kubelet

package
v1.3.0-rancher3 Latest Latest
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 Go to latest Published: Jul 23, 2016 License: Apache-2.0 Imports: 92 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 (

	// max backoff period, exported for the e2e test
	MaxContainerBackOff = 300 * time.Second

	// Period for performing container garbage collection.
	ContainerGCPeriod = time.Minute
	// Period for performing image garbage collection.
	ImageGCPeriod = 5 * time.Minute
)

Variables

This section is empty.

Functions

func GetPhase added in v0.20.0 

func GetPhase(spec *api.PodSpec, info []api.ContainerStatus) api.PodPhase

GetPhase returns the phase of a pod given its container info. This func is exported to simplify integration with 3rd party kubelet integrations like kubernetes-mesos.

func NewInitializedVolumePluginMgr added in v1.3.0 

func NewInitializedVolumePluginMgr(
	kubelet *Kubelet,
	plugins []volume.VolumePlugin) (*volume.VolumePluginMgr, error)

NewInitializedVolumePluginMgr returns a new instance of volume.VolumePluginMgr initialized with kubelets implementation of the volume.VolumeHost interface.

kubelet - used by VolumeHost methods to expose kubelet specific parameters plugins - used to initialize volumePluginMgr

Types

type DiskSpacePolicy added in v0.18.0 

type DiskSpacePolicy struct {
	// free disk space threshold for filesystem holding docker images.
	DockerFreeDiskMB int
	// free disk space threshold for root filesystem. Host volumes are created on root fs.
	RootFreeDiskMB int
}

type FlannelHelper added in v1.2.0 

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

A Kubelet to flannel bridging helper.

func NewFlannelHelper added in v1.2.0 

func NewFlannelHelper() *FlannelHelper

NewFlannelHelper creates a new flannel helper.

func (*FlannelHelper) Handshake added in v1.2.0 

func (f *FlannelHelper) Handshake() (podCIDR string, err error)

Handshake waits for the flannel subnet file and installs a few IPTables rules, returning the pod CIDR allocated for this node.

type ImageGCPolicy added in v0.14.0 

type ImageGCPolicy struct {
	// Any usage above this threshold will always trigger garbage collection.
	// This is the highest usage we will allow.
	HighThresholdPercent int

	// Any usage below this threshold will never trigger garbage collection.
	// This is the lowest threshold we will try to garbage collect to.
	LowThresholdPercent int

	// Minimum age at which a image can be garbage collected.
	MinAge time.Duration
}

A policy for garbage collecting images. Policy defines an allowed band in which garbage collection will be run.

type KillPodOptions added in v1.3.0 

type KillPodOptions struct {
	// PodStatusFunc is the function to invoke to set pod status in response to a kill request.
	PodStatusFunc PodStatusFunc
	// PodTerminationGracePeriodSecondsOverride is optional override to use if a pod is being killed as part of kill operation.
	PodTerminationGracePeriodSecondsOverride *int64
}

KillPodOptions are options when performing a pod update whose update type is kill.

type Kubelet 

type Kubelet struct {

	// TODO: think about moving this to be centralized in PodWorkers in follow-on.
	// the list of handlers to call during pod admission.
	lifecycle.PodAdmitHandlers

	// the list of handlers to call during pod sync loop.
	lifecycle.PodSyncLoopHandlers

	// the list of handlers to call during pod sync.
	lifecycle.PodSyncHandlers
	// contains filtered or unexported fields
}

Kubelet is the main kubelet implementation.

