nri

Documentation

Index

• func RegisterDomain(d Domain)
• type API
  • func New(cfg *Config) (API, error)
• type Config
  • func DefaultConfig() *Config
  • func (c *Config) ConfigureTimeouts()
• type Container
• type Domain
• type LinuxContainer
• type LinuxPodSandbox
• type PodSandbox
• type State

Functions

func RegisterDomain

func RegisterDomain(d Domain)

RegisterDomain registers an NRI domain for a containerd namespace.

Types

type API

type API interface {
	// IsEnabled returns true if the NRI interface is enabled and initialized.
	IsEnabled() bool

	// Start starts the NRI interface, allowing external NRI plugins to
	// connect, register, and hook themselves into the lifecycle events
	// of pods and containers.
	Start() error

	// Stop stops the NRI interface.
	Stop()

	// RunPodSandbox relays pod creation events to NRI.
	RunPodSandbox(context.Context, PodSandbox) error

	// StopPodSandbox relays pod shutdown events to NRI.
	StopPodSandbox(context.Context, PodSandbox) error

	// RemovePodSandbox relays pod removal events to NRI.
	RemovePodSandbox(context.Context, PodSandbox) error

	// CreateContainer relays container creation requests to NRI.
	CreateContainer(context.Context, PodSandbox, Container) (*nri.ContainerAdjustment, error)

	// PostCreateContainer relays successful container creation events to NRI.
	PostCreateContainer(context.Context, PodSandbox, Container) error

	// StartContainer relays container start request notifications to NRI.
	StartContainer(context.Context, PodSandbox, Container) error

	// PostStartContainer relays successful container startup events to NRI.
	PostStartContainer(context.Context, PodSandbox, Container) error

	// UpdateContainer relays container update requests to NRI.
	UpdateContainer(context.Context, PodSandbox, Container, *nri.LinuxResources) (*nri.LinuxResources, error)

	// PostUpdateContainer relays successful container update events to NRI.
	PostUpdateContainer(context.Context, PodSandbox, Container) error

	// StopContainer relays container stop requests to NRI.
	StopContainer(context.Context, PodSandbox, Container) error

	// NotifyContainerExit handles the exit event of a container.
	NotifyContainerExit(context.Context, PodSandbox, Container)

	// StopContainer relays container removal events to NRI.
	RemoveContainer(context.Context, PodSandbox, Container) error
}

API implements a common API for interfacing NRI from containerd. It is agnostic to any internal containerd implementation details of pods and containers. It needs corresponding Domain interfaces for each containerd namespace it needs to handle. These domains take care of the namespace- specific details of providing pod and container metadata to NRI and of applying NRI-requested adjustments to the state of containers.

func New

func New(cfg *Config) (API, error)

New creates an instance of the NRI interface with the given configuration.

type Config

type Config struct {
	// Disable this NRI plugin and containerd NRI functionality altogether.
	Disable bool `toml:"disable" json:"disable"`
	// SocketPath is the path to the NRI socket to create for NRI plugins to connect to.
	SocketPath string `toml:"socket_path" json:"socketPath"`
	// PluginPath is the path to search for NRI plugins to launch on startup.
	PluginPath string `toml:"plugin_path" json:"pluginPath"`
	// PluginConfigPath is the path to search for plugin-specific configuration.
	PluginConfigPath string `toml:"plugin_config_path" json:"pluginConfigPath"`
	// PluginRegistrationTimeout is the timeout for plugin registration.
	PluginRegistrationTimeout time.Duration `toml:"plugin_registration_timeout" json:"pluginRegistrationTimeout"`
	// PluginRequestTimeout is the timeout for a plugin to handle a request.
	PluginRequestTimeout time.Duration `toml:"plugin_request_timeout" json:"pluginRequestTimeout"`
	// DisableConnections disables connections from externally launched plugins.
	DisableConnections bool `toml:"disable_connections" json:"disableConnections"`
}

Config data for NRI.

func DefaultConfig

func DefaultConfig() *Config

DefaultConfig returns the default configuration.

func (*Config) ConfigureTimeouts

func (c *Config) ConfigureTimeouts()

ConfigureTimeouts sets timeout options for NRI.

type Container

type Container interface {
	GetDomain() string

	GetPodSandboxID() string
	GetID() string
	GetName() string
	GetState() nri.ContainerState
	GetLabels() map[string]string
	GetAnnotations() map[string]string
	GetArgs() []string
	GetEnv() []string
	GetMounts() []*nri.Mount
	GetHooks() *nri.Hooks
	GetLinuxContainer() LinuxContainer

	GetPid() uint32
}

Container interface for interacting with NRI.

type Domain

type Domain interface {
	// GetName() returns the containerd namespace for this domain.
	GetName() string

	// ListPodSandboxes list all pods in this namespace.
	ListPodSandboxes() []PodSandbox

	// ListContainer list all containers in this namespace.
	ListContainers() []Container

	// GetPodSandbox returns the pod for the given ID.
	GetPodSandbox(string) (PodSandbox, bool)

	// GetContainer returns the container for the given ID.
	GetContainer(string) (Container, bool)

	// UpdateContainer applies an NRI container update request in the namespace.
	UpdateContainer(context.Context, *nri.ContainerUpdate) error

	// EvictContainer evicts the requested container in the namespace.
	EvictContainer(context.Context, *nri.ContainerEviction) error
}

Domain implements the functions the generic NRI interface needs to deal with pods and containers from a particular containerd namespace.

type LinuxContainer

type LinuxContainer interface {
	GetLinuxNamespaces() []*nri.LinuxNamespace
	GetLinuxDevices() []*nri.LinuxDevice
	GetLinuxResources() *nri.LinuxResources
	GetOOMScoreAdj() *int
	GetCgroupsPath() string
}

type LinuxPodSandbox

type LinuxPodSandbox interface {
	GetLinuxNamespaces() []*nri.LinuxNamespace
	GetPodLinuxOverhead() *nri.LinuxResources
	GetPodLinuxResources() *nri.LinuxResources
	GetCgroupParent() string
	GetCgroupsPath() string
	GetLinuxResources() *nri.LinuxResources
}

type PodSandbox

type PodSandbox interface {
	GetDomain() string

	GetID() string
	GetName() string
	GetUID() string
	GetNamespace() string
	GetLabels() map[string]string
	GetAnnotations() map[string]string
	GetRuntimeHandler() string
	GetLinuxPodSandbox() LinuxPodSandbox

	GetPid() uint32
}

PodSandbox interface for interacting with NRI.

type State

type State int

const (
	Created State = iota + 1
	Running
	Stopped
	Removed
)