kubelet

package
v0.4.4 Latest Latest
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 Go to latest Published: Nov 19, 2014 License: Apache-2.0 Imports: 29 Imported by: 0

Documentation

Overview

Package kubelet is the package that contains the libraries that drive the Kubelet binary. The kubelet is responsible for node level pod management. It runs on each worker in the cluster.

Index

Constants

View Source 
const (
	RunOnceManifestDelay     = 1 * time.Second
	RunOnceMaxRetries        = 10
	RunOnceRetryDelay        = 1 * time.Second
	RunOnceRetryDelayBackoff = 2
)
View Source 
const (
	NetworkContainerImage = "kubernetes/pause:latest"
)

Variables

This section is empty.

Functions

func GetPodFullName 

func GetPodFullName(pod *Pod) string

GetPodFullName returns a name that full identifies a pod across all config sources.

func ListenAndServeKubeletServer 

func ListenAndServeKubeletServer(host HostInterface, updates chan<- interface{}, address net.IP, port uint, enableDebuggingHandlers bool)

ListenAndServeKubeletServer initializes a server to respond to HTTP network requests on the Kubelet.

func ResolvePort 

func ResolvePort(portReference util.IntOrString, container *api.Container) (int, error)

ResolvePort attempts to turn a IntOrString port reference into a concrete port number. If portReference has an int value, it is treated as a literal, and simply returns that value. If portReference is a string, an attempt is first made to parse it as an integer. If that fails, an attempt is made to find a port with the same name in the container spec. If a port with the same name is found, it's ContainerPort value is returned. If no matching port is found, an error is returned.

func ValidatePod 

func ValidatePod(pod *Pod) (errors []error)

Types

type ByCreated added in v0.4.2 

type ByCreated []*docker.Container

func (ByCreated) Len added in v0.4.2 

func (a ByCreated) Len() int

func (ByCreated) Less added in v0.4.2 

func (a ByCreated) Less(i, j int) bool

func (ByCreated) Swap added in v0.4.2 

func (a ByCreated) Swap(i, j int)

type CadvisorInterface 

type CadvisorInterface interface {
	ContainerInfo(name string, req *info.ContainerInfoRequest) (*info.ContainerInfo, error)
	MachineInfo() (*info.MachineInfo, error)
}

CadvisorInterface is an abstract interface for testability. It abstracts the interface of "github.com/google/cadvisor/client".Client.

type FlushWriter 

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

FlushWriter provides wrapper for responseWriter with HTTP streaming capabilities

func (*FlushWriter) Write 

func (fw *FlushWriter) Write(p []byte) (n int, err error)

Write is a FlushWriter implementation of the io.Writer that sends any buffered data to the client.

type HostInterface 

type HostInterface interface {
	GetContainerInfo(podFullName, uuid, containerName string, req *info.ContainerInfoRequest) (*info.ContainerInfo, error)
	GetRootInfo(req *info.ContainerInfoRequest) (*info.ContainerInfo, error)
	GetMachineInfo() (*info.MachineInfo, error)
	GetPodInfo(name, uuid string) (api.PodInfo, error)
	RunInContainer(name, uuid, container string, cmd []string) ([]byte, error)
	GetKubeletContainerLogs(podFullName, containerName, tail string, follow bool, stdout, stderr io.Writer) error
	ServeLogs(w http.ResponseWriter, req *http.Request)
}

HostInterface contains all the kubelet methods required by the server. For testablitiy.

type Kubelet 

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

Kubelet is the main kubelet implementation.

func NewIntegrationTestKubelet 

func NewIntegrationTestKubelet(hn string, rd string, dc dockertools.DockerInterface) *Kubelet

NewIntegrationTestKubelet creates a new Kubelet for use in integration tests. TODO: add more integration tests, and expand parameter list as needed.

func NewMainKubelet 

func NewMainKubelet(
	hn string,
	dc dockertools.DockerInterface,
	ec tools.EtcdClient,
	rd string,
	ni string,
	ri time.Duration,
	pullQPS float32,
	pullBurst int,
	minimumGCAge time.Duration,
	maxContainerCount int) *Kubelet

New creates a new Kubelet for use in main

func (*Kubelet) GarbageCollectContainers added in v0.4.2 

func (kl *Kubelet) GarbageCollectContainers() error

TODO: Also enforce a maximum total number of containers.

func (*Kubelet) GetCadvisorClient 

func (kl *Kubelet) GetCadvisorClient() CadvisorInterface

GetCadvisorClient gets the cadvisor client.