func NewMainKubelet 

func NewMainKubelet(
	hostname string,
	nodeName string,
	dockerClient dockertools.DockerInterface,
	kubeClient clientset.Interface,
	rootDirectory string,
	seccompProfileRoot string,
	podInfraContainerImage string,
	resyncInterval time.Duration,
	pullQPS float32,
	pullBurst int,
	eventQPS float32,
	eventBurst int,
	containerGCPolicy kubecontainer.ContainerGCPolicy,
	sourcesReadyFn config.SourcesReadyFn,
	registerNode bool,
	registerSchedulable bool,
	standaloneMode bool,
	clusterDomain string,
	clusterDNS net.IP,
	masterServiceNamespace string,
	volumePlugins []volume.VolumePlugin,
	networkPlugins []network.NetworkPlugin,
	networkPluginName string,
	streamingConnectionIdleTimeout time.Duration,
	recorder record.EventRecorder,
	cadvisorInterface cadvisor.Interface,
	imageGCPolicy ImageGCPolicy,
	diskSpacePolicy DiskSpacePolicy,
	cloud cloudprovider.Interface,
	autoDetectCloudProvider bool,
	nodeLabels map[string]string,
	nodeStatusUpdateFrequency time.Duration,
	osInterface kubecontainer.OSInterface,
	cgroupRoot string,
	containerRuntime string,
	runtimeRequestTimeout time.Duration,
	rktPath string,
	rktAPIEndpoint string,
	rktStage1Image string,
	mounter mount.Interface,
	writer kubeio.Writer,
	configureCBR0 bool,
	nonMasqueradeCIDR string,
	podCIDR string,
	reconcileCIDR bool,
	maxPods int,
	podsPerCore int,
	nvidiaGPUs int,
	dockerExecHandler dockertools.ExecHandler,
	resolverConfig string,
	cpuCFSQuota bool,
	daemonEndpoints *api.NodeDaemonEndpoints,
	oomAdjuster *oom.OOMAdjuster,
	serializeImagePulls bool,
	containerManager cm.ContainerManager,
	outOfDiskTransitionFrequency time.Duration,
	flannelExperimentalOverlay bool,
	nodeIP net.IP,
	reservation kubetypes.Reservation,
	enableCustomMetrics bool,
	volumeStatsAggPeriod time.Duration,
	containerRuntimeOptions []kubecontainer.Option,
	hairpinMode string,
	babysitDaemons bool,
	evictionConfig eviction.Config,
	kubeOptions []Option,
	enableControllerAttachDetach bool,
) (*Kubelet, error)

NewMainKubelet instantiates a new Kubelet object along with all the required internal modules. No initialization of Kubelet and its modules should happen here.

func (*Kubelet) AttachContainer added in v1.1.0 

func (kl *Kubelet) AttachContainer(podFullName string, podUID types.UID, containerName string, stdin io.Reader, stdout, stderr io.WriteCloser, tty bool) error

AttachContainer uses the container runtime to attach the given streams to the given container.

func (*Kubelet) BirthCry added in v0.5.1 

func (kl *Kubelet) BirthCry()

BirthCry sends an event that the kubelet has started up.

func (*Kubelet) ExecInContainer added in v0.12.0 

func (kl *Kubelet) ExecInContainer(podFullName string, podUID types.UID, containerName string, cmd []string, stdin io.Reader, stdout, stderr io.WriteCloser, tty bool) error

ExecInContainer executes a command in a container, connecting the supplied stdin/stdout/stderr to the command's IO streams.

func (*Kubelet) GeneratePodHostNameAndDomain added in v1.3.0 

func (kl *Kubelet) GeneratePodHostNameAndDomain(pod *api.Pod) (string, string, error)

func (*Kubelet) GenerateRunContainerOptions added in v0.16.0 

func (kl *Kubelet) GenerateRunContainerOptions(pod *api.Pod, container *api.Container, podIP string) (*kubecontainer.RunContainerOptions, error)

GenerateRunContainerOptions generates the RunContainerOptions, which can be used by the container runtime to set parameters for launching a container.

func (*Kubelet) GetCachedMachineInfo added in v0.14.0 

func (kl *Kubelet) GetCachedMachineInfo() (*cadvisorapi.MachineInfo, error)

GetCachedMachineInfo assumes that the machine info can't change without a reboot

func (*Kubelet) GetClusterDNS added in v1.2.0 

func (kl *Kubelet) GetClusterDNS(pod *api.Pod) ([]string, []string, error)

GetClusterDNS returns a list of the DNS servers and a list of the DNS search domains of the cluster.

func (*Kubelet) GetContainerInfo 

func (kl *Kubelet) GetContainerInfo(podFullName string, podUID types.UID, containerName string, req *cadvisorapi.ContainerInfoRequest) (*cadvisorapi.ContainerInfo, error)

