler is always the last element.

type ContainerType

type ContainerType int

const (
	ContainerTypeRaw ContainerType = iota
	ContainerTypeDocker
	ContainerTypeCrio
	ContainerTypeContainerd
	ContainerTypeMesos
)

type ListType

type ListType int

ListType describes whether listing should be just for a specific container or performed recursively.

const (
	ListSelf ListType = iota
	ListRecursive
)

type MetricKind

type MetricKind string

MetricKind represents the kind of metrics that cAdvisor exposes.

const (
	CpuUsageMetrics                MetricKind = "cpu"
	ProcessSchedulerMetrics        MetricKind = "sched"
	PerCpuUsageMetrics             MetricKind = "percpu"
	MemoryUsageMetrics             MetricKind = "memory"
	MemoryNumaMetrics              MetricKind = "memory_numa"
	CpuLoadMetrics                 MetricKind = "cpuLoad"
	DiskIOMetrics                  MetricKind = "diskIO"
	DiskUsageMetrics               MetricKind = "disk"
	NetworkUsageMetrics            MetricKind = "network"
	NetworkTcpUsageMetrics         MetricKind = "tcp"
	NetworkAdvancedTcpUsageMetrics MetricKind = "advtcp"
	NetworkUdpUsageMetrics         MetricKind = "udp"
	AppMetrics                     MetricKind = "app"
	ProcessMetrics                 MetricKind = "process"
	HugetlbUsageMetrics            MetricKind = "hugetlb"
	PerfMetrics                    MetricKind = "perf_event"
	ReferencedMemoryMetrics        MetricKind = "referenced_memory"
	CPUTopologyMetrics             MetricKind = "cpu_topology"
	ResctrlMetrics                 MetricKind = "resctrl"
	CPUSetMetrics                  MetricKind = "cpuset"
	OOMMetrics                     MetricKind = "oom_event"
)

func (MetricKind) String

func (mk MetricKind) String() string

type MetricSet

type MetricSet map[MetricKind]struct{}

func (MetricSet) Append

func (ms MetricSet) Append(ms1 MetricSet) MetricSet

func (MetricSet) Difference

func (ms MetricSet) Difference(ms1 MetricSet) MetricSet

func (MetricSet) Has

func (ms MetricSet) Has(mk MetricKind) bool

func (*MetricSet) Set

func (ms *MetricSet) Set(value string) error

Not thread-safe, exported only for https://pkg.go.dev/flag#Value

func (MetricSet) String

func (ms MetricSet) String() string

type Plugin

type Plugin interface {
	// InitializeFSContext is invoked when populating an fs.Context object for a new manager.
	// A returned error here is fatal.
	InitializeFSContext(context *fs.Context) error

	// Register is invoked when starting a manager. It can optionally return a container watcher.
	// A returned error is logged, but is not fatal.
	Register(factory info.MachineInfoFactory, fsInfo fs.FsInfo, includedMetrics MetricSet) (watcher.ContainerWatcher, error)
}