func (*Kubelet) GetContainerInfo 

func (kl *Kubelet) GetContainerInfo(podFullName, uuid, containerName string, req *info.ContainerInfoRequest) (*info.ContainerInfo, error)

GetContainerInfo returns stats (from Cadvisor) for a container.

func (*Kubelet) GetKubeletContainerLogs 

func (kl *Kubelet) GetKubeletContainerLogs(podFullName, containerName, tail string, follow bool, stdout, stderr io.Writer) error

GetKubeletContainerLogs returns logs from the container The second parameter of GetPodInfo and FindPodContainer methods represents pod UUID, which is allowed to be blank

func (*Kubelet) GetMachineInfo 

func (kl *Kubelet) GetMachineInfo() (*info.MachineInfo, error)

func (*Kubelet) GetPodInfo 

func (kl *Kubelet) GetPodInfo(podFullName, uuid string) (api.PodInfo, error)

GetPodInfo returns information from Docker about the containers in a pod

func (*Kubelet) GetRootInfo 

func (kl *Kubelet) GetRootInfo(req *info.ContainerInfoRequest) (*info.ContainerInfo, error)

GetRootInfo returns stats (from Cadvisor) of current machine (root container).

func (*Kubelet) LogEvent 

func (kl *Kubelet) LogEvent(event *api.Event) error

LogEvent reports an event.

func (*Kubelet) Run 

func (kl *Kubelet) Run(updates <-chan PodUpdate)

Run starts the kubelet reacting to config updates

func (*Kubelet) RunInContainer 

func (kl *Kubelet) RunInContainer(podFullName, uuid, container string, cmd []string) ([]byte, error)

Run a command in a container, returns the combined stdout, stderr as an array of bytes

func (*Kubelet) RunOnce 

func (kl *Kubelet) RunOnce(updates <-chan PodUpdate) ([]RunPodResult, error)

RunOnce polls from one configuration update and run the associated pods.

func (*Kubelet) ServeLogs 

func (kl *Kubelet) ServeLogs(w http.ResponseWriter, req *http.Request)

Returns logs of current machine.

func (*Kubelet) SetCadvisorClient 

func (kl *Kubelet) SetCadvisorClient(c CadvisorInterface)

SetCadvisorClient sets the cadvisor client in a thread-safe way.

func (*Kubelet) SyncPods 

func (kl *Kubelet) SyncPods(pods []Pod) error

SyncPods synchronizes the configured list of pods (desired state) with the host current state.

type Pod 

type Pod struct {
	Namespace string
	Name      string
	Manifest  api.ContainerManifest
}

Pod represents the structure of a pod on the Kubelet, distinct from the apiserver representation of a Pod.

type PodOperation 

type PodOperation int

PodOperation defines what changes will be made on a pod configuration. 

const (
	// This is the current pod configuration
	SET PodOperation = iota
	// Pods with the given ids are new to this source
	ADD
	// Pods with the given ids have been removed from this source
	REMOVE
	// Pods with the given ids have been updated in this source
	UPDATE
)

type PodUpdate 

type PodUpdate struct {
	Pods []Pod
	Op   PodOperation
}

PodUpdate defines an operation sent on the channel. You can add or remove single services by sending an array of size one and Op == ADD|REMOVE (with REMOVE, only the ID is required). For setting the state of the system to a given state for this source configuration, set Pods as desired and Op to SET, which will reset the system state to that specified in this operation for this source channel. To remove all pods, set Pods to empty array and Op to SET.

type RunPodResult 

type RunPodResult struct {
	Pod *Pod
	Err error
}

type Server 

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

Server is a http.Handler which exposes kubelet functionality over HTTP.

func NewServer 

func NewServer(host HostInterface, updates chan<- interface{}, enableDebuggingHandlers bool) Server

NewServer initializes and configures a kubelet.Server object to handle HTTP requests.

func (*Server) InstallDebuggingHandlers 

func (s *Server) InstallDebuggingHandlers()

InstallDeguggingHandlers registers the HTTP request patterns that serve logs or run commands/containers

func (*Server) InstallDefaultHandlers 

func (s *Server) InstallDefaultHandlers()

InstallDefaultHandlers registers the default set of supported HTTP request patterns with the mux.

func (*Server) ServeHTTP 

func (s *Server) ServeHTTP(w http.ResponseWriter, req *http.Request)

ServeHTTP responds to HTTP requests on the Kubelet.

type SyncHandler 

type SyncHandler interface {
	SyncPods([]Pod) error
}

SyncHandler is an interface implemented by Kubelet, for testability

Source Files

View all Source files

Directories

Path Synopsis
Package config implements the pod configuration readers.
 Package config implements the pod configuration readers.

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