GetContainerInfo returns stats (from Cadvisor) for a container.

func (*Kubelet) GetContainerInfoV2 added in v1.2.0 

func (kl *Kubelet) GetContainerInfoV2(name string, options cadvisorapiv2.RequestOptions) (map[string]cadvisorapiv2.ContainerInfo, error)

GetContainerInfoV2 returns stats (from Cadvisor) for containers.

func (*Kubelet) GetHostIP added in v0.14.0 

func (kl *Kubelet) GetHostIP() (net.IP, error)

Returns host IP or nil in case of error.

func (*Kubelet) GetHostname added in v0.12.0 

func (kl *Kubelet) GetHostname() string

GetHostname Returns the hostname as the kubelet sees it.

func (*Kubelet) GetKubeletContainerLogs 

func (kl *Kubelet) GetKubeletContainerLogs(podFullName, containerName string, logOptions *api.PodLogOptions, stdout, stderr io.Writer) error

GetKubeletContainerLogs returns logs from the container TODO: this method is returning logs of random container attempts, when it should be returning the most recent attempt or all of them.

func (*Kubelet) GetNode added in v0.14.0 

func (kl *Kubelet) GetNode() (*api.Node, error)

GetNode returns the node info for the configured node name of this Kubelet.

func (*Kubelet) GetNodeConfig added in v1.2.0 

func (kl *Kubelet) GetNodeConfig() cm.NodeConfig

GetNodeConfig returns the container manager node config.

func (*Kubelet) GetPodByFullName added in v0.12.0 

func (kl *Kubelet) GetPodByFullName(podFullName string) (*api.Pod, bool)

GetPodByFullName gets the pod with the given 'full' name, which incorporates the namespace as well as whether the pod was found.

func (*Kubelet) GetPodByName added in v0.9.0 

func (kl *Kubelet) GetPodByName(namespace, name string) (*api.Pod, bool)

GetPodByName provides the first pod that matches namespace and name, as well as whether the pod was found.

func (*Kubelet) GetPodDir added in v0.7.0 

func (kl *Kubelet) GetPodDir(podUID types.UID) string

GetPodDir returns the full path to the per-pod data directory for the specified pod. This directory may not exist if the pod does not exist.

func (*Kubelet) GetPods added in v0.13.1 

func (kl *Kubelet) GetPods() []*api.Pod

GetPods returns all pods bound to the kubelet and their spec, and the mirror pods.

func (*Kubelet) GetRawContainerInfo added in v0.16.0 

func (kl *Kubelet) GetRawContainerInfo(containerName string, req *cadvisorapi.ContainerInfoRequest, subcontainers bool) (map[string]*cadvisorapi.ContainerInfo, error)

Returns stats (from Cadvisor) for a non-Kubernetes container.

func (*Kubelet) GetRunningPods added in v0.21.0 

func (kl *Kubelet) GetRunningPods() ([]*api.Pod, error)

GetRunningPods returns all pods running on kubelet from looking at the container runtime cache. This function converts kubecontainer.Pod to api.Pod, so only the fields that exist in both kubecontainer.Pod and api.Pod are considered meaningful.

func (*Kubelet) GetRuntime added in v0.19.0 

func (kl *Kubelet) GetRuntime() kubecontainer.Runtime

GetRuntime returns the current Runtime implementation in use by the kubelet. This func is exported to simplify integration with third party kubelet extensions (e.g. kubernetes-mesos).

func (*Kubelet) HandlePodAdditions added in v1.1.0 

func (kl *Kubelet) HandlePodAdditions(pods []*api.Pod)

HandlePodAdditions is the callback in SyncHandler for pods being added from a config source.

func (*Kubelet) HandlePodCleanups added in v1.1.0 

func (kl *Kubelet) HandlePodCleanups() error

HandlePodCleanups performs a series of cleanup work, including terminating pod workers, killing unwanted pods, and removing orphaned volumes/pod directories. TODO(yujuhong): This function is executed by the main sync loop, so it should not contain any blocking calls. Re-examine the function and decide whether or not we should move it into a separte goroutine.

func (*Kubelet) HandlePodDeletions added in v1.1.0 

func (kl *Kubelet) HandlePodDeletions(pods []*api.Pod)

