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0. 数据流
路径： pkg/kubelet/kubelet.go
Run函数（） ->
syncNodeStatus () ->
registerWithAPIServer() ->
initialNode() ->
setNodeStatus ->
调用的setNodeStatusFuncs函数列表
1. NewMainKubelet函数
注册函数defaultNodeStatusFuncs
// Generating the status funcs should be the last thing we do,
// since this relies on the rest of the Kubelet having been constructed.
klet.setNodeStatusFuncs = klet.defaultNodeStatusFuncs()2. defaultNodeStatusFuncs函数
添加了一大堆函数（func(*v1.node) error）列表
// defaultNodeStatusFuncs is a factory that generates the default set of
// setNodeStatus funcs
func (kl *Kubelet) defaultNodeStatusFuncs() []func(*v1.Node) error {
// if cloud is not nil, we expect the cloud resource sync manager to exist
var nodeAddressesFunc func() ([]v1.NodeAddress, error)
if kl.cloud != nil {
nodeAddressesFunc = kl.cloudResourceSyncManager.NodeAddresses
}
var validateHostFunc func() error
if kl.appArmorValidator != nil {
validateHostFunc = kl.appArmorValidator.ValidateHost
}
var setters []func(n *v1.Node) error
setters = append(setters,
nodestatus.NodeAddress(kl.nodeIP, kl.nodeIPValidator, kl.hostname, kl.hostnameOverridden, kl.externalCloudProvider, kl.cloud, nodeAddressesFunc),
nodestatus.MachineInfo(string(kl.nodeName), kl.maxPods, kl.podsPerCore, kl.GetCachedMachineInfo, kl.containerManager.GetCapacity,
kl.containerManager.GetDevicePluginResourceCapacity, kl.containerManager.GetNodeAllocatableReservation, kl.recordEvent),
nodestatus.VersionInfo(kl.cadvisor.VersionInfo, kl.containerRuntime.Type, kl.containerRuntime.Version),
nodestatus.DaemonEndpoints(kl.daemonEndpoints),
nodestatus.Images(kl.nodeStatusMaxImages, kl.imageManager.GetImageList),
nodestatus.GoRuntime(),
)
if utilfeature.DefaultFeatureGate.Enabled(features.AttachVolumeLimit) {
setters = append(setters, nodestatus.VolumeLimits(kl.volumePluginMgr.ListVolumePluginWithLimits))
}
setters = append(setters,
nodestatus.OutOfDiskCondition(kl.clock.Now, kl.recordNodeStatusEvent),
nodestatus.MemoryPressureCondition(kl.clock.Now, kl.evictionManager.IsUnderMemoryPressure, kl.recordNodeStatusEvent),
nodestatus.DiskPressureCondition(kl.clock.Now, kl.evictionManager.IsUnderDiskPressure, kl.recordNodeStatusEvent),
nodestatus.PIDPressureCondition(kl.clock.Now, kl.evictionManager.IsUnderPIDPressure, kl.recordNodeStatusEvent),
nodestatus.ReadyCondition(kl.clock.Now, kl.runtimeState.runtimeErrors, kl.runtimeState.networkErrors, validateHostFunc, kl.containerManager.Status, kl.recordNodeStatusEvent),
nodestatus.VolumesInUse(kl.volumeManager.ReconcilerStatesHasBeenSynced, kl.volumeManager.GetVolumesInUse),
// TODO(mtaufen): I decided not to move this setter for now, since all it does is send an event
// and record state back to the Kubelet runtime object. In the future, I'd like to isolate
// these side-effects by decoupling the decisions to send events and partial status recording
// from the Node setters.
kl.recordNodeSchedulableEvent,
)
return setters
}3. NodeAddress函数
node.Status.Addresses = []v1.NodeAddress{
{Type: v1.NodeInternalIP, Address: ipAddr.String()},
{Type: v1.NodeHostName, Address: hostname},
}例如
status:
addresses:
- address: 10.12.51.209
type: InternalIP
- address: 10.12.51.209
type: Hostname4. DiskPressureCondition函数
主要是调用pressureFunc函数（IsUnderDiskPressure），主要匹配DiskPressure
func DiskPressureCondition(nowFunc func() time.Time, // typically Kubelet.clock.Now
pressureFunc func() bool, // typically Kubelet.evictionManager.IsUnderDiskPressure
recordEventFunc func(eventType, event string), // typically Kubelet.recordNodeStatusEvent
) Setter {
return func(node *v1.Node) error {
currentTime := metav1.NewTime(nowFunc())
var condition *v1.NodeCondition
// Check if NodeDiskPressure condition already exists and if it does, just pick it up for update.
for i := range node.Status.Conditions {
if node.Status.Conditions[i].Type == v1.NodeDiskPressure {
condition = &node.Status.Conditions[i]
}
}
newCondition := false
// If the NodeDiskPressure condition doesn't exist, create one
if condition == nil {
condition = &v1.NodeCondition{
Type: v1.NodeDiskPressure,
Status: v1.ConditionUnknown,
}
// cannot be appended to node.Status.Conditions here because it gets
// copied to the slice. So if we append to the slice here none of the
// updates we make below are reflected in the slice.
newCondition = true
}
// Update the heartbeat time
condition.LastHeartbeatTime = currentTime
// Note: The conditions below take care of the case when a new NodeDiskPressure condition is
// created and as well as the case when the condition already exists. When a new condition
// is created its status is set to v1.ConditionUnknown which matches either
// condition.Status != v1.ConditionTrue or
// condition.Status != v1.ConditionFalse in the conditions below depending on whether
// the kubelet is under disk pressure or not.
if pressureFunc() {
if condition.Status != v1.ConditionTrue {
condition.Status = v1.ConditionTrue
condition.Reason = "KubeletHasDiskPressure"
condition.Message = "kubelet has disk pressure"
condition.LastTransitionTime = currentTime
recordEventFunc(v1.EventTypeNormal, "NodeHasDiskPressure")
}
} else if condition.Status != v1.ConditionFalse {
condition.Status = v1.ConditionFalse
condition.Reason = "KubeletHasNoDiskPressure"
condition.Message = "kubelet has no disk pressure"
condition.LastTransitionTime = currentTime
recordEventFunc(v1.EventTypeNormal, "NodeHasNoDiskPressure")
}
if newCondition {
node.Status.Conditions = append(node.Status.Conditions, *condition)
}
return nil
}
}例如：
conditions:
- lastHeartbeatTime: 2018-10-16T02:10:03Z
lastTransitionTime: 2018-08-29T03:03:57Z
message: kubelet has sufficient disk space available
reason: KubeletHasSufficientDisk
status: "False"
type: OutOfDisk
- lastHeartbeatTime: 2018-10-16T02:10:03Z
lastTransitionTime: 2018-10-15T10:32:09Z
message: kubelet has sufficient memory available
reason: KubeletHasSufficientMemory
status: "False"
type: MemoryPressure
- lastHeartbeatTime: 2018-10-16T02:10:03Z
lastTransitionTime: 2018-10-15T19:40:44Z
message: kubelet has no disk pressure
reason: KubeletHasNoDiskPressure
status: "False"
type: DiskPressure
- lastHeartbeatTime: 2018-10-16T02:10:03Z
lastTransitionTime: 2018-10-15T10:32:09Z
message: kubelet is posting ready status
reason: KubeletReady
status: "True"
type: Ready