HandlePodDeletions is the callback in the SyncHandler interface for pods being deleted from a config source.

func (*Kubelet) HandlePodReconcile added in v1.2.0 

func (kl *Kubelet) HandlePodReconcile(pods []*api.Pod)

HandlePodReconcile is the callback in the SyncHandler interface for pods that should be reconciled.

func (*Kubelet) HandlePodSyncs added in v1.1.0 

func (kl *Kubelet) HandlePodSyncs(pods []*api.Pod)

HandlePodSyncs is the callback in the syncHandler interface for pods that should be dispatched to pod workers for sync.

func (*Kubelet) HandlePodUpdates added in v1.1.0 

func (kl *Kubelet) HandlePodUpdates(pods []*api.Pod)

HandlePodUpdates is the callback in the SyncHandler interface for pods being updated from a config source.

func (*Kubelet) ImagesFsInfo added in v1.3.0 

func (kl *Kubelet) ImagesFsInfo() (cadvisorapiv2.FsInfo, error)

ImagesFsInfo returns information about docker image fs usage from cadvisor.

func (*Kubelet) LatestLoopEntryTime added in v0.20.0 

func (kl *Kubelet) LatestLoopEntryTime() time.Time

LatestLoopEntryTime returns the last time in the sync loop monitor.

func (*Kubelet) ListVolumesForPod added in v1.2.0 

func (kl *Kubelet) ListVolumesForPod(podUID types.UID) (map[string]volume.Volume, bool)

ListVolumesForPod returns a map of the mounted volumes for the given pod. The key in the map is the OuterVolumeSpecName (i.e. pod.Spec.Volumes[x].Name)

func (*Kubelet) ListenAndServe added in v0.15.0 

func (kl *Kubelet) ListenAndServe(address net.IP, port uint, tlsOptions *server.TLSOptions, auth server.AuthInterface, enableDebuggingHandlers bool)

ListenAndServe runs the kubelet HTTP server.

func (*Kubelet) ListenAndServeReadOnly added in v0.15.0 

func (kl *Kubelet) ListenAndServeReadOnly(address net.IP, port uint)

ListenAndServeReadOnly runs the kubelet HTTP server in read-only mode.

func (*Kubelet) PLEGHealthCheck added in v1.2.0 

func (kl *Kubelet) PLEGHealthCheck() (bool, error)

PLEGHealthCheck returns whether the PLEG is healty.

func (*Kubelet) PortForward added in v0.12.0 

func (kl *Kubelet) PortForward(podFullName string, podUID types.UID, port uint16, stream io.ReadWriteCloser) error

PortForward connects to the pod's port and copies data between the port and the stream.

func (*Kubelet) ResyncInterval added in v0.20.0 

func (kl *Kubelet) ResyncInterval() time.Duration

ResyncInterval returns the interval used for periodic syncs.

func (*Kubelet) RootFsInfo added in v1.2.0 

func (kl *Kubelet) RootFsInfo() (cadvisorapiv2.FsInfo, error)

RootFsInfo returns info about the root fs from cadvisor.

func (*Kubelet) Run 

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

Run starts the kubelet reacting to config updates

func (*Kubelet) RunInContainer 

func (kl *Kubelet) RunInContainer(podFullName string, podUID types.UID, containerName 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 kubetypes.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) StartGarbageCollection added in v0.14.0 

func (kl *Kubelet) StartGarbageCollection()

Starts garbage collection threads.

func (*Kubelet) StreamingConnectionIdleTimeout added in v0.12.0 

func (kl *Kubelet) StreamingConnectionIdleTimeout() time.Duration

StreamingConnectionIdleTimeout returns the timeout for streaming connections to the HTTP server.

type OOMWatcher added in v0.17.0 

type OOMWatcher interface {
	Start(ref *api.ObjectReference) error
}

func NewOOMWatcher added in v0.17.0 

func NewOOMWatcher(cadvisor cadvisor.Interface, recorder record.EventRecorder) OOMWatcher

type OnCompleteFunc added in v1.3.0 

type OnCompleteFunc func(err error)

OnCompleteFunc is a function that is invoked when an operation completes. If err is non-nil, the operation did not complete successfully.

type Option added in v1.2.0 

type Option func(*Kubelet)

Option is a functional option type for Kubelet

func SetNodeStatus added in v1.2.0 

func SetNodeStatus(f func(*api.Node) error) Option

SetNodeStatus returns a functional Option that adds the given node status update handler to the Kubelet

type PodStatusFunc added in v1.3.0 

type PodStatusFunc func(pod *api.Pod, podStatus *kubecontainer.PodStatus) api.PodStatus

PodStatusFunc is a function that is invoked to generate a pod status.

type PodWorkers added in v0.17.0 

type PodWorkers interface {
	UpdatePod(options *UpdatePodOptions)
	ForgetNonExistingPodWorkers(desiredPods map[types.UID]empty)
	ForgetWorker(uid types.UID)
}

PodWorkers is an abstract interface for testability.

type ReasonCache added in v1.2.0 

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

ReasonCache stores the failure reason of the latest container start in a string, keyed by <pod_UID>_<container_name>. The goal is to propagate this reason to the container status. This endeavor is "best-effort" for two reasons:

  1. The cache is not persisted.
  2. We use an LRU cache to avoid extra garbage collection work. This means that some entries may be recycled before a pod has been deleted.

TODO(random-liu): Use more reliable cache which could collect garbage of failed pod. TODO(random-liu): Move reason cache to somewhere better.

func NewReasonCache added in v1.2.0 

func NewReasonCache() *ReasonCache

func (*ReasonCache) Get added in v1.2.0 

func (c *ReasonCache) Get(uid types.UID, name string) (error, string, bool)

Get gets error reason from the cache. The return values are error reason, error message and whether an error reason is found in the cache. If no error reason is found, empty string will be returned for error reason and error message.

func (*ReasonCache) Remove added in v1.2.0 

func (c *ReasonCache) Remove(uid types.UID, name string)

Remove removes error reason from the cache

func (*ReasonCache) Update added in v1.2.0 

func (c *ReasonCache) Update(uid types.UID, result kubecontainer.PodSyncResult)

Update updates the reason cache with the SyncPodResult. Only SyncResult with StartContainer action will change the cache.

type RunPodResult 

type RunPodResult struct {
	Pod *api.Pod
	Err error
}

type SyncHandler 

type SyncHandler interface {
	HandlePodAdditions(pods []*api.Pod)
	HandlePodUpdates(pods []*api.Pod)
	HandlePodDeletions(pods []*api.Pod)
	HandlePodReconcile(pods []*api.Pod)
	HandlePodSyncs(pods []*api.Pod)
	HandlePodCleanups() error
}

SyncHandler is an interface implemented by Kubelet, for testability

type UpdatePodOptions added in v1.3.0 

type UpdatePodOptions struct {
	// pod to update
	Pod *api.Pod
	// the mirror pod for the pod to update, if it is a static pod
	MirrorPod *api.Pod
	// the type of update (create, update, sync, kill)
	UpdateType kubetypes.SyncPodType
	// optional callback function when operation completes
	// this callback is not guaranteed to be completed since a pod worker may
	// drop update requests if it was fulfilling a previous request.  this is
	// only guaranteed to be invoked in response to a kill pod request which is
	// always delivered.
	OnCompleteFunc OnCompleteFunc
	// if update type is kill, use the specified options to kill the pod.
	KillPodOptions *KillPodOptions
}

UpdatePodOptions is an options struct to pass to a UpdatePod operation.

Source Files

View all Source files

Directories

Path Synopsis
api
v1alpha1/stats
Kubelet interactions with cAdvisor.
 Kubelet interactions with cAdvisor.
rancher
testing
Reads the pod configuration from the Kubernetes apiserver.
 Reads the pod configuration from the Kubernetes apiserver.
testing
Package custommetrics contains support for instrumenting cAdvisor to gather custom metrics from pods.
 Package custommetrics contains support for instrumenting cAdvisor to gather custom metrics from pods.
Package envvars is the package that build the environment variables that kubernetes provides to the containers run by it.
 Package envvars is the package that build the environment variables that kubernetes provides to the containers run by it.
Package eviction is responsible for enforcing eviction thresholds to maintain node stability.
 Package eviction is responsible for enforcing eviction thresholds to maintain node stability.
Package leaky holds bits of kubelet that should be internal but have leaked out through bad abstractions.
 Package leaky holds bits of kubelet that should be internal but have leaked out through bad abstractions.
Handlers for pod lifecycle events and interfaces to integrate with kubelet admission, synchronization, and eviction of pods.
 Handlers for pod lifecycle events and interfaces to integrate with kubelet admission, synchronization, and eviction of pods.
cni
cni/testing
mock_cni is a mock of the `libcni.CNI` interface.
 mock_cni is a mock of the `libcni.CNI` interface.
exec
Package exec scans and loads networking plugins that are installed under /usr/libexec/kubernetes/kubelet-plugins/net/exec/ The layout convention for a plugin is: plugin-name/ (plugins have to be directories first) plugin-name/plugin-name (executable that will be called out, see Vendoring Note for more nuances) plugin-name/<other-files> where, 'executable' has the following requirements: - should have exec permissions - should give non-zero exit code on failure, and zero on success - the arguments will be <action> <pod_namespace> <pod_name> <docker_id_of_infra_container> whereupon, <action> will be one of: - init, called when the kubelet loads the plugin - setup, called after the infra container of a pod is created, but before other containers of the pod are created - teardown, called before the pod infra container is killed - status, called at regular intervals and is supposed to return a json formatted output indicating the pod's IPAddress(v4/v6).
 Package exec scans and loads networking plugins that are installed under /usr/libexec/kubernetes/kubelet-plugins/net/exec/ The layout convention for a plugin is: plugin-name/ (plugins have to be directories first) plugin-name/plugin-name (executable that will be called out, see Vendoring Note for more nuances) plugin-name/<other-files> where, 'executable' has the following requirements: - should have exec permissions - should give non-zero exit code on failure, and zero on success - the arguments will be <action> <pod_namespace> <pod_name> <docker_id_of_infra_container> whereupon, <action> will be one of: - init, called when the kubelet loads the plugin - setup, called after the infra container of a pod is created, but before other containers of the pod are created - teardown, called before the pod infra container is killed - status, called at regular intervals and is supposed to return a json formatted output indicating the pod's IPAddress(v4/v6).
hairpin
hostport
hostport/testing
kubenet
mock_network
testing
Package pleg contains types and a generic implementation of the pod lifecycle event generator.
 Package pleg contains types and a generic implementation of the pod lifecycle event generator.
pod
testing
results
testing
qos
package qos contains helper functions for quality of service.
 package qos contains helper functions for quality of service.
util
rkt
Package rkt contains the Containerruntime interface implementation for rkt.
 Package rkt contains the Containerruntime interface implementation for rkt.
mock_os
Package server contains functions related to serving Kubelet's external interface.
 Package server contains functions related to serving Kubelet's external interface.
portforward
package portforward contains server-side logic for handling port forwarding requests.
 package portforward contains server-side logic for handling port forwarding requests.
remotecommand
package remotecommand contains functions related to executing commands in and attaching to pods.
 package remotecommand contains functions related to executing commands in and attaching to pods.
stats
Package stats handles exporting Kubelet and container stats.
 Package stats handles exporting Kubelet and container stats.
Common types in the Kubelet.
 Common types in the Kubelet.
Utility functions.
 Utility functions.
cache
format
ioutils
queue
cache
Package cache implements data structures used by the kubelet volume manager to keep track of attached volumes and the pods that mounted them.
 Package cache implements data structures used by the kubelet volume manager to keep track of attached volumes and the pods that mounted them.
populator
Package populator implements interfaces that monitor and keep the states of the caches in sync with the "ground truth".
 Package populator implements interfaces that monitor and keep the states of the caches in sync with the "ground truth".
reconciler
Package reconciler implements interfaces that attempt to reconcile the desired state of the with the actual state of the world by triggering relevant actions (attach, detach, mount, unmount).
 Package reconciler implements interfaces that attempt to reconcile the desired state of the with the actual state of the world by triggering relevant actions (attach, detach, mount, unmount